CN113845868B - Modified organosilicon sealant and application thereof - Google Patents
Modified organosilicon sealant and application thereof Download PDFInfo
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- CN113845868B CN113845868B CN202111141236.3A CN202111141236A CN113845868B CN 113845868 B CN113845868 B CN 113845868B CN 202111141236 A CN202111141236 A CN 202111141236A CN 113845868 B CN113845868 B CN 113845868B
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J171/00—Adhesives based on polyethers obtained by reactions forming an ether link in the main chain; Adhesives based on derivatives of such polymers
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
- C09J11/02—Non-macromolecular additives
- C09J11/04—Non-macromolecular additives inorganic
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
- C09J11/02—Non-macromolecular additives
- C09J11/06—Non-macromolecular additives organic
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- Organic Chemistry (AREA)
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- Chemical Kinetics & Catalysis (AREA)
- Sealing Material Composition (AREA)
Abstract
The invention discloses a modified organosilicon sealant and a preparation method and application thereof, belonging to the technical field of sealing materials. The sealant comprises the following components in parts by weight: 50-100 parts of acrylic acid modified end silicon alkoxy polyether, 10-50 parts of plasticizer, 2-10 parts of thixotropic agent, 20-200 parts of filler, 0.5-3 parts of water removing agent, 1-4 parts of adhesion promoter and 0.1-0.5 part of catalyst. The modified organosilicon sealant can be used as a sealant for attaching a touch screen and a frame shell, replaces the traditional double-sided adhesive for attaching the touch screen, has excellent sealing property and high initial adhesion, can improve the attaching precision and the production efficiency, and realizes the automation and the mechanization of a production line.
Description
Technical Field
The invention relates to a modified organosilicon sealant and application thereof, belonging to the technical field of sealing materials.
Background
With the rapid development of the electronic communication industry technology, touch screens are more and more popular with consumers due to attractive appearance, convenience in operation, visualization and intellectualization. In the traditional manufacturing process of the touch screen, a double-sided adhesive tape is used for pressing and attaching to a frame shell of a mobile phone (or a flat panel and other equipment), the existing pressing and attaching production process needs manual film tearing of the double-sided adhesive tape, the double-sided adhesive tape is placed in a positioning groove consistent with the appearance of the mobile phone, then the touch screen and the frame shell are attached together, and pressing and fixing treatment is carried out.
The traditional touch screen laminating process has more manual demands, lower efficiency and larger manual operation error, is difficult to realize automation and mechanization, and needs to find a solution to effectively improve the production efficiency. The conventional organosilicon sealant contains higher content of low molecules (D3-D10), and is easy to cause pollution and failure when applied to optical elements such as touch screens and the like in the later period of low molecule volatilization. The common silane-terminated alkoxy polyether has low initial adhesion and low production efficiency.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, provides the modified organic silicon sealant with good bonding performance, effectively replaces double-sided adhesive to firmly attach the touch screen and the frame shell, can realize automatic and mechanical dispensing and pressurization, and greatly improves the production efficiency.
In order to achieve the purpose, the invention adopts the technical scheme that: the modified organosilicon sealant comprises the following components in parts by weight: 50-100 parts of acrylic acid modified end silicon alkoxy polyether, 10-50 parts of plasticizer, 2-10 parts of thixotropic agent, 20-200 parts of filler, 0.5-3 parts of water removing agent, 1-4 parts of adhesion promoter and 0.1-0.5 part of catalyst.
According to the invention, the acrylic acid modified silane-terminated polyether is used as a base polymer, and a plasticizer, a thixotropic agent, a filler, a water removal agent, an adhesion promoter and a catalyst are added, so that the prepared modified organosilicon sealant has the advantages of good mechanical property, high strength, large initial adhesion and good thixotropy, and is suitable for the lamination of a touch screen.
As a preferred embodiment of the modified organosilicon sealant, the viscosity of the acrylic modified silane-terminated polyether is 10000cPs-100000cPs.
The viscosity of the acrylic acid modified silane-terminated polyether affects the bonding performance and tensile strength of the sealant, and if the viscosity is too low, the mechanical strength is poor, and if the viscosity is too high, the viscosity of the rubber material is high, and the production and processing difficulty is high. More preferably, the acrylic modified silane-terminated polyether has higher polarity, higher tensile strength and better adhesion performance compared with the common silane-terminated polyether.
