CN116948502A - A silane-modified polyether waterproof coating and its preparation method - Google Patents

Abstract

The invention relates to the technical field of waterproof paint, and provides silane modified polyether waterproof paint and a preparation method thereof, wherein the silane modified polyether waterproof paint comprises the following components in parts by weight: 100 parts of silane modified polyether, 10-30 parts of filler, 1-3 parts of coupling agent, 0.5-1 part of dimethyl cyclohexylamine, 0.5-1 part of cyclohexene imine and 1-2 parts of antioxidant; the silane modified polyether comprises the following components in parts by weight: 100 parts of butylene oxide, 15-25 parts of pentaerythritol, 10-20 parts of maltotetraose, 5-15 parts of vinyl methyl diethoxy silane and 1-3 parts of catalyst. Through the technical scheme, the problems of poor waterproof property and low strength of the polyether coating in the prior art are solved.

Description

A silane-modified polyether waterproof coating and its preparation method

Technical field

The present invention relates to the technical field of waterproof coatings. Specifically, it relates to a silane-modified polyether waterproof coating and a preparation method thereof.

Background technique

Waterproof coating refers to a coating that can form a waterproof film with certain extensibility, elastic plasticity, crack resistance, impermeability and weather resistance after curing, and plays a waterproof, anti-seepage and protective role. Waterproof coatings are mostly used on building roofs, basements, kitchens and bathrooms, underground garages, reservoirs and other parts to prevent rainwater, groundwater, industrial and civil water supply and drainage, as well as moisture and steam in the air from intruding into the building. Among the currently used building waterproof coatings on the market, polyurethane waterproof coatings, polymer cement waterproof coatings, acrylic waterproof coatings, and modified asphalt waterproof coatings are the main ones. However, most waterproof coatings, especially polyurethane and asphalt waterproof coatings, contain relatively large amounts of water. There are many harmful components, which is not in line with the development trend of environmental protection in building materials.

Polyether coatings have the advantages of low viscosity, low toxicity, safe and reliable use, good processability, and are in line with the development trend of environmentally friendly coatings and building materials. They have broad application prospects. However, they have low strength, are easy to absorb moisture, and are easy to absorb air. The moisture in it affects its performance and service life, which limits its development to a certain extent.

Contents of the invention

The invention proposes a silane-modified polyether waterproof coating and a preparation method thereof, which solves the problems of poor waterproofness and low strength of polyether coatings in related technologies.

The technical solution of the present invention is as follows:

The invention proposes a silane-modified polyether waterproof coating, which includes the following components by weight: 100 parts of silane-modified polyether, 10 to 30 parts of filler, 1 to 3 parts of coupling agent, and 0.5 parts of dimethylcyclohexylamine. ~1 part, 0.5~1 part of cyclohexenimine, 1~2 parts of antioxidant;

Silane modified polyether includes the following components by weight: 100 parts of butylene oxide, 15 to 25 parts of pentaerythritol, 10 to 20 parts of maltotetraose, 5 to 15 parts of vinyl methyl diethoxysilane, and 1 catalyst ~3 servings.

As a further technical solution, the filler is one or more of talc powder, quartz powder and kaolin.

As a further technical solution, the coupling agent is one or more of epoxy silane, methacryloxy silane, and methoxy silane.

As a further technical solution, the antioxidant is one or more of antioxidant 246, antioxidant 1010, antioxidant 168 and antioxidant 164.

As a further technical solution, the catalyst is an organic amine catalyst.

As a further technical solution, the preparation method of the silane-modified polyether includes the following steps:

S1. In a nitrogen atmosphere, stir and premix butylene oxide, pentaerythritol, and maltotetose, and dehydrate and dry at 120~130°C for 100~120 minutes to obtain a premix;

S2. Cool the premix to 90~100°C, add catalyst and vinylmethyldiethoxysilane and stir for 60~150min. Cool the premix to 80~90°C and continue the reaction for 60~120min to obtain silane modification. polyether.

