345 results about "Hydroxyl value" patented technology

The invention discloses a deep eutectic solvent / bimetal organic framework co-catalyzed straw polyol as well as a preparation method and application thereof, the straw polyol is prepared by the following method: uniformly mixing straw powder, small molecular alcohol, an acid catalyst and a deep eutectic solvent in a nitrogen atmosphere, and reacting to obtain a reaction product; and adding a bimetal organic framework catalyst into the reaction product, and reacting to obtain the straw polyol. A green, natural and pollution-free eutectic solvent catalytic liquefaction technology is adopted, lignin and hemicellulose can be dissolved, the cross-linking effect between lignin and hemicellulose and cellulose is reduced, the crystalline structure of cellulose can be destroyed, the available surface area is increased, the contact with a liquefying agent is enhanced, the conversion efficiency is improved, and the residue rate is reduced; the bimetallic organic framework catalyst is added in the middle and later periods of the reaction, aldehydes, ketones and acid and ester substances can be reduced and upgraded into alcohols, the hydroxyl value of the liquefied polyol is greatly increased, and the film-forming crosslinking degree is improved.

A polyester polycarbonate polyol having a repeating unit represented by specific formula (1) and a repeating unit represented by specific formula (2), having a hydroxyl value of 35 to 85 mgKOH / g, having a hydroxyl group at a terminal, and being in the form of a liquid at ordinary temperature.

The invention relates to the technical field of pouring sealant coatings, in particular to a two-component polyurethane circuit board pouring sealant and a preparation method thereof. Comprising a component A and a component B. The component A comprises liquefied MDI, a phosphate flame retardant and a plasticizer. The component B comprises a hydroxyl acrylate oligomer, bio-based polyol, a defoaming agent and a catalyst, the viscosity of the hydroxyl acrylate oligomer at the temperature of 25 DEG C is 8000-15000 mPa.s, and the hydroxyl value of the hydroxyl acrylate oligomer is 100-150 mgKOH / g. The viscosity of the hydroxyl acrylate oligomer at 25 DEG C is limited to be 8000-12000 mPa.s, and the hydroxyl value is 100-140 mgKOH / g, so that the mechanical properties and aging resistance of the pouring sealant can be improved at the same time.

The invention belongs to the technical field of polyester polyol, and particularly relates to high-functionality low-viscosity polyester polyol and a step-by-step synthesis method thereof. Comprising the following steps: (1) adding dihydric alcohol, dicarboxylic acid, a catalyst and an antioxidant into a reaction kettle, heating and vacuumizing, and carrying out esterification and ester exchange reaction to prepare a polyester polyol intermediate; and (2) cooling the polyester polyol intermediate prepared in the step (1), adding polyol into the reaction kettle, and continuously carrying out ester exchange reaction to obtain the high-functionality low-viscosity polyester polyol after the reaction is finished. According to the step-by-step synthesis method, the problems that in the prior art, high-functionality polyester polyol is large in viscosity and low-viscosity products are difficult to prepare are solved, the viscosity of the high-functionality polyester polyol can be effectively reduced under the same raw material system and hydroxyl value conditions through specific raw material selection and process control, and the method is simple in process and easy to implement. The industrial production is convenient.

The invention relates to a silicon-containing polycarbonate diol, a polyurethane elastomer material and a preparation method thereof, and belongs to the technical field of organic materials. The glass transition temperature (Tg) of the silicon-containing polycarbonate diol ranges from 40 DEG C to 60 DEG C below zero, the hydroxyl value ranges from 60.4 mgKOH / g to 67.9 mgKOH / g, the product purity is high, the product purity is 98 or above, and the number-average molecular weight of the polycarbonate diol ranges from 1900 Da to 2200 Da. The low-temperature flexibility of the polycarbonate diol is effectively improved, and the use temperature range of the polycarbonate diol is widened. The polycarbonate diol disclosed by the invention is stable in hydroxyl value and narrow in molecular weight distribution; the product quality is good, and subsequent application is facilitated. The polycarbonate diol is short in preparation time, high in efficiency, simple in technological process, mild in technological condition and suitable for large-scale industrial production. The raw materials are low in cost.

