206 results about "Hydroxyl value" patented technology

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 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.

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 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.

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 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 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.

A thermoplastic polyurethane resin elastomer is obtained by reacting an isocyanate compound (I), an aliphatic alcohol (II) having a number average molecular weight determined from the hydroxyl value of less than 300 and having only a hydroxyl group as a functional group, and a polyol (III) having a number average molecular weight determined from the hydroxyl value of not less than 300 and not more than 10,000. The isocyanate compound (I) includes not less than 90 mol % in total of an aliphatic isocyanate compound containing two isocyanate groups and / or an alicyclic isocyanate compound containing two isocyanate groups. The aliphatic alcohol (II) includes not less than 90 mol % of a C12 or lower aliphatic diol. The polyol (III) includes not less than 80 mol % of a copolymerized polycarbonate diol (IIIA) including a linear repeating structural unit represented by formula (A) and a repeating structural unit represented by formula (B).

The invention discloses waterborne polyester as well as a preparation method and application thereof. The preparation method comprises the following steps: putting an intermediate compound into a pre-polycondensation product to carry out polycondensation reaction; wherein the pre-polycondensation product is a product obtained by adding an auxiliary agent into an ester and carrying out polycondensation reaction until the hydroxyl value reaches 80 mgKOH / g-100 mgKOH / g, the chemical structural formula of the ester is shown in the specification, R1, R2 and R3 are independently selected from C4-C12 alkyl groups or aryl groups, R4 and R5 are independently selected from C2-C9 alkyl groups; the chemical structural formula of the intermediate compound is shown in the specification, R6 is C3-C6 alkyl, and R7 is methyl or ethyl. The super-hydrophilic coating prepared from the water-based polyester prepared by the method has super-hydrophilicity, high wear resistance and long service life, and is suitable for the fields of building glass, medical equipment, automobile glass, electronic screens and the like which require antifogging, self-cleaning and durability requirements.

The present invention provides a film-forming composition that can easily remove a film layer from a general-purpose plastic substrate using a simple method. The film-forming composition of the present invention is a removable film-forming composition used to form a film on the surface of a substrate (A) directly or through another layer that is removable by treatment in an alkaline solution. The film-forming composition contains a urethane resin having a hydroxyl value, a weight-average molecular weight of 45,000 or greater, and a number-average molecular weight of 10,000 or greater. The hydroxyl value in the film-forming composition is preferably 1.0 mgKOH / g to 30.0 mgKOH / g.

This invention relates to the field of slow rebound foam technology, and particularly to a slow rebound foam based on waste PET polyether polyol, and its preparation method. The waste PET-based polyether polyol is obtained from bis(2-hydroxyethyl) terephthalamide obtained by aminolysis of waste PET as a starting material. This not only enables the recycling and reuse of waste PET, but also allows it to be used as a foaming material for slow rebound foam. The composite polyether is composed of polyether polyol I, polyether polyol II, waste PET-based polyether polyol, and polymer polyol. By adjusting and controlling parameters such as functionality, molecular weight, hydroxyl value, viscosity, and propylene oxide content of the waste PET-based polyether polyol, it can be stably stored at room temperature without crystallization. When used as the soft segment of slow rebound foam, it significantly improves the low-temperature resistance of the slow rebound foam, avoiding the problems of slow rebound polyurethane foam hardening and becoming difficult to cut in winter, as well as poor resilience.

A polyether polyol combination for compression-resistant slow-rebound polyurethane foam, polyurethane foam and a preparation method thereof, comprising the following raw materials in parts by weight: polyether polyol A 60-90 parts, polyether polyol B 5-20 parts, polyether polyol C 10-20 parts, silicone oil surfactant 1.5-2.5 parts, chemical foaming agent 2.5-3.5 parts, amine catalyst 0.3-0.8 parts; polyether polyol A is a high-EO polyether polyol, with a hydroxyl value of 30-50 mg KOH / g, a functionality of 3, an EO content of 70%-80%, a primary hydroxyl group content of 40%-60%, and is prepared by DMC catalyst catalysis; polyether polyol B is a low-EO polyether polyol, with a molecular weight of 2500-3500, a hydroxyl value of 50-80 mg KOH / g, a functionality of 3, an EO content of 5%-10%, a PO content of 85%-92%, and is prepared by DMC catalyst catalysis; polyether polyol C is an EO-free polyether polyol, prepared by DMC catalyst catalysis. The polyurethane slow-rebound foam prepared by the application has good recovery time and excellent compression resistance, and is easy to implement and simple to operate.

