Single-component polyurethane sealant and preparation method thereof

A polyurethane sealant, one-component technology, used in the field of sealants, can solve the problems of poor alkali resistance, long-term heat resistance, poor water resistance of polyurethane sealants, etc., to achieve optimal product stability and reduce moisture content Effect

Inactive Publication Date: 2013-10-30
SHANGHAI REDBEST NEW MATERIAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Such as: not long-term heat resistance; light-colored formulas are susceptible to UV aging; the storage stability of one-component adhesives is greatly affected by packaging and the outside world, and usually cur...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0014] The present invention is described below in conjunction with specific embodiment:

[0015] Now take the production of 1000 kg of one-component polyurethane sealant as an example: production process requirements

[0016] 1. Make molding agent

[0017] According to the proportion, 150 kg of isocyanate and 50 kg of diamine were added to 40 kg of coupling agent, and then stirred evenly to make 190 kg of isocyanate solution and 90 kg of diamine solution, and then the above two solutions were mixed according to The ratio of 19:9 is fully mixed with a mixing pump to make 280 kg of molding agent;

[0018] 2. Making Highly Elastic Polymers

[0019] Use a heatable and coolable vacuum stirred tank as the reactor, add 30 kg of xylene, 30 kg of isocyanate and 350 kg of polyether polyol in order under stirring, and heat the reaction to dissolve the isocyanate in the isocyanate Add 0.5 kg of water-removing agent after the acid is fully reacted to obtain 410.5 kg of high elastic pol...

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Abstract

The invention discloses a single-component polyurethane sealant which is composed of the following components by weight percentage: 41.05% of high-elasticity polymer, 23.45% of calcium carbonate, 5% of titanium dioxide, 28% of forming agent, 2% of dimethylbenzene and 0.5% of moisture scavenger, wherein the high-elasticity polymer is composed of the following components by weight percentage: 7.31% of dimethylbenzene, 7.31% of isocyanate, 85.26% of polyether polyol and 0.12% of moisture scavenger, and the forming agent is composed of the following components by weight percentage: 53.57% of isocyanate, 17.85% of diamine and 28.58% of coupling agent. A preparation method of the single-component polyurethane sealant comprises the following steps of: with a vacuum stirring tank capable of being cooled as a stirrer, adding 41.05% of high-elasticity polymer at first, and then adding 23.45% of calcium carbonate, 5% of titanium dioxide, 28% of forming agent and 2% of dimethylbenzene, stirring until 60 DEG C, and then adding 0.5% of moisture scavenger, and stirring evenly, thereby obtaining the single-component polyurethane sealant, and finally packaging the single-component polyurethane sealant. The single-component polyurethane sealant has the advantage that the self-made forming agent and the polymerization elastomer as well as special moisture removal material are employed so that the caking property, sagging resistance, elasticity and stability of the single-component polyurethane sealant can meet a higher standard.

Description

technical field [0001] The invention relates to a sealant, in particular to a one-component polyurethane sealant, which is applied to the sealing fields of wood, metal, metal primer and topcoat, ceramic materials and plastics. Background technique [0002] Polyurethane sealant has the following characteristics: excellent wear resistance; low temperature softness; wide range of performance adjustment; high mechanical strength; good adhesion; good elasticity, excellent recovery, suitable for dynamic joints; weather resistance Good, the service life can reach 15-20 years; excellent oil resistance; biological aging resistance; moderate price. Polyurethane sealants also have some disadvantages. Such as: not long-term heat resistance; light-colored formulas are susceptible to UV aging; the storage stability of one-component adhesives is greatly affected by packaging and the outside world, and usually cures slowly; bubbles and cracks may occur in high-temperature thermal environme...

Claims

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Application Information

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IPC IPC(8): C09J175/08C09J11/00C08G18/48C09K3/10
Inventor 张恩源
Owner SHANGHAI REDBEST NEW MATERIAL TECH
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