In a preferred embodiment of the modified silicone sealant of the present invention, the plasticizer is at least one of aliphatic dibasic acid esters, phthalic acid esters, benzenepolycarboxylic acid esters, benzoic acid esters, polyol esters, chlorinated hydrocarbons, epoxies, citric acid esters, and polyesters.
The main function of the plasticizer is to weaken van der waals force between polymer molecules, thereby increasing mobility of polymer molecular chains and reducing crystallization of polymer molecular chains. The plasticizer is added into the sealant, so that the effects of increasing the fluidity and reducing the hardness can be achieved, but the excessive plasticizer not only easily causes the migration and the exudation of the plasticizer, but also influences the sagging property and the mechanical property of the sealant. The plasticizer adopted by the invention has high compatibility, high plasticizing efficiency and good adaptability.
As a preferred embodiment of the modified silicone sealant of the present invention, the thixotropic agent is at least one of fumed silica, precipitated silica, montmorillonite, hydrogenated castor oil, polyamide wax and carbon black.
Preferably, the thixotropic agent is fumed silica, the thixotropic efficiency of the fumed silica is high, and higher thixotropy can be achieved by adding a small amount of the fumed silica.
As a preferable embodiment of the modified silicone sealant of the invention, the filler is at least one of nano calcium carbonate, light calcium carbonate, heavy calcium carbonate, silicon micropowder, talcum powder, mica powder, kaolin, alumina, magnesium oxide, zinc oxide, ferric oxide and titanium dioxide.
Preferably, the filler is nano calcium carbonate, the nano calcium carbonate has an obvious reinforcing effect, and the colloid strength of the sealant can be effectively improved.
As a preferred embodiment of the modified organosilicon sealant, the water scavenger is a vinyl silane coupling agent.
Preferably, the water removal agent is vinyl trimethoxy silane, the water removal efficiency of the vinyl trimethoxy silane is high, and the storage life of the sealant can be effectively prolonged.
In a preferred embodiment of the modified silicone sealant of the present invention, the adhesion promoter is at least one of allylalkoxysilane, acryloxypropylalkoxysilane, aminohydrocarbylalkoxysilane, epoxyhydrocarbylalkoxysilane, mercaptohydrocarbylalkoxysilane.
Preferably, the adhesion promoter is N-beta- (aminoethyl) -gamma-aminopropyltrimethoxysilane or gamma-aminopropyltriethoxysilane, and the two adhesion promoters have excellent adhesion performance to various substrates.
As a preferred embodiment of the modified silicone sealant, the catalyst is an organotin catalyst, and the organotin catalyst is one of stannous octoate, dibutyltin diacetate and dioctyltin dilaurate.
Preferably, the organotin catalyst is dibutyltin dilaurate.
On the other hand, the invention provides application of the organic modified sealant in touch screen attachment.
Compared with the prior art, the invention has the beneficial effects that: the modified organosilicon sealant provided by the invention has excellent adhesion to touch screens and mobile phone shells, good sealing performance and good extrudability, is suitable for automatic and mechanized dispensing production processes, and can greatly improve the production efficiency of factories.
Detailed Description
To better illustrate the objects, aspects and advantages of the present invention, the present invention will be further described with reference to specific examples.
Example 1
The embodiment provides a modified organosilicon sealant for attaching a touch screen, which comprises the following components in parts by weight: 60 parts of acrylic acid modified terminal siloxy polyether, 40 parts of plasticizer, 10 parts of thixotropic agent, 150 parts of filler, 1 part of water removing agent, 1 part of adhesion promoter and 0.4 part of catalyst.
In this embodiment, the viscosity of the acrylic modified epoxy terminated polyether is 10000cPs; the plasticizer is epoxidized soybean oil; the thixotropic agent is montmorillonite; the filler is light calcium carbonate; the water removing agent is vinyl triethoxysilane; the adhesion promoter is gamma- (2, 3-epoxypropoxy) propyl trimethoxy silane; the catalyst is stannous octoate.
