Rigid polyurethane foam based on low-vacuum-degree closed space as well as preparation method and application of rigid polyurethane foam

A polyurethane and rigid foam technology, applied in the field of foamed polyurethane materials, can solve the problems of increasing the foam curing time, reducing the production efficiency of the refrigerator, and poor filling of the box, so as to reduce the energy consumption of the refrigerator, reduce the range, and stabilize the thermal conductivity Effect

Active Publication Date: 2022-01-14
WANHUA CHEM NINGBO RONGWEI POLYURETHANE +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

First of all, increasing the content of surfactant can improve the foam stabilizing performance of the foam, but its compatibility is poor, and it is easy to cause turbidity or even delamination of the composite material; secondly, lowering the mold temperature can reduce the volatilization of the blowing agent, but it seriously affects the foam Fluidity and adhesion, resulting in poor filling and debonding of the box; thirdly, reducing the catalyst content can make the foam flow gently and reduce bubbles, but it needs to increase the foam curing time and reduce the production efficiency of the refrigerator; finally, reduce low boiling point foaming If the agent content is reduced, the strength will decrease, and the pouring volume will need to be increased, which will increase the cost of the foam

Method used

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  • Rigid polyurethane foam based on low-vacuum-degree closed space as well as preparation method and application of rigid polyurethane foam
  • Rigid polyurethane foam based on low-vacuum-degree closed space as well as preparation method and application of rigid polyurethane foam
  • Rigid polyurethane foam based on low-vacuum-degree closed space as well as preparation method and application of rigid polyurethane foam

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0085] Preparation of o-TDA polyether polyol:

[0086] 1) Weigh 280kg of o-TDA into the reactor, add 200kg (Boc) 2 O, heated to 50°C, stirred for 2h, cooled to normal temperature, and the surface liquid was precipitated to obtain the intermediate product A;

[0087] 2) Take all the intermediate product A, add 2200kg of propylene oxide (PO), stir at 135°C at high temperature, react for 4 hours, cool, volatilize excess propylene oxide, and obtain intermediate product B;

[0088] 3) Add 200kg of trifluoroacetic acid (TFA), control the temperature at 30°C, and fully stir for 3 hours to hydrolyze the -NBoc group to obtain the required -NH functional group, then add 200kg of dichloromethane to remove excess trifluoroacetic acid And its reaction product with -NBoc was extracted. The o-TDA polyether polyol of the present invention is obtained.

[0089] Cause (Boc) 2 The -NH groups protected by O are in different positions, and the conversion rate is not high. Therefore, the -NH grou...

Embodiment 2

[0092] Preparation of o-TDA polyether polyol:

[0093] 1) Weigh 170kg of o-TDA into the reactor, add 150kg (Boc) 2 O, heated to 60°C, stirred for 3h, cooled to normal temperature, and the surface liquid was precipitated to obtain the intermediate product A;

[0094] 2) Take all the intermediate product A, add 1000kg of propylene oxide (PO), stir at 145°C at high temperature, react for 2 hours, cool, and volatilize excess propylene oxide to obtain intermediate product B;

[0095] 3) Add 150kg of trifluoroacetic acid (TFA), control the temperature at 40°C, and fully stir for 4 hours to hydrolyze the -NBoc group to obtain the required -NH functional group, then add 150kg of dichloromethane to remove excess trifluoroacetic acid And its reaction product with -NBoc was extracted. The o-TDA polyether polyol of the present invention is obtained.

[0096] Through detection, the hydroxyl value of the synthesized o-TDA polyether polyol is 598 mgKOH / g, the viscosity is 432,799 cps, the...

Embodiment 3

[0098] Preparation of o-TDA polyether polyol:

[0099] 1) Weigh 175kg of o-TDA into the reactor, add 250kg (Boc) 2 O, heated to 40°C, stirred for 1.5h, cooled to room temperature, and the surface liquid was precipitated to obtain the intermediate product A;

[0100] 2) Take all the intermediate product A, add 1500kg of propylene oxide (PO), stir at 125°C at high temperature, react for 4 hours, cool, volatilize excess propylene oxide, and obtain intermediate product B;

[0101] 3) Add 250kg of trifluoroacetic acid (TFA), control the temperature at 20°C, and stir thoroughly for 2 hours to hydrolyze the -NBoc group to obtain the required -NH functional group, then add 250kg of dichloromethane to remove excess trifluoroacetic acid And its reaction product with -NBoc was extracted. The o-TDA polyether polyol of the present invention is obtained.

[0102] Through detection, the hydroxyl value of the synthesized o-TDA polyether polyol is 502 mgKOH / g, the viscosity is 357,356 cps, ...

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Abstract

The invention provides rigid polyurethane foam based on low-vacuum-degree closed space as well as a preparation method and application of the rigid polyurethane foam. The rigid polyurethane foam takes high-viscosity polyether polyol as a main raw material, and the polyether polyol has the characteristics of high viscosity and strong gas adsorption capacity, so the stability of a foam wall in a flowing process can be effectively improved, and bubbles on the surface of the foam are reduced. In a closed space with a certain vacuum degree and an environment in which the absolute value of the pressure of a foaming layer of a box body is lower, a system containing a high foaming agent content or a low-boiling-point foaming agent is high in foam flowing speed and easy to undergo shearing with an inner container and a metal shell, and meanwhile, air is wrapped in a bending process so as to form bubbles, so a technical problem in the prior art can be effectively solved by using the system.

Description

technical field [0001] The invention belongs to the field of foamed polyurethane materials, and in particular relates to a method for preparing hard polyurethane foam based on a low-vacuum enclosed space. Background technique [0002] Polyurethane rigid foam is widely used in refrigerators, freezers, containers and other fields due to its advantages of light weight, high strength and easy molding. It has developed rapidly and has undergone many technical updates. methane) system 38-40kg / m 3 Core density, to 34-36kg / m of CP system 3 , and then to 30.5-32.5kg / m of CP+245FA / LBA system 3 , and then to 29.5-30.5kg / m of CP+245FA / LBA+134a / 152a 3 . The core density is getting lower and lower. On the one hand, it can reduce the use of foaming materials and reduce the cost of foam. At the same time, the reduction of core density can also shorten the curing time of the box and reduce the thermal conductivity of the foam. [0003] As the competition among global refrigerator compan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/48C08G18/50C08G65/26C08J9/14C08G101/00C08L75/12C08L75/08
CPCC08G18/482C08G18/5027C08G18/503C08G65/2627C08J9/141C08J9/144C08J9/146C08J9/149C08J2375/12C08J2375/08C08J2203/14C08J2203/162C08J2203/182C08J2205/10C08J2203/142C08J2203/202
Inventor 钟仁升陈文靖叶俊王琭朱霞林
Owner WANHUA CHEM NINGBO RONGWEI POLYURETHANE
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