摘要:
The invention is directed to a spectacle lens which contains an infrared absorbing agent, and which shows excellent infrared absorbing properties by minimizing deterioration and decomposition of the infrared absorbing agent, and as well as a method of producing such an optical lens. This infrared absorbing spectacle lens is formed by adding an infrared absorbing dye to a polyurethane resin obtained by addition polymerization of a prepolymer produced by reacting a polyisocyanate with a polyhydroxy compound, and an aromatic polyamine. The lens shows excellent infrared absorbing properties with no deterioration or decomposition of the infrared absorbing agent. It is possible to prevent deterioration of the infrared absorbing agent due to additives such as peroxides (including polymerization catalysts and initiators such as benzoyl peroxide), as well as increased absorption of visible light, which was difficult with conventional resin materials for molding. Also, because this lens can be molded at a relatively low temperature and it is not necessary to mold it at a temperature exceeding 250° C. as in the prior art, the infrared absorbing agent is less likely to deteriorate by heating.
摘要:
A door made of polyurethane, including a door body, the door body including a plurality of integrated plates stacked on one another for supporting. A method for preparing the door includes providing a mold, and spraying a parting agent inside the mold; heating the mold to a temperature of 30-70° C., spraying the parting agent, and placing a plurality of plates or a metal skeleton in the mold; mixing raw materials to obtain a mixture; injecting the mixture into the mold to cover the stacked plates, and curing for 30-90 min; demolding, transferring a product from the mold to a thermostatic chamber for shaping at a constant temperature; trimming uneven edges and surfaces of the product; and spraying a paint on the product.
摘要:
A curable composition comprising an isocyanate material; method of using this curable composition and fluid connection incorporating cured reaction products of this composition are provided.
摘要:
The invention relates to a curable composition comprising: at least one benzoxazine and at least one toughening additive which can be bound to the at least one benzoxazine in the curing process, characterized in that the toughening additive is distributed in the cured composition in form of discrete domains, and that at least 50% of the discrete domains related to the total amount of discrete domains have a maximum length in any direction of space in the range of 10 nm to 500 nm as determined by transmission electron microscopy (TEM).
摘要:
A biocompatible tissue-bonding adhesive composition having a polyol of functionality N. The polyol being terminated has at least one polyisocyanate in solution with at least (N−1) % of the solution having free polyisocyanate. N may be in the range 1.5-8. The polyol may be a branched polypropylene/polyethylene oxide copolymer.
摘要:
Process for producing a flame-retardant polyurethane foam of density from 5 to 50 g/L, by mixing (a) organic polyisocyanate with (b) polymeric compounds having at least two hydrogen atoms reactive toward isocyanates, (c) optionally chain extender and/or crosslinking agent, (d) flame retardant, (e) blowing agent, (f) catalysts, and optionally (g) auxiliary and additives to give a reaction mixture and permitting said reaction mixture to react completely, where the flame retardant (d) comprises expandable graphite and oligomeric organophosphorus flame retardant. The present invention further relates to a flame-retardant polyurethane foam which can be produced by a process of the invention, and also to the use of this foam in vehicles for acoustic insulation.
摘要:
A coating agent for hand painting application obtained by a urethane resin composition obtained by allowing a main agent (A) and a curing agent (B) to react. The main agent (A) containing: an isocyanate group-terminated prepolymer (b) having diphenylmethane diisocyanate bound to the termini of a polyol component (a) containing a long chain polyol (e) which contains at least a polyhydroxy functional product such as a trihydroxy or higher-hydroxy functional product and having a molecular weight of 200 or greater; and unbound diphenylmethane diisocyanate(c). The curing agent (B) containing: a crosslinking agent (g) obtained by a short chain polyol (f) having a molecular weight of less than 200; and a long chain polyol (h) having a molecular weight of 200 or greater.
摘要:
Structural adhesives are prepared from an elastomeric toughener that contains urethane and/or urea groups, and have terminal isocyanate groups that are capped with ketoxime compound. The adhesives have very good storage stability and cure to form cured adhesives that have good lap shear and impact peel strengths, even at −40° C.