Example 2
The embodiment provides a modified organosilicon sealant for attaching a touch screen, which comprises the following components in parts by weight: 60 parts of acrylic acid modified terminal siloxy polyether, 40 parts of plasticizer, 8 parts of thixotropic agent, 180 parts of filler, 2 parts of water removing agent, 2 parts of adhesion promoter and 0.4 part of catalyst.
In this embodiment, the viscosity of the acrylic modified terminal siloxy polyether is 20000cPs; the plasticizer is tributyl citrate; the thixotropic agent is polyamide wax; the filler is silicon micropowder; the water removing agent is vinyl triethoxysilane; the adhesion promoter is gamma-methacryloxypropyltrimethoxysilane; the catalyst is dioctyltin dilaurate.
Example 3
The embodiment provides a modified organosilicon sealant for attaching a touch screen, which comprises the following components in parts by weight: 60 parts of acrylic acid modified terminal siloxy polyether, 40 parts of plasticizer, 8 parts of thixotropic agent, 180 parts of filler, 2 parts of water removing agent, 2 parts of adhesion promoter and 0.4 part of catalyst.
In this embodiment, the viscosity of the acrylic modified terminal siloxy polyether is 20000cPs; the plasticizer is tributyl citrate; the thixotropic agent is polyamide wax; the filler is silicon micropowder; the water removing agent is vinyl triethoxysilane; the adhesion promoter is gamma-aminopropyl triethoxysilane; the catalyst is dioctyltin dilaurate.
Example 4
The embodiment provides a modified organosilicon sealant for attaching a touch screen, which comprises the following components in parts by weight: 60 parts of acrylic acid modified terminal siloxy polyether, 40 parts of plasticizer, 8 parts of thixotropic agent, 180 parts of filler, 2 parts of water removing agent, 2 parts of adhesion promoter and 0.4 part of catalyst.
In this embodiment, the viscosity of the acrylic modified terminal siloxy polyether is 20000cPs; the plasticizer is tributyl citrate; the thixotropic agent is polyamide wax; the filler is silicon micropowder; the water removing agent is vinyl triethoxysilane; the adhesion promoter is N-beta- (aminoethyl) -gamma-aminopropyltrimethoxysilane; the catalyst is dioctyltin dilaurate.
Example 5
The embodiment provides a modified organosilicon sealant for attaching a touch screen, which comprises the following components in parts by weight: 80 parts of acrylic acid modified terminal siloxy polyether, 20 parts of plasticizer, 5 parts of thixotropic agent, 100 parts of filler, 1 part of water removing agent, 3 parts of adhesion promoter and 0.3 part of catalyst.
In this example, the viscosity of the acrylic modified epoxy terminated polyether was 40000cPs; the plasticizer is dioctyl phthalate; the thixotropic agent is fumed silica, and the specific surface area is 200m < 2 >/g; the filler is nano calcium carbonate; the water removing agent is vinyl trimethoxy silane; the adhesion promoter is N-beta- (aminoethyl) -gamma-aminopropyltrimethoxysilane; the catalyst was dibutyltin dilaurate.
Example 6
The embodiment provides a modified organosilicon sealant for attaching a touch screen, which comprises the following components in parts by weight: 100 parts of acrylic acid modified terminal siloxy polyether, 50 parts of plasticizer, 10 parts of thixotropic agent, 200 parts of filler, 3 parts of water removing agent, 4 parts of adhesion promoter and 0.5 part of catalyst.
In this example, the viscosity of the acrylic modified epoxy terminated polyether was 40000cPs; the plasticizer is dioctyl phthalate; the thixotropic agent is fumed silica, and the specific surface area is 200m < 2 >/g; the filler is nano calcium carbonate; the water removing agent is vinyl trimethoxy silane; the adhesion promoter is N-beta- (aminoethyl) -gamma-aminopropyltrimethoxysilane; the catalyst was dibutyltin dilaurate.
Example 7
The embodiment provides a modified organosilicon sealant for attaching a touch screen, which comprises the following components in parts by weight: 50 parts of acrylic acid modified terminal siloxy polyether, 10 parts of plasticizer, 2 parts of thixotropic agent, 20 parts of filler, 0.5 part of water removing agent, 2 parts of adhesion promoter and 0.1 part of catalyst.
