CN117801753A - Silicone sealant for glass curtain wall and preparation method thereof - Google Patents
Silicone sealant for glass curtain wall and preparation method thereof Download PDFInfo
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- CN117801753A CN117801753A CN202311769770.8A CN202311769770A CN117801753A CN 117801753 A CN117801753 A CN 117801753A CN 202311769770 A CN202311769770 A CN 202311769770A CN 117801753 A CN117801753 A CN 117801753A
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- 239000004590 silicone sealant Substances 0.000 title claims abstract description 51
- 239000011521 glass Substances 0.000 title claims abstract description 45
- 238000002360 preparation method Methods 0.000 title abstract description 21
- 239000011256 inorganic filler Substances 0.000 claims abstract description 58
- 229910003475 inorganic filler Inorganic materials 0.000 claims abstract description 58
- CQEYYJKEWSMYFG-UHFFFAOYSA-N butyl acrylate Chemical compound CCCCOC(=O)C=C CQEYYJKEWSMYFG-UHFFFAOYSA-N 0.000 claims abstract description 36
- 239000000945 filler Substances 0.000 claims abstract description 28
- 229920000578 graft copolymer Polymers 0.000 claims abstract description 27
- 239000012766 organic filler Substances 0.000 claims abstract description 24
- 239000004721 Polyphenylene oxide Substances 0.000 claims abstract description 20
- MWYMHZINPCTWSB-UHFFFAOYSA-N dimethylsilyloxy-dimethyl-trimethylsilyloxysilane Chemical class C[SiH](C)O[Si](C)(C)O[Si](C)(C)C MWYMHZINPCTWSB-UHFFFAOYSA-N 0.000 claims abstract description 20
- 229920000570 polyether Polymers 0.000 claims abstract description 20
- 239000002994 raw material Substances 0.000 claims abstract description 14
- 239000003963 antioxidant agent Substances 0.000 claims abstract description 13
- 230000003078 antioxidant effect Effects 0.000 claims abstract description 13
- 239000003054 catalyst Substances 0.000 claims abstract description 13
- 239000003431 cross linking reagent Substances 0.000 claims abstract description 13
- 239000005038 ethylene vinyl acetate Substances 0.000 claims description 34
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 claims description 34
- 238000003756 stirring Methods 0.000 claims description 31
- 238000002156 mixing Methods 0.000 claims description 30
- 239000010456 wollastonite Substances 0.000 claims description 30
- 229910052882 wollastonite Inorganic materials 0.000 claims description 30
- 239000010445 mica Substances 0.000 claims description 28
- 229910052618 mica group Inorganic materials 0.000 claims description 28
- 238000000034 method Methods 0.000 claims description 20
- 239000002245 particle Substances 0.000 claims description 18
- 239000002202 Polyethylene glycol Substances 0.000 claims description 15
- 229920001223 polyethylene glycol Polymers 0.000 claims description 15
- OMPJBNCRMGITSC-UHFFFAOYSA-N Benzoylperoxide Chemical compound C=1C=CC=CC=1C(=O)OOC(=O)C1=CC=CC=C1 OMPJBNCRMGITSC-UHFFFAOYSA-N 0.000 claims description 7
- 238000001035 drying Methods 0.000 claims description 7
- 239000004342 Benzoyl peroxide Substances 0.000 claims description 6
- 235000019400 benzoyl peroxide Nutrition 0.000 claims description 6
- DQXBYHZEEUGOBF-UHFFFAOYSA-N but-3-enoic acid;ethene Chemical compound C=C.OC(=O)CC=C DQXBYHZEEUGOBF-UHFFFAOYSA-N 0.000 claims description 6
- 238000010438 heat treatment Methods 0.000 claims description 6
- DKGZKEKMWBGTIB-UHFFFAOYSA-N [diacetyloxy(propyl)silyl] acetate Chemical group CCC[Si](OC(C)=O)(OC(C)=O)OC(C)=O DKGZKEKMWBGTIB-UHFFFAOYSA-N 0.000 claims description 5
- 238000001914 filtration Methods 0.000 claims description 5
- 125000004108 n-butyl group Chemical group [H]C([H])([H])C([H])([H])C([H])([H])C([H])([H])* 0.000 claims description 4
- 229920006122 polyamide resin Polymers 0.000 claims description 4
- BGYHLZZASRKEJE-UHFFFAOYSA-N [3-[3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoyloxy]-2,2-bis[3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoyloxymethyl]propyl] 3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoate Chemical group CC(C)(C)C1=C(O)C(C(C)(C)C)=CC(CCC(=O)OCC(COC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)(COC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)COC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)=C1 BGYHLZZASRKEJE-UHFFFAOYSA-N 0.000 claims description 3
- 238000005187 foaming Methods 0.000 abstract description 6
