Low-density hard polyurethane foam and preparation method thereof

A rigid polyurethane and low-density technology, which is applied in the field of low-density rigid polyurethane foam and its preparation, can solve the problems of foaming agent escape, foaming agent solubility limit, and foam density increase, so as to reduce the stable density and ensure Mechanical strength, the effect of promoting production efficiency

Active Publication Date: 2019-07-26
HONGBAOLI GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The defect that this technological method exists is: the dissolubility of the blowing agent of low boiling point in polyol is limited, and actual technological operation is difficult, and blowing agent is easy to escape from reaction liquid, causes foam density to increase and surface pore increases, Poor foam performance

Method used

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  • Low-density hard polyurethane foam and preparation method thereof
  • Low-density hard polyurethane foam and preparation method thereof
  • Low-density hard polyurethane foam and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0064] Component A: The feed liquid temperature is 35°C,

[0065] Complex polyol: hydroxyl value 430mgKOH / g, 100 parts, including:

[0066] Polyether polyol A: sucrose polyether polyol with a hydroxyl value of 450-530 mgKOH / g, 40 parts;

[0067] Polyether polyol B: glycerol polyether polyol, hydroxyl value 200-300mgKOH / g, 30 parts;

[0068] Polyether polyol C: Sorbitan polyether polyol, the hydroxyl value is 400-480 mgKOH / g, 30 parts;

[0069] Amine catalyst: 0.5 parts of pentamethyldiethylenetriamine; 1.2 parts of dimethylcyclohexylamine; 0.5 parts of 1,3,5-tris(dimethylaminopropyl)-hexahydrotriazine;

[0070] Silicon surfactant: Niax L-6891, 2.5 parts;

[0071] Water: 1.2 parts;

[0072] Cyclopentane: 12 parts;

[0073] Component B: The feed liquid temperature is 15°C,

[0074] Isobutane: 5 parts;

[0075] Polyphthalic anhydride ethylene glycol ester polyol modified isocyanate: NCO% is 23%, 173 parts;

[0076] The mold temperature is 40°C, and the demoulding time is ...

Embodiment 2

[0078] Component A: The feed liquid temperature is 30°C,

[0079] Complex polyol: hydroxyl value 480mgKOH / g, 100 parts, including:

[0080] Polyether polyol A: vegetable oil-based polyol with a hydroxyl value of 460-580 mgKOH / g, 40 parts;

[0081] Polyether polyol B: polycarbonate polyol with a hydroxyl value of 360-440 mgKOH / g, 10 parts;

[0082] Polyether polyol C: phenylenediamine polyether polyol with a hydroxyl value of 480-530 mgKOH / g, 20 parts;

[0083] Polyether polyol D: sorbitol and glycerin composite polyether polyol, the hydroxyl value is 330-420 mgKOH / g, 30 parts;

[0084] Amine catalyst: 0.3 part of bis(dimethylaminoethyl) ether, 0.7 part of triethylenediamine, 0.5 part of 2-hydroxypropyltrimethylammonium formate;

[0085] Silicone surfactant: 1.0 part of Niax L-6988, 0.5 part of Niax L-6863;

[0086] Water: 1.8 parts;

[0087] Cyclopentane: 15 parts;

[0088] Component B: feed liquid temperature is 10°C

[0089] Butane: 3 parts;

[0090] Glycerol polyeth...

Embodiment 3

[0093] Component A: The feed liquid temperature is 41°C,

[0094] Polyol composition: hydroxyl value 550mgKOH / g, 100 parts, including:

[0095] Polyether polyol A: sucrose polyether polyol with a hydroxyl value of 500-620 mgKOH / g, 50 parts;

[0096] Polyether polyol B: vegetable oil-based polyol with a hydroxyl value of 530-600 mgKOH / g, 20 parts;

[0097] Polyether polyol C: xylitol, glycerin composite polyether polyol, hydroxyl value 420-560 mgKOH / g, 30 parts;

[0098] Amine catalyst: 0.1 part of bis(dimethylaminoethyl) ether, 1.4 part of dimethylbenzylamine, 0.4 part of dimethylethanolamine, 0.9 part of 2,4,6-tris(dimethylaminomethyl)phenol;

[0099]Silicon surfactant: AK8830, 1.0 parts;

[0100] Water: 2.5 parts;

[0101] Cyclopentane: 5 parts;

[0102] Component B: The feed liquid temperature is 20°C,

[0103] n-butane: 5 parts, isobutane: 5 parts;

[0104] Diethylene phthalate polyol modified isocyanate: NCO% is 25%, 220 parts.

[0105] The mold temperature is 45°...

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Abstract

The invention discloses low-density hard polyurethane foam which is prepared by respectively premixing components A and components B, jointly mixing and foaming. The components A include, by weight, 100 parts of composite polyol, 5-15 parts of cyclopentane, 1.5-6 parts of amine catalyst, 1-5 parts of silicon surfactant and 0.8-2.5 parts of water, and the components B include, by weight, 1-10 partsof butane and 120-220 parts of isocyanate, wherein each raw material above is based on 100 parts of composite polyol. The preparation method includes following steps: (1), preparing the components A;(2), preparing the components B; (3), injecting the components A and the components B into a closed mold, allowing sufficient reaction, and demolding to obtain the hard polyurethane foam. The low-density hard polyurethane foam is environment-friendly and excellent in performance.

Description

technical field [0001] The present invention relates to a kind of low density rigid polyurethane foam and its preparation method, more specifically, relate to a kind of low density rigid polyurethane foam and its preparation method using cyclopentane and butane as blowing agent Background technique [0002] Rigid polyurethane foam (hereinafter referred to as rigid foam) is made by addition polymerization of polyisocyanate and polyol in the presence of catalysts and other additives. It has excellent heat insulation performance, sound insulation, insulation, light weight, and It has the characteristics of high strength and good processing performance, and is widely used as thermal insulation and cold insulation materials. In order to achieve a better thermal insulation effect, a certain amount of physical foaming agent with low boiling point and low thermal conductivity needs to be added to the foam material. Unfortunately, the traditional polyurethane blowing agent monofluor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/66C08G18/32C08G18/40C08G18/44C08G18/48C08G18/50C08G18/78C08J9/14C08G101/00
CPCC08G18/3206C08G18/4018C08G18/44C08G18/4804C08G18/482C08G18/4829C08G18/4883C08G18/5021C08G18/6611C08G18/7843C08J9/141C08J2203/14C08J2203/182C08J2375/04C08J2375/08C08G2110/0025
Inventor 邢益辉吴一鸣熊丽媛
Owner HONGBAOLI GRP CO LTD
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