The invention belongs to the technical field of preparation and surface protection of polyurethane coatings, and particularly relates to weather-resistant polyurethane and a preparation method thereof. The coating provided by the invention is composed of a component A and a component B according to a weight ratio of 1: (0.2-0.4). The component A is prepared from water-based fluorine-containing hydroxy acrylic dispersion resin with a high hydroxyl value, GMA (glycidyl methacrylate) grafted modified water-based acrylic dispersion resin, a benzotriazole ultraviolet light absorber, a light hindered amine stabilizer, rutile titanium dioxide, wet sericite powder, nano zinc oxide and auxiliaries; and the component B comprises an aliphatic isocyanate curing agent and propylene glycol diacetate. By constructing a quadruple synergistic weather-resistant mechanism of ultraviolet absorption, free radical capture, physical shielding and structural densification, the weather resistance and corrosion resistance of the coating are remarkably improved while the coating keeps excellent adhesive force (0-1 level) and hardness (2H-3H), the color change delta E is smaller than or equal to 1.8 after artificial accelerated aging for 1000 hours, the gloss loss rate is smaller than or equal to 23%, and the weather resistance and corrosion resistance of the coating are greatly improved. And the corrosion spreading width of a 600-hour salt spray test lineation is less than or equal to 2.3 mm.

The present invention discloses a method for measuring the hydroxyl value of a polyether polyol using nuclear magnetic resonance phosphorus spectroscopy, comprising: 1) adding a polyether polyol sample to be tested and an internal standard bisphenol A to a deuterated reagent and dissolving them by ultrasonication; 2) adding a phosphorus oxychloride compound and an acid binding agent to the mixture and allowing them to react fully to obtain corresponding different derivatized phosphorus-containing products; 3) performing a phosphorus spectroscopy test in a nuclear magnetic resonance analyzer to obtain nuclear magnetic resonance phosphorus spectroscopy data, processing and analyzing the data, integrating the nuclear magnetic resonance characteristic peak areas of the phosphorus-containing products after derivatization of the polyether polyol sample and the internal standard bisphenol A, and normalizing them to 100%, and calculating the hydroxyl value of the sample to be tested based on the molar ratio relationship between the products. The hydroxyl value result obtained by the present method has a relative deviation of less than 5% from the result obtained by the phthalic anhydride acylation method in the national standard GB / T 12008.3-2009, and the two results are close and highly accurate. The analytical testing method of the present invention is simple, has low pollution, and is short in time.

The present invention belongs to the technical field of the preparation of modified isocyanates, and particularly relates to a modified isocyanate, a preparation method thereof and an application; the modified isocyanate comprises: 70-94 parts of an organic isocyanate; 6-30 parts of polyether polyol i; the polyether polyol i is a polyether polyol randomly copolymerized with EO / PO monomers and capped with EO, or a polyether polyol block copolymerized with PO monomers and capped with EO, or a mixture of the two; the average molecular weight of the polyether polyol i is 2000-10000, the functionality is 2-4, the EO content is 5-29 wt%, the hydroxyl value is 20-80 mgKOH / g, and the primary hydroxyl group content is greater than or equal to 70%. The modified isocyanate of the present invention has good storage stability, and the slow-rebound polyurethane foam prepared therefrom has fine open cells, and has the advantages of high tolerance, good tear performance, and good sound absorption and sound insulation effects.

The invention discloses an overwater photovoltaic low-smoke halogen-free polyolefin composition as well as a preparation method and application thereof. The polyolefin composition comprises the following components in parts by weight: 15-90 parts of polyolefin resin; 3 to 10 parts of polyolefin grafted maleic anhydride; 50 to 100 parts of a halogen-free flame retardant; 0.3 to 2 parts of a coupling agent; 0.3 to 1 part of an amphiphilic surfactant; 0.5 to 2 parts of a crosslinking auxiliary agent; wherein the content of vinyl acetate in the polyolefin resin is 14 wt%-26 wt%; the hydroxyl value of the amphiphilic surface active agent is 25 to 60 mgKOH / g. According to the invention, the polyolefin resin is selected as matrix resin, the content of vinyl acetate in the polyolefin resin is adjusted, the amphiphilic surfactant with a specific hydroxyl value is added, and the coupling agent is combined, so that the prepared polyolefin composition has better water breakdown resistance, and is particularly suitable for a water photovoltaic cable sheath material.

