Question 2: What is the material of the beverage bottle cap? The materials used are polyethylene (PE), polyvinyl chloride (PVC) and polyethylene terephthalate (PET). Usually mineral water bottles are made of PVC or PET, carbonated drinks bottles are made of PET, refreshing drinks bottles, liquid food bottles are made of PVC and PE, detergent bottles, cosmetics bottles, milk bottles and lactic acid bacteria drinks are mostly made of PE.
Generally, all kinds of recycling bottles are sorted manually first, and then recycled according to different materials. At present, many technologies and equipment have been used to recycle various bottles.
(1)PET bottle recycling. PET bottles are widely used in carbonated drinks such as Coca Cola, Pepsi Cola and Sprite. At present, most of them are composed of PET bottles and HDPE bottle bottoms. The bottle cap is made of HDPE, and the trademark is BOPP film, which is stuck on the bottle body with EVA glue. The method of recycling polyester bottles is regeneration granulation. Alcoholysis and other methods. No matter which method is adopted, the polyester bottle should be separated from other bottles first, and the polyester bottle body should also be separated from the bottom of the bottle.
(1) separation: the mixed additional bottles enter the crusher through the conveyor belt for crushing, and then the density is separated.
② Regenerative granulation: Regenerative granulation can be done by an extruder. The separated PET chips are extruded by an extruder and granulated to make pellets. In order to avoid physical viscosity reduction due to water absorption during extrusion, they should be dried before extrusion. The uses of PET particles are as follows:
A. remanufacture PET bottles. The recycled particles can not be used for direct contact with food, but can be used for the middle layer of a three-layer PET bottle and then made into carbonated beverage bottles.
B. spinning to make fibers. Regenerated PET materials can be used for spinning into fibers, and can be used as pillow cores, mattresses, sleeping bags, blankets, etc.
C. Glass fiber reinforced material, recycled PET reinforced by glass fiber has good heat resistance and mechanical strength, and can be used to manufacture automobile parts, such as heat-resistant automobile wheel covers, and its thermal deformation temperature can reach 240 degrees. The flexural modulus is 9500MPa, the flexural strength is 2 14 MPa and the impact strength is 15kf/m2.
D.*** Mixed modification: The recycled PET material can be mixed with other polymers * * * to make various modified materials, such as mixed with PE***, to obtain a PET*** mixture with improved impact performance, and the ratio of PE to PET is (10 ~ 50): (90 ~ 50): if a small amount of polypropylene is added. Due to the great polarity difference between PE and PET, compatibility treatment is needed when mixing. Generally, the compatibility is improved by grafting modification of polyolefin.
(3) alcoholysis: carrying out alcoholysis on the PET waste in the presence of an alkaline catalyst, and then adding dibasic anhydride for polycondensation to obtain a product with an acid value greater than 12. Alkyd resin paint can be prepared by diluting, filtering and adding proper amount of catalyst. See the table below for the formula. The reaction temperature is 80-85 DEG C and the reaction time is 4-5 hours.
Formulation of coating prepared by alcoholysis of polyester waste
Material addition/%Material addition/%
PET material 25 N- hydroxymethyl acrylamide 2
Triethylene glycol 23 nonionic emulsifier 0.9
Dibutyl phthalate 18 anionic emulsifier 1. 1
Vinyl acetate 24 persulfate initiator 1.4 ~ 1.6
α-methylstyrene 7 water 130
Methacrylic acid 1
Another example is that PET waste reacts with polyol at 220 ~ 250℃, and insulation paint with three-dimensional network structure is prepared by solvation. The quality meets the requirements of GB6 109. ③ In addition, PET bottles can also be used to make plasticizer: 2- ethylhexyl terephthalate (DOTP), which is similar to dioctyl phthalate (DOP) in terms of electrical properties and low-temperature flexibility. Waste PET bottles can also be made into adhesives and unsaturated polyester by methods similar to waste PET films.