The invention also proposes a preparation method of silane-modified polyether waterproof coating, which includes the following steps:

A1. Mix the filler and antioxidant evenly, and dehydrate and dry under 120°C and vacuum conditions to obtain mixture A;

A2. Under vacuum conditions, lower the temperature to 70~80°C, mix the silane-modified polyether and the mixture A, then add dimethylcyclohexylamine, cyclohexenimine, and coupling agent and stir evenly to obtain Silane modified polyether waterproof coating.

As a further technical solution, the mixing time in A1 is 30 to 60 minutes.

As a further technical solution, the vacuum degrees in A1 and A2 under vacuum conditions are both <-0.08Mpa.

As a further technical solution, the mixing time in A2 is 40 to 80 minutes, and the stirring time is 30 to 40 minutes.

The working principle and beneficial effects of the present invention are:

In the present invention, vinylmethyldiethoxysilane is used for modification to obtain a silane-modified polyether, and then combined with the synergistic effect of dimethylcyclohexylamine and cyclohexenimine, the preparation efficiency is improved, and finally A silane-modified polyether waterproof coating with Si-O-Si bonds as network cross-linking points was obtained, which has the advantages of excellent waterproof performance and high strength; and the silane-modified polyether is compounded with pentaerythritol and maltotetraose, which has a synergistic effect. As the initiator of butylene oxide, vinylmethyldiethoxysilane is used to seal it with a siloxy group, which significantly improves the waterproofness of the silane-modified polyether waterproof coating.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts fall within the scope of protection of the present invention.

Example 1

A silane-modified polyether waterproof coating includes the following components by weight: 100 parts of silane-modified polyether, 10 parts of kaolin, 1 part of epoxy silane, 0.5 parts of dimethylcyclohexylamine, cyclohexene 0.5 part of amine, 1 part of antioxidant 246;

The silane-modified polyether includes the following components by weight: 100 parts of butylene oxide, 15 parts of pentaerythritol, 10 parts of maltotetraose, 5 parts of vinylmethyldiethoxysilane, and 1 part of tert-butylamine.

The preparation method of silane-modified polyether includes the following steps:

S1. In a nitrogen atmosphere, stir and premix butylene oxide, pentaerythritol, and maltotetraose, and dehydrate and dry at 120°C for 120 minutes to obtain a premix;

S2. Cool the premix to 90°C, add tert-butylamine and vinylmethyldiethoxysilane, stir and react for 150 minutes, lower the temperature to 80°C and continue the reaction for 120 minutes to obtain a silane-modified polyether.

A preparation method of silane-modified polyether waterproof coating, including the following steps:

A1. Mix kaolin and antioxidant 246 evenly for 30 minutes, dehydrate and dry under vacuum conditions of 120°C and a vacuum degree of -0.09Mpa to obtain mixture A;

A2. Under vacuum conditions with a vacuum degree of -0.09Mpa, lower the temperature to 70°C, mix the silane-modified polyether resin and the mixture A for 80 minutes, and then add dimethylcyclohexylamine, cyclohexenimine, Stir the epoxy silane for 40 minutes to obtain a silane-modified polyether waterproof coating.

Example 2

A silane-modified polyether waterproof coating includes the following components by weight: 100 parts of silane-modified polyether, 20 parts of quartz powder, 2 parts of methoxysilane, 0.75 parts of dimethylcyclohexylamine, and cyclohexene 0.75 parts of imine, 1.5 parts of antioxidant 1010;

The silane-modified polyether includes the following components by weight: 100 parts of butylene oxide, 20 parts of pentaerythritol, 15 parts of maltotetraose, 10 parts of vinylmethyldiethoxysilane, and 2 parts of diethylamine.

The preparation method of silane-modified polyether includes the following steps:

S1. In a nitrogen atmosphere, stir and premix butylene oxide, pentaerythritol, and maltotetraose, and dehydrate and dry at 125°C for 110 minutes to obtain a premix;

S2. Cool the premix to 95°C, add diethylamine and vinylmethyldiethoxysilane, stir and react for 100 minutes, lower the temperature to 85°C and continue the reaction for 90 minutes to obtain a silane-modified polyether.