In this example, the viscosity of the acrylic modified epoxy terminated polyether was 40000cPs; the plasticizer is dioctyl phthalate; the thixotropic agent is fumed silica, and the specific surface area is 200m < 2 >/g; the filler is nano calcium carbonate; the water removing agent is vinyl trimethoxy silane; the adhesion promoter is N-beta- (aminoethyl) -gamma-aminopropyltrimethoxysilane; the catalyst was dibutyltin dilaurate.
Comparative example 1
The only difference between this example and example 1 is that the terminal siloxy polyether used was not acrylic modified.
Comparative example 2
The only difference between this comparative example and example 1 is that the acrylic modified siloxy terminated polyether has a viscosity of 3000cPs.
Comparative example 3
The only difference between this comparative example and example 1 is that the plasticizer was dimethicone having a viscosity of 100cPs.
Comparative example 4
The only difference between this comparative example and example 1 is that the catalyst is butyl titanate.
Effect example 1
The modified silicone sealants obtained in examples 1 to 6 were tested for tensile strength in accordance with GB/T528; hardness was measured according to GB/T531-1999, shear strength and initial adhesion were measured according to GB/T7124-08, tack free time was measured according to ASTM D2377. The performance indexes are shown in table 1.
TABLE 1
As can be seen from Table 1, the modified silicone sealant of the present invention has good adhesion properties.
Finally, it should be noted that the above embodiments are intended to illustrate the technical solutions of the present invention and not to limit the scope of the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention.
Claims (5)
1. The modified organosilicon sealant is characterized by comprising the following components in parts by weight: 50-100 parts of acrylic modified terminal siloxy polyether, 10-50 parts of plasticizer, 2-10 parts of thixotropic agent, 20-200 parts of filler, 0.5-3 parts of water-removing agent, 1-4 parts of adhesion promoter and 0.1-0.5 part of catalyst;
the viscosity of the acrylic acid modified terminal siloxy polyether is 10000cPs-40000cPs;
the plasticizer is at least one of epoxidized soybean oil, tributyl citrate and dioctyl phthalate;
the thixotropic agent is at least one of fumed silica, precipitated white carbon black, montmorillonite, hydrogenated castor oil, polyamide wax and carbon black;
the catalyst is an organic tin catalyst which is one of dialkyl tin dicarboxylate, dialkyl diaryloxy tin, dialkyl tin bis (beta-ketoester) and stannous dicarboxylate.
2. The modified silicone sealant according to claim 1, wherein the filler is at least one of nano calcium carbonate, light calcium carbonate, heavy calcium carbonate, silica micropowder, talc, mica powder, kaolin, alumina, magnesium oxide, zinc oxide, iron oxide, and titanium dioxide.
3. The modified silicone sealant of claim 1 wherein the water scavenger is a vinyl silane coupling agent.
4. The modified silicone sealant of claim 1 wherein the adhesion promoter is at least one of allylalkoxysilane, acryloxypropylalkoxysilane, aminohydrocarbylalkoxysilane, epoxyhydrocarbylalkoxysilane, mercaptohydrocarbylalkoxysilane.
5. The use of the modified silicone sealant of any one of claims 1-4 in touch screen applications.
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| CN202111141236.3A CN113845868B (en) | 2021-09-27 | 2021-09-27 | Modified organosilicon sealant and application thereof |
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| CN202111141236.3A CN113845868B (en) | 2021-09-27 | 2021-09-27 | Modified organosilicon sealant and application thereof |
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| CN113845868B true CN113845868B (en) | 2023-03-24 |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107033827A (en) * | 2017-03-28 | 2017-08-11 | 苏州正硅防水科技有限公司 | A kind of single component silane modified polyether seal glue for building and preparation method thereof |
| WO2021132523A1 (en) * | 2019-12-27 | 2021-07-01 | 東洋紡株式会社 | Moisture-curable adhesive composition |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109135650B (en) * | 2018-08-06 | 2021-01-29 | 广东睿住住工科技有限公司 | Single-component silane modified polyether sealant and preparation method thereof |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107033827A (en) * | 2017-03-28 | 2017-08-11 | 苏州正硅防水科技有限公司 | A kind of single component silane modified polyether seal glue for building and preparation method thereof |
| WO2021132523A1 (en) * | 2019-12-27 | 2021-07-01 | 東洋紡株式会社 | Moisture-curable adhesive composition |
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