(2) The charging process of PVC bottles and the recycling process of PVC are as follows.
PVC bottles are cleaned, sorted, crushed, crushed and recycled.
Firstly, the PVC bottles were cleaned with steam and alkali liquor and the trademarks were removed. Then the PVC bottles were sorted mechanically and manually, and the sorted PVC bottles were crushed for the second time. Finally, the powder recovery product with fineness of 500~ 1200μm was obtained, and the purity could reach 99.98%.
(3) extra charge for 3)PE bottles. PE used as bottle material is mainly HDPE, including dairy bottles, food bottles and cosmetic bottles. After sorting and cleaning, the recycled HDPE bottles can be crushed and selected, and their uses are as follows:
① Use colored cola bottle bottom.
(2) The intermediate core layer used for extruding pipes.
③ Fill talcum powder or glass fiber to make flower teacups ... >>
Question 3: What is the material of the beverage bottle? PET is used for carbonated beverage bottles, refreshing beverage bottles, PVC and PE for liquid food bottles, detergent bottles, cosmetic bottles, milk bottles, and PE for lactic acid bacteria drinks.
Question 4: What plastic is the beverage bottle? Look at the numbers in the circular triangle at the bottom of the bottle. Different numbers are made of different materials. 1: PET polyethylene terephthalate
Common mineral water bottles, carbonated beverage bottles, etc. Heat resistance to 70℃ is easy to deform, and substances harmful to human body are melted out. Plastic product 1 may release carcinogen DEHP after using 10 months. Can't put it in the car to bask in the sun; Don't pack alcohol, oil and other substances.
2: HDPE high density polyethylene
Common white medicine bottles, cleaning products, bath products. Don't use it as a cup, or as a storage container for other items. If the cleaning is not thorough, don't recycle it.
3: PVC PVC
Common raincoats, building materials, plastic films, plastic boxes, etc. Excellent plasticity and low price, so it is widely used, and can only resist heat of 865438 0℃. It is easy to produce harmful substances at high temperature and is rarely used in food packaging. It is difficult to clean, and it is easy to remain, so don't recycle it. Don't buy packaged drinks.
4: PE polyethylene
Common cling film, plastic film, etc. Harmful substances will be produced at high temperature, and toxic substances may cause diseases such as breast cancer and birth defects of newborns after entering the human body with food. Don't put plastic wrap in the microwave.
5: PP polypropylene
Common soybean milk bottles, sour milk bottles, fruit juice bottles, microwave lunch boxes. With a melting point as high as 167℃, it is the only plastic box that can be put into a microwave oven and can be reused after careful cleaning. It should be noted that some microwave lunch boxes are made of No.5 PP, but the cover is made of 1 PE. Because PE is not resistant to high temperature, it can't be put in the microwave oven with the box.
6: polystyrene
Common instant noodle boxes and fast food boxes in bowls. Can't put it in the microwave oven, so as not to release chemicals when the temperature is too high. After being filled with acid (such as orange juice) and alkaline substances, carcinogens will decompose. Avoid packing hot food in fast food boxes. Don't cook bowls of instant noodles in the microwave oven.
7: PC other classes
Common kettles, space cups and milk bottles. Department stores often use cups made of this material as gifts. It is easy to release bisphenol A, a toxic substance harmful to human body. Don't heat it when using it, and don't directly bask in the sun.
Question 5: What is the plastic bottle made of? Beverage bottles (such as Coca-Cola's) are mostly plastic products, mainly made of polyethylene or polypropylene, and various organic solvents are added. Polyethylene and polypropylene are nontoxic and tasteless, so it is safe for people to fill drinks. However, once polyethylene is corroded by high temperature or acid, it will slowly dissolve and release organic solvents, which is harmful to human body.
