A method for preparing a free radical, moisture dual-curing one-component silane-modified sealant

Abstract

The application provides a preparation method of a free radical and moisture dual-cured single-component silane modified sealant, in which unsaturated liquid rubber and polyether copolymerized silane modified polymers are prepared first, then silane modified polyether, fillers, water removing agents, coupling agents, unsaturated liquid rubber and polyether copolymerized silane modified polymers, initiators and curing accelerators are sequentially added into a reaction kettle, and after being fully mixed and uniformly distributed, an organic metal catalyst is added, and after being mixed and uniformly distributed, a vacuum is broken by nitrogen, and the product is discharged and packaged. In the preparation method, the unsaturated liquid rubber is introduced into the alkoxy-terminated polyether segment, and a peroxide is added to initiate a free radical reaction, so that the silane modified sealant can be moisture cured at room temperature and can be free radical cured in a high temperature environment.

Description

Technical Field

[0001] This invention provides a method for preparing a silane-modified adhesive, particularly a method for preparing a silane-modified adhesive that undergoes both free radical and moisture curing, belonging to the field of silane-modified adhesive preparation technology. Background Technology

[0002] Silane-modified sealants are now used in all aspects of our daily lives, especially in construction, home decoration, and industrial assembly. Silane-modified sealants are polymeric adhesives with a polyether alcohol backbone and hydrolyzable alkoxysilane end caps. Similar to one-component silicone sealants, they require the absorption of moisture from the air to cure.

[0003] When silane-modified sealant is used for bonding and sealing sheet metal welds, after the sealant is applied and the initial adhesion is formed, the weld needs to be sprayed with paint and baked in an oven at 150~180℃ for 30~40 minutes to cure the paint film. Under this high temperature environment, the silane-modified sealant is very prone to losing its activity, resulting in problems such as non-curing, softening, and foaming. Summary of the Invention

[0004] This invention provides a method for preparing a silane-modified sealant adhesive that is both free radical and moisture-cured, overcoming the shortcomings of the prior art. In this preparation method, unsaturated liquid rubber is introduced onto alkoxy-terminated polyether segments, and a free radical reaction is initiated by adding peroxides, so that the prepared silane-modified sealant can be moisture-cured at room temperature and free radical-cured at high temperature.

[0005] The technical solution adopted to achieve the above-mentioned objectives of this invention is as follows: A method for preparing a free radical, moisture-curing, single-component silane-modified sealant includes the following steps: (1) 10-100 parts by weight of silane-modified polymer copolymerized from unsaturated liquid rubber and polyether, 10-100 parts by weight of silane-modified polyether, 10-200 parts by weight of plasticizer, 0.1-1 parts by weight of ultraviolet absorber, 0.1-1 parts by weight of light stabilizer, 50-500 parts by weight of filler, and 0.1-10 parts by weight of dehydrating agent are added into the reactor. Under stirring and negative pressure conditions, the temperature is raised to the dehydration reaction temperature of 60-80℃ and kept at the temperature for 1-3 hours. The temperature is then raised to 90-120℃ and kept at the temperature for 1-3 hours. The silane-modified polymer copolymerized from unsaturated liquid rubber and polyether has the following structural formula: Where a and n = 1, 2, or 3; b and m = 0 or 1; c, d, e, f, g, and h are all greater than 0; (2) After cooling to room temperature, add 0.01~10 parts by weight of initiator, 1~20 parts by weight of dehydrating agent and 1~20 parts by weight of coupling agent to the reactor in sequence. After mixing thoroughly, add 0.01~10 parts by weight of curing accelerator and 0.1~2 parts by weight of organometallic catalyst. After mixing thoroughly, break the vacuum with nitrogen gas, discharge and package the material to obtain a single-component silane modified sealant that is cured by free radical and moisture.

