Question 1: polytetrahydrofuran glycol (PTHF) or polyoxytetramethylene glycol (PIG, PTMEG, PTMG, PTMO), which are commonly used polyether polyols, are formed by ring-opening polymerization of tetrahydrofuran in the presence of cationic catalysts. Production process: adding tetrahydrofuran into the reaction kettle, cooling to below -5℃, dropwise adding fuming sulfuric acid catalyst under strong stirring, keeping the reaction material at low temperature, adding a certain amount of water under stirring, heating to 70-90℃, evaporating unreacted tetrahydrofuran monomer, and making polytetrahydrofuran glycol through the procedures of standing, layering, neutralization, filtering, vacuumizing, etc. Polytetrahydrofuran glycol is expensive and is generally used to prepare high-performance polyurethane materials. Its products have excellent properties such as low temperature resistance, water resistance, oil resistance, wear resistance and mildew resistance. Tetrahydrofuran-propylene oxide copolymer ethylene glycol is prepared by ring-opening polymerization of tetrahydrofuran and propylene oxide under the catalysis of Lewis acid, followed by neutralization, water washing, dehydration and filtration. The structural formula is as follows: The product specifications of tetrahydrofuran-propylene oxide copolymer ethylene glycol are shown in Table 3-28. The cost of this copolyether is lower than that of pure polytetrahydrofuran glycol, and the product performance is similar to PTMG, which is especially suitable for manufacturing low-temperature resistant polyurethane materials (cold resistance can reach -200℃). 4. 1 active polyether polyol replaces the secondary hydroxyl group of ordinary polyether terminal group with primary hydroxyl group or amino group, thus introducing new varieties such as cold curing process, reactive injection molding, self-skinning foam and high resilience. 4.2 Flame-retardant polyether polyol makes flame-retardant molecules enter the polymer molecular chain through chemical reaction, which makes the flame-retardant performance lasting. There are usually three methods: ① Using compounds containing flame retardant elements as initiators, such as phosphorus oxychloride, antimony pentoxide, tetramethylphosphorus chloride and many low-molecular-weight phosphate esters, reacting with ordinary low-molecular-weight polyols, and then ring-opening polymerization with propylene oxide and ethylene oxide. ② Ring-opening polymerization with halogen-containing epoxy monomer as raw material. And (3) simultaneously carrying out ring-opening polymerization with halogen-containing epoxy compound monomer, phosphorus-containing and antimony-containing compounds and initiator mixture to generate composite polyether polyol. 4.3 Grafted polyether polyol is basically formed by one-step copolymerization or two-step copolymerization of ordinary or high-activity polyether polyol or polyether polyol containing unsaturated bond and vinyl monomer compound, and then transferred to a delicate container to remove unreacted monomer, and a stabilizer is added to obtain the product. 4.4 Polytetrahydrofuran polyol is used to prepare high-performance polyurethane fibers, thermoplastics, synthetic leather and other products. 4.5 Introduce aromatic ring or heterocyclic ring into heterocyclic modified polyether polyol polymer system.

Question 2: The main uses and properties of polyether polyol 4 1 10 for rigid foams. The basic production process of 20-minute polyether polyol (polyether for short) is formed by addition polymerization of initiator (compound containing active hydrogen group) with ethylene oxide (EO), propylene oxide (PO) and butylene oxide (BO) in the presence of catalyst. The largest output of polyether is glycerol and epoxide as initiators (usually PO and EO are used together). By changing the feeding mode (mixing or separating), feeding ratio and feeding sequence of PO and EO, various general polyether polyols were produced.

According to the number of active atoms contained in the initiator, polyether polyols with different functionalities can be prepared. The most commonly used polyethers in the preparation of polyurethane adhesives are polyoxypropylene glycol and polyoxypropylene triol, and polytetrahydrofuran glycol.

Question 3: What role does polyether polyol play in polyurethane foaming? Stp insulation board has good energy-saving effect, ultra-thin 1M, and thermal conductivity is much lower than polyurethane, about 0.006. It belongs to Class A products, does not absorb water, has high bonding strength, is convenient to construct and comfortable to live in, and saves 50% and 50% electricity according to user's measurement. Polyurethane Polyurethane belongs to B2 flammable -B3 flammable, with water absorption of 350g/O and thickness of 5-8M. General thermal insulation performance, poor fire resistance, low shear resistance, low tensile strength, high water absorption, poor adhesion and easy aging and cracking. Can comprehensive comparison of stp insulation board solve your problem?

Question 4: the difference between polyether 1000 and polyether polyol: polytetrahydrofuran glycol (PTHF) or polyoxytetramethylene glycol (PIG, PTMEG, PTMG, PTMO) is formed by ring-opening polymerization of tetrahydrofuran in the presence of cationic catalyst.

Question 5: What is "rigid polyether"? What is its main purpose? 5 points hard foam polyether is product hard, which is the hunger of hard foam polyether. The synthesis is mainly composed of sugar, sorbitol, lower alcohol and propylene oxide at a certain temperature and pressure. Polyurethane rigid foam combined polyether is one of the main raw materials of polyurethane rigid foam, also known as white material, and together with polymeric MDI, it is also known as black and white material. It is mainly used for building thermal insulation, cold preservation, solar energy, water heaters, cold storage, constant temperature storage, beer cans, cold storage and other occasions that need thermal insulation and cold preservation.

