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Polythioether sealant

A sealant and polysulfide technology, applied in adhesives, adhesive additives, non-polymer adhesive additives, etc., can solve problems such as side group difficulties, and achieve increased crosslinking density, high yield, and rapid response Effect

Active Publication Date: 2016-02-03
BAIMTEC MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is: to propose an improved polythioether sealant, in order to solve the difficult problem of introducing side groups when the current light-curing polysulfide sealant is cured

Method used

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  • Polythioether sealant

Examples

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Effect test

preparation example Construction

[0023] The preparation method of the above polysulfide sealant is as follows: Weigh the components of the polysulfide sealant in proportion, put them into a vacuum stirring device and stir for 10 minutes, then carry out vacuum stirring and mixing for at least 2 hours, and the vacuum pressure is not If it is greater than 20mbar, the sealant can be prepared and stored in a low-temperature shading seal.

[0024] The method of use is: apply the polysulfide sealant on the surface of the object to be sealed. These sealed objects can be metal plates, ceramic plates or organic plates, or braids of metal fibers or organic fibers. The curing method of the polysulfide sealant of the present invention is as follows: after coating, it can be irradiated with a light source for a certain period of time, and the light source can be natural light, a low-pressure mercury lamp, a medium-pressure mercury lamp or an LED ultraviolet lamp. Low-pressure mercury lamps are widely used, and the curing t...

Embodiment 1

[0025] Example 1: A polysulfide sealant containing pendant alkyl groups.

[0026] Mercapto-terminated liquid polysulfide rubber (30 g), n-heptyne (0.577 g, 0.006 mol), (2,4,6-trimethylbenzoyl) diphenylphosphine oxide (TPO) (0.6 g) , γ-mercaptopropyltrimethoxysilane (0.3g), and fumed silica (6g) were put into a 500mL three-neck round-bottomed flask, and stirred for 10min. Then reduce the pressure in the flask to 20mbar, and continue to stir for 2h. Afterwards, transfer the sealant product to an 80×50×2 steel abrasive tool, using a 365nm wavelength UV lamp 2200μW / cm 2 Cured for 2 minutes under the light intensity to obtain a rubber sheet. Prepare test pieces according to HB5246-1993, test performance in GB / T528-2009, use type 2 samples for tensile samples, measure the tensile strength, elongation at break and Shore hardness of the sealant after curing, see Table 1. Coat the mixed polysulfide sealant on the chromic acid anodized aluminum plate to form a thin layer of about 2mm...

Embodiment 2

[0027] Example 2: Polysulfide sealant containing side hydroxyl groups.

[0028] Mercapto-terminated liquid polysulfide rubber (30g), 6-heptynol (0.572g, 0.006mol), TPO (0.6g), γ-mercaptopropyltrimethoxysilane (0.3g), fumed silica (6g) was put into a 500mL round-bottomed three-neck flask, and stirred for 10min. Then reduce the pressure in the flask to 20mbar, and continue to stir for 2h. Afterwards, transfer the sealant product to an 80×50×2 steel abrasive tool, using a 365nm wavelength UV lamp 2200μW / cm 2Cured for 2 minutes under the light intensity to obtain a rubber sheet. Prepare test pieces according to HB5246-1993, test performance in GB / T528-2009, use type 2 samples for tensile samples, measure the tensile strength, elongation at break and Shore hardness of the sealant after curing, see Table 1. Coat the mixed polysulfide sealant on the chromic acid anodized aluminum plate to form a thin layer of about 2mm, and then cover it with a steel mesh. Cure for two minutes us...

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Abstract

The invention belongs to a sealant preparation technology and relates to a modified polythioether sealant. The polythioether sealant is characterized by being prepared from, by weight, 100 parts of liquid sulfydryl end-capped polythioether rubber, 1-8 parts of an alkynyl compound, 0.001-1 part of a photo-initiator, 0.1-10 parts of a coupling agent and 10-50 parts of a packing. By the adoption of the polythioether sealant, the problem that a side group is difficult to introduce when an existing photo-curing polythioether sealant is cured is solved.

Description

technical field [0001] The invention belongs to the sealant manufacturing technology and relates to an improved polysulfide sealant. Background technique [0002] Polythioethers were mentioned by Ballard et al. in U.S.2484369 as early as 1949, but the first patent of liquid polythioethers that can be used commercially in sealants was first published in U.S.4066307 by HakamSingh et al. of Products Research & Chemical Corp (PRC) , and its synthesis method has undergone a lot of improvements, including U.S.5801290, U.S.5959071 and so on. [0003] Polysulfide sealants are widely used in aviation, construction and other fields due to their excellent oil resistance and heat resistance. The curing methods of polysulfide sealants can be divided into thermal curing, moisture curing and light curing. There are many patents related to the curing method of polysulfide sealant. For example, Chinese patent (CN102585501A) discloses a preparation technology and application method of a dit...

Claims

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Application Information

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IPC IPC(8): C08L81/02C08K13/02C08K5/01C08K5/05C08K5/548C08K3/36C08J3/24C08J3/28C09J181/02C09J11/06C09K3/10
Inventor 郭瑞毅章谏正吴松华秦蓬波
Owner BAIMTEC MATERIAL CO LTD
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