[0006] Furthermore, the preparation method of the silane-modified polymer copolymerized from unsaturated liquid rubber and polyether is as follows: 10-100 parts by weight of unsaturated liquid rubber, 10-100 parts by weight of polyether alcohol, and 5-50 parts by weight of plasticizer are dehydrated at 100-120℃ under a negative pressure of -0.09MPa for 1-2 hours; after cooling to 50℃, 0.1-2 parts by weight of catalyst and 0.1-20 parts by weight of chain extender are weighed and added to a flask, which is then filled with a dry... Nitrogen gas was introduced and stirring was started. The reaction was carried out at 70~90℃ and -0.09MPa negative pressure for 1~3h. After cooling to below 50℃, 1~20 parts by mass of the end-capping agent and 0.01~2 parts by mass of the end-capping catalyst were weighed and added to the flask. Dry nitrogen gas was introduced and stirring was started. The reaction was carried out at 80~120℃ and -0.09MPa negative pressure for 1~8h until the reaction was completed, thus obtaining the silane-modified polymer of unsaturated liquid rubber and polyether copolymer.

[0007] Furthermore, the unsaturated liquid rubber is one or more of the following: hydroxyl-terminated polybutadiene liquid rubber, hydroxyl-terminated butadiene-acrylonitrile liquid rubber, carboxyl-terminated butadiene-acrylonitrile liquid rubber, isocyanate-terminated liquid rubber, epoxy-terminated polybutadiene liquid rubber, and epoxidized hydroxyl-terminated polybutadiene liquid rubber.

[0008] Furthermore, the polyether alcohol is one or both of the following: polyether alcohol with a molecular weight of 100-10000 and allyl polyether alcohol with a molecular weight of 100-10000.

[0009] Furthermore, the plasticizer is one or more of DINP, DIDP, DOTP, DTDP, TOTM, Mesamoll, DINCH, and polyether alcohols with a molecular weight of 100-10000.

[0010] Furthermore, the catalyst is one or more of the following: dibutyltin dilaurate, dibutyltin diacetate, stannous octoate, sodium hydroxide, and potassium hydroxide.

[0011] Furthermore, the chain extender is one or more of diphenylmethane diisocyanate, toluene diisocyanate, hexamethylene diisocyanate, dicyclohexylmethane diisocyanate, dichloromethane, 1,2-dichloroethane, and 1,3-dichloropropane.

[0012] Furthermore, the end-capping agent is one or more of isocyanate-methyltrimethoxysilane, isocyanate-methyltriethoxysilane, isocyanate-propyltrimethoxysilane, isocyanate-propyltriethoxysilane, methyldimethoxysilane, trimethoxysilane, 1-dimethyl-3-trimethoxydisiloxane, and 1-dimethyl-3-methyldimethoxydisiloxane; the end-capping catalyst is one or more of dibutyltin dilaurate, dibutyltin diacetate, stannous octoate, chloroplatinic acid, and diethylenetetramethyldisiloxane platinum salt.

[0013] Furthermore, the silane-modified polyether mentioned in step (1) is one or more of Zhongyuan S203H, S303H, SAX400, SAX750, Wacker E10, Wacker E35, and Wacker XB502. The plasticizer is one or more of DINP, DIDP, DOTP, DTDP, TOTM, Mesamoll, DINCH, and polyether alcohols with a molecular weight of 100-10000. The ultraviolet absorber is one or more of UV-326, UV-328, UV-329, UV-320, UV-324, UV-1130, UV-928, and UV-531; The light stabilizer is one or more of UV-123, UV-292, UV-622, UV-944, TAD, UV-119S, UV-2020, and UV-660; The filler is one or more of the following: heavy calcium carbonate, light calcium carbonate, nano calcium carbonate, fumed silica, diatomaceous earth, silica powder, and talc. The dehydrating agent is one or more of methyltrimethoxysilane, vinyltrimethoxysilane, tetramethoxysilane, tetraethoxysilane, isocyanate silane, calcium chloride, and magnesium chloride.