- 239000000565 sealant Substances 0.000 description 39
- 230000001070 adhesive effect Effects 0.000 description 23
- 230000009286 beneficial effect Effects 0.000 description 12
- 230000008569 process Effects 0.000 description 9
- 230000015572 biosynthetic process Effects 0.000 description 8
- 238000010276 construction Methods 0.000 description 8
- 239000003292 glue Substances 0.000 description 8
- 230000000052 comparative effect Effects 0.000 description 7
- 239000000853 adhesive Substances 0.000 description 6
- 238000012360 testing method Methods 0.000 description 5
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 239000006260 foam Substances 0.000 description 4
- 239000000758 substrate Substances 0.000 description 4
- 229920000858 Cyclodextrin Polymers 0.000 description 3
- 239000001116 FEMA 4028 Substances 0.000 description 3
- 229910018557 Si O Inorganic materials 0.000 description 3
- WHGYBXFWUBPSRW-FOUAGVGXSA-N beta-cyclodextrin Chemical compound OC[C@H]([C@H]([C@@H]([C@H]1O)O)O[C@H]2O[C@@H]([C@@H](O[C@H]3O[C@H](CO)[C@H]([C@@H]([C@H]3O)O)O[C@H]3O[C@H](CO)[C@H]([C@@H]([C@H]3O)O)O[C@H]3O[C@H](CO)[C@H]([C@@H]([C@H]3O)O)O[C@H]3O[C@H](CO)[C@H]([C@@H]([C@H]3O)O)O3)[C@H](O)[C@H]2O)CO)O[C@@H]1O[C@H]1[C@H](O)[C@@H](O)[C@@H]3O[C@@H]1CO WHGYBXFWUBPSRW-FOUAGVGXSA-N 0.000 description 3
- 235000011175 beta-cyclodextrine Nutrition 0.000 description 3
- 229960004853 betadex Drugs 0.000 description 3
- 229920001577 copolymer Polymers 0.000 description 3
- 238000011056 performance test Methods 0.000 description 3
- 229920001296 polysiloxane Polymers 0.000 description 3
- LIVNPJMFVYWSIS-UHFFFAOYSA-N silicon monoxide Inorganic materials [Si-]#[O+] LIVNPJMFVYWSIS-UHFFFAOYSA-N 0.000 description 3
- 238000005054 agglomeration Methods 0.000 description 2
- 230000002776 aggregation Effects 0.000 description 2
- 238000010009 beating Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000004132 cross linking Methods 0.000 description 2
- 238000005034 decoration Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- RTZKZFJDLAIYFH-UHFFFAOYSA-N ether Substances CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 238000009776 industrial production Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 229920000642 polymer Polymers 0.000 description 2
- -1 polysiloxane Polymers 0.000 description 2
- 230000009257 reactivity Effects 0.000 description 2
- 241001539473 Euphoria Species 0.000 description 1
- 206010015535 Euphoric mood Diseases 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000002390 adhesive tape Substances 0.000 description 1
- 238000000498 ball milling Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- YGANSGVIUGARFR-UHFFFAOYSA-N dipotassium dioxosilane oxo(oxoalumanyloxy)alumane oxygen(2-) Chemical compound [O--].[K+].[K+].O=[Si]=O.O=[Al]O[Al]=O YGANSGVIUGARFR-UHFFFAOYSA-N 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- HDERJYVLTPVNRI-UHFFFAOYSA-N ethene;ethenyl acetate Chemical compound C=C.CC(=O)OC=C HDERJYVLTPVNRI-UHFFFAOYSA-N 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000011900 installation process Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 229910052627 muscovite Inorganic materials 0.000 description 1
- 239000002105 nanoparticle Substances 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 239000003566 sealing material Substances 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000008961 swelling Effects 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Landscapes
- Sealing Material Composition (AREA)
Abstract
The application relates to the technical field of silicone sealant, and discloses silicone sealant for a glass curtain wall and a preparation method thereof. The silicone sealant for the glass curtain wall comprises the following raw materials in parts by weight: 70-120 parts of polyether modified heptamethyltrisiloxane, 20-60 parts of a graft copolymer of butyl acrylate and EVA, 20-50 parts of a filler, 0.03-3 parts of a catalyst, 8-20 parts of a cross-linking agent and 1-4 parts of an antioxidant; wherein the filler is an inorganic filler and an organic filler, and the weight ratio of the inorganic filler to the organic filler is 1:0.3-0.8. The silicone sealant for the glass curtain wall, which is prepared from the raw materials with specific proportions and specific components, has excellent comprehensive performance, good bonding performance and no foaming after high-temperature curing.
