Check patentability & draft patents in minutes with Patsnap Eureka AI!

Method for preparing rigid polyurethane foam

A technology of rigid polyurethane and polyurethane is applied in the field of preparing rigid polyurethane foam, which can solve the problems of sacrificing the toughness of rigid foam and reducing the later expansion of foam.

Pending Publication Date: 2021-12-07
COVESTRO DEUTSCHLAND AG
View PDF2 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Attempts have also been made to reduce foam stiffness by increasing the average degree of crosslinking of the active hydrogen reactive components, e.g. by replacing the long chain polyols used to impart appropriate flexibility to rigid foams with short chain polyether polyols with high crosslinking degrees. Post-expansion, but at the expense of rigid foam toughness and even foam-to-substrate / surface adhesion

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for preparing rigid polyurethane foam
  • Method for preparing rigid polyurethane foam

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0091] Description of performance testing method

[0092] Core density refers to the foam center density tested when there is excessive filling in the mold used in the production of polyurethane composite panels, that is, the molded foam core density; the test method is based on ISO 291:1997;

[0093] Post-expansion rate: After mixing components A and B, pour them quantitatively into a temperature-controlled metal square mold with a filling density of 50kg / m3 and close the mold. After the set curing time of 7 minutes, open the mold and take out the foam block, and 3 minutes after demoulding, place the foam block on a thickness gauge to measure the real-time thickness value t at the center of the foam block. The thickness expansion percentage ((t-100) × 100%) relative to the mold thickness of 100mm is the post-expansion rate (post-expansion) of the present invention;

[0094] Foam / substrate adhesion: After mixing components A and B, pour them quantitatively into a metal square...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention relates to a method for preparing rigid polyurethane foam, the rigid polyurethane foam prepared by the method and application of the rigid polyurethane foam in a polyurethane composite material.

Description

technical field [0001] The invention relates to a method for preparing rigid polyurethane foam, the rigid polyurethane foam prepared by the method and its application in molding rigid polyurethane composite materials and heat insulation materials. Background technique [0002] As a mature technical product, rigid polyurethane foam has been widely used in construction, transportation, home appliances, sports equipment and many other fields. It usually combines isocyanate components (such as PAPI) with active hydrogen-containing substances (such as polyether polyols, polyester polyols, small molecule polyols, small molecule amino polyols, small molecule polyol amines, etc.), surface active Agents, catalysts (such as tertiary ammonia, quaternary ammonium salts, alkali metal carboxylates, etc.), foaming agents (such as water, pentane, hydrofluorocarbons, vinyl hydrochlorofluorocarbons, etc.), after mixing, spraying, pouring Or pouring and other processes to form a rigid foam. ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): C08G18/66C08G18/48C08G18/50C08G18/32C08L75/08C08J9/14C08G101/00
CPCC08G18/6688C08G18/482C08G18/5021C08G18/5027C08G18/4883C08G18/3281C08J9/141C08J2203/14C08J2375/08C08G18/4829C08G18/4816C08G18/5024C08G18/4208C08G18/4018C08G18/6655C08G18/1816C08G18/225C08G18/2036C08G18/7664C08G2330/00C08G2110/0058C08G2110/0025C08J2375/04C08J2205/10
Inventor 童俊
Owner COVESTRO DEUTSCHLAND AG
Features
  • R&D
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com