[0014] Furthermore, the initiator mentioned in step (2) is one or more of 2,5-dimethyl-2,5-di-(tert-butylperoxy)hexane, 2,4-dichlorobenzoyl peroxide, azobisisobutyronitrile, benzoyl peroxide, di-tert-butyl peroxide, tert-butyl peroxide, and diisopropylbenzene peroxide. The dehydrating agent is one or more of methyltrimethoxysilane, vinyltrimethoxysilane, tetramethoxysilane, tetraethoxysilane, isocyanate silane, calcium chloride, and magnesium chloride. The coupling agent is one or more of the following: aminopropyltrimethoxysilane, aminopropyltriethoxysilane, aminopropylaminoethyltrimethoxysilane, aminopropylaminoethyltriethoxysilane, epoxypropoxytriethoxysilane, and γ-methacryloyloxypropyltrimethoxysilane. The curing accelerator is one or more of the following: 2,4-dimethylpyridine, perdimethyldiphenylacetylimine, bis(2,2-morpholinoethyl) ether, bis(dimethylaminoethyl) ether, 1,8-diazabicyclo[5.4.0]undec-7-ene, tris(dimethylaminopropyl)hexahydrotriazine, N,N-dimethylaniline, and bis(dimethylaminoethyl) ether solution; The organometallic catalyst is one or more of the following: dibutyltin dilaurate, dibutyltin diacetate, stannous octoate, dibutyltin diacetylacetone, tert-butyl titanate complex, and ethyl acetoacetate titanium complex.

[0015] Compared with the prior art, the preparation method of the single-component silane-modified sealant with free radical and moisture dual curing provided by the present invention has the following advantages: In the present invention, by introducing unsaturated liquid rubber onto the alkoxy-terminated polyether segments, and by adding peroxide to initiate a free radical reaction, the prepared silane-modified sealant can be moisture-cured at room temperature and can achieve free radical curing at high temperature. Therefore, it can achieve free radical and moisture dual curing, thereby solving the problems of non-curing, softening, and foaming caused by high temperature in the prior art. Detailed Implementation

[0016] The present invention will now be described in detail with reference to specific embodiments, but the scope of protection of the present invention is not limited to the following embodiments.

[0017] Example 1

[0018] The preparation method provided in this embodiment is as follows: 30 parts by mass of hydroxyl-terminated polybutadiene liquid rubber, 70 parts by mass of 2000 molecular weight allyl polyether alcohol and 10 parts by mass of DOTP were dehydrated at 120℃ and -0.09 MPa negative pressure for 1 h, cooled to 50℃, 0.1 parts by mass of sodium hydroxide and 2 parts by mass of dichloromethane were weighed and added to a flask, dry nitrogen was introduced and stirring was started, and the reaction was carried out at 90℃ and -0.09 MPa negative pressure for 2 h, cooled to below 50℃, 4 parts by mass of 1-dimethyl-3-methyldimethoxydisiloxane and 0.01 parts by mass of diethylenetetramethyldisiloxane platinum salt were weighed and added to a flask, dry nitrogen was introduced and stirring was started, and the reaction was continued at 100℃ and -0.09 MPa negative pressure for 4 h until the reaction was completed, and a silane-modified polymer copolymerized from unsaturated liquid rubber and polyether was obtained.

[0019] 40 parts by weight of silane-modified polymer copolymerized from unsaturated liquid rubber and polyether, 60 parts by weight of silane-modified polyether Zhongyuan SAX750, 80 parts by weight of DOTP, 0.25 parts by weight of UV absorber UV-531, 0.25 parts by weight of light stabilizer UV-292, 200 parts by weight of nano calcium carbonate, and 5 parts by weight of vinyltrimethoxysilane were added to a reactor. Under stirring and vacuum conditions of -0.09 MPa, the temperature was raised to the dehydration reaction temperature of 60°C and held for 1 hour. The temperature was then raised to 110°C and held for 1 hour.

[0020] After cooling to room temperature, 0.05 parts by weight of 2,5-dimethyl-2,5-di-(tert-butylperoxy)hexane, 10 parts by weight of vinyltrimethoxysilane, and 10 parts by weight of aminopropylaminoethyltrimethoxysilane were added to the reactor in sequence. After thorough mixing, 0.1 parts by weight of dimethyldiphenylacetylimine and 0.3 parts by weight of diacetylacetone dibutyltin were added. After thorough mixing, the vacuum was broken with nitrogen, and the mixture was discharged and packaged to obtain a free radical and moisture-cured single-component silane-modified sealant.