A preparation method of silane-modified polyether waterproof coating, including the following steps:

A1. Mix quartz powder and antioxidant 1010 evenly for 45 minutes, and perform dehydration and drying under vacuum conditions of 120°C and a vacuum degree of -0.10Mpa to obtain mixture A;

A2. Under vacuum conditions with a vacuum degree of -0.10Mpa, lower the temperature to 75°C, mix the silane-modified polyether resin and the mixture A for 60 minutes, and then add dimethylcyclohexylamine, cyclohexenimine, Stir the methoxysilane for 35 minutes to obtain a silane-modified polyether waterproof coating.

Example 3

A silane-modified polyether waterproof coating includes the following components by weight: 100 parts of silane-modified polyether, 30 parts of talc, 3 parts of methacryloxysilane, 1 part of dimethylcyclohexylamine, 1 part of cyclohexenimine, 2 parts of antioxidant 168;

The silane-modified polyether includes the following components by weight: 100 parts of butylene oxide, 25 parts of pentaerythritol, 20 parts of maltotetraose, 15 parts of vinylmethyldiethoxysilane, and 3 parts of hexamethylenediamine.

The preparation method of silane-modified polyether includes the following steps:

S1. In a nitrogen atmosphere, stir and premix butylene oxide, pentaerythritol, and maltotetraose, and dehydrate and dry at 130°C for 100 minutes to obtain a premix;

S2. Cool the premix to 100°C, add hexamethylenediamine and vinylmethyldiethoxysilane to stir and react for 60 minutes, lower the temperature to 90°C and continue the reaction for 60 minutes to obtain a silane-modified polyether.

A preparation method of silane-modified polyether waterproof coating, including the following steps:

A1. Mix talc powder and antioxidant 168 evenly for 60 minutes, and perform dehydration and drying under vacuum conditions of 120°C and a vacuum degree of -0.09Mpa to obtain mixture A;

A2. Under vacuum conditions with a vacuum degree of -0.09Mpa, cool down to 80°C, mix the silane-modified polyether resin and the mixture A for 40 minutes, then add dimethylcyclohexylamine, cyclohexenimine, Methacryloyloxysilane was stirred for 30 minutes to obtain a silane-modified polyether waterproof coating.

Comparative example 1

The only difference between this comparative example and Example 3 is that only 2 parts of dimethylcyclohexylamine are added and cyclohexenimine is not added.

Comparative example 2

The only difference between this comparative example and Example 3 is that only 2 parts of cyclohexenimine is added and no dimethylcyclohexylamine is added.

Comparative example 3

The only difference between this comparative example and Example 3 is that only 45 parts of pentaerythritol are added and maltotetraose is not added.

Comparative example 4

The only difference between this comparative example and Example 3 is that only 45 parts of maltotetraose is added and pentaerythritol is not added.

Comparative example 5

The only difference between this comparative example and Example 3 is that the polyether is not modified with silane, that is, the polyether is prepared by the following method:

S1. Under a nitrogen atmosphere, stir and premix 100 parts of butylene oxide, 25 parts of pentaerythritol, and 20 parts of maltotetraose, and dehydrate and dry at 130°C for 100 minutes to obtain a premix;

S2. Cool the premix to 100°C, add 3 parts of hexamethylenediamine, stir and react for 60 minutes, lower the temperature to 90°C and continue the reaction for 60 minutes to obtain polyether.

Comparative example 6

The only difference between this comparative example and Example 3 is that vinylmethyldiethoxysilane was changed to r-aminopropyltriethoxysilane.

According to the coating film preparation and performance testing methods in the standard GB/T 16777-2008 "Test Methods for Building Waterproof Coatings", the silane-modified polyether waterproof coatings of Examples 1 to 3 and Comparative Examples 1 to 6 were sealed and placed for 24 hours respectively. , coated in the mold to make a coating film with a thickness of about 1.5mm. After leaving it for 7 days under standard test conditions, the tensile properties, tear strength and water impermeability of the coating film were tested. The measured results are as shown in Table 1 shown.

