179 results about "Polytetramethylene glycol" patented technology

A novel aqueous polymerization process for making fluoropolymer dispersions is disclosed in which non-ionic non-fluorinated emulsifier is used to produce fluoropolymer emulsions. The emulsifiers contain blocks of polyethylene glycol, polypropylene glycol and/or polytetramethylene glycol. The process and fluoropolymer produced contain no fluorinated surfactant. The fluoropolymers have excellent resistance to discoloration.

The two-part curable polyurethane foam resin composition uses little or no petroleum-derived raw materials but a plant-derived raw material so that the biomass ratio can be improved, the load on the environment can be reduced, and excellent physical characteristics can be exhibited. The two-part curable polyurethane foam resin composition includes a main agent that contains an isocyanate-terminated urethane prepolymer (A) and a curing agent that contains an isocyanate-reactive compound (B), water (C), and a catalyst (D), in which a polyol component used in (A) and (B) uses a castor oil polyol (b1) having 1.5 to 2.3 functional groups on average and a polyol (b2) prepared by addition polymerization of lactone to polytetramethylene glycol and/or polytetramethylene glycol (b3), the ratio (b1)/(b2) and/or (b3)=15/85 to 60/40 on a mass basis, and a content of the castor oil polyol (b1) is 10 to 45% by mass.

The invention discloses a preparation method of polyurethane elastomer for engineering tire treads. The polyurethane elastomer is prepared from polytetramethylene glycol with the relative molecular weight of 2000, polyether triol EP-330N with the relative molecular weight of 4800, MDI (diphenylmethane diisocyanate), 1,4-butanediol and dibutyltin dilaurate. The polyurethane elastomer for the engineering tire treads prepared by the method has the advantages of no pollution, small wear, low rolling resistance and thermogenesis and excellent tearing resistance. Additionally, the tensile strength of the polyurethane elastomer reaches 31Mpa, the elongation at break of the polyurethane elastomer reaches 518%, the wear volume of the polyurethane elastomer reaches 0.0158cm3 (1.61km)-1, and the compression fatigue temperature rise of the polyurethane elastomer is only 9.2 DEG C.

The invention discloses a waterproof noise-reduction multifunctional woven fabric which is formed by weaving warp yarns and weft yarns by an air-jet loom, wherein the warp yarns and the weft yarns are prepared from the following raw materials in parts by weight: 30 to 36 parts of isotatic polypropylene, 10 to 14 parts of polyvinyl chloride, 20 to 24 parts of cowhair, 17 to 19 parts of alpinia fiber, 22 to 26 parts of kenaf fiber, 18 to 23 parts of cotton pulp, 7 to 9 parts of liquid paraffin, 8 to 10 parts of ethyl carbamate, 7 to 11 parts of polytetramethylene glycol, 1.1 to 2.5 parts of benzoyl peroxide, 2.1 to 3.2 parts of chitosan, 0.3 to 0.5 part of magnesium acetate, 2 to 4 parts of shell powder, 1 to 3 parts of rhizoma, 2 to 5 parts of mangnolia officinalis, 85 to 95 parts of 1-butyl-3-methyl imidazole acetate, 95 to 105 parts of 1-allyl-3-methyl imidazole chloride salt, a proper amount of water and 4 to 7 parts of assistant. The woven fabric has the advantages of warmth keeping, ventilation, wear resistance, antibacterial performance and the like.

The invention belongs to the field of polymeric materials, and concretely relates to a high-performance full-MDI polyurethane mixed component for automobile seats, and a preparation method thereof. The mixed component is prepared through mixing a component A with a component B according to a weight ratio of 100:(65-70), wherein the component A is prepared from polyether polyol A, polyether polyol B, polytetramethylene glycol, a cross-linking agent, a foaming agent, a foam stabilizer, a pore forming agent and a catalyst; and the component B is prepared from polytetramethylene glycol, pure MDI, MDI-50 and crude MDI. The mixed component selects low-volatility and low-atomization reactive raw materials adopts high-molecular weight polyether as the cross-linking agent, and the high-performance material polytetramethylene glycol is introduced to the component A and the component B, so the produced automobile seats have the advantages of low density, good resilience, excellent mechanical performances, good sitting comfortableness, low smell, low content of VOCs, environmental protection and no pollution. The preparation method is simple, and is easy to implement.