[0021] Example 2

[0022] The preparation method provided in this embodiment is as follows: 30 parts by mass of carboxyl-terminated butadiene-acrylonitrile liquid rubber, 50 parts by mass of 2000 molecular weight polyether alcohol and 10 parts by mass of DIDP are dehydrated at 120℃ and -0.09 MPa negative pressure for 1 hour, cooled to 50℃, 0.05 parts by mass of stannous octoate and 2 parts by mass of toluene diisocyanate are weighed and added to a flask, dry nitrogen is introduced and stirring is started, and the reaction is carried out at 80℃ and -0.09 MPa negative pressure for 2 hours, cooled to below 50℃, 3 parts by mass of isocyanate-based methyltrimethoxysilane and 0.01 parts by mass of dibutyltin dilaurate are weighed and added to a flask, dry nitrogen is introduced and stirring is started, and the reaction is continued at 110℃ and -0.09 MPa negative pressure for 5 hours until the reaction is completed, to obtain a silane-modified polymer copolymerized from unsaturated liquid rubber and polyether.

[0023] 30 parts by weight of silane-modified polymer copolymerized from unsaturated liquid rubber and polyether, 70 parts by weight of silane-modified polyether Wacker E35, 80 parts by weight of DIDP, 0.35 parts by weight of UV absorber UV-329, 0.35 parts by weight of light stabilizer UV-622, 200 parts by weight of nano calcium carbonate, 5 parts by weight of fumed silica, and 6 parts by weight of vinyltrimethoxysilane were added to a reactor. Under stirring and vacuum conditions of -0.09 MPa, the temperature was raised to the dehydration reaction temperature of 60°C and held for 1 hour. The temperature was then raised to 100°C and held for 1 hour.

[0024] After cooling to room temperature, 0.08 parts by weight of tert-butyl peroxide, 6 parts by weight of isocyanate-based silane, and 10 parts by weight of aminopropyltrimethoxysilane were added to the reactor in sequence. After thorough mixing, 0.2 parts by weight of tris(dimethylaminopropyl)hexahydrotriazine and 0.1 parts by weight of stannous octoate were added. After thorough mixing, the vacuum was broken with nitrogen, and the mixture was discharged and packaged to obtain a free radical and moisture-cured single-component silane-modified sealant.

[0025] Example 3

[0026] The preparation method provided in this embodiment is as follows: 20 parts by mass of isocyanate-terminated liquid rubber, 20 parts by mass of epoxidized hydroxyl-terminated polybutadiene liquid rubber, 60 parts by mass of 1000 molecular weight allyl polyether alcohol, and 15 parts by mass of DINCH are dehydrated at 110°C and -0.09 MPa negative pressure for 1 hour, cooled to 50°C, 0.05 parts by mass of potassium hydroxide and 3 parts by mass of 1,3-dichloropropane are weighed and added to a flask, dry nitrogen is introduced and stirring is started, and the reaction is carried out at 80°C and -0.09 MPa negative pressure for 2 hours, cooled to below 50°C, 4 parts by mass of 1-dimethyl-3-trimethoxydisiloxane and 0.02 parts by mass of diethylenetetramethyldisiloxane platinum salt are weighed and added to a flask, dry nitrogen is introduced and stirring is started, and the reaction is continued at 100°C and -0.09 MPa negative pressure for 6 hours until the reaction is completed, thus obtaining a silane-modified polymer copolymerized from unsaturated liquid rubber and polyether.

[0027] 35 parts by weight of silane-modified polymer copolymerized from unsaturated liquid rubber and polyether, 65 parts by weight of silane-modified polyether Zhongyuan S303H, 60 parts by weight of DINCH, 0.3 parts by weight of UV absorber UV-326, 0.4 parts by weight of light stabilizer UV-123, 150 parts by weight of nano calcium carbonate, 70 parts by weight of heavy calcium carbonate, and 4 parts by weight of vinyltrimethoxysilane were added to a reaction vessel. Under stirring and vacuum conditions of -0.09 MPa, the temperature was raised to the dehydration reaction temperature of 70°C and held for 1 hour. The temperature was then raised to 100°C and held for 1 hour.