Description
Technical Field
The application relates to the technical field of silicone sealant, in particular to silicone sealant for a glass curtain wall and a preparation method thereof.
Background
The glass curtain wall is a building outer envelope or decoration structure, which is composed of a supporting structure system which has a certain displacement capacity relative to a main body structure and does not share the action of the main body structure. The glass curtain wall is generally formed by adopting glass ribs or point supporting devices and supporting structures, has the advantages of light weight, strong decoration, convenient installation and construction and the like, is an obvious characteristic of modern high-rise buildings, has transparent appearance, and can lead the indoor space to be naturally harmonious with the outdoor environment.
The silicone sealant is a building sealing material and has the capability of bearing certain pressure and the weather resistance of bearing sunlight, temperature, wind, rain and other weather conditions. The molecular structure of the silicone sealant contains Si-O bonds, the bond energy of the Si-O bonds is up to 425kJ/mol, and the Si-O bonds are far larger than the C-C bond energy (345 kJ/mol) and the C-O bond energy (351 kJ/mol), so that the silicone sealant has good stability and stronger mechanical property; in addition, the polysiloxane has large molecular volume and low cohesive energy density, so that the polysiloxane has excellent stain resistance, high and low temperature resistance, high hydrophobicity, good air permeability and the like, can be used for a long time within the range of-60 to 200 ℃, and has small change of mechanical properties such as tensile strength, elongation, hardness and the like. Currently, silicone sealants have been used in amounts of more than 65% of the total amount consumed by the sealant system for construction applications.
However, the existing glass is stained with dust and greasy dirt in the installation process, and sealing glue and glass are not stained due to the fact that glue joints are not cleaned before glue injection; and when the adhesive is applied in hot days (outdoor temperature is more than 35 ℃), the adhesive is not compact, the surface drying speed of the sealant is too high in the curing process under the conditions that the diameter of a foam rod is not matched with the adhesive joint or the foam rod is damaged, and the air with too high temperature between the foam rods causes the swelling and the bubble phenomenon of the sealant, so that the mechanical property of the sealant is affected.
Therefore, development of a sealant excellent in adhesive property and free from foaming after curing at high temperature is urgently required.
Disclosure of Invention
In order to solve at least one technical problem, a sealant which is excellent in adhesive property and does not foam after high-temperature curing is developed, and the application provides a silicone sealant for a glass curtain wall and a preparation method of the silicone sealant.
On one hand, the application provides a silicone sealant for glass curtain wall, which comprises the following raw materials in parts by weight: 70-120 parts of polyether modified heptamethyltrisiloxane, 20-60 parts of a graft copolymer of butyl acrylate and EVA, 20-50 parts of a filler, 0.03-3 parts of a catalyst, 8-20 parts of a cross-linking agent and 1-4 parts of an antioxidant;
wherein the filler is an inorganic filler and an organic filler, and the weight ratio of the inorganic filler to the organic filler is 1:0.3-0.8.