According to the high-flame-retardant cryogenic insulating material and the preparation method and application thereof, low-hydroxyl-value flame-retardant polyester polyol and a flame retardant are adopted, the dosage of a chemical foaming agent is reduced, a physical foaming agent reduces the foam density and takes away heat, the flame retardance of a polyurethane material is improved, meanwhile, the reaction rate is reduced, the core burning risk is reduced, the oxygen index is larger than 30%, and the heat conductivity is smaller than 0.022 W / mK at 25 DEG C; the flame retardant grade is high; the polyester polyol has activity, so that the requirement on the activity of the catalyst and the dosage of the catalyst are reduced, and the odor grade is lower than 2.5; the low-hydroxyl-value flame-retardant polyester polyol is combined with high-functionality polyether polyol A and B for use, so that the foam size stability is improved, the foam shrinkage risk is reduced, the density of the product is 40-45 kg / m < 3 >, the compression strength is larger than 250 kPa, the tensile strength is larger than 350 kPa, the water absorption rate is smaller than 0.5%, and the size stability is smaller than 1% at-196 DEG C; the catalyst and the retarder balance milky white and gelation time, gentle the foaming rate, prevent core burning and match continuous production at the same time, the process performance is stable, the product performance is excellent, the productivity and efficiency are improved, and the cost is greatly reduced.

The invention discloses a water-based intermediate coat composition with low-temperature stone impact resistance, water-based intermediate coat prepared from the water-based intermediate coat composition and application of the water-based intermediate coat composition. The water-based intermediate coat composition is prepared from the following components in parts by weight: 4 to 8 parts of water-based polyurethane dispersion A, 8 to 15 parts of water-based polyurethane dispersion B, 2 to 5 parts of methylated amino resin, 5 to 10 parts of mixed etherified amino resin and 0.2 to 0.4 part of phosphate adhesion promoter, wherein the hydroxyl value of the waterborne polyurethane dispersion A is lt; the acid value is 20-35 mgKOH / g, and the number-average molecular weight is gt; the particle size of the resin is 50-100nm, and the pH (Potential of Hydrogen) of the dispersion is 7.0-8.5; the hydroxyl value of the waterborne polyurethane dispersion B is 95-125 mgKOH / g, the particle size of the resin is 30-80 nm, and the pH value of the dispersion is 7.0-9.0.

A polishing liquid containing: abrasive grains; an additive; and water, in which the additive includes (A1) a polyglycerol having a weight average molecular weight of 350 to 2800 and (B) a compound having two or more nitrogen atoms to which a hydroxyalkyl group is bonded. A polishing liquid containing: abrasive grains; an additive; and water, in which the additive includes (A2) a polyglycerol having a hydroxyl value of 800 to 1000 mgKOH / g and (B) a compound having two or more nitrogen atoms to which a hydroxyalkyl group is bonded.

The purpose of the present invention is to provide a method for forming a multilayer coating film which makes it possible to form a multilayer coating film having excellent metallic mottling resistance. The method for forming a multilayer coating film comprises: (1) a step for applying a first aqueous coating material (P1) on an object to be coated to form a first coating film; (2) a step for applying a second aqueous colored coating material (P2) on the first coating film to form a second colored coating film that contains a binder component (AP2) and lustrous pigment (BP2); (3) a step for applying a clear-coat coating material (P3) on the second colored coating film to form a clear-coat coating film; and (4) a step for heating a multilayer coating film that includes the first coating film, the second colored coating film, and the clear-coat coating film so as to cure the multilayer coating film all at once. The first aqueous coating material (P1) contains a compound (A) containing a hydroxyl group and an acid group and that has an acid value of from 50 to 150 mg KOH / g, a hydroxyl value of from 100 to 300 mg KOH / g, and a weight-average molecular weight of from 500 to 8000, a film-forming resin (B), and a crosslinking agent (C).

