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Hardly-foamed one-component polyurethane sealant

A technology of polyurethane sealant and polyurethane prepolymer, applied in the field of sealant, can solve problems such as easy foaming, and achieve the effects of good elasticity, excellent bonding performance and high strength

Active Publication Date: 2014-07-02
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

One-component moisture-curing polyurethane is prone to foaming when it is cured in a high-humidity and high-heat environment, which needs to be solved and further improved

Method used

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  • Hardly-foamed one-component polyurethane sealant
  • Hardly-foamed one-component polyurethane sealant

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Embodiment Construction

[0027] In the following text, the invention will now be described more fully, illustrating various embodiments. However, this invention may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

[0028] The polyether polyol mixture (PPG polyether with a molecular weight of 2000, a functionality of 2, and an E0-terminated propylene oxide polyether with a molecular weight of 6000, a functionality of 3, and a mass ratio of 1:2) and a plasticizer Put it into the reaction kettle, under the conditions of 110~130℃ and vacuum degree of -0.098 MPa, dehydrate until the water content is less than 500ppm, then cool down to about 50℃, add polyisocyanate MDI, nitrogen protection, stirring, control the reaction temperature 75~ React at 90°C for 1.5 hours to obtain ...

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Abstract

The invention relates to a hardly-foamed one-component polyurethane sealant, belonging to the technical field of sealants. The sealant is prepared from the following raw materials in parts by weight: 30-60 parts of a polyurethane pre-polymer, 0-50 parts of a filling material, 0-30 parts of a plasticizer, 0.2-0.9 part of a catalyst and 0.3-1 part of a bonding force enhancer. The sealant has stable storage and good workability, is not easy to foam even under a high-humidity and high-temperature environment, has good mechanical properties and strong bonding force after curing, and is particularly suitable for the elastic bonding of glass and metal base materials.

Description

technical field [0001] The invention belongs to the technical field of sealants, and in particular relates to a preparation method of a polyurethane sealant which is not easy to foam when cured in a high-humidity and high-heat environment. Background technique [0002] Sealant is a material that is caulked on site and bonded together after curing to seal dust, water, and withstand certain deformations. It is generally composed of polymer resin, fillers, plasticizers, additives, etc. According to different polymer resins, it can be divided into polysulfide sealant, butyl sealant, silicone sealant, polyurethane sealant, etc. Among them, polyurethane sealant refers to a type of sealant that contains carbamate (-NH-CO-O-) in the molecular chain and isocyanate (-NCO) in the end group. Polyurethane sealant has the characteristics of high strength, good elasticity, outstanding wear resistance, puncture resistance, good water resistance, and good low temperature resistance. Polyu...

Claims

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Application Information

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IPC IPC(8): C09J175/08C09J11/04C09J11/06C08G18/48C08G18/12
Inventor 魏柳荷吴林志武金笔任彩梅顾刘峰
Owner ZHENGZHOU UNIV
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