By adopting the technical scheme, the silicone sealant for the glass curtain wall, which is prepared from the raw materials with specific proportions and specific components, has excellent comprehensive performance, good bonding performance and no foaming after high-temperature curing;
the application adopts the specific polyether modified heptamethyltrisiloxane as the basic polymer, and the ether bond in the molecular structure can form a hydrogen bond on the surface of the substrate, so that the adhesion to the substrate is improved, and meanwhile, the prepared sealant has flexibility and weather resistance, so that the prepared sealant still keeps stable adhesion performance in different environments; meanwhile, the silicon-oxygen bond in the polyether modified heptamethyltrisiloxane is easy to carry out a crosslinking reaction at high temperature, so that the sealant can quickly form a three-dimensional network structure in the curing process, and the sealant has lower surface tension, thereby being beneficial to uniformly dispersing the filler in the sealant and further reducing the formation of bubbles; the good fluidity is beneficial to forming a smooth and flat surface in construction application, and the generation of defects is reduced;
the specific graft copolymer of butyl acrylate and EVA has lower surface tension, so that the filler is uniformly dispersed in the sealant, and the possibility of bubble formation is further reduced; the high-temperature curing process has good fluidity, and is beneficial to eliminating bubbles; meanwhile, the adhesive has good adhesive property, can form good adhesive effect with the surfaces of various base materials, and can adapt to deformation and stress variation under various environmental conditions due to good cohesive force and flexibility, so that stable adhesive property is maintained; the high-temperature-resistant sealant has good stability at high temperature, can keep physical and chemical properties at higher temperature, and after high-temperature curing, the graft copolymer can form a compact network structure, so that the weather resistance and mechanical properties of the sealant are improved; the organic filler and the inorganic filler are compounded, so that good comprehensive performance can be obtained; the inorganic filler has better adhesive property and is beneficial to reducing the formation of bubbles.
Optionally, 90-100 parts of polyether modified heptamethyltrisiloxane and 40-50 parts of a graft copolymer of butyl acrylate and EVA.
By adopting the technical scheme, the silicone sealant prepared from the graft copolymer of the polyether modified heptamethyltrisiloxane and the butyl acrylate and EVA with a better range has better comprehensive performance.
Optionally, the inorganic filler is selected from one or two of wollastonite and mica.
Optionally, the inorganic filler is wollastonite and mica, and the weight ratio of the wollastonite to the mica is 1:0.5-1.
By adopting the technical scheme, wollastonite and mica are selected as the inorganic filler, so that more excellent comprehensive performance can be obtained, and the weather resistance, mechanical property and adhesive property of the sealant are improved;
wollastonite and mica with specific proportions are adopted as the composite inorganic filler, so that the production of bubbles after high-temperature curing is reduced, and the adhesive property of the sealant is improved.
Optionally, the wollastonite has an average particle size of 0.2 to 8 μm and the mica has an average particle size of 200 to 500nm.
Through adopting above-mentioned technical scheme, this application adopts wollastonite and mica of better average particle diameter, can further optimize the performance of sealant, improves its bonding property and bubble control effect after the high temperature solidification, and wollastonite's tiny particle diameter helps increasing its specific surface area, improves the area of contact with the base member, and then improves bonding property, and mica's nanometer particle diameter can make its better dispersion in the base member, reduces the agglomeration phenomenon between the filler, improves the wholeness ability.
Optionally, the inorganic filler is a modified inorganic filler, and the raw materials of the modified inorganic filler comprise a beta-cyclodextrin-polyethylene glycol copolymer and an inorganic filler, wherein the dosage of the beta-cyclodextrin-polyethylene glycol copolymer is 20-50wt% of that of the inorganic filler.
By adopting the technical scheme, the dispersibility and compatibility of the inorganic filler in the sealant are improved by adopting the modified inorganic filler and the proper beta-cyclodextrin-polyethylene glycol copolymer, the reactivity of the inorganic filler is improved, and the bonding performance of the sealant and the bubble control effect after high-temperature curing are further improved.
Optionally, the organic filler is a polyamide resin.
Optionally, the catalyst is n-butyl titanate, the cross-linking agent is propyl triacetoxy silane, and the antioxidant is antioxidant 1010.
On the other hand, the application provides a preparation method of silicone sealant for glass curtain walls, which comprises the following steps:
s1, mixing and stirring inorganic filler and organic filler to prepare filler;
s2, mixing and stirring the polyether modified heptamethyltrisiloxane, the grafted copolymer of butyl acrylate and EVA, adding a mixed filler, heating to 100-150 ℃, mixing and stirring for 0.5-1.2h, and adding a catalyst, a cross-linking agent and an antioxidant, mixing and stirring for 1-1.5h to obtain the silicone sealant for the glass curtain wall.
Through adopting above-mentioned technical scheme, the preparation method of the silicone sealant for glass curtain wall of this application, easy and simple to handle, but industrial production, and green, the silicone sealant for glass curtain wall of preparation has excellent adhesive property and stable performance under high temperature environment and does not bubble.