The invention provides a method for detecting the hydroxyl value of a polyether material. The method comprises the following steps: (1) constructing a standard quantitative system of a derivatization reagent; (2) fully reacting a to-be-detected polyether material with the excessive derivatization reagent; (3) testing the peak area of the unreacted derivatization reagent by adopting chromatography; (4) comparing with a standard quantitative system of the derivatization reagent, and calculating the content of the unreacted derivatization reagent; and (5) calculating the consumption of the derivatization reagent in the step (2) by using the calculated content of the unreacted derivatization reagent, thereby calculating the hydroxyl value of the polyether material according to the stoichiometric relationship. Wherein the derivatization reagent comprises at least one hydroxyl esterifying agent selected from the following groups: phthalic anhydride, acetic anhydride and benzoyl chloride.

The invention discloses a synthesis method of bisphenol A polyether, and belongs to the technical field of fine chemical synthesis. According to the synthesis method, bisphenol A is taken as an initiator, and a composite catalyst composed of carbonate, an amine compound and organic phosphine is adopted to catalyze ring-opening polymerization reaction of alkylene oxide, so that bisphenol A polyether with low hydroxyl value and light color is prepared. The problems that in the prior art, a product is prone to isomerization and decomposition under the action of a strong base catalyst, and the color and luster of the product are darkened are effectively solved.

The invention discloses an environment-friendly polyurethane adhesive which comprises a component A and a component B. The component A is prepared from the following raw materials in parts by weight: 10-50 parts of vegetable oil, 5-30 parts of polyether polyol, 0.1-0.5 part of a chain extender, 40-70 parts of solid filler, 0.1-1 part of an auxiliary agent and 5-20 parts of an adsorbent. And the component B comprises a curing agent. According to the environment-friendly adhesive, the polyether polyol with the hydroxyl value of 270-290 mgKOH / g, the viscosity of 40-140 mPa.s at the temperature of 25 DEG C and the K < + > value content smaller than or equal to 3 ppm is adopted, and the environment-friendly adhesive can have long-term tensile shear strength and peel strength. The epoxy group-containing silane coupling agent 3-glycidyl ether oxypropyl trimethoxy silane is adopted, so that the service life of the polyurethane adhesive can be prolonged, the influence of external environment humidity on the adhesive is avoided, and the long-term peel strength and tensile shear strength of the adhesive are maintained.

The invention relates to a preparation method of a waterborne polyurethane dispersion liquid, which comprises the following steps: heating polyester polyol, a solvent and a catalyst in a container to 50 DEG C, stirring, adding isocyanate in an inert atmosphere, continuously stirring, heating to 85 DEG C, and carrying out heat preservation reaction; adding a hydrophilic agent, reacting until the hydroxyl value in the hydrophilic agent is completely consumed, and adding a micromolecular chain extender and a cross-linking agent; cooling to 50 DEG C, adding a neutralizer into the system, continuously stirring, and standing at room temperature to obtain a prepolymer; slowly transferring the prepolymer after standing into a reaction kettle in which quantitative water is added, stirring, dropwise adding a defoaming agent into a system after the prepolymer is added, stirring at a high speed, adding a chain extender, reacting for 30 minutes, reducing the speed, and continuously stirring for 5 minutes, so as to obtain the waterborne polyurethane dispersion liquid. According to the invention, polyester polyol prepared from polyacid containing a benzene ring structure is selected, and a TMP cross-linking agent is added into a prepolymer system, so that the prepared waterborne polyurethane dispersion liquid has high stability, good adhesive force with BOPET (Biaxially Oriented Polyester), no adhesion after high temperature and high humidity, and organic solvent wiping resistance.