Coating compositions, methods of producing a cured coating, and articles coated with a cured coating are provided. In an exemplary embodiment, a coating composition includes a crosslinking agent, an acrylic resin, a catalyst, and a catalyst blocker that blocks the catalyst. The crosslinking agent includes an alkylated melamine, and the acrylic resin has a hydroxyl value of from about 5 to about 110 milligrams potassium hydroxide per gram of acrylic resin. The catalyst includes a sulfonic acid, and the catalyst blocker includes an amine with a boiling point of about 300 degrees Celsius or higher.

The present disclosure provides aqueous dispersions of hydroxyl-functional core-shell particles. The particle core comprises a (meth) acrylic polymer and the shell comprises a polyurethane polymer. And the mass ratio of the core to the shell ranges from 20: 80 to 80: 20. The shell has a hydroxyl number of from 1 mg KOH / g to 40 mg KOH / g and an acid number of from 10 mg KOH / g to 60 mg KOH / g. The polyurethane is prepared from (a) a first prepolymer having a polymerizable ethylenically unsaturated group at one end and an active hydrogen functional group at the opposite end; (b) a second prepolymer having a polymerizable ethylenically unsaturated group at each end thereof; and (c) a third prepolymer having an active hydrogen functional group at each end thereof. Also provided are aqueous curable film-forming compositions, multi-layer coated substrates, and methods of improving adhesion and / or cohesion between coatings on a substrate.

A powder coating composition comprising an acid functional polyester resin A formed by reacting one or more polyol constituents, wherein at least 90 mole % of the polyols constituents is neopentylglycol, with one or more poly acid constituents wherein at least 87 mole % of the poly acid constituents is isophthalic acid (IPA); wherein polyester resin A has an Acid Number (AN) of between 20 and 90 mg KOH / g; and a hydroxyl value of less than 50, preferably less than 15 mg KOH / g; a glycidyl functional acrylic resin B having a weight average molecular weight of between 2500 and 7000; a curing catalyst C capable of catalyzing the reaction between the polyester resin A and the acrylic resin B; and optionally β-hydroxyalkylamide D.

The present invention relates to the technical field of fine chemical synthesis. Disclosed is a method for synthesizing bisphenol A polyether. In the synthesis method, bisphenol A is used as an initiator, and a composite catalyst consisting of a carbonate, an amine compound, and an organic phosphine is used to catalyze a ring-opening polymerization reaction of an alkylene oxide, thereby obtaining a bisphenol A polyether having a low hydroxyl value and a light color. The problems in the prior art that a product is prone to isomerization and decomposition under the action of a strong base catalyst, and that the color of the product darkens are effectively solved.

The present disclosure provides a water-based paint composition which is a single-component, has excellent storage stability, and forms a coating film having excellent workability, crack resistance, and damage resistance. The water-based paint composition of the present disclosure contains a coating film-forming resin (A), a crosslinking agent (B), a sulfonic acid compound (C), and an amine compound (D), the coating film-forming resin (A) contains an acrylic resin (A1), the hydroxyl value of the coating film-forming resin (A) is 5 mgKOH / g or more and 35 mgKOH / g or less, the crosslinking agent (B) contains a peralkyl melamine resin (B1), and the neutralization rate of the acid group of the sulfonic acid compound (C) based on the amine compound (D) is 100% or more and 1,300% or less.

The invention discloses ink as well as a preparation method and application thereof, and belongs to the technical field of ink. The ink provided by the invention comprises a main agent, a silane coupling agent and a curing agent, the main agent comprises polycarbonate resin and aldehyde ketone resin; the hydroxyl value of the aldehyde ketone resin is 30 to 150 mgKOH / g; the mass ratio of the polycarbonate resin to the aldehyde ketone resin is (5-20): (55-70). When the ink provided by the invention is applied to the surface of a metal coating, a relatively high leveling effect is achieved, and the adhesive force of the obtained ink coating and the metal coating is excellent. The invention also provides a preparation method and application of the ink.