Optionally, in the step S2, the preparation method of the graft copolymer of butyl acrylate and EVA includes the following steps: adding butyl acrylate, ethylene-vinyl acetate and benzoyl peroxide in the weight ratio of 1:0.3-0.6:0.01-0.05 into a reactor, mixing and stirring for 2-5h, filtering and drying to obtain the graft copolymer of butyl acrylate and EVA.
By adopting the technical scheme, the graft copolymer of butyl acrylate and EVA prepared by the method has excellent adhesive property and flowability.
In summary, the present invention includes at least one of the following beneficial technical effects:
1. the silicone sealant for the glass curtain wall, which is prepared from the raw materials with specific components, has excellent comprehensive performance, good adhesive property and no foaming after high-temperature curing;
2. the application adopts the specific polyether modified heptamethyltrisiloxane as the basic polymer, and the ether bond in the molecular structure can form a hydrogen bond on the surface of the substrate, so that the adhesion to the substrate is improved, and meanwhile, the prepared sealant has flexibility and weather resistance, so that the prepared sealant still keeps stable adhesion performance in different environments; meanwhile, the silicon-oxygen bond in the polyether modified heptamethyltrisiloxane is easy to carry out a crosslinking reaction at high temperature, so that the sealant can quickly form a three-dimensional network structure in the curing process, and the sealant has lower surface tension, thereby being beneficial to uniformly dispersing the filler in the sealant and further reducing the possibility of bubble formation; the good fluidity is beneficial to forming a smooth and flat surface in construction application, and the generation of defects is reduced; 3. the specific graft copolymer of butyl acrylate and EVA has lower surface tension, so that the filler is uniformly dispersed in the sealant, and the possibility of bubble formation is further reduced; the high-temperature curing agent has good fluidity in the high-temperature curing process, and is beneficial to eliminating bubbles; and has better adhesive property;
4. the organic filler and the inorganic filler are compounded, so that good comprehensive performance can be obtained;
5. the preparation method of the silicone sealant for the glass curtain wall is simple and convenient to operate, can be used for industrial production, and is environment-friendly.
Detailed Description
The present application is described in further detail below with reference to examples.
The application designs a silicone sealant for a glass curtain wall, which comprises the following raw materials in parts by weight: 70-120 parts of polyether modified heptamethyltrisiloxane, 20-60 parts of a graft copolymer of butyl acrylate and EVA, 20-50 parts of a filler, 0.03-3 parts of a catalyst, 8-20 parts of a cross-linking agent and 1-4 parts of an antioxidant;
wherein the filler is an inorganic filler and an organic filler, and the weight ratio of the inorganic filler to the organic filler is 1:0.3-0.8.
The application provides a preparation method of silicone sealant for a glass curtain wall, which comprises the following steps:
s1, mixing and stirring inorganic filler and organic filler to prepare filler;
s2, mixing and stirring the polyether modified heptamethyltrisiloxane, the grafted copolymer of butyl acrylate and EVA, adding a filler, heating to 100-150 ℃, mixing and stirring for 0.5-1.2h, and adding a catalyst, a cross-linking agent and an antioxidant, mixing and stirring for 1-1.5h to obtain the silicone sealant for the glass curtain wall.
The preparation method of the beta-cyclodextrin-polyethylene glycol copolymer comprises the following steps: adding beta-cyclodextrin and polyethylene glycol into ethanol, stirring uniformly, and evaporating the solvent to obtain the beta-cyclodextrin-polyethylene glycol copolymer, wherein the weight ratio of the beta-cyclodextrin to the polyethylene glycol to the ethanol is 1:0.6:1.5.
DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION
The raw materials are as follows, and all raw materials are commercially available unless specified otherwise:
polyether modified heptamethyltrisiloxane: CAS number, 27306-78-1, brand, wande, purity 99%;
butyl acrylate: CAS number, 141-32-2;
ethylene vinyl acetate: CAS number, 24937-78-8, brand, euphoria, purity 99%;
benzoyl peroxide: CAS number, 94-36-0;
n-butyl titanate: CAS number, 5593-70-4;
propyl triacetoxy silane: CAS number, 17865-07-5;
polyamide resin: CAS number, 68410-23-1;
beta-cyclodextrin: CAS number, 68168-23-0;
polyethylene glycol: CAS number, 25322-68-3;
wollastonite: ball milling wollastonite with purity of 49% selected from Jiang Xiao superfine powder Co., ltd.) to obtain wollastonite mica with average particle size of 0.2-8 μm: selected from muscovite with 99% purity.