It has been reported that long-term consumption of food contaminated by polyethylene molecules will cause dizziness, headache, nausea, loss of appetite, memory loss and even anemia. Therefore, using vinegar in plastic bottles is harmful to human health. Therefore, glassware should be used instead of plastic products to hold spices and the like in the family. When using plastic products, we should pay special attention to avoid contact with vinegar, detergent, etc. And avoid direct sunlight and high temperature to avoid chemical reaction. In addition, when buying plastic tableware, you should choose plastic products with PE (polyethylene) or PP (polypropylene) labels, few decorative patterns, colorless and tasteless, and smooth surfaces.
There are many ways to make polyethylene, and the most common one is to polymerize ethylene at 200 ~ 300℃ and 1000 ~ 2000 atmospheric pressure. In polyethylene, no other substances are doped. The polyethylene prepared by this method has low density, soft texture and high stability to sunlight, air, moisture and chemical reagents, so there is no need to add stabilizers and plasticizers, which are mostly toxic or highly toxic.
About recycling:
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Your current position: China Plastics Industry Network >> Special Topics on Waste Plastics >> Knowledge of Recycling Plastics >> Recycling >> The date of this article is July 29th, 2008.
Tuesday
This paper introduces the concrete method of producing shoe last with recycled polyethylene plastic.
hot
This paper introduces the special arc method of producing shoe last with recycled polyethylene plastic.
Author: anonymous article source: unknown hits: 1263
Polyethylene (PE) can be described as high pressure polyethylene (LDPE) and low pressure polyethylene (HDPE), and some of them are mixed. The raw material of polyethylene is milky white, non-toxic, tasteless and waxy particles with shiny surface. Commonly used in packaging films, agricultural films, injection molded products, cable sheaths, blow molded products, packaging boxes, turnover boxes, etc. A polymer of ethylene and propylene, often used in food packaging or turnover boxes. Polymers of ethylene and butene are commonly used in the above raw materials, including degradable or non-degradable polyethylene, high-pressure polyethylene and compressed polyethylene. All colors can be mixed and used without decoloration. Firstly, the recycled waste polyethylene was cleaned, degreased and dried. If possible, it can be granulated by a granulator, otherwise it will be crushed or cut into pieces, and then added to the hopper of the injection molding machine. The temperature of injection molding machine should be: feeding section 150℃, middle section 170℃, and head 200℃. After heating, the polyethylene can be freely poured into the shoe last mold by the machine head, filled and put into water at 20-50℃ for cooling and setting for 2 hours. After cooling, it is demoulded into a plastic shoe last blank, and the blank is processed by imitating tin to obtain the finished shoe last.
Finally, the mold in shoemaking production. The color and composition of recycled polyethylene will not affect the quality of finished shoes. The recycled waste polyethylene can be used directly without adding any auxiliary materials. The cost of producing shoe last from waste polyethylene is the sum of the expenses of recycling polyethylene waste, cleaning, granulating, injecting last blank, tin last shape and other related expenses. The weight of each pair of shoe last is about 1.5-2kg, and the price of the finished shoe upper for men and women is 17- 19 yuan, which makes a considerable profit. There are 3,665 shoe-making enterprises in China, with an annual shoe last weight of about 5 million pairs, and the development prospect is very optimistic.
Using waste polyethylene to produce shoe last can replace wood last and reduce deforestation resources. Plastic shoe last can be recycled at a discount after use, and can be processed into a new shoe last for recycling after crushing, thus realizing the resource recycling of white pollution. Waste polyethylene can also be used to produce industrial material turnover boxes, packaging materials, agricultural fruit and vegetable turnover boxes and other products, which need further development and utilization.
The above information is for reference only, and offenders may not reprint it. This station reserves all rights.
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Literature/invention patent on polyethylene recovery/recycling and utilization ................................................................................................................................................................ >
Question 6: What are plastic bottles made of? More common are PET, PP, PE, PC, etc. PET bottles are transparent, non-toxic, impact-resistant and heat-resistant. Generally, it is filled with mineral water, cola, peanut oil and cosmetics. Must be cold-filled, disposable (do not sterilize at high temperature).
