CN116083047A - Sprayable high-adhesion room-temperature-curing liquid silicone rubber and preparation method and application thereof - Google Patents
Sprayable high-adhesion room-temperature-curing liquid silicone rubber and preparation method and application thereof Download PDFInfo
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- CN116083047A CN116083047A CN202211680344.2A CN202211680344A CN116083047A CN 116083047 A CN116083047 A CN 116083047A CN 202211680344 A CN202211680344 A CN 202211680344A CN 116083047 A CN116083047 A CN 116083047A
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Abstract
The invention discloses sprayable high-adhesion room-temperature-curing liquid silicone rubber, and a preparation method and application thereof, wherein the sprayable high-adhesion room-temperature-curing liquid silicone rubber comprises a component A containing basic silica gel and a catalyst, and a component B containing basic silica gel and a cross-linking agent: wherein the mass ratio of the component A to the component B is 1:1. compared with the prior art, the product of the invention has extremely low viscosity and can be applied by spraying; under the condition of existence of soldering tin, soldering flux and the like, the adhesive is quickly solidified at room temperature, and a workpiece can be carried 30min after the adhesive is applied.
Description
Technical Field
The invention relates to a high molecular material, and particularly discloses sprayable high-adhesion room-temperature-curing liquid silicone rubber, and a preparation method and application thereof.
Background
The general polymer material mostly takes carbon-carbon (C-C) bond as main chain structure, such as plastic, rubber, chemical fiber and the like, while the organic silicon product takes silicon-oxygen (Si-O) bond as main chain structure, the bond energy of the C-C bond is 82.6 kcal/gram molecule, and the bond energy of the Si-O bond is 121 kcal/gram molecule in the organic silicon, so the organic silicon product has high thermal stability, and the chemical bond of the molecule is not broken or decomposed at high temperature (or radiation irradiation). Meanwhile, as the molecules of the organic silicon are flexible spiral structures, the organic silicon can not only resist high temperature, but also resist low temperature, and can be used in a wide temperature range. Because of the particularity of the O-Si-O-main chain of the organosilicon product, the main chain has no double bonds, and is not easy to be decomposed by ultraviolet light and ozone. In organosilicon products, the chain length of Si-O bonds is about one and one half times the chain length of C-C bonds, and longer chain lengths enable the organosilicon to have better thermal stability and irradiation and weather resistance than other high molecular materials. The organosilicon products have good electrical insulation properties, dielectric loss, voltage resistance, arc resistance, corona resistance, volume resistivity, surface resistivity and the like are all named as festoons in the insulating material, and the electrical properties of the organosilicon products are little influenced by temperature and frequency. Therefore, they are stable electrical insulating materials and are widely used in the electronics and electrical industries. The silicone has excellent water repellency in addition to excellent heat resistance, which is a guarantee of high reliability in use of electrical equipment under wet conditions.
Since silicone has these excellent properties, its application range is very wide. The material is not only used as a special material for aviation, sophisticated technology and military technical departments, but also used for various departments of national economy, and the application range of the material is expanded to: building, electronics and electricity, textile, automotive, mechanical, leather papermaking, chemical light industry, metal and paint, medical and pharmaceutical, and the like.
In the electronic and electrical industry, due to the fact that individual novel electronic components are not resistant to high temperature and the national energy conservation and emission reduction requirements, more and more occasions need room-temperature cured organic silicon liquid rubber. The condensed room temperature curing silicone rubber cannot meet the special requirements of the electronic and electric industry due to odor, volume shrinkage and other reasons. Therefore, addition type room temperature curing liquid silicone rubber is the best choice. Spray sizing is widely used in the electronics and electrical industry for reasons of high efficiency, uniformity and strong controllability.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides sprayable high-adhesion room-temperature-curing liquid silicone rubber, and a preparation method and application thereof, so as to meet the application scenes of the special electronic and electric industries.
The aim of the invention can be achieved by the following technical scheme: the sprayable high-adhesion room-temperature-curing liquid silicone rubber is characterized by comprising an A component containing basic silica gel and a catalyst and a B component containing the basic silica gel and a cross-linking agent: wherein the mass ratio of the component A to the component B is 1:1.
the component A comprises the following components in parts by weight: 90-110 parts of one or more low volatility dimethylpolysiloxanes containing at least two vinyl groups per molecule; 0.1-8.5 parts of platinum catalyst; 1-15 parts of hydrophobic fumed silica; 0.05-2 parts of viscosity reducer; 0.5-3 parts of pigment.
The low volatility dimethylpolysiloxane containing two vinyl groups comprises a vinyl terminated polydimethylsiloxane. Preferably, the mass ratio of the vinyl-terminated polydimethylsiloxane having a viscosity of 1000 mPas to the vinyl-terminated polydimethylsiloxane having a viscosity of 500 mPas is 1.2 to 1.5: 1.
The component A is prepared by the following method: uniformly mixing low-volatility dimethylpolysiloxane containing two vinyl groups with a platinum catalyst, adding hydrophobic gas phase white carbon black, rapidly dispersing in a high-speed dispersing machine for 5-15min, adding a viscosity reducer and pigment, continuously dispersing at high speed for 5-15min, and then carrying out vacuum degassing to obtain the component A.
The component B comprises the following components in parts by weight: 90-100 parts of one or more low volatility dimethylpolysiloxanes containing at least two vinyl groups per molecule; 10-15 parts of one or more dimethylpolysiloxanes containing at least two or more Si-H groups per molecule; 1-15 parts of hydrophobic fumed silica; 0.05-2 parts of inhibitor.