The detection item and the detection method are as follows:
tensile bond strength (MPa): indexes of the prepared silicone sealant are detected according to the standard of GB16776-2005 silicone structural sealant for construction;
the simulated curtain wall construction test method comprises the following steps: using 400mm multiplied by 400mm glass, reserving 18mm glue joints between 2 pieces of glass, manufacturing a curtain wall construction test plate in this way, placing the test plate in a 40 ℃ oven for 4 hours, taking out, immediately beating glue in the reserved glue joints according to a sealant construction method, immediately placing the glue joints in the 40 ℃ oven for curing after beating glue, and observing the foaming condition of the adhesive tape after curing for 8 hours.
Examples 1 to 5
Examples 1-5 specific raw material amounts of a silicone sealant for glass curtain wall are shown in table 1.
TABLE 1
Wherein the organic filler is polyamide resin, the inorganic filler is wollastonite, the average grain diameter is 0.2 mu m, the catalyst is n-butyl titanate, the cross-linking agent is propyl triacetoxy silane, and the antioxidant is antioxidant 1010.
Example 1
A preparation method of silicone sealant for glass curtain walls comprises the following steps:
s1, mixing and stirring inorganic filler and organic filler in a weight ratio of 1:0.3 to prepare filler;
s2, mixing and stirring polyether modified heptamethyltrisiloxane, a graft copolymer of butyl acrylate and EVA, adding a filler, heating to 100 ℃, mixing and stirring for 0.5h, and adding a catalyst, a cross-linking agent and an antioxidant, mixing and stirring for 1h to obtain the silicone sealant for the glass curtain wall;
in the step S2, the preparation method of the graft copolymer of butyl acrylate and EVA comprises the following steps: adding butyl acrylate, ethylene-vinyl acetate and benzoyl peroxide in a weight ratio of 1:0.3:0.01 into a reactor, mixing and stirring for 2 hours, and filtering and drying to obtain the graft copolymer of butyl acrylate and EVA.
Example 2
A preparation method of silicone sealant for glass curtain walls comprises the following steps:
s1, mixing and stirring inorganic filler and organic filler in a weight ratio of 1:0.5 to prepare filler;
s2, mixing and stirring polyether modified heptamethyltrisiloxane, a graft copolymer of butyl acrylate and EVA, adding a filler, heating to 130 ℃, mixing and stirring for 1h, and adding a catalyst, a cross-linking agent and an antioxidant, mixing and stirring for 1.2h to obtain the silicone sealant for the glass curtain wall;
in the step S2, the preparation method of the graft copolymer of butyl acrylate and EVA comprises the following steps: adding butyl acrylate, ethylene-vinyl acetate and benzoyl peroxide in a weight ratio of 1:0.5:0.03 into a reactor, mixing and stirring for 3 hours, and filtering and drying to obtain the graft copolymer of butyl acrylate and EVA.
Example 3
A preparation method of silicone sealant for glass curtain walls comprises the following steps:
s1, mixing and stirring inorganic filler and organic filler in a weight ratio of 1:0.8 to prepare filler;
s2, mixing and stirring polyether modified heptamethyltrisiloxane, butyl acrylate and EVA grafted copolymer, adding filler, heating to 150 ℃, mixing and stirring for 1.2 hours, adding catalyst, cross-linking agent and antioxidant, mixing and stirring for 1.5 hours, and obtaining the silicone sealant for the glass curtain wall;
in the step S2, the preparation method of the graft copolymer of butyl acrylate and EVA comprises the following steps: adding butyl acrylate, ethylene-vinyl acetate and benzoyl peroxide in a weight ratio of 1:0.6:0.05 into a reactor, mixing and stirring for 5 hours, and filtering and drying to obtain the graft copolymer of butyl acrylate and EVA.
Examples 4 to 5
A method for preparing silicone sealant for glass curtain wall was consistent with example 2.
Comparative example 1
The procedure of example 2 was followed, except that the organic filler was replaced by an equivalent amount of inorganic filler.
Comparative example 2
The procedure of example 2 was followed except that the inorganic filler was replaced by an equivalent amount of organic filler.