The invention relates to bio-based polyalkylene glycol and a preparation method thereof. The product is a segmented copolymer which is prepared by using furfural derivative tetrahydrofuran and 2-methyltetrahydrofuran produced from wood fiber biomass as raw materials by a polymerization process, and has the structure shown in the specification. The preparation method comprises the following steps: adding tetrahydrofuran and an initiator in a mass ratio of 1:(2-10) into a reaction kettle in an inert gas atmosphere, and reacting at a temperature of 80-150 DEG C and a pressure of 0.2-0.5MPa for 4-15 hours to prepare a polytetramethylene glycol homopolymer; cooling the reaction kettle to normal temperature and normal pressure, adding 2-methyltetrahydrofuran into the reaction kettle, reacting at a temperature of 100-120 DEG C and a pressure of 0.4-1MPa for 2-8 hours to prepare the bio-based polyalkylene glycol, wherein the molar ratio of 2-methyltetrahydrofuran to tetrahydrofuran is 1:(1-10). The bio-based polyalkylene glycol has the advantages that the product by a process flow for producing bio-based PAG (polyalkylene glycol) from wood fiber biomass can achieve the performance index of fossil based PAG, and can completely replace an existing fossil based product.

A belt for papermaking shoe presses is provided which comprises a reinforcing fibrous base (6) and a polyurethane layer (2) united therewith, the reinforcing fibrous base (6) having been embedded in the polyurethane layer (2). The belt includes a polyurethane layer obtained by curing a mixture comprising: a urethane prepolymer obtained by reacting a polyisocyanate compound selected among p-phenylene diisocyanate, 4,4'-methylenebis(phenyl isocyanate), and tolylene diisocyanate with a polyol compound selected among polypropylene glycol, polytetramethylene glycol, and a polycarbonate diol; a hardener selected among an aliphatic diol compound, hydroquinone bis-ss-hydroxyethyl ether, and organic polyamine compound; and an aliphatic triol compound. Due to this layer, the shoe press belt for papermaking is excellent in wearing resistance and flexing fatigue resistance.

The invention provides a polysiloxane polyether polyurethane elastomer with a high mechanical property and a preparation method of the elastomer. Diphenylmethane diisocyanate, hydroxypropyl-terminatedpolysiloxane, diphenylmethane diisocyanate and polytetramethylene glycol serve as raw materials and are synthesized into two prepolymers, and then the two prepolymers are mixed and copolymerized by chain extension to prepare the polysiloxane polyether polyurethane elastomer with a specific molecular structure. The prepared polysiloxane polyether polyurethane elastomer with the specific molecularstructure has the excellent mechanical property, the tensile strength of the elastomer can reach 38Mpa, and the breaking elongation of the elastomer can reach 600% or more.

Provided is an electroconductive endless belt by which a good image with uniformity and without local unevenness can be obtained at a lower cost.

Provided is an electroconductive endless belt 100, which is used for an image forming apparatus, in the shape of an endless belt having a laminated structure provided with at least a base layer 101 and a cured resin layer 102 in the mentioned order from the inside. The base layer 101 contains a thermoplastic resin, the cured resin layer 102 contains an ultraviolet curable resin; an ionic conductive agent; at least one of 1,4-butanediol acrylate and a polytetramethylene glycol acrylate; and a polymer having an ethylene oxide, and the content of the ionic conductive agent is 0.5 to 5 parts by mass with respect to the total content 100 parts by mass of an ultraviolet curable resin; at least one of 1,4-butanediol acrylate and polytetramethylene glycol acrylate; and a polymer having an ethylene oxide.