Table 1 Performance test results of silane-modified polyether waterproof coating

By comparing the data of Example 3, Comparative Example 5 and Comparative Example 6, it was found that vinylmethyldiethoxysilane was used for modification to obtain a silane-modified polyether, which has higher waterproofness and strength; implemented by comparison The data of Example 3 and Comparative Examples 1~2 found that the tensile strength, tear strength and waterproofness in Example 3 were all better than those of Comparative Examples 1~2, indicating that dimethylcyclohexylamine and cyclohexenimine have The synergistic effect not only improves the preparation efficiency, but also makes the silane-modified polyether waterproof coating have the advantages of excellent waterproof performance and high strength; by comparing the data of Example 3 and Comparative Examples 3~4, it is found that when using silane-modified polyether Pentaerythritol and maltotetraose are compounded, and the strength and waterproofness of Example 3 are better than those of Comparative Examples 3 to 4, indicating that pentaerythritol and maltotetraose are combined to obtain a multifunctional polyether, and then combined with vinyl methyl diethoxy After silane is capped with siloxy groups, the waterproofness and strength of the silane-modified polyether waterproof coating are significantly improved.

The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention. within.

Claims (10)

1. The silane modified polyether waterproof coating is characterized by comprising the following components in parts by weight: 100 parts of silane modified polyether, 10-30 parts of filler, 1-3 parts of coupling agent, 0.5-1 part of dimethyl cyclohexylamine, 0.5-1 part of cyclohexene imine and 1-2 parts of antioxidant;

the silane modified polyether comprises the following components in parts by weight: 100 parts of butylene oxide, 15-25 parts of pentaerythritol, 10-20 parts of maltotetraose, 5-15 parts of vinyl methyl diethoxy silane and 1-3 parts of catalyst.

2. The silane-modified waterproof polyether coating according to claim 1, wherein the filler is one or more of talcum powder, quartz powder and kaolin.

3. The silane-modified polyether waterproof paint of claim 1, wherein the coupling agent is one or more of epoxy silane, methacryloxy silane and methoxy silane.

4. The silane-modified, polyether water-resistant coating of claim 1, wherein said antioxidant is one or more of antioxidant 246, antioxidant 1010, antioxidant 168 and antioxidant 164.

5. The silane-modified polyether waterproof paint of claim 1, wherein the catalyst is an organic amine catalyst.

6. The silane-modified polyether waterproof paint according to claim 1, wherein the preparation method of the silane-modified polyether comprises the following steps:

s1, stirring and premixing butylene oxide, pentaerythritol and maltotetraose in a nitrogen atmosphere, and dehydrating and drying at 120-130 ℃ for 100-120 min to obtain a premix;

s2, cooling the premix to 90-100 ℃, adding a catalyst and vinyl methyl diethoxy silane, stirring and reacting for 60-150 min, cooling to 80-90 ℃ and continuing to react for 60-120 min to obtain silane modified polyether.

7. The preparation method of the silane modified polyether waterproof coating according to any one of claims 1 to 6, which is characterized by comprising the following steps:

a1, uniformly mixing a filler and an antioxidant, and dehydrating and drying at 120 ℃ under vacuum conditions to obtain a mixture A;

and A2, cooling to 70-80 ℃ under vacuum condition, mixing the silane modified polyether with the mixture A, and then adding the dimethylcyclohexylamine, cyclohexene imine and the coupling agent to stir uniformly to obtain the silane modified polyether waterproof coating.

8. The preparation method of the silane modified polyether waterproof paint according to claim 7, wherein the mixing time in the A1 is 30-60 min.

9. The preparation method of the silane modified polyether waterproof paint according to claim 7, wherein the vacuum degree of the A1 and the A2 under the vacuum condition is less than-0.08 Mpa.

10. The preparation method of the silane modified polyether waterproof coating according to claim 7, wherein the mixing time in the A2 is 40-80 min, and the stirring time is 30-40 min.