CN-121991335-A - Plasticizer and preparation method thereof, composition for polyether waterproof coating and preparation method thereof

Abstract

The invention relates to the field of building waterproofing, and discloses a plasticizer and a preparation method thereof, a composition for polyether waterproof coating, a polyether waterproof coating and a preparation method thereof. The method for preparing the modified polyether plasticizer comprises the steps of (1) stirring and mixing alpha, omega-dihydroxyl polydimethylsiloxane and alkylene oxide in the presence of a base catalyst to obtain an intermediate I, (2) contacting and mixing a neutralizing agent with the intermediate I to obtain the modified polyether plasticizer, wherein the dosage of the base catalyst is 0.1-1 weight part, the dosage of the alkylene oxide is 400-900 weight parts, and the dosage of the neutralizing agent is 0.12-1.2 weight parts relative to 100 weight parts of the alpha, omega-dihydroxyl polydimethylsiloxane. The silane modified polyether waterproof paint prepared by the modified polyether plasticizer provided by the invention has obviously better weather resistance.

Inventors

• HE HONGLIN
• WANG GANG
• WANG XIANJUN
• ZHENG LIANTAO

Assignees

• 科顺防水科技股份有限公司

Dates

Publication Date

20260508

Application Date

20251222

Claims (10)

1. 1. A process for preparing modified polyether plasticizer features that under the protection of atmosphere, (1) In the presence of a base catalyst, stirring and mixing alpha, omega-dihydroxyl polydimethylsiloxane and alkylene oxide to obtain an intermediate I; (2) The neutralizing agent is contacted and mixed with the intermediate I to obtain the modified polyether plasticizer; The amount of the base catalyst is 0.1 to 1 part by weight, the amount of the alkylene oxide is 400 to 900 parts by weight, and the amount of the neutralizing agent is 0.12 to 1.2 parts by weight, relative to 100 parts by weight of the α, ω -dihydroxy polydimethylsiloxane.
2. 2. The method of claim 1, wherein the α, ω -dihydroxy polydimethylsiloxane has a viscosity of 350-750cs at 25 ℃; and/or the alkylene oxide is selected from at least one of propylene oxide, ethylene oxide, butylene oxide, epichlorohydrin and cyclohexane oxide.
3. 3. The method according to claim 1 or 2, wherein in the step (1), the condition of stirring and mixing includes a temperature of 100-110 ℃ for 2-4 hours; And/or, in the step (2), the contact mixing condition comprises a temperature of 60-70 ℃ and a time of 1-2h.
4. 4. A modified polyether plasticizer prepared by the process of any one of claims 1-3.
5. 5. The composition for the silane modified polyether waterproof coating is characterized by comprising a main agent and an auxiliary agent, wherein the main agent contains alkoxy end capped polyether, acryloyloxy silane and plasticizer; The content of the acryloxysilane is 2 to 3 parts by weight and the content of the plasticizer is 45 to 85 parts by weight relative to 100 parts by weight of the alkoxy-terminated polyether; The plasticizer is the modified polyether plasticizer according to claim 4.
6. 6. The composition of claim 5, wherein the alkoxy-terminated polyether is selected from the group consisting of dialkoxy-terminated polyethers and/or trialkoxy-terminated polyethers.
7. 7. The composition of claim 5 or 6, wherein the alkoxy-terminated polyether is a combination of a dialkoxy-terminated polyether and a trialkoxy-terminated polyether in a content weight ratio of 1:0.6-2; and/or the acryloyloxy silane is alpha- (methacryloyloxy) methyltriethoxysilane and/or gamma- (methacryloyloxy) propyltrimethoxysilane.
8. 8. The composition according to claim 5 or 6, wherein the auxiliary agents comprise antioxidants, fillers, water scavengers and coupling agents; The content of the antioxidant is 0.2-0.8 weight parts, the content of the filler is 120-180 weight parts, the content of the water remover is 2-5 weight parts, and the content of the coupling agent is 1.5-3 weight parts relative to 100 weight parts of the alkoxy end capped polyether; And/or the coupling agent is selected from at least one of gamma- (2, 3-epoxypropoxy) propyl trimethoxysilane, gamma-aminopropyl triethoxysilane, gamma- (beta-aminoethyl) aminopropyl trimethoxysilane, aniline methyl trimethoxysilane, gamma- (2, 3-epoxypropoxy) propyl triethoxysilane, ureido propyl trimethoxysilane and ureido propyl triethoxysilane; And/or the filler is at least one selected from nano calcium carbonate, talcum powder, fumed silica, heavy calcium carbonate, mica powder, titanium dioxide and carbon black.
9. 9. A method for preparing a silane-modified polyether waterproof coating, which is characterized in that the method is carried out by using the components in the composition according to any one of claims 5 to 8, and the method comprises the steps of stirring and mixing the components in the composition to obtain the silane-modified polyether waterproof coating.
10. 10. The silane-modified polyether waterproof coating prepared by the method according to claim 9.