The invention belongs to the technical field of polyether synthesis, and discloses a synthesis method of dimethyl-terminated polyether. The synthesis method comprises the following steps: mixing methanol polyether with an alkoxide reagent, heating and degassing, then adding an adsorbent and a seed crystal, then adding chloromethane to carry out a curing reaction, and finally carrying out secondary degassing to prepare the dimethyl-terminated polyether, wherein the seed crystal is selected from at least one of disodium hydrogen phosphate, sodium dihydrogen phosphate, dipotassium phosphate and potassium dihydrogen phosphate; the adding amount of the seed crystal is 0.1%-2% of the mass of the methanol polyether. According to the synthesis method provided by the invention, a synthesis process and a refining process are combined, and the total process time can be greatly shortened, the preparation efficiency can be improved and the production cost can be reduced by controlling the adding time of the adsorbent and the crystal and cooperatively using the adsorbent and the crystal; and moreover, the quality of the dimethyl-terminated polyether can be improved, and the prepared dimethyl-terminated polyether finished product is light in color, low in hydroxyl value, low in potassium and sodium ion content and high in termination rate.

The invention belongs to the technical field of polyether polyol and preparation thereof, and particularly relates to pentafluorophenol modified o-aminobenzoic acid polyether polyol, a preparation method thereof and application of the pentafluorophenol modified o-aminobenzoic acid polyether polyol in rigid polyurethane foam. The pentafluorophenol modified o-aminobenzoic acid polyether polyol is prepared by taking pentafluorophenol modified o-aminobenzoic acid and polyol as a mixed initiator and polymerizing the mixed initiator with alkylene oxide under the action of a composite catalyst, the pentafluorophenol modified anthranilic acid is prepared by carrying out esterification reaction on pentafluorophenol and anthranilic acid in a molar ratio of 1: (1-1.2). The pentafluorophenol modified o-aminobenzoic acid polyether polyol provided by the invention is moderate in viscosity, hydroxyl value and functionality, and when the pentafluorophenol modified o-aminobenzoic acid polyether polyol is applied to preparation of rigid polyurethane foam, the heat conductivity coefficient of the rigid polyurethane foam can be effectively reduced, and the thermal insulation performance of the rigid polyurethane foam is improved. The invention also provides a preparation method of the pentafluorophenol modified anthranilic acid polyether polyol.

High resiliency polyurethane foams are made by reacting a polyisocyanate with a mixture of polyols and water. The polyols include a cell opener. The cell opener is a random copolymer of 60 to 80 wt.-% ethylene oxide and correspondingly 40 to 20 wt.-% propylene oxide having a nominal functionality of 2 to 4 and a hydroxyl number of 25 to 50, wherein 50 to 75% of the hydroxyl groups of polyether polyol are primary hydroxyl groups, which is made using a modified double metal cyanide catalyst.

To provide a curable resin composition for flexible film coating capable of forming a cured film excellent in flexibility and scratch resistance.SOLUTION: The curable resin composition for flexible film coating according to an embodiment contains a urethane (meth)acrylate and a tetrafunctional thiol compound. The urethane (meth)acrylate is a reaction product of a raw material containing: a pentaerythritol (meth)acrylate having a hydroxyl value of 150-240 mg KOH / g; and an aliphatic polyisocyanate.SELECTED DRAWING: None

The invention discloses all-water foaming ultralow-density polyurethane foam and a preparation method thereof. The foam is prepared from the following components in parts by weight: 100 parts of polyether polyol composition, 100 to 150 parts of polyisocyanate and 20 to 30 parts of water, the polyether polyol composition is prepared from 30 to 52 percent of polyether polyol A, 25 to 50 percent of polyether polyol B and 5 to 15 percent of polyether polyol C; the functionality of the polyether polyol A is 2-3, and the hydroxyl value of the polyether polyol A is 25-60 mgKOH / g; the polyether polyol B is vinyl polymer grafted polyether polyol with the functionality of 3, and the hydroxyl value of the polyether polyol B is 21-32 mgKOH / g; and the functionality of the polyether polyol C is 3-6, and the hydroxyl value of the polyether polyol C is 350-500 mgKOH / g. The density of the polyurethane foam material is 3-8 kg / m < 3 >, the aperture ratio is larger than or equal to 95%, and the polyurethane foam material has the advantages of being light in weight, high in squaring amount, high in strength, not prone to shrinkage and the like.