[0028] After cooling to room temperature, 0.1 parts by weight of 2,4-dichlorobenzoyl peroxide, 4 parts by weight of methyltrimethoxysilane, 5 parts by weight of vinyltrimethoxysilane, 5 parts by weight of aminopropyltrimethoxysilane, and 4 parts by weight of γ-methacryloyloxypropyltrimethoxysilane were added to the reactor in sequence. After thorough mixing, 0.05 parts by weight of bis(2,2-morpholinoethyl) ether and 0.5 parts by weight of dibutyltin dilaurate were added. After thorough mixing, the vacuum was broken with nitrogen, and the mixture was discharged and packaged to obtain a free radical and moisture-cured single-component silane-modified sealant.

[0029] Comparative Example 1

[0030] The preparation method provided in this embodiment is as follows: 100 parts by mass of 4000 molecular weight allyl polyether alcohol were dehydrated at 110℃ and -0.09 MPa negative pressure for 1 h, cooled to 50℃, 0.05 parts by mass of potassium hydroxide and 3 parts by mass of 1,3-dichloropropane were weighed and added to a flask, dry nitrogen was introduced and stirring was started, and the reaction was carried out at 80℃ and -0.09 MPa negative pressure for 2 h, cooled to below 50℃, 4 parts by mass of 1-dimethyl-3-trimethoxydisiloxane and 0.02 parts by mass of diethylenetetramethyldisiloxane platinum salt were weighed and added to a flask, dry nitrogen was introduced and stirring was started, and the reaction was continued at 100℃ and -0.09 MPa negative pressure for 6 h until the reaction was completed, and the silane modified polyether polymer was obtained.

[0031] 30 parts by weight of silane-modified polyether polymer, 70 parts by weight of silane-modified polyether SAX750, 40 parts by weight of DINP, 40 parts by weight of 2000 molecular weight polyether alcohol, 0.4 parts by weight of UV absorber UV-531, 0.4 parts by weight of light stabilizer UV-622, 150 parts by weight of nano calcium carbonate, 100 parts by weight of light calcium carbonate, and 6 parts by weight of vinyltrimethoxysilane were added to a reactor. Under stirring and vacuum conditions of -0.09 MPa, the temperature was raised to the dehydration reaction temperature of 60°C and held for 1 hour. The temperature was then raised to 110°C and held for 1 hour.

[0032] After cooling to room temperature, 0.1 parts by weight of 2,5-dimethyl-2,5-di-(tert-butylperoxy)hexane, 10 parts by weight of vinyltrimethoxysilane, and 10 parts by weight of aminopropyltrimethoxysilane were added to the reactor in sequence. After thorough mixing, 0.25 parts by weight of bis(2,2-morpholinoethyl) ether and 0.25 parts by weight of diacetylacetone dibutyltin were added. After thorough mixing, the vacuum was broken with nitrogen, and the mixture was discharged and packaged to obtain a free radical and moisture-cured single-component silane-modified sealant.

[0033] Comparative Example 2

[0034] The preparation method provided in this embodiment is as follows: 100 parts by weight of silane-modified polyether Wacker E35, 60 parts by weight of 4000 molecular weight polyether alcohol, 0.4 parts by weight of UV absorber UV-531, 0.4 parts by weight of light stabilizer UV-660, 120 parts by weight of heavy calcium carbonate, 80 parts by weight of light calcium carbonate, 6 parts by weight of fumed silica, and 5 parts by weight of vinyltrimethoxysilane are added into a reaction vessel. Under stirring and vacuum conditions of -0.09 MPa, the temperature is raised to the dehydration reaction temperature of 70°C and held for 1 hour. The temperature is then raised to 100°C and held for 1 hour.