Comparative example 3
The procedure of example 2 was followed except that the graft copolymer of butyl acrylate and EVA was replaced with an equivalent amount of polyether modified heptamethyltrisiloxane.
The silicone sealants prepared in examples 1 to 5 and comparative examples 1 to 3 were subjected to performance test, and the test results are shown in Table 2.
TABLE 2
As can be seen from examples 1 to 3, comparative examples 1 to 3 and table 2, the silicone sealant for glass curtain wall prepared by adopting the raw materials with specific proportion and specific composition has excellent comprehensive performance, good adhesive property and no foaming after high-temperature curing;
from examples 4-5, 2 and Table 2, the silicone sealant prepared from the graft copolymer of polyether modified heptamethyltrisiloxane and butyl acrylate with EVA selected in the preferred range has more excellent comprehensive properties;
as can be seen from comparative examples 1-2, example 2 and table 2, the present application adopts organic filler and inorganic filler for compounding, and can obtain better comprehensive properties; the inventor speculates that the inorganic filler has better adhesive property, can improve the adhesive force of the sealant to the base material, and the organic filler can increase the flexibility and cohesive force of the sealant, and improve the adaptability and crack resistance of the sealant; meanwhile, the surface energy of the inorganic filler is lower, so that the surface tension of the sealant is reduced, the generation of bubbles is reduced, the fluidity of the organic filler is better, the uniform flow of the sealant in the curing process is facilitated, and the formation of the bubbles is further reduced;
as can be seen from comparative example 3, example 2 and table 2, the graft copolymer of butyl acrylate and EVA has lower surface tension, which is beneficial to uniform dispersion of filler in sealant, further reducing the possibility of bubble formation; the adhesive has good fluidity in the high-temperature curing process, is beneficial to eliminating bubbles, and has good adhesive property.
Example 6
The procedure of example 4 was followed except that equal amounts of mica, having an average particle size of 200nm, were used instead of wollastonite.
Examples 7 to 9
The procedure of example 4 was followed except that the inorganic filler was wollastonite and mica, the total weight of the inorganic filler was not changed, and the components and the preparation method were the same as those of example 4, wherein the wollastonite had an average particle diameter of 0.2. Mu.m, and the mica had an average particle diameter of 200nm.
Example 7
The weight ratio of wollastonite to mica is 1:0.5.
Example 8
The weight ratio of wollastonite to mica is 1:0.7.
Example 9
The weight ratio of wollastonite to mica is 1:1.
Examples 10 to 11
The procedure of example 8 was followed except that the average particle size of wollastonite and mica were different.
Example 10
The average particle size of wollastonite was 5. Mu.m, and the average particle size of mica was 350nm.
Example 11
The average particle size of wollastonite was 8. Mu.m, and the average particle size of mica was 500nm.
The silicone sealants prepared in examples 6 to 11 were subjected to performance test, and the test results are shown in Table 3.
TABLE 3 Table 3
As can be seen from examples 4, 6-9 and table 3, the inorganic filler in the application is compounded by wollastonite and mica, which is beneficial to reducing the generation of bubbles after high-temperature curing and improving the adhesive property of the sealant; the inventor speculates that wollastonite has lower surface energy, and can reduce the surface tension of the sealant, thereby reducing the generation of bubbles; the mica has better fluidity, is favorable for promoting the uniform flow of the sealant in the curing process, and can form a compact network structure by the mixed filler of wollastonite and mica in the high-temperature curing process, thereby reducing the formation and diffusion of bubbles.
As can be seen from examples 10-11, 8 and Table 3, the application adopts wollastonite and mica with better average particle size, so that the performance of the sealant can be further optimized, the bonding performance and the bubble control effect after high-temperature curing can be improved, the small particle size of the wollastonite is beneficial to increasing the specific surface area, increasing the contact area with a matrix, further improving the bonding performance, the nano particle size of the mica can enable the mica to be better dispersed in the matrix, the agglomeration phenomenon among fillers can be reduced, and the overall performance can be improved.
Examples 12 to 14
Based on example 10, the components and preparation methods are the same as those of example 10 except that the inorganic filler is a modified inorganic filler, wherein the raw materials of the modified inorganic filler comprise beta-cyclodextrin-polyethylene glycol copolymer and inorganic filler, and the preparation method of the modified inorganic filler comprises the following steps: mixing and stirring the beta-cyclodextrin-polyethylene glycol copolymer and the inorganic filler at the temperature of 75 ℃ for 80min, cooling to room temperature, and washing and drying the product to obtain the modified inorganic filler.