Question 7: What is the material for making beverage bottles? Common mineral water bottles and carbonated beverage bottles are made of PET polyethylene terephthalate. Heat resistance to 70℃ is easy to deform, and substances harmful to human body are melted out. Plastic product 1 may release carcinogen DEHP after using 10 months. Can't put it in the car to bask in the sun; Don't pack alcohol, oil and other substances.
Question 8: What is the material of the beverage bottle cap? The materials used are polyethylene (PE), polyvinyl chloride (PVC) and polyethylene terephthalate (PET). Usually mineral water bottles are made of PVC or PET, carbonated drinks bottles are made of PET, refreshing drinks bottles, liquid food bottles are made of PVC and PE, detergent bottles, cosmetics bottles, milk bottles and lactic acid bacteria drinks are mostly made of PE.
Generally, all kinds of recycling bottles are sorted manually first, and then recycled according to different materials. At present, many technologies and equipment have been used to recycle various bottles.
(1)PET bottle recycling. PET bottles are widely used in carbonated drinks such as Coca Cola, Pepsi Cola and Sprite. At present, most of them are composed of PET bottles and HDPE bottle bottoms. The bottle cap is made of HDPE, and the trademark is BOPP film, which is stuck on the bottle body with EVA glue. The method of recycling polyester bottles is regeneration granulation. Alcoholysis and other methods. No matter which method is adopted, the polyester bottle should be separated from other bottles first, and the polyester bottle body should also be separated from the bottom of the bottle.
(1) separation: the mixed additional bottles enter the crusher through the conveyor belt for crushing, and then the density is separated.
② Regenerative granulation: Regenerative granulation can be done by an extruder. The separated PET chips are extruded by an extruder and granulated to make pellets. In order to avoid physical viscosity reduction due to water absorption during extrusion, they should be dried before extrusion. The uses of PET particles are as follows:
A. remanufacture PET bottles. The recycled particles can not be used for direct contact with food, but can be used for the middle layer of a three-layer PET bottle and then made into carbonated beverage bottles.
B. spinning to make fibers. Regenerated PET materials can be used for spinning into fibers, and can be used as pillow cores, mattresses, sleeping bags, blankets, etc.
C. Glass fiber reinforced material, recycled PET reinforced by glass fiber has good heat resistance and mechanical strength, and can be used to manufacture automobile parts, such as heat-resistant automobile wheel covers, and its thermal deformation temperature can reach 240 degrees. The flexural modulus is 9500MPa, the flexural strength is 2 14 MPa and the impact strength is 15kf/m2.
D.*** Mixed modification: The recycled PET material can be mixed with other polymers * * * to make various modified materials, such as mixed with PE***, to obtain a PET*** mixture with improved impact performance, and the ratio of PE to PET is (10 ~ 50): (90 ~ 50): if a small amount of polypropylene is added. Due to the great polarity difference between PE and PET, compatibility treatment is needed when mixing. Generally, the compatibility is improved by grafting modification of polyolefin.
(3) alcoholysis: carrying out alcoholysis on the PET waste in the presence of an alkaline catalyst, and then adding dibasic anhydride for polycondensation to obtain a product with an acid value greater than 12. Alkyd resin paint can be prepared by diluting, filtering and adding proper amount of catalyst. See the table below for the formula. The reaction temperature is 80-85 DEG C and the reaction time is 4-5 hours.
