Polyurethane sealant and preparation method thereof

A polyurethane sealant and prepolymer technology, applied in the field of sealants, can solve the problems of chemical reaction bubbles, affecting the application effect and working efficiency of the one-component polyurethane sealant, affecting the bonding strength, etc., and achieving a reduction in the probability of bubbles. Effect

Inactive Publication Date: 2015-12-30
三友(天津)高分子技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] But existing polyurethane sealant especially has following defect when automobile glass is installed: 1. when one-component polyurethane sealant is used for automobile glass assembly bonding, its body strength is lower than 8Mpa (GB / T528) or elongation Less than 450% (GB / T528); ② At low temperature (0°C-10°C), the curing rate is lower than 3.0mm / 24 hours; ③Chemical reaction produces air bubbles during the curing process, which affects the bonding strength
The above defects directly affect the application effect and work efficiency of the one-component polyurethane sealant

Method used

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Examples

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Embodiment Construction

[0017] In order to further illustrate the technical means and effects of the present invention to achieve the intended purpose of the invention, the specific implementation of the polyurethane sealant proposed according to the present invention is described in detail below in conjunction with the preferred embodiments.

[0018] (1) Synthesis of prepolymer

[0019] Prepolymer Synthesis Example 1-4, by weight percentage, its specific composition is shown in Table 1:

[0020] Table 1

[0021] Prepolymer Polyether diol(%) Polyether triol(%) Butanediol(%) Diphenylmethane diisocyanate (%) Dibutyltin dilaurate (%) Oxazolidine latent curing agent (%) Acid catalyst (%) Defoamer (%) Example 1 30 52 1.9 14 0.1 1.8 0.1 0.1 Example 2 35 45 2.3 15 0.2 2 0.3 0.2 Example 3 40 40 2.4 15.5 0.3 1.3 0.2 0.3 Example 4 45 34 2.5 16.2 0.5 1.1 0.3 0.4

[0022] The preparation method of above prepolymer embodiment has th...

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Abstract

The invention discloses a polyurethane sealant and a preparation method thereof. The sealant is prepared from a prepolymer, a plasticizer, pigment and filler, a thickening agent, and a silane coupling agent, wherein the prepolymer is composed of polyether diol, polyether triol, butanediol, diphenylmethane diisocyanate, dibutyltin dilaurate, an oxazolidine latent curing agent, an acid catalyst and a defoaming agent. After the sealant is cured, the tensile strength of an elastomer is more than or equal to 8MPa, and the elongation at break is more than or equal to 450%. The sealant not only has good curing rate at normal temperature, but also has high curing rate in low temperature and low humidity conditions. The polyurethane sealant is suitable for elastic bonding of high mechanical property, for example, elastic bonding for glass installation of automobiles, trains, ships, planes, cable cars and the like. The polyurethane sealant is suitable for rapid bonding in low temperature and low humidity environments and other elastic bonding of high mechanical property.

Description

technical field [0001] The invention relates to a sealant, in particular to a polyurethane sealant and a preparation method thereof. It is a high modulus polyurethane sealant used for elastic bonding of glass, metal, ceramics, stone, etc. Background technique [0002] Sealant is a material used to fill gaps (holes, joints, seams, etc.) and has a bonding effect on the interface of the filled base. It mainly includes: silicone (including modified silicone), polyurethane, polysulfide rubber , polyacrylates, asphalt, oil ester caulking, etc. Elastic sealant is a product that combines two functions of bonding and sealing. Among them, the three types of high-grade elastic sealants with better performance are silicone sealant, polysulfide sealant and polyurethane sealant, and they must be used to fill gaps that are subject to vibration or thermal expansion and contraction. Use elastic sealant. In recent years, elastic sealants have been used more and more widely in many industr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J175/08C09J11/04C09J11/06C08G18/76C08G18/66C08G18/48C08G18/32C08G18/12C09K3/10
Inventor 程波李程张金平段亚冲闫静邵凯王晓彤
Owner 三友(天津)高分子技术有限公司
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