[0035] After cooling to room temperature, 8 parts by weight of vinyltrimethoxysilane and 10 parts by weight of aminopropylaminoethyltrimethoxysilane are added to the reactor in sequence. After mixing thoroughly, 0.25 parts by weight of bis(dimethylaminoethyl) ether solution and 0.2 parts by weight of dibutyltin dilaurate are added. After mixing thoroughly, the vacuum is broken with nitrogen gas, and the product is discharged and packaged to obtain a free radical and moisture-cured single-component silane modified sealant.

[0036] The products obtained in Examples 1 and 2, as well as Comparative Examples 1 and 2, were subjected to performance testing experiments. The results are shown in the table below: .

[0037] As can be seen from the comparison table above, the free radical, moisture-cured single-component silane-modified sealant prepared in this invention can cure normally and form adhesive strength after 7 days of curing at room temperature, which is comparable to the performance of the products prepared in Comparative Examples 1 and 2. However, when cured at high temperatures of 150℃ for 40 minutes and 180℃ for 30 minutes, the hardness, tensile strength, and adhesive strength of the sealants in Examples 1 and 2 are significantly improved, while the silane-modified sealants in Comparative Examples 1 and 2 show a greater decline in various properties at temperatures of 150℃ and 180℃.

Claims

1. A method for preparing a free radical, moisture-cured, single-component silane-modified sealant, characterized in that... Includes the following steps: (1) 10-100 parts by weight of silane-modified polymer copolymerized from unsaturated liquid rubber and polyether, 10-100 parts by weight of silane-modified polyether, 10-200 parts by weight of plasticizer, 0.1-1 parts by weight of ultraviolet absorber, 0.1-1 parts by weight of light stabilizer, 50-500 parts by weight of filler, and 0.1-10 parts by weight of dehydrating agent are added into the reactor. Under stirring and negative pressure, the temperature is raised to the dehydration reaction temperature of 60-80℃ and kept at the temperature for 1-3 hours. The temperature is then raised to 90-120℃ and kept at the temperature for 1-3 hours. The silane-modified polymer copolymerized from unsaturated liquid rubber and polyether has the following structural formula: Where a and n = 1, 2, or 3; b and m = 0 or 1; c, d, e, f, g, and h are all greater than 0; the preparation method of the silane-modified polymer copolymerized from unsaturated liquid rubber and polyether is as follows: 10-100 parts by weight of unsaturated liquid rubber, 10-100 parts by weight of polyether alcohol, and 5-50 parts by weight of plasticizer are dehydrated at 100-120℃ and under a negative pressure of -0.09MPa for 1-2 hours; after cooling to 50℃, 0.01-2 parts by weight of catalyst and 0.1-20 parts by weight of chain extender are weighed and added to a flask. Dry nitrogen gas was introduced and stirring was started. The reaction was carried out at 70~90℃ and -0.09MPa negative pressure for 1~3 hours. After cooling to below 50℃, 1~20 parts by weight of the end-capping agent and 0.01~2 parts by weight of the end-capping catalyst were weighed and added to the flask. Dry nitrogen gas was introduced and stirring was started. The reaction was carried out at 80~120℃ and -0.09MPa negative pressure for 1~8 hours until the reaction was completed, thus obtaining the silane-modified polymer copolymerized from unsaturated liquid rubber and polyether; the unsaturated liquid rubber is hydroxyl-terminated polybutadiene liquid rubber. (2) After cooling to room temperature, add 0.01~10 parts by weight of initiator, 1~20 parts by weight of dehydrating agent and 1~20 parts by weight of coupling agent to the reactor in sequence. After mixing thoroughly, add 0.01~10 parts by weight of curing accelerator and 0.1~2 parts by weight of organometallic catalyst. After mixing thoroughly, break the vacuum with nitrogen gas, discharge and package the material to obtain a single-component silane modified sealant that is cured by free radical and moisture.

2. The preparation method of the free radical and moisture-cured single-component silane-modified sealant according to claim 1, characterized in that: The polyether alcohol is one or both of the following: polyether alcohol with a molecular weight of 100-10000 and allyl polyether alcohol with a molecular weight of 100-10000.

3. The preparation method of the free radical and moisture-cured single-component silane-modified sealant according to claim 1, characterized in that: The plasticizer is one or more of DINP, DIDP, DOTP, DTDP, TOTM, Mesamoll, DINCH, and polyether alcohols with a molecular weight of 100-10000.

