A method minimizes emissions while spraying a mixture of a resin composition and a polyisocyanate onto a surface. The resin composition has a hydroxyl content of at least 400 mg KOH/g and includes a blowing agent that is a liquid under pressure, a first polyol, at least one additional polyol other than the first polyol, and optionally a catalyst, surfactant, and water. The mixture is sprayed onto the surface to form a polyurethane foam having a closed cell content of at least 90 percent. The mixture is also sprayed through a spray nozzle at a spray angle corresponding to a control spray angle of from 15 to 125 degrees measured at a pressure of from 10 to 40 psi using water as a standard. The step of spraying produces less than 50 parts of the polyisocyanate per one billion parts of air according to OSHA Method 47.

A polyurethane spraying system minimizes emissions of a polyisocyanate while spraying a mixture of a polyisocyanate and a resin composition onto a surface. The system includes a first reactant supply tank including the resin composition. The system also includes a second reactant supply tank including the polyisocyanate. The system further includes a non-gaseous pump that is coupled with the first and second reactant supply tanks, a mixing apparatus that is coupled with the first and second reactant supply tanks for mixing the resin composition and the polyisocyanate prior to spraying, and a particular spray nozzle that is coupled with the mixing apparatus. The polyurethane spraying system produces less than 50 parts of the polyisocyanate per one billion parts of air according to the NIOSH 5521 Impingement Method while spraying the mixture onto the surface.

A thermoplastic polyurethane precursor that can be used to prepare a polyurethane having a low initial yellowness index, high yellowing resistance, high thermal oxidative aging resistance, high hydrolysis resistance, and low fisheye. The thermoplastic polyurethane precursor includes a polyisocyanate, a chain extender, a polymer polyol, and a first auxiliary agent, wherein the first auxiliary agent includes: (d1) benzenepropanoic acid, 3,5-bis(1,1-dimethylethyl)-4-hydroxy-C7-C9 branched alkyl esters; (d2) phosphorous acid, mixed 2,4-bis(1,1-dimethylpropyl)phenyl and 4-(1,1-dimethylpropyl)phenyl triesters; (d3) 4-tert-butyl-2-(5-tert-butyl-2-oxo-3H-benzofuran-3-yl)phenyl-3,5-di-tert-butyl-4-hydroxybenzoate; and (d4) at least one of a compound of formula (I) and a compound of formula (II),

##STR00001##

wherein R1 is a C12 alkenyl;

##STR00002##

A polyurethane foam composition comprising: (a) an isocyanate compound; (b) one or more isocyanate reactive compounds at least one of the isocyanate reactive compounds comprises an aromatic polyester polyol compound comprising an imide moiety wherein the aromatic polyester polyol is the reaction product of: (i) a cyclic anhydride compound; (ii) a phthalic acid based compound, (iii) a primary amine compound, (iv) an aliphatic diol compound; (v) optionally, a high functionality, low molecular weight polyether polyol compound; (vi) optionally, a hydrophobic compound; and wherein the weight ratio of Component (i) to Component (ii) is from 1:24 to 24:1; and wherein the aromatic polyester polyol is liquid at 25 C. and comprises a hydroxy value ranging from about 30 to about 600; and (c) a blowing agent.

Disclosed are a foaming material, a thermal insulation cabinet, and preparation methods therefor. The foaming material comprises 100 parts of a combined polyol, 10-30 parts of a foaming agent composition, and 120-150 parts of an isocyanate. In the present invention, the type of the polyol used in a foaming system is adjusted in order to increase the content of a polyester polyol and reduce the content of a polyether polyol, such that the compressive strength of the foaming material is significantly improved without increasing or changing the injection amount.

The present invention relates to a selective process for producing polyurethane prepolymers, to the polyurethane prepolymers obtainable from this process, and also to a process for producing moisture-crosslinking silylated polymers, more particularly silane-functional hybrid polymers, and also to the use thereof in CASE sectors (coatings, adhesives, sealants and elastomers).

Disclosed are an anti-condensation composition, an anti-condensation liquid cooling plate, a preparation method and application thereof, the composition includes Component A and Component B, and a mass ratio of Component A to Component B is 100:100-103. Specifically, Component A is composed of the following components in parts by weight: 1-2 parts of melamine polyol, 25-30 parts of polyester polyol, 20-25 parts of fire-retardant polyester polyol; 5-10 parts of polyol used as a crosslinking agent; 15-20 parts of a fire retardant; 3-5 parts of a catalyst; 0.9-1.2 parts of silicone; 0.4-0.6 part of water; 8-12 parts of a foaming agent; 0.5-1 part of an auxiliary agent; 0.5-1 part of color paste; and Component B is isocyanate. The liquid cooling plate includes a liquid cooling plate substrate and anti-condensation material prepared by the anti-condensation composition. The anti-condensation composition can be applied to energy storage devices and new energy vehicles.

The present invention relates to a porous layer structure containing a base material and a polyurethane porous layer formed on the base material, wherein a moisture permeability A of the porous layer structure measured by JIS L1099 A-1 (calcium chloride method) is 2000 to 10000 g/(m.sup.2.Math.24 h), a moisture permeability loss rate obtained by a predetermined formula from a moisture permeability B of the base material alone measured by JIS L1099 A-1 (calcium chloride method) and the moisture permeability A is 75% or less, and a peel strength at a bonding surface between the base material and the polyurethane porous layer is 0.7 kgf/inch or more.

The present invention relates to a process for the production of a polyurethane foam having a density of 5 to 20 g/dm.sup.3. by mixing the following to give a reaction mixture: (a) polyisocyanates comprising PMDI, (b) compounds having at least two hydrogen atoms reactive toward isocyanate groups, comprising (b1) at least one polyether polyol obtained by alcoxylation of two or three functional starter molecule having a hydroxyl value of 210 to 400 mg KOH/g and (b2) at least one polyether polyol obtained by alcoxylation of an aliphatic diamine, (c) catalyst comprising (c1) at least one incorporable amine catalyst and (c2) at least catalyst comprising an urea structure, (d) blowing agent, comprising water, (c) optionally flame retardant and (f) optionally auxiliaries and additional substances, spraying the reaction mixture onto a substrate and allowing said reaction mixture to harden to give the polyurethane foam and wherein the reaction mixture comprises less than 1 part by weight of a phosphorous flame retardant. The resent invention is further directed to Polyurethane foam obtainable according to a process according to the present invention.

A composition for preparing a foamed polyurethane article is disclosed. The composition comprises (1) an isocyanate-reactive component and (2) an isocyanate component. The (1) isocyanate-reactive component comprises (A) an organopolysiloxane having an average of at least two carbinol functional groups per molecule and (B) a polyol. The (A) organopolysiloxane is present in an amount of from >10 to <99 wt. % based on the combined weight of the (A) organopolysiloxane and the (B) polyol. The (2) isocyanate component comprises (C) a polyisocyanate. The composition further comprises (D) a blowing agent, and (E) a catalyst. A foamed polyurethane article comprising the reaction product of the composition is also disclosed, along with use of the foamed polyurethane article.