The invention relates to a nylon elastomer material and a preparation method thereof. The nylon elastomer material is composed of the following components in parts by mass, wherein the mass ratio of anylon 1012 salt monomer to a softener to an end-capping reagent is 100:(10-30):(0.1-0.5), and the softener is any one or a combination of more of polybutylene glycol, dimer acid, polyester and polyether; long-carbon-chain decamethylene diamine and aliphatic dodecanedioic acid are used as main raw materials for synthesizing the nylon 1012 salt monomer; the characteristics of good flexibility and high benzene ring rigidity of long-carbon-chain nylon are combined; the nylon matrix resin has relatively good flexibility and crystallinity; the temperature resistance, the alcohol resistance and theoil resistance are good; copolymerization is carried out under a proper reaction condition by using the softener; meanwhile, the active stable polymerization of end groups is eliminated by the end-capping reagent, and the thermal stability, the oxidation resistance and the catalytic activity are improved by the aid of the auxiliaries, so that on one hand, the hardness of nylon is reduced, and thematerial feels soft, and on the other hand, the material can be conveniently used for manufacturing foaming base materials of sneaker soles, is lighter and can be widely used.

The invention discloses a method for preparing cross-linked anti-fatigue and anti-wear polyurethane rubber. The cross-linked anti-fatigue and anti-wear polyurethane rubber comprises the following components in percentage by mass: 65-70% of polytetramethylene glycol, 6-10% of cyclic polypropylene oxide ether triatomic alcohol, 14-20% of toluene diisocyanate, 5-8% of 1,5-naphthalene diisocyanate, 1-3% of di-o-chlorodiphenylamine methane, 0.5-1.5% of trimethylolpropane, 0-0.5% of carbon black and 1-2% of molybdenum disulfide. The rubber has the advantages of high wear resistance, good resilience, good low-temperature resistance, high tensile strength, predominant hydrolysis resistance, good adhesion to metal, shock resistance and relatively good anti-fatigue performance.

A surface agent includes two end portions and a middle portion disposed between the end portions. The end portions include a terminal section and a midsection. The terminal section includes at least one surface active functional group. The midsection includes at least one perfluoroethyl ether unit. The middle portion includes at least one perfluorobutyl ether unit.

A novel aqueous polymerization process for making fluoropolymer dispersions is disclosed in which non-ionic non-fluorinated emulsifier is used to produce fluoropolymer emulsions. The emulsifiers contain blocks of polyethylene glycol, polypropylene glycol and/or polytetramethylene glycol. The process and fluoropolymer produced contain no fluorinated surfactant. The fluoropolymers have excellent resistance to discoloration.

The invention provides an aqueous polyurethane emulsion preparation method. The preparation method comprises the following steps: subjecting waste polyurethane fibers to an alcoholysis treatment so as to obtain a mixture of hydroxyl terminated polyurethane with a molecular weight of 5000 to 10000 and polyol, and directly subjecting the mixture to processes of pre-polymerization, chain propagation, and emulsification so as to one-step obtain aqueous polyurethane emulsion; wherein the waste polyurethane fiber is preferably selected from waste polyether type polyurethane fiber and/or polycarbonate type polyurethane fiber generated by dry spinning or wet spinning; more preferably, the waste polyurethane fiber is selected from waste polytetramethylene glycol type polyurethane fiber and/or polycarbonate diol type polyurethane fiber whose soft section ratio is 85% or more; and most preferably, the waste polyurethane fiber is waste polytetramethylene glycol type polyurethane fiber whose soft section ratio is 85% or more. The preparation method provided a more reasonable reutilization method with a more additional value for waste high-grade polyurethane fibers.

The invention provides a polyurethane composite color fixing agent and a preparation method thereof. The preparation method comprises a step (1) of placing polyethylene glycol and polytetramethylene glycol in a vacuum drying oven to perform drying; a step (2) of adding polyethylene glycol and polytetramethylene glycol in a three-opening flask, adding isophorone diisocyanate and trimethyl hexamethylene diamine with slow stirring, and warming to 50-70 DEG C to perform stirring; a step (3) of performing cooling to room temperature, adding polypropylene oxide glycol, p-tyrosol, sodium citrate, dibutyltin dilaurate and dibutyl tin diacetate, performing stirring reaction for 40-60 min; a step (4) of adding octamethyl cyclotetrasiloxane, trimethylolpropane and glycerin, and warming to 50-70 DEG C to react for 40-60 min; a step (5) of performing reduced pressure distillation to remove a solvent; a step (6) of performing cooling to room temperature, and adding deionized water to perform high-speed stirring for 20-30 min to obtain the polyurethane composite color fixing agent. The polyurethane composite color fixing agent is very high in dry friction and wet friction color fastness grade, substantially does not discolor when washed, does not stain, and is good in color fixing effect.