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Silane modified polyether, preparation method and application thereof

A silane-modified polyether and polyether technology, applied in the field of sealants, can solve the problems of improving the difficulty of mixing process, prone to glue back, copper corrosion, etc.

Pending Publication Date: 2022-01-21
HUNAN SOKAN NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Silane-modified polyurethane sealant is affected by its blocked monomer isocyanate-trimethoxysilane, and the cost is high; at the same time, a high content of amine impurities may remain in the production process of isocyanate-trimethoxysilane, which will lead to silane modification. Polyurethane sealants have obvious self-catalysis, which increases the difficulty of the subsequent mixing process and reduces its storage stability
[0006] Silane-modified polyether sealants are generally end-capped with methoxysilane or methyl ethyl ketoxime silane. The hydrolysis product of the former is methanol, which will not corrode the bonding substrate, but it is prone to glue back in high-temperature and high-humidity environments. Phenomenon, in addition, compared with methyl ethyl ketoxime silane-terminated polyether sealants, the hydrolytic activity of methoxysilane-terminated polyether sealants is lower, so the curing speed is slow; , but its hydrolysis product is butanone oxime (methyl ethyl ketone oxime) which is severely corrosive to metal substrates, especially copper, and can corrode some plastics, so the application occasions are severely limited
[0007] In summary, although silane-modified polyether sealants have obvious advantages over other types of sealants, there is still a problem of difficult balance between curing speed and corrosion performance.

Method used

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  • Silane modified polyether, preparation method and application thereof
  • Silane modified polyether, preparation method and application thereof
  • Silane modified polyether, preparation method and application thereof

Examples

Experimental program
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Embodiment 1

[0156] This embodiment has prepared a kind of silane modified polyether, and concrete process is:

[0157] S1. 1mol polyethylene glycol monoallyl ether (CAS: 27274-31-3, average molar mass 4000g / mol, purchased from Wuhan Huaxiang Kejie Biotechnology Co., Ltd.), 3mol polypropylene glycol (average molar mass 3000g / mol) and 2mol dichloromethane under the catalysis of caustic alkali (sodium hydroxide, 5mg / kg) chain extension polymerization (room temperature, 3h), then add 2mol allyl chloride after capping for 3h, vacuum evaporate at 80 ℃ Go out residual dichloromethane and allyl chloride, obtain the first intermediate;

[0158] S2. Perform a catalytic reaction of 1 mol of the first intermediate and 2.1 mol of dimethylsilane (the catalyst is chloroplatinic acid, CAS: 16941-12-1, the addition amount is 10 ppm), the temperature of the catalytic reaction is 80°C, and the time is 2h. Get the second intermediate;

[0159] S3. Catalytic addition reaction of 1 mol of the second interme...

Embodiment 2

[0161] This embodiment prepares a kind of silane modified polyether, the difference of specific process and embodiment 1 is:

[0162] (1) In step S1, polypropylene glycol (3000g / mol) is replaced with polyethylene glycol propylene glycol copolymer (4500g / mol);

[0163] (2) In step S3, vinylmethyldiacetoxysilane was replaced with vinyltriacetoxysilane (CAS: 4130-08-9).

Embodiment 3

[0165] This embodiment prepares a kind of silane modified polyether, the difference of specific process and embodiment 1 is:

[0166] (1) In step S1, replace polyethylene glycol monoallyl ether with allyl polyoxyethylene polyoxypropylene ether (CAS: 9041-33-2, average molar mass 4000g / mol, purchased from Wuhan Huaxiang Kejie Biotechnology Co., Ltd.);

[0167] (2) In step S1, polypropylene glycol (3000g / mol) is replaced by polypropylene glycol (4500g / mol);

[0168] (3) In step S3, vinylmethyldiacetoxysilane is replaced with vinyltriacetoxysilane.

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Abstract

The invention discloses silane modified polyether, a preparation method and application thereof. The silane modified polyether provided by the invention is acetoxysilane-terminated polyether, so that the curing speed of a sealant containing the silane modified polyether can be increased, and meanwhile, the corrosion resistance of the sealant is reduced. The invention also provides a preparation method of the silane modified polyether, a sealant comprising the silane modified polyether, and a preparation method and application of the sealant. The silane modified polyether and the layered double-metal hydroxide in the sealant have a synergistic effect, so that the curing speed of the sealant can be further improved, and the corrosion to a base material is reduced.

Description

technical field [0001] The invention belongs to the technical field of sealants, and in particular relates to a silane-modified polyether and its preparation method and application. Background technique [0002] Traditional sealants mainly include polysulfide, silicone, polyurethane, epoxy, etc. Among them, silicone sealant and polyurethane sealant have excellent comprehensive performance. Polysulfide sealant has disadvantages such as pungent smell (odor), slow curing at low temperature, easy aging and hardening, and poor durability; the advantage of silicone sealant is its excellent weather resistance. In addition, silicone sealant has complete technology and low Therefore, it also has a certain cost advantage; however, its strength is low and its anti-pollution property is poor. As environmental protection requirements gradually become stricter, its cost will become higher and higher, and the corresponding cost advantage will gradually be lost; polyurethane sealant The ad...

Claims

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Application Information

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IPC IPC(8): C08G81/00C09J187/00C09J11/04
CPCC08G81/00C09J187/005C09J11/04C08K3/26
Inventor 石俊杰孙润鹤龙俊勋王成
Owner HUNAN SOKAN NEW MATERIAL
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