Description

Plasticizer and preparation method thereof, composition for polyether waterproof coating and preparation method thereof Technical Field The invention relates to the field of building waterproofing, in particular to a plasticizer and a preparation method thereof, a composition for polyether waterproof coating, a polyether waterproof coating and a preparation method thereof. Background The silane modified polyether waterproof coating is a single-component solvent-free waterproof coating prepared by taking modified polyether resin as a base polymer and matching with functional additives, fillers, pigments and catalysts, and has the advantages of high elongation, high tensile strength, good low-temperature flexibility and the like. Silane polyether resins, also known as end silane modified polyether resins or silicone modified polyether resins, initially appear mainly in the form of end silane based polyether sealants, also known as MS sealants, silicone modified polyether sealants and modified silicone sealants. The silane polyether building waterproof coating is mainly used for waterproof and moistureproof of kitchen, bathroom, balcony and the like, is coated on a base layer when in use, and is cured through reaction with moisture to form a continuous seamless high-molecular elastic waterproof film. The silane modified polyether waterproof paint can be used for roofing, external wall and other parts under the condition of applying a proper protective layer. The paint can be applied to the surface of a piece of steel plate, and can be rolled, brushed and sprayed, and can be applied to the design thickness at one time, so that the time and the construction cost are saved. In the waterproof field of buildings, the weather-resistant silane modified polyether waterproof paint is widely applied to waterproof parts needing long-term exposure, such as outdoor buildings, infrastructure, special scenes and the like, has good weather resistance and high elasticity waterproof performance, resists outdoor severe conditions such as strong ultraviolet resistance, high and low temperature circulation resistance, water resistance and scouring resistance, solves the problems that the traditional exposed paint is easy to age, crack and leak, and is popularized as a novel waterproof paint. In addition, polyether polyol is used as the plasticizer in the market, the plasticizing effect is good, the product strength is high, the extension is large, and the like, but because the common polyether plasticizer belongs to hydrophilic molecules, the compatibility with a silane polyether system is limited, the condition of 'hydrophilic precipitation' is easy to occur under the condition of soaking, the polyether plasticizer migrates to the surface of a coating, the surface of the coating is sticky after soaking, oily matters are precipitated, the weight of a coating film is lost, the coating film is hard, shrink, and the like, and the coating film loses elasticity under severe conditions, and finally the use effect of the product is influenced. Therefore, it is of great significance to provide a new plasticizer suitable for silane modified polyether waterproof coating and a new silane modified polyether waterproof coating. Disclosure of Invention The invention aims to solve the problems of poor compatibility and weather resistance of the existing silane modified polyether waterproof coating. In order to achieve the above object, a first aspect of the present invention provides a method for producing a modified polyether plasticizer, which comprises, under a protective atmosphere, (1) In the presence of a base catalyst, stirring and mixing alpha, omega-dihydroxyl polydimethylsiloxane and alkylene oxide to obtain an intermediate I; (2) The neutralizing agent is contacted and mixed with the intermediate I to obtain the modified polyether plasticizer; The amount of the base catalyst is 0.1 to 1 part by weight, the amount of the alkylene oxide is 400 to 900 parts by weight, and the amount of the neutralizing agent is 0.12 to 1.2 parts by weight, relative to 100 parts by weight of the α, ω -dihydroxy polydimethylsiloxane. In a second aspect the present invention provides a modified polyether plasticizer prepared by the method of the first aspect described above. The third aspect of the invention provides a composition for silane modified polyether waterproof paint, which consists of a main agent and an auxiliary agent, wherein the main agent contains alkoxy end capped polyether, acryloyloxy silane and plasticizer; The content of the acryloxysilane is 2 to 3 parts by weight and the content of the plasticizer is 45 to 85 parts by weight relative to 100 parts by weight of the alkoxy-terminated polyether; the plasticizer is the modified polyether plasticizer according to the second aspect. In a fourth aspect, the invention provides a method for preparing a silane-modified polyether waterproof coating, the method is carried out by using the componen