The present invention provides a wax composition for cosmetics that can suppress the deterioration of storage stability of cosmetics in low-temperature, low-humidity or high-temperature, high-humidity environments, and improve the washability of cosmetics. [Solution] A cosmetic wax composition containing an ester of a linear saturated fatty acid having 14 to 26 carbon atoms and pentaerythritol, wherein the ester contains tetraester T, the content of tetraester T in the wax composition is 80 to 98% by mass, the wax composition has an acid value of 2 mg KOH / g or less, a hydroxyl value of 1 mg KOH / g or more and 10 mg KOH / g or less, and a melting point of 75°C or higher.

The invention relates to the field of separation membranes, and discloses a caustic material separation membrane and a preparation method thereof, the caustic material separation membrane comprises a porous carrier and a cross-linking layer on the surface of the porous carrier; the cross-linking layer is prepared by cross-linking a pre-cross-linking product of a polyol compound and an anionic polymer with a cross-linking agent; the hydroxyl value of the polyhydric alcohol compound is 400 to 2000 mgKOH / g; the anionic polymer at least comprises one acidic group; the cross-linking agent at least comprises one reactive group; the reactive group is one of carboxyl, aldehyde group and amido. According to the invention, an adjustable semi-interpenetrating network cross-linking layer is formed on the surface of the porous carrier through the cross-linking reaction of the polyol compound and the anionic polymer with the cross-linking agent, so that the separation membrane can be used in caustic feed liquid for a long time, the separation precision is adjustable, and the scale inhibition performance is good.

The application belongs to the technical field of carbon black production, and particularly relates to a high-dispersibility acetylene carbon black preparation method and particles. Raw material acetylene carbon black, H2O2 solution and CH3COOOH solution are mixed to form a mixture; the mass ratio of the H2O2 solution, the CH3COOOH solution and the raw material acetylene carbon black is (2 to 4):(4 to 6):25; the mixture is slowly heated to a predetermined temperature and then kept for a predetermined time to prepare high-dispersibility acetylene carbon black; the dispersibility value of the prepared high-dispersibility acetylene carbon black is 16.9, and the hydroxyl value is 0.34; no dispersant or auxiliary agent is introduced during preparation, the prepared high-dispersibility acetylene carbon black has no impurities and has high purity; the resistivity of the high-dispersibility acetylene carbon black prepared by the method is 1.5 omega*m, and compared with the resistivity 3 omega*m of high-quality acetylene carbon black on the market, the high-dispersibility acetylene carbon black has high dispersibility and high conductivity.

The invention discloses a low-temperature foaming forming method of all-water foaming combined polyether, and relates to the technical field of foaming forming of all-water foaming combined polyether. By optimizing a premix formula and accurately controlling process parameters (such as temperature, pressure and stirring conditions), efficient and uniform foaming reaction is realized in a low-temperature (10-30 DEG C) environment. According to the method, energy consumption and equipment requirements are remarkably reduced, meanwhile, the density consistency, compression strength and durability of foam products are improved, and the harsh application requirements in the fields of building energy conservation, household appliance heat preservation and the like are met. The polyether polyol with a specific hydroxyl value and the catalyst and the stabilizer with low addition amount are adopted, so that the foaming activity at low temperature is ensured; by combining nitrogen protection closed stirring, oxidation side reaction is prevented; and through a constant-temperature mold and gradient cooling shaping, a foam microstructure is optimized, internal stress is reduced, and finally a product with high dimensional precision and surface smoothness is obtained.

The invention relates to polyether sponge, a preparation method thereof and application of the polyether sponge in preparation of automobile tire sponge. Comprising the following preparation raw materials in parts by weight: 20-50 parts of isocyanate, 40-60 parts of polyether polyol A, 8-18 parts of bisphenol A glycol ether, 8-18 parts of polyether polyol B, 1-5 parts of modified expandable graphite, 0.1-0.6 part of a first catalyst, 1-5 parts of a foaming agent and 0.5-1 part of an antioxidant. Wherein the functionality degree of the polyether polyol A is 4.5 to 6, the hydroxyl value of the polyether polyol A is 20 to 30 mgKOH / g, and the number-average molecular weight of the polyether polyol A is 9000 to 12000 g / mol, and the polyether polyol B is vinyl polymer grafted and modified polyether polyol; the problem that expansible graphite is poor in dispersity is solved, the elasticity, strength and flame retardance of the polyether sponge are improved, and the polyether sponge is suitable for reducing tire noise generated when an automobile runs at a high speed.

