Rigid polyurethane foam and preparation method thereof

A polyurethane rigid foam and foam technology, applied in the field of foam, can solve the problems of shortening demoulding time, etc., and achieve the effect of avoiding excessive expansion rate, low expansion rate and excellent strength

Active Publication Date: 2020-09-11
上海抚佳精细化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, in the prior art, there is no record of a plan that can effectively shorten the demoulding time and increase production capacity under the premise of ensuring that the foam products in the refrigerator industry meet the physical properties such as thermal conductivity, fluidity, and expansion rate.

Method used

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  • Rigid polyurethane foam and preparation method thereof
  • Rigid polyurethane foam and preparation method thereof
  • Rigid polyurethane foam and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] A kind of polyurethane rigid foam, its raw material is as follows:

[0037] Polyether polyol composition: 100 g. Among them, polyether A is a Mannich polyether provided by Jiahua Chemical (Binzhou) Co., Ltd., and the addition amount is 10 g. Polyether A is prepared by reacting Mannich base as an initiator with propylene oxide. Mannich base is obtained by reacting phenol, formaldehyde and diethanolamine, and the mass ratios are 20%, 34% and 46% respectively; the preparation method is to add 37% formaldehyde aqueous solution to diethanolamine, and react at about 50°C for 1-2h , then heat up to about 90°C, vacuum dehydrate, add phenol, and react at about 85°C for 2 hours; the mass ratio of Mannich base to propylene oxide is 3:1; the functionality of polyether A is 5, and the hydroxyl value is 530mgKOH / g. Polyether B is prepared by reacting sucrose and glycerol as co-initiators with propylene oxide. The mass ratio of sucrose, glycerol and propylene oxide is 20:8:72, the ...

Embodiment 2

[0048] Polyether polyol composition: 100 g. Among them, polyether A is the same as polyether A in embodiment 1, and the addition amount is 15g; polyether B is the same as polyether B in embodiment 1, and the addition amount is 25g; polyether C and the polyether B in embodiment 1 Ether C is the same, with an added amount of 55 g; polyether D is the same as the polyether D in Example 1, with an added amount of 5 g.

[0049] Catalyst: PC5 0.25g, PC8 1.8g.

[0050] Silicone oil: B8462 2.2g.

[0051] Water: 2.1 g.

[0052] Pentane blowing agent: 15g of cyclopentane and isopentane, the mass ratio of cyclopentane and isopentane is 70:30.

[0053] Polyisocyanate: PM200 150g.

[0054] The preparation method of above-mentioned rigid polyurethane foam comprises the steps:

[0055] (1) After weighing the above-mentioned combined polyether alcohol, catalyst, silicone oil and water, fully mix to obtain dry white material;

[0056] (2) Add pentane into the dry white material, mix well,...

Embodiment 3

[0059] Polyether polyol composition: 100 g. Among them, polyether A is the same as polyether A in embodiment 1, and the addition amount is 20g; polyether B is the same as polyether B in embodiment 1, and the addition amount is 25g; The polyether C is the same, and the addition amount is 50 g; the polyether D is the same as the polyether D in Example 1, and the addition amount is 5 g.

[0060] Catalyst: PC5 0.25g, PC8 1.8g.

[0061] Silicone oil: B8462 2.2g.

[0062] Water: 2.1 g.

[0063] Pentane blowing agent: 15g of cyclopentane and isopentane, the mass ratio of cyclopentane and isopentane is 70:30.

[0064] Polyisocyanate: PM200 150g.

[0065] The preparation method of above-mentioned rigid polyurethane foam comprises the steps:

[0066] (1) After weighing the above-mentioned combined polyether alcohol, catalyst, silicone oil and water, fully mix to obtain dry white material;

[0067] (2) Add pentane into the dry white material, mix well, and control the temperature o...

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Abstract

The invention discloses a rigid polyurethane foam and a preparation method thereof. The rigid polyurethane foam comprises, by weight, 138-171 parts of isocyanate, 100 parts of a polyether polyol composition, 10-15 parts of a foaming agent and 5-9 parts of an assistant, wherein 100 parts of the polyether polyol composition comprise 5-25 parts of first polyether polyol, and the first polyether polyol is polyether prepared by taking a benzene-containing amine compound as an initiator and reacting the benzene-containing amine compound with propylene oxide or / and ethylene oxide. The method can effectively shorten the demoulding time of the foam product under the condition of ensuring lower expansion rate and heat conductivity coefficient, thereby the productivity is improved, and the rigid polyurethane foam has the advantages of low heat conductivity coefficient, small expansion rate, high productivity and the like.

Description

technical field [0001] The invention relates to the field of foams, in particular to a rigid polyurethane foam that can be effectively applied to refrigerators and freezers and has a short demoulding time and a preparation method thereof. Background technique [0002] In the refrigerator and freezer industry at home and abroad, because the rigid foam system of cyclopentane has low thermal conductivity, good physical properties and excellent aging resistance, it is widely used at home and abroad. However, compared with the traditional blowing agent CFC-11, the thermal conductivity of the cyclopentane blowing agent is still higher, and it is flammable. The transformation of the production equipment increases the cost of the equipment. At the same time, it is necessary to increase the foaming under the same conditions. Density to ensure foam dimensional stability also increases production costs. Therefore, under the condition of ensuring the same physical properties of foam pr...

Claims

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): C08G18/50C08G18/48C08G65/26C08J9/14C08G101/00
CPCC08G18/5021C08G18/482C08G65/2627C08G65/2609C08J9/141C08J2203/14C08J2375/08C08J2203/182
Inventor任浩军宋宝宁关永坚李玉博
Owner上海抚佳精细化工有限公司