The present invention belongs to the field of new materials. Provided are a polyether-type thiol composition and the use thereof. The polyether-type thiol composition comprises a polyether-type thiol compound and a compound as represented by formula (1), wherein the polyether-type thiol compound is mainly obtained by means of a reaction between a polyhydric alcohol, a halogenated hydrocarbon and a sulfhydrylization reagent, with the hydroxyl value of the polyhydric alcohol being 300-600 mgKOH / g; and the compound as represented by formula (1) is 0.01%-8% of the total mass of the polyether-type thiol composition. The polyether-type thiol composition can be used independently or used in a mixture with other thiol compounds; and the polyether-type thiol composition and an epoxy resin are cured under the action of an accelerant and an auxiliary agent so as to prepare an adhesive, and the adhesive can be used as a raw material to prepare a sealant. The polyether-type thiol composition can not only achieve rapid curing of an epoxy resin adhesive at room temperature, but can also improve the flexibility of an adhesive system, thereby improving the long-lasting safety of an application scenario of a sealant product in the building industry, thus maintaining the physical and psychological health of a human body for a long time.

The invention discloses a two-component polyurethane foam adhesive for waterproof engineering and a preparation method thereof, and relates to the technical field of building waterproofing. The adhesive consists of a component A and a component B; the component A is a polyurethane prepolymer with an NCO content of 5-8%; the component B consists of a second polyol, a catalyst, an auxiliary agent, a chain extender, a coupling agent and a filler; the auxiliary agent is one or two of epoxidized modified polybutadiene or epoxidized terminal hydroxyl polybutadiene, and the epoxy value of the auxiliary agent is 0.5-1.5 mmol / g, and the hydroxyl value is 0.7-1.5 mmol / g; the two-component polyurethane foam adhesive for waterproof engineering of the invention is a two-component solvent-free environmentally friendly adhesive, has micro-foaming, excellent wear resistance and bonding performance, low thermal conductivity and excellent thermal insulation effect, and is mainly used for repairing and bonding PVC coiled materials and asphalt waterproof coiled materials in waterproof engineering.

The invention relates to a composite catalyst as well as a preparation method and application thereof, and mainly solves the problems of high temperature, more byproducts, catalyst residues, equipment corrosion, low catalytic efficiency of a novel catalyst and the like when a traditional strong acid catalyst system is used in the prior art. The research method comprises the following steps: preparing a sulfonic acid alkyl imidazole compound catalyst by a two-step method; 1 wt% of the catalyst is used for carrying out esterification reaction on polyhydric alcohol and fatty acid; after the reaction is finished, a product is separated from the catalyst, and the ionic liquid is recycled; and carrying out weak base washing, filtering and water washing refining on the product. The catalytic efficiency of the catalyst reaches up to 99.5% or above, the product hydroxyl value is smaller than 5 mgKOH / g, the acid value is smaller than 0.5 mgKOH / g, and the esterification efficiency is still kept to be 99.0% or above after the catalyst is recycled 6 times. The method has the advantages of simple process, mild reaction conditions and recyclable catalyst, well solves the problems of high temperature, catalyst residue, many byproducts and equipment corrosion in the traditional catalytic esterification system, and can be used in the preparation process of various ester products.

The invention provides a preparation process of a high-elastic pressure-resistant air-permeable and water-permeable sponge. The sponge is prepared from the following components in parts: 40 to 60 parts of highly branched polyester polyol, 37 to 43 parts of polyether polyol, 50 to 56 parts of isocyanate, 1.5 parts of multiwalled carbon nanotubes, 2.0 parts of nano silicon dioxide, 1.0 part of montmorillonite, 0.54 to 0.7 part of silane coupling agent, 2.0 to 3.1 parts of polyethylene glycol and 0.8 part of bimetallic catalyst. 1.8 parts of a foaming agent, 15 parts of a supercritical agent and 1.2 parts of an opening agent; the preparation method comprises the following steps: S1, carrying out segmented vacuum dehydration on highly branched polyester polyol and polyether polyol, carrying out xylene ultrasonic treatment on multi-walled carbon nanotubes and a silane coupling agent, and carrying out high-shear mixing to prepare a nanofiller dispersion liquid; through step-by-step dehydration, polyol thermal degradation is reduced, the hydroxyl value retention rate is improved, the integrity of a cross-linked network is ensured, through step-by-step dehydration and magnetic field dispersion, the problems of polyol thermal degradation and nano agglomeration are solved, and superuniform dissolution and precise regulation and control of double-peak aperture are realized through pulse injection and magnetic field coupling foaming.