The invention relates to the technical field of adhesives, in particular to an adhesive as well as a preparation method and application thereof. Comprising a component A and a component B. The component A comprises, by weight, 30-40 parts of castor oil, 5-20 parts of polyether polyol, 0.8-3 parts of fumed silica, 0.1-1 part of glycerin, 40-60 parts of a filler, 2-5 parts of a molecular sieve, 2-5 parts of a thixotropic agent, 0.1-0.8 part of a chain extender and 0.1-0.8 part of an auxiliary agent. The component B comprises isocyanate; the viscosity of the polyether polyol at 25 DEG C is less than or equal to 4000 mPas, and the hydroxyl value is 15-40 mgKOH / g. The prepared adhesive has excellent operable time (more than 40 min), sagging displacement difference (less than or equal to 1 cm), tensile shear strength (more than or equal to 10 MPa) and colloid hardness (more than or equal to 80).

The invention relates to solvent-borne one-pack clearcoat material, characterized in that it comprises i.) one or more hydroxy functional polymers (A), at least one of which is a poly(meth)acrylate (A1), possessing a) a glass transition temperature below -15 °C as determined by differential scanning calorimetry; b) a hydroxyl value in the range from 130 mg KOH / g to 300 mg KOH / g; and c) a weight-average molecular weight determined by gel permeation chromatography using a polystyrene standard; ii.) one or more crosslinking agents (B), at least one of which is a melamine-formaldehyde resin possessing methoxymethyl groups (B1); and iii.) a catalyst system (C) comprising one or more amine-blocked sulfonic acids (C1); and one or more phosphoric acid catalysts (C2). The invention further related to a multilayer coating system comprising a clearcoat layer formed from said clearcoat material, a method of preparing such multilayer coating system and a thus coated substrate, as well as the use of the solvent-borne one-pack clearcoat material for coating uncoated or precoated substrates, preferably vehicle bodies or parts thereof in OEM or repair coating.

This polyurethane foam is the reaction product of a raw material composition containing polyether polyol and an isocyanate, the polyether polyol containing a polyether polyol (A) having a hydroxyl value of 100 mgKOH / g or less and an ethylene oxide content of 50 mass% or more. The content of the polyether polyol (A) is 65-75 mass% with respect to the total amount of the polyether polyol, and the density of the polyurethane foam is 110 kg / m3 or more.

This invention discloses modified bio-based polyether polyols and their preparation methods, relating to the field of polyether polyol technology. The invention modifies the molecular structure of epoxy greases by grafting, introducing triazine ring compounds for ring-opening modification, and simultaneously combining other initiators to increase its functionality, thereby increasing the degree of crosslinking of its molecular structure during application. After epoxide alkane polymerization modification and molecular weight adjustment, modified bio-based polyether polyols with appropriate hydroxyl values ​​and viscosities are obtained.

The present invention discloses a high-solids, three-coat, one-bake mid-coat for automobiles based on a water-based acrylic resin. The mid-coat is characterized by being a single-component paint and comprising, by weight, 10-25 parts of a water-based acrylic emulsion, 5-15 parts of a water-based polyurethane dispersion B, 5-15 parts of a water-based polyurethane dispersion C, and 30.1-70.4 parts of additives. The additives include 0.1-0.4 parts of an inorganic rheological modifier. The water-based polyurethane dispersion B has a hydroxyl value of less than 5 mgKOH / g and an acid value of 20-35 mgKOH / g; the water-based polyurethane dispersion C has a hydroxyl value of 110-160 mgKOH / g. The mid-coat exhibits high base solids, low coating consumption, and low VOC emissions, while maintaining excellent coating appearance, superior mechanical properties, and ease of application. The present invention also discloses applications of the mid-coat.