摘要:
This invention relates to rigid polyurethane foams which are co-blown with a mixture of a hydrocarbon blowing agent and a halogenated olefin blowing agent. This invention also relates to a process for preparing these rigid polyurethane foams, and to an isocyanate-reactive component containing a polyol blend and the mixture of blowing agents. Phase stable isocyanate-reactive blends are also described.
摘要:
The invention generally pertains to the use of polyurethane foam blown by at least one blowing agent having a boiling point at atmospheric pressure of between ~5°C to ~50°C, including miscible blends thereof, which passes all United States Coast Guard Title 33, Part 183 specifications wherein the buoyant force of the froth polyurethane or polyisocyanurate foam is not reduced more than 5% after exposure to being immersed in a fully saturated gasoline vapor atmosphere, in reference fuel B, in reference oil No. 2, and in a 5% solution of Na 3 PO 4 .
摘要翻译:本发明一般涉及使用由至少一种沸点大气压在-5℃至50℃之间的发泡剂吹制的聚氨酯泡沫,包括其混溶混合物,其通过了所有美国海岸警卫队标题33 第183部分规定,其中泡沫聚氨酯或聚异氰脲酸酯泡沫的浮力在暴露于完全饱和的汽油蒸气气氛中,在参考燃料B中,在参考油No.2中不降低超过5% 5%Na 3 PO 4溶液。
摘要:
The invention relates to an extrusion process for the production of expandable vinyl aromatic polymer granulate comprising mixing first and second additives with first and second polymer components, respectively, in dedicated mixers.
摘要:
강산리그닌, 폴리올 및 이소시아네이트를 포함하는 조성물의 중합 생성물인 경질 폴리우레탄 폼 및 이를 제조하는 방법에 관한 것이다. 바이오매스 유래되는 재료인 리그닌을 사용하여 추가적인 화학적 개질 없이도 폴리올의 일부를 대체할 수 있고, 우수한 물성을 지닌 경질 폴리우레탄 폼을 제조할 수 있다.
摘要:
The process of foaming a polyolefin, e.g., polyethylene, composition using as a nucleator a combination an azodicarbonamide (ADCA) and a fluororesin at a ADCA: fluororesin weight ratio of 60:40 to 20:80. The synergic effect between these two nucleating agentsresults in a higher nuclei density and a foamed product with a smaller cell size as compared to processes using and products produced by the use of neat PTFE or neat ADCA alone as the nucleating agent.
摘要:
Disclosed are azeotropic or azeotrope-like compositions containing Z-l,l,l,4,4,4-hexafluoro-2-butene and methyl perfluoropropyl ether. Also disclosed is a process of using the azeotropic or azeotrope-like composition as a blowing agent for preparing a thermoplastic or thermoset foam. Also disclosed is a process of using the azeotropic or azeotrope-like composition as a refrigerant for producing cooling or heating. Also disclosed is a process of using such azeotropic or azeotrope-like compositions as solvents. Also disclosed is a process of using the azeotropic or azeotrope-like composition as a propellant for producing an aerosol. Also disclosed is a process of using such azeotropic or azeotrope-like compositions as heat transfer media. Also disclosed is a process of extinguishing or suppressing a fire by using such azeotropic or azeotrope-like compositions. Also disclosed is a process of using such azeotropic or azeotrope-like compositions as dielectrics.
摘要:
A storage stable isocyanate-reactive composition has ethylene oxide content from 1 wt% to 50 wt%, based on the total weight of an isocyanate-reactive component that includes a polyol component, a catalyst component, and a blowing agent component. The polyol component includes at least one polyol, the catalyst component includes at least one amine catalyst, and the blowing agent component includes at least one hydrohaloolefin based blowing agent. The isocyanate-reactive component is storable at least at one of room temperature and a higher temperature for a period of at least 1 day with a less than 10 second change in gel time when reacted with an isocyanate component at an isocyanate index from 100 to 150, compared to when the same isocyanate-reactive component is stored for a period of less than 1 day at room temperature and reacted with the same isocyanate component at the same isocyanate index from 100 to 150.