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Preparation method of bottom coating penetrant specially used for concrete joint sealant

A penetrant and concrete technology, which is applied in the field of preparation of penetrant for concrete joint sealant primer, can solve the problems of high adhesion and non-polluting, and achieve the effect of excellent adhesion

Active Publication Date: 2016-03-09
BEIJING ACAD OF BUILDING ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Based on the problems existing in the above-mentioned technologies, the embodiment of the present invention provides a preparation method suitable for the special primer penetrating agent of concrete substrate sealant, so as to solve the problem of good compatibility between sealant and concrete, high cohesiveness and non-pollution And other issues

Method used

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  • Preparation method of bottom coating penetrant specially used for concrete joint sealant

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Experimental program
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Embodiment 1

[0014] Put 21 parts of polyether diol with a molecular weight of 1000 and 13.2 parts of butyl acetate into the reactor, add 25.8 parts of diphenylmethane-4,4'-diisocyanate and mix thoroughly, and react at a temperature of 80°C 4 hours, the test NCO content is 11.5%, promptly makes the low-viscosity polyurethane prepolymer;

[0015] Add 6.6 parts of γ-glycidyl etheroxypropyltrimethoxysilane and 18.9 parts of xylene into the reactor, slowly add 4.5 parts of ethanolamine dropwise at a temperature of 75°C, and then keep the temperature for 2.5 hours to obtain Functional silane chain extender;

[0016] Put 50 parts of the low-viscosity polyurethane prepolymer prepared above into the reactor, add 0.5 parts of the catalyst, slowly add 20 parts of the functional silane chain extender at a temperature of 85°C, and finish the dropwise addition within 1 hour, and keep warm for the reaction After 2 hours, 28 parts of solvent and 1.5 parts of silicone active penetrating agent were added, ...

Embodiment 2

[0018] Put 18 parts of polyether triols with a molecular weight of 500 and 12 parts of butyl acetate into the reactor, add 30 parts of diphenylmethane-4,4'-diisocyanate and mix thoroughly, and react at a temperature of 82°C After 3.5 hours, the NCO content was tested to be 9.8%, that is, a low-viscosity polyurethane prepolymer was obtained;

[0019] Add 6 parts of γ-glycidyl etheroxypropyltrimethoxysilane and 20.4 parts of butyl acetate into the reactor, slowly add 3.6 parts of diethanolamine dropwise at a temperature of 80°C, and then keep the temperature for 3 hours, that is Prepare functional silane chain extender;

[0020] Put 52 parts of the low-viscosity polyurethane prepolymer prepared above into the reactor, add 0.4 parts of catalyst, and slowly add 21 parts of functional silane chain extender at a temperature of 85°C, dropwise complete within 1 hour, and keep warm for the reaction After 2 hours, 25 parts of solvent and 1.6 parts of silicone active penetrant were adde...

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Abstract

The present invention provides a bottom coating penetrant specially used for a concrete joint sealant, the bottom coating penetrant comprises the following components by weight: 50 to 65 parts of a low viscosity polyurethane prepolymer, 20 to 35 parts of a functional silane chain extender, 0.1 to 5 parts of a catalyst, 0.1 to 5 parts of an organic silicon active penetrant and 25 to 50 parts of a solvent, by introduction of the functional silane chain extender, the bottom coating penetrant specially used for the concrete joint sealant can be well compatible with polyurethane sealants and silicone sealants; the organic silicon active penetrant improves the permeability of the penetrant in concrete pores, adhesion of the penetrant to concrete can be improved, the sealant and concrete edge cracking problem can be effectively solved, and the use life of the sealant can be improved.

Description

technical field [0001] The invention relates to a primer for sealant, in particular to a preparation method for a primer penetrant for concrete joint sealant. Background technique [0002] As an important component of building joints, building sealant is a kind of product for building sealing and waterproofing. With the continuous improvement of modern construction technology and the vigorous development of housing industrialization in mainland China, the necessity of technology maturity, matching and professionalism is highlighted. The biggest feature of housing industrialization is factory prefabrication and on-site assembly operations. Regardless of the mode adopted by Japanese PC buildings, which is the method of hanging PC panels on steel structures, it is necessary to carry out sealing material treatment on the panel seams after assembly. The service life of building sealants is largely reflected in its adhesion to the substrate. Therefore, sealing materials play a ...

Claims

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Application Information

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IPC IPC(8): C08G18/66C08G18/10C08G18/32
CPCC08G18/10C08G18/6666C08G2190/00C08G18/3893
Inventor 赖振峰王万金贺奎董全霄朱宁樊勇吴敬朋贾方方
Owner BEIJING ACAD OF BUILDING ENG