Formulation of coating prepared by alcoholysis of polyester waste
Material addition/%Material addition/%
PET material 25 N- hydroxymethyl acrylamide 2
Triethylene glycol 23 nonionic emulsifier 0.9
Dibutyl phthalate 18 anionic emulsifier 1. 1
Vinyl acetate 24 persulfate initiator 1.4 ~ 1.6
α-methylstyrene 7 water 130
Methacrylic acid 1
Another example is that PET waste reacts with polyol at 220 ~ 250℃, and insulation paint with three-dimensional network structure is prepared by solvation. The quality meets the requirements of GB6 109. ③ In addition, PET bottles can also be used to make plasticizer: 2- ethylhexyl terephthalate (DOTP), which is similar to dioctyl phthalate (DOP) in terms of electrical properties and low-temperature flexibility. Waste PET bottles can also be made into adhesives and unsaturated polyester by methods similar to waste PET films.
(2) The charging process of PVC bottles and the recycling process of PVC are as follows.
PVC bottles are cleaned, sorted, crushed, crushed and recycled.
Firstly, the PVC bottles were cleaned with steam and alkali liquor and the trademarks were removed. Then the PVC bottles were sorted mechanically and manually, and the sorted PVC bottles were crushed for the second time. Finally, the powder recovery product with fineness of 500~ 1200μm was obtained, and the purity could reach 99.98%.
(3) extra charge for 3)PE bottles. PE used as bottle material is mainly HDPE, including dairy bottles, food bottles and cosmetic bottles. After sorting and cleaning, the recycled HDPE bottles can be crushed and selected, and their uses are as follows:
① Use colored cola bottle bottom.
(2) The intermediate core layer used for extruding pipes.
③ Fill talcum powder or glass fiber to make flower teacups ... >>
Question 9: What is the material of the beverage bottle? PET is used for carbonated beverage bottles, refreshing beverage bottles, PVC and PE for liquid food bottles, detergent bottles, cosmetic bottles, milk bottles, and PE for lactic acid bacteria drinks.
Question 10: What plastic is the beverage bottle? Look at the numbers in the circular triangle at the bottom of the bottle. Different numbers are made of different materials. 1: PET polyethylene terephthalate
Common mineral water bottles, carbonated beverage bottles, etc. Heat resistance to 70℃ is easy to deform, and substances harmful to human body are melted out. Plastic product 1 may release carcinogen DEHP after using 10 months. Can't put it in the car to bask in the sun; Don't pack alcohol, oil and other substances.
2: HDPE high density polyethylene
Common white medicine bottles, cleaning products, bath products. Don't use it as a cup, or as a storage container for other items. If the cleaning is not thorough, don't recycle it.
3: PVC PVC
Common raincoats, building materials, plastic films, plastic boxes, etc. Excellent plasticity and low price, so it is widely used, and can only resist heat of 865438 0℃. It is easy to produce harmful substances at high temperature and is rarely used in food packaging. It is difficult to clean, and it is easy to remain, so don't recycle it. Don't buy packaged drinks.
4: PE polyethylene
Common cling film, plastic film, etc. Harmful substances will be produced at high temperature, and toxic substances may cause diseases such as breast cancer and birth defects of newborns after entering the human body with food. Don't put plastic wrap in the microwave.
5: PP polypropylene
Common soybean milk bottles, sour milk bottles, fruit juice bottles, microwave lunch boxes. With a melting point as high as 167℃, it is the only plastic box that can be put into a microwave oven and can be reused after careful cleaning. It should be noted that some microwave lunch boxes are made of No.5 PP, but the cover is made of 1 PE. Because PE is not resistant to high temperature, it can't be put in the microwave oven with the box.
6: polystyrene
Common instant noodle boxes and fast food boxes in bowls. Can't put it in the microwave oven, so as not to release chemicals when the temperature is too high. After being filled with acid (such as orange juice) and alkaline substances, carcinogens will decompose. Avoid packing hot food in fast food boxes. Don't cook bowls of instant noodles in the microwave oven.
7: PC other classes
Common kettles, space cups and milk bottles. Department stores often use cups made of this material as gifts. It is easy to release bisphenol A, a toxic substance harmful to human body. Don't heat it when using it, and don't directly bask in the sun.