阅读说明：本技术 减少聚氨酯泡沫中醛排放的方法 (Method for reducing aldehyde emissions in polyurethane foams ) 是由 唐铮铭 邹健 冯少光 佐佐木裕司 陈洪亮 李海英 张德刚 张萍 于 2018-08-02 设计创作，主要内容包括：聚氨酯泡沫通过固化含有以下的反应混合物制造：芳香族多异氰酸酯、至少一种平均官能度为至少2并且每个异氰酸酯反应性基团的当量为至少200的异氰酸酯反应性材料、至少一种发泡剂、至少一种表面活性剂和至少一种催化剂、数均分子量为175至450的聚乙烯胺混合物和碱金属、鏻或铵亚硫酸盐。如此生产的泡沫排放低水平的甲醛、乙醛、丙烯醛和丙醛。(Polyurethane foams are made by curing a reaction mixture containing: an aromatic polyisocyanate, at least one isocyanate-reactive material having an average functionality of at least 2 and an equivalent weight per isocyanate-reactive group of at least 200, at least one blowing agent, at least one surfactant and at least one catalyst, a polyvinylamine mixture having a number average molecular weight of 175 to 450, and an alkali metal, phosphonium or ammonium sulfite. The foam so produced emits low levels of formaldehyde, acetaldehyde, acrolein, and propionaldehyde.)

1. A process for producing a polyurethane foam comprising forming a reaction mixture comprising: an aromatic polyisocyanate, at least one isocyanate-reactive material having an average functionality of at least 2 and an equivalent weight per isocyanate-reactive group of at least 200, at least one blowing agent, at least one surfactant and at least one catalyst, and curing the reaction mixture in the presence of (i) a polyvinylamine mixture having a number average molecular weight of 175 to 450 and (ii) an alkali metal, ammonium or phosphonium sulfite to form the polyurethane foam.

2. A method for reducing aldehyde emissions of a polyurethane foam, comprising: a) combining (i) a polyvinylamine mixture having a number average molecular weight of 175 to 450 and (ii) an alkali metal, ammonium or phosphonium sulfite with at least one isocyanate-reactive material having an average functionality of at least 2 and an equivalent weight per isocyanate-reactive group of at least 200 to form a mixture, and then b) combining the mixture from step a) with at least one organic polyisocyanate and curing the resulting reaction mixture in the presence of at least one blowing agent, at least one surfactant and at least one catalyst to form a polyurethane foam.

3. The process of claim 1 or 2, wherein the number average molecular weight of the polyvinylamine mixture is at least 225 and at most 325.

4. The method of any preceding claim, wherein the polyvinylamine mixture comprises a compound having any of the following structures I and II:

wherein x and y are each a positive number, z is zero or a positive number, and each R is independently hydrogen, vinylamine, or linear, branched, and/or cyclic polyvinylamine.

5. The method of any one of the preceding claims, wherein the alkali metal, ammonium, or phosphonium sulfite is sodium bisulfite.

6. The method of any preceding claim wherein the polyvinylamine mixture having a number average molecular weight of 175 to 450 is present in an amount of 0.03 to 0.25 parts by weight per 100 parts by weight of at least one isocyanate-reactive compound having at least two isocyanate-reactive groups per molecule and an equivalent weight per isocyanate-reactive group of at least 200.

7. The method of any preceding claim, wherein the alkali metal, ammonium, or phosphonium sulfite is present in an amount of 0.025 to 0.25 parts by weight per 100 parts by weight of at least one isocyanate-reactive compound having at least two isocyanate-reactive groups per molecule and an equivalent weight per isocyanate-reactive group of at least 200.

8. The method of any preceding claim, wherein the reaction mixture is cured in the presence of an antioxidant.

9. The method of claim 12, wherein the antioxidant is a phenolic compound.

10. The method of claim 8 or 9, wherein the antioxidant is present in an amount of 0.2 to 1.5 parts by weight per 100 parts by weight of at least one isocyanate-reactive compound having at least two isocyanate-reactive groups per molecule and an equivalent weight per isocyanate-reactive group of at least 200.

11. A polyurethane foam made according to the method of any one of claims 1-10.