Question 6: Main uses of propylene oxide: propylene oxide (PO) is the third largest propylene derivative besides polypropylene and acrylonitrile, and it is an important raw material for basic organic chemical synthesis, mainly used to produce polyether and propylene glycol. It is also the main raw material of the fourth generation detergent nonionic surfactant, oil field demulsifier and pesticide emulsifier. Propylene oxide derivatives are widely used in automobile, construction, food, tobacco, medicine and cosmetics industries. Nearly 100 kinds of downstream products have been produced, which are important raw materials for fine chemical products. 10. 1 polyether polyol propylene oxide is mainly used to produce polyether polyol (PPG). Polyether polyol is derived from propylene oxide and is an organic material containing two or more hydroxyl groups (OH). Some polyether varieties contain micron-sized suspensions of polymeric physical particles. The biggest use of polyether polyol is to produce polyurethane plastics; Secondly, it is used as surfactant, such as foam stabilizer, defoamer in paper industry, demulsifier for crude oil, wetting agent for acid treatment of oil wells, high-efficiency low-foam detergent and so on. It is also used as lubricant, hydraulic fluid, heat exchange fluid and quenching agent, latex foaming agent, various cutting and drafting agent components and special solvents. China propylene oxide is mainly used to produce polyether polyol (PPG). Due to the different types of initiators, the polyether produced can be divided into soft foam polyether, hard foam polyether and elastomer polyether. Flexible polyether, mainly used as polyurethane flexible foam, used in mattresses, sofas, furniture and car cushions; Rigid foam polyether is mainly used as polyurethane rigid foam, used for heat preservation, refrigerator and so on. Elastomer polyether is mainly used as polyurethane elastomer, used in sports track, coating, adhesive, sealant and so on. 10.2 the second main use of propylene glycol propylene oxide is to produce propylene glycol, alcohol ether and propylene carbonate, and then it is used to manufacture storage tanks, bathroom equipment and ship hulls. Propylene glycol is the general name of monopropylene glycol (MPG), dipropylene glycol (DPG) and tripropylene glycol (TPG). Propylene glycol is the raw material for making unsaturated polyester resin, epoxy resin and polyurethane resin. It is also an intermediate for the production of surfactants such as emulsifiers and demulsifiers; Because of its low toxicity, it can also be used as a solvent for food pigments, spices and cosmetics; It can also be used as tobacco wetting agent, mildew inhibitor and fruit ripening preservative; In pharmaceutical industry, propylene glycol is widely used as adjuvant and wetting agent for drugs in liquid or ointment form; In food industry, propylene glycol fatty acid ester can be used as food emulsifier, and propylene glycol is also an excellent solvent for condiments and pigments. In paints, pigments and daily chemistry, propylene glycol is mainly used to produce plasticizers, solvents and tackifiers (such as toothpaste). 10.3 propylene glycol ether propylene glycol ether is a widely used organic solvent with low toxicity, which is widely used in coating industry, brake fluid, antifreeze, jet engine fuel additive, floor polishing agent, printing ink, electronic chemicals, cleaning agent, mineral treatment agent, leather processing, photosensitive liquid for PS plate, short-acting plasticizer, dye, pesticide and other fields. At the same time, ethylene glycol ether is also widely used to synthesize alcohol ether acetate. 10.4 other industries in addition, a small amount of propylene oxide is also used in coatings, nonionic surfactants, demulsifiers for oil fields, flame retardants, pesticide emulsifiers, wetting agents and other industries. Propylene oxide can also be directly used as packaging fumigant for dried fruits and bulk fumigant for foods such as cocoa, spices, screw meat, starch and gum.

Question 7: What is the relationship between polyether monomer and polyether polyol? They are not upstream and downstream, but belong to a kind of polyether, but have different uses.

Ethylene oxide (EO) and propylene oxide (PO) are their upstream.

Polyether monomer: mainly composed of ethylene oxide and other monomers. At present, there are mainly three kinds in China: polyethylene glycol monomethyl ether (MPEG), allyl polyoxyethylene ether (APEG) and methyl alkenyl polyoxyethylene ether (TPEG). Polyether monomer is often used as polycarboxylic acid water reducer in construction industry, and the water reducer is downstream of polyether monomer.

Polyether polyol: It is formed by addition polymerization of initiator (compound containing active hydrogen group) and propylene oxide (PO) in the presence of catalyst. Polyether polyols generally use propylene oxide as polymerization monomer, and the amount of ethylene oxide is less. Generally speaking, polyether polyols are used in polyurethane synthesis, and the polyurethane industry is downstream of polyether polyols. Driven by the polyurethane industry, there are many kinds and brands of polyether polyols, which are more widely used in the market than polyether monomers.

Question 8: Is the viscosity of polyether polyol as low as possible? There are many kinds of polyether polyols that affect the properties of polyurethane, and the molecular chain structure, functionality and formula will inevitably affect the properties of polyurethane. Viscosity is just an appearance characterization of polyol. It cannot be said that the smaller the viscosity, the better. It can only be said that polyols without viscosity are suitable for polyurethanes with different properties. For example, high resilience flexible foam polyurethane needs polyether polyol with large molecular weight and viscosity; Rigid foams usually use polyols with low viscosity. In addition, the polyurethane prepared by polyether polyol has excellent hydrolysis resistance, and its mechanical properties are slightly worse than polyester.

Therefore, the performance of polyurethane is determined by the molecular chain structure of polyol and other factors, not the viscosity. You can ask me directly if you have any questions.