The invention belongs to the technical field of polyurethane foam, and particularly relates to a polyurethane foam material as well as a preparation method and application thereof. The polyurethane foam material is a product obtained by reaction of a polyether polyol composition A and a modified isocyanate prepolymer B, the polyether polyol composition A comprises a polyether polyol mixture and a combined auxiliary agent; the polyether polyol mixture includes: (a) a polyether polyol having a hydroxyl value of 18 to 80 mgKOH / g; the ethylene oxide content is 2-18 wt%; (b) a product obtained by copolymerization graft modification of polyether polyol, styrene and acrylonitrile, wherein the hydroxyl value is 18-80 mgKOH / g; the ethylene oxide content is 2-18 wt%; and (c) a polyether polyol having a molecular weight of 300 to 1000, a hydroxyl value of 160 to 350 mgKOH / g, and an ethylene oxide content of 0 to 5 wt%. The polyurethane foam material disclosed by the invention has the advantages of slow resilience and air permeability.

The invention discloses a preparation method of bis-hydroxyethyl bisphenol A ether, and belongs to the technical field of organic synthesis. The preparation method comprises the following steps: adding bisphenol A, a mixed acetate catalyst and a solvent into a reaction kettle, starting stirring, replacing nitrogen, heating to a reaction temperature, starting to introduce ethylene oxide, keeping the temperature after the ethylene oxide is added, and continuously reacting until the pressure is not reduced any more to obtain bisphenol A; cooling to a desolventizing temperature, desolventizing until no solvent is discharged, cooling, degassing, and discharging to obtain the bis (hydroxyethyl) bisphenol A ether, wherein the mixed acetate catalyst is prepared from calcium acetate, magnesium acetate and barium acetate; the solvent is methyl cyclohexane. According to the preparation method, the specific mixed acetate is adopted as the catalyst, methyl cyclohexane is adopted as the solvent, the excellent catalytic effect is achieved, the prepared bis-hydroxyethyl bisphenol A ether is high in content, low in hydroxyl value and light in color, and the solvent is small in toxicity and easy to recycle.

The purpose of the present invention is to provide a polyurethane foam which contains a plant-derived polyol in a starting material and has high resilience. The polyurethane foam is obtained from a composition containing a polyhydric alcohol and a polyisocyanate. The polyol contains a plant-derived polyol. The plant-derived polyol has a hydroxyl value of 130 mgKOH / g or less. And the isocyanate index is 91 or more. The elastic modulus of resilience according to JISK6400-3 is 25% or more.

The present application relates to a kind of core-shell type water-based hydroxyl acrylate microspheres emulsion and its preparation method and application. Core-shell water-based monodisperse acrylate emulsion is prepared by in-situ multi-stage variable speed drop method, including the following steps: core layer polymerization: after heating kettle bottom liquid, initiator solution is added, then multi-stage variable speed drop is added to core layer pre-emulsion containing core layer monomer, after adjusting pH using neutralizing agent, polyacrylate core layer emulsion is obtained;Shell polymerization: multi-stage variable speed drop is added to polyacrylate core layer emulsion containing shell pre-emulsion containing shell monomer and initiator solution, heat preservation, cooling, after reaction is completed, terminating agent is added, after adjusting pH using neutralizing agent, core-shell type water-based hydroxyl acrylate microspheres emulsion is obtained. The emulsion is used in exterior wall coating, wood coating or antirust coating field. Compared with prior art, the microspheres emulsion synthesized by the present application has the advantages of high solid content, high hydroxyl value, uniform particle size, etc.