Example 12
The amount of beta-cyclodextrin-polyethylene glycol copolymer was 20wt% of the amount of inorganic filler.
Example 13
The amount of beta-cyclodextrin-polyethylene glycol copolymer was 35wt% of the amount of inorganic filler.
Example 14
The amount of beta-cyclodextrin-polyethylene glycol copolymer was 50wt% of the amount of inorganic filler.
The silicone sealants prepared in examples 12 to 14 were subjected to performance test, and the test results are shown in Table 4.
TABLE 4 Table 4
As can be seen from examples 12-14 and Table 4, the modified inorganic filler is selected in the application, so that the dispersibility and compatibility of the inorganic filler in the sealant are improved, the reactivity of the inorganic filler is improved, and the adhesive property of the sealant is further improved.
The foregoing are all preferred embodiments of the present application, and are not intended to limit the scope of the present application in any way, therefore: all equivalent changes according to the principles of this application should be covered by the protection scope of this application.
Claims (10)
1. The silicone sealant for the glass curtain wall is characterized by comprising the following raw materials in parts by weight: 70-120 parts of polyether modified heptamethyltrisiloxane, 20-60 parts of a graft copolymer of butyl acrylate and EVA, 20-50 parts of a filler, 0.03-3 parts of a catalyst, 8-20 parts of a cross-linking agent and 1-4 parts of an antioxidant;
wherein the filler is an inorganic filler and an organic filler, and the weight ratio of the inorganic filler to the organic filler is 1:0.3-0.8.
2. The silicone sealant for glass curtain wall according to claim 1, wherein the polyether modified heptamethyltrisiloxane is 90-100 parts and the graft copolymer of butyl acrylate and EVA is 40-50 parts.
3. The silicone sealant for glass curtain wall according to claim 1, wherein the inorganic filler is one or both of wollastonite and mica.
4. The silicone sealant for glass curtain walls according to claim 1, wherein the inorganic filler is wollastonite and mica, and the weight ratio of the wollastonite to the mica is 1:0.5-1.
5. A silicone sealant for glass curtain wall according to claim 3, wherein the wollastonite has an average particle size of 0.2 to 8 μm and the mica has an average particle size of 200 to 500nm.
6. The silicone sealant for glass curtain wall according to claim 1, wherein the inorganic filler is a modified inorganic filler, and the raw materials of the modified inorganic filler comprise a beta-cyclodextrin-polyethylene glycol copolymer and the inorganic filler, and the dosage of the beta-cyclodextrin-polyethylene glycol copolymer is 20-50wt% of the dosage of the inorganic filler.
7. The silicone sealant for glass curtain wall according to claim 1, wherein the organic filler is a polyamide resin.
8. The silicone sealant for glass curtain walls according to claim 1, wherein the catalyst is n-butyl titanate, the crosslinking agent is propyl triacetoxy silane, and the antioxidant is antioxidant 1010.
9. A method for preparing the silicone sealant for glass curtain wall according to any one of claims 1 to 8, comprising the steps of:
s1, mixing and stirring inorganic filler and organic filler to prepare filler;
s2, mixing and stirring the polyether modified heptamethyltrisiloxane, the butyl acrylate and the graft copolymer of EVA, adding the filler, heating to 100-150 ℃, mixing and stirring for 0.5-1.2h, and adding the catalyst, the cross-linking agent and the antioxidant, mixing and stirring for 1-1.5h to obtain the silicone sealant for the glass curtain wall.
10. The method for preparing silicone sealant for glass curtain wall according to claim 9, wherein in S2, the method for preparing the graft copolymer of butyl acrylate and EVA comprises the following steps: adding butyl acrylate, ethylene-vinyl acetate and benzoyl peroxide in the weight ratio of 1:0.3-0.6:0.01-0.05 into a reactor, mixing and stirring for 2-5h, filtering and drying to obtain the graft copolymer of butyl acrylate and EVA.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202311769770.8A CN117801753A (en) | 2023-12-21 | 2023-12-21 | Silicone sealant for glass curtain wall and preparation method thereof |
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| CN202311769770.8A CN117801753A (en) | 2023-12-21 | 2023-12-21 | Silicone sealant for glass curtain wall and preparation method thereof |
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