4. The preparation method of the free radical and moisture-cured single-component silane-modified sealant according to claim 1, characterized in that: The catalyst is one or more of the following: dibutyltin dilaurate, dibutyltin diacetate, stannous octoate, sodium hydroxide, and potassium hydroxide.

5. The preparation method of the free radical and moisture-cured single-component silane-modified sealant according to claim 1, characterized in that: The chain extender is one or more of diphenylmethane diisocyanate, toluene diisocyanate, hexamethylene diisocyanate, dicyclohexylmethane diisocyanate, dichloromethane, 1,2-dichloroethane, and 1,3-dichloropropane.

6. The preparation method of the free radical and moisture-cured single-component silane-modified sealant according to claim 1, characterized in that: The end-capping agent is one or more of isocyanate-methyltrimethoxysilane, isocyanate-methyltriethoxysilane, isocyanate-propyltrimethoxysilane, isocyanate-propyltriethoxysilane, methyldimethoxysilane, trimethoxysilane, 1-dimethyl-3-trimethoxydisiloxane, and 1-dimethyl-3-methyldimethoxydisiloxane; the end-capping catalyst is one or more of dibutyltin dilaurate, dibutyltin diacetate, stannous octoate, chloroplatinic acid, and diethylenetetramethyldisiloxane platinum salt.

7. The preparation method of the free radical and moisture-cured single-component silane-modified sealant according to claim 1, characterized in that: The silane-modified polyether mentioned in step (1) is one or more of the following: Zhongyuan S203H, S303H, SAX400, SAX750, Wacker E10, Wacker E35, and Wacker XB502; The plasticizer is one or more of DINP, DIDP, DOTP, DTDP, TOTM, Mesamoll, DINCH, and polyether alcohols with a molecular weight of 100-10000. The ultraviolet absorber is one or more of UV-326, UV-328, UV-329, UV-320, UV-324, UV-1130, UV-928, and UV-531; The light stabilizer is one or more of UV-123, UV-292, UV-622, UV-944, TAD, UV-119S, UV-2020, and UV-660; The filler is one or more of the following: heavy calcium carbonate, light calcium carbonate, nano calcium carbonate, fumed silica, diatomaceous earth, silica powder, and talc. The dehydrating agent is one or more of methyltrimethoxysilane, vinyltrimethoxysilane, tetramethoxysilane, tetraethoxysilane, calcium chloride, and magnesium chloride.

8. The method for preparing the free radical, moisture-cured, single-component silane-modified sealant according to claim 1, characterized in that: The initiator mentioned in step (2) is one or more of the following: 2,5-dimethyl-2,5-di-(tert-butylperoxy)hexane, 2,4-dichlorobenzoyl peroxide, azobisisobutyronitrile, benzoyl peroxide, di-tert-butyl peroxide, tert-butyl peroxide, and diisopropylbenzene peroxide. The dehydrating agent is one or more of methyltrimethoxysilane, vinyltrimethoxysilane, tetramethoxysilane, tetraethoxysilane, calcium chloride, and magnesium chloride. The coupling agent is one or more of the following: aminopropyltrimethoxysilane, aminopropyltriethoxysilane, aminopropylaminoethyltrimethoxysilane, aminopropylaminoethyltriethoxysilane, epoxypropoxytriethoxysilane, and γ-methacryloyloxypropyltrimethoxysilane. The curing accelerator is one or more of the following: 2,4-dimethylpyridine, bis(2,2-morpholinoethyl) ether, bis(dimethylaminoethyl) ether, 1,8-diazabicyclo[5.4.0]undec-7-ene, tris(dimethylaminopropyl)hexahydrotriazine, N,N-dimethylaniline, and bis(dimethylaminoethyl) ether solution; The organometallic catalyst is one or more of the following: dibutyltin dilaurate, dibutyltin diacetate, stannous octoate, dibutyltin diacetylacetone, tert-butyl titanate complex, and ethyl acetoacetate titanium complex.

Images