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Low-modulus polyurethane sealant with high elasticity recovery rate and preparation method thereof

A polyurethane sealant, high-elasticity technology, used in polyurea/polyurethane adhesives, adhesives, non-polymer adhesive additives, etc., can solve the problems of poor sealing performance and low elastic recovery performance at concrete joints, Achieve the effect of avoiding phase separation, reducing damping, and improving interaction

Active Publication Date: 2018-05-11
JIANGSU SOBUTE NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] In order to solve the problem of low elastic recovery performance of low modulus sealants in the prior art and poor sealing performance at concrete joints, the invention provides a low modulus silicone modified polyurethane sealant and its preparation method , the low-modulus silicone-modified polyurethane sealant has good elastic recovery performance, and at the same time has certain hydrophobic properties, excellent water resistance, and good stability

Method used

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  • Low-modulus polyurethane sealant with high elasticity recovery rate and preparation method thereof
  • Low-modulus polyurethane sealant with high elasticity recovery rate and preparation method thereof
  • Low-modulus polyurethane sealant with high elasticity recovery rate and preparation method thereof

Examples

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Effect test

Synthetic example

[0058] Preparation of hydroxyl-terminated polydimethylsiloxane: Mix 350 parts of dimethyldimethoxysilane and 104 parts of deionized water, add hydrochloric acid solution dropwise to pH 3.2, and stir at room temperature for 10 minutes. 2 parts by mass percent concentration of 35% NaH 2 PO 4 / Na 2 HPO 4 The aqueous solution was slowly dropped into the mixed solution, and stirred at room temperature for 10 min. Distill under reduced pressure, filter, and dry to obtain hydroxyl-terminated polydimethylsiloxane PDMS-1.

[0059] Preparation of hydroxyl-terminated polydimethylsiloxane: Mix 390 parts of dimethyldimethoxysilane and 120 parts of deionized water, add hydrochloric acid solution dropwise to pH 3.9, and stir at room temperature for 20 minutes. 1 part of NaH with a mass percent concentration of 35% 2 PO 4 / Na 2 HPO 4 The aqueous solution was slowly dropped into the mixed solution, and stirred at room temperature for 50 min. Distill under reduced pressure, filter, and...

Embodiment 1

[0066] Preparation of silicone-modified polyurethane sealant with low modulus and high elastic recovery:

[0067] Take 100 parts of SPU-1, add it to a 5L planetary mixer, add 80 parts of dioctyl phthalate, 100 parts of silane-modified nano calcium carbonate NanoCaCO 3 -1, under the conditions of planetary revolution speed 70rpm and dispersion speed 15m / s, high-speed stirring for 1.2h, then add 1 part of vinylsilane, 0.5 part of 3,5-di-tert-butyl-4-hydroxyphenylpropionate isooctyl, 1 part of 3-aminopropylmethylsiloxane, 0.5 part of bis(1,2,2,6,6-pentamethyl-4-piperidinyl) sebacate), 1 part of 2-(2' -Hydroxy-3',5'-di-tert-butylphenyl)benzotriazole, 0.5 parts of dibutyltin dilaurate, continue to vacuumize and stir (vacuum degree<200mbar, planetary revolution line speed 45rpm, dispersion line speed 15m / s) 1.5h, discharge.

Embodiment 2

[0069] Preparation of silicone-modified polyurethane sealant with low modulus and high elastic recovery:

[0070] Take 100 parts of SPU-2, add it to a 5L planetary mixer, add 100 parts of dinonyl phthalate, 150 parts of silane-modified nano calcium carbonate NanoCaCO 3 -2. Stir at high speed for 1.5h under the conditions of planetary revolution speed 80rpm and dispersion speed 12m / s, then add 2 parts of vinylsilane and 1.0 part of 3,5-di-tert-butyl-4-hydroxyphenylpropionate isooctyl, 2 parts of 3-n-butylaminopropyltrimethoxysilane, 1 part of bis(1,2,2,6,6-pentamethyl-4-piperidinyl) sebacate, 2 parts of 2-(2 '-Hydroxy-3', 5'-di-tert-butylphenyl)benzotriazole, 1 part of stannous octoate, continue vacuum stirring (vacuum degree <200mbar, planetary revolution line speed 50rpm, dispersion line speed 12m / s ) 2h, discharge.

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Abstract

The invention discloses a low-modulus polyurethane sealant with a high elasticity recovery rate and a preparation method thereof. The low-modulus polyurethane sealant with the high elasticity recoveryrate is prepared from an organosilicone-modified polyurethane prepolymer and silane-modified nano calcium carbonate. The low-modulus organosilicone-modified polyurethane sealant has favorable elasticity recovery performance, and meanwhile, has certain hydrophobic performance, excellent water resistance and good stability.

Description

technical field [0001] The invention relates to a polyurethane sealant with low modulus and high elastic recovery rate and a preparation method thereof, belonging to the technical field of silane-modified polyurethane sealant. Background technique [0002] Silane modified polyurethane elastic sealant is a new type of elastic sealant after polysulfide type, silicone type and polyurethane type. It has good mechanical properties and storage stability, excellent adhesion, coatability and weather resistance It has a broad application prospect in the field of construction. [0003] When the elastic sealant is used for caulking and sealing of high deformation joints of concrete, the modulus of the sealant is too high, and it is easy to be bonded and damaged at the deformation interface of the concrete joints, so it is suitable to use low modulus, high adhesion and high elasticity sealant. [0004] The elastic recovery performance of the sealant is an important property that deter...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09J175/08C09J11/04C08G18/40C08G18/61C08G18/48
CPCC08G18/4009C08G18/4812C08G18/61C08K9/06C08K2003/265C08K2201/011C09J11/04C09J175/08
Inventor 冉千平孙德文刘娜刘玉亭李波尹浩万赟
Owner JIANGSU SOBUTE NEW MATERIALS
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