The low volatility dimethylpolysiloxane containing two vinyl groups comprises a vinyl terminated polydimethylsiloxane. Preferably, the vinyl-terminated polydimethylsiloxane having a viscosity of 2000mPas and the vinyl-terminated polyvinyl polydimethylsiloxane having a viscosity of 500 mPas are present in a mass ratio of 1.1 to 1.2: 1.
The dimethyl polysiloxane containing two or more Si-H groups comprises one or two of trimethylsilyl-terminated hydrogen-containing polyorganosiloxane or silicon-hydrogen-terminated polydimethylsiloxane.
The component B is prepared by the following method: rapidly dispersing low-volatility dimethylpolysiloxane containing two vinyl groups and inhibitor in a high-speed dispersing machine for 5-15min, adding dimethylpolysiloxane containing two or more Si-H groups, hydrophobic vapor silicon dioxide and bonding aid, continuously dispersing at high speed for 5-15min, and vacuum degassing to obtain component B.
The preparation method of the sprayable high-adhesion room-temperature-curing liquid silicone rubber comprises the following steps of: 1 are mixed by a static mixer.
According to the application of the sprayable high-adhesion room-temperature-curing liquid silicone rubber, the component A and the component B are mixed and then are glued in a spraying mode, after glue is glued, surface drying and transportation can be realized within 30 minutes at the room temperature of 25+/-2 ℃, and good adhesion can be formed under the condition that soldering tin and auxiliary agents are present on the surface of the PCBA within 24 hours.
Compared with the prior art, the invention has the following beneficial effects:
1. the low-volatility dimethyl polysiloxane raw material is used, so that the safety and environmental protection are realized;
2. extremely low viscosity, spray sizing;
3. under the conditions of soldering tin, soldering flux and the like, the adhesive is quickly cured at room temperature, and a workpiece can be carried 30min after the adhesive is applied;
4. no release of small molecules, no smell and no volume shrinkage;
5. and reliable and firm bonding is formed at room temperature.
Detailed Description
The following describes in detail the examples of the present invention, which are implemented on the premise of the technical solution of the present invention, and detailed embodiments and specific operation procedures are given, but the scope of protection of the present invention is not limited to the following examples.
The starting materials used in the following examples are all commercially available, for example:
vinyl-terminated polydimethyl siloxane may be selected from the group consisting of the types of Anbi, inc. VS2000, VS1000, VS500, etc.;
vinyl-terminated polyvinyl polydimethylsiloxane can be selected from products of the model of VDM500 of Anbi company, and the like;
the trimethylsilyl-terminated hydrogen-containing polyorganosiloxane may be selected from the model of the company amba XL-1B;
the product of the model CE500, CE13 of Anbi company and the like can be selected as the hydrosilylation-terminated polydimethylsiloxane;
the platinum catalyst can be selected from the products of the model of Pt-1020 and the like of the Anbi company;
the hydrophobic vapor phase method silicon dioxide can be selected from products of model numbers 8200 of winning company;
the viscosity reducer can be selected from the product of winning company Glide series;
the pigment can be selected from vinyl silicone oil series products of the company of Gansheng;
the inhibitor can be 2827-186L product of Anbi company;
the bonding aid may be selected from the types of products of the Xinyue company KH560, KH5070, etc., including but not limited to the bonding aids mentioned above.
Example 1
52g of vinyl-terminated polydimethylsiloxane (VS 2000) having a viscosity of 2000mPas and 36g of vinyl-terminated polydimethylsiloxane (VS 1000) having a viscosity of 1000 mPas were weighed and 4.7g of platinum catalyst (Pt-1020) were stirred well; 5.3g of hydrophobic fumed silica (8200), rapidly dispersing for 10min in a high-speed dispersing machine, adding 1 part of viscosity reducer and 1 part of pigment, continuously dispersing for 10min at high speed, and then carrying out vacuum degassing to obtain a catalyst (A) component mixture for later use.
42g of vinyl-terminated polydimethylsiloxane (VS 2000) having a viscosity of 2000mPas and 36g of vinyl-terminated polyvinyl polydimethylsiloxane (VDM 500) having a viscosity of 500 mPas were weighed, 0.8g of inhibitor (2827-186L) was added, rapidly dispersed in a high-speed dispersing machine for 10min, 2g of trimethylsilyl-terminated hydrogen-containing polyorganosiloxane (XL-1B) and 10g of hydrosilylation-terminated polydimethylsiloxane (CE 500) and 5.2g of hydrophobic fumed silica (8200), 4.0g of gamma-glycidoxypropyl trimethoxysilane (KH 560) were added, and the high-speed dispersion was continued for 10min, followed by vacuum degassing to obtain a crosslinker (B) component mixture for use.
Equal amounts of the catalyst (A) and the cross-linking agent (B) are weighed (measured) according to a ratio of 1:1, and uniformly mixed, so that the spray high-adhesion room-temperature curing addition type liquid silicone rubber can be prepared.
Example 2
52g of vinyl-terminated polydimethylsiloxane (VS 2000) having a viscosity of 1000 mPas and 36g of vinyl-terminated polydimethylsiloxane (VS 1000) having a viscosity of 500 mPas were weighed and 4.7g of platinum catalyst (Pt-1020) were stirred well; 15.3g of hydrophobic vapor phase method silicon dioxide is rapidly dispersed in a high-speed dispersing machine for 10min, 1 part of viscosity reducer and 1 part of pigment are added, the high-speed dispersion is continued for 10min, and then the vacuum degassing is carried out, so that the catalyst (A) component mixture is obtained for standby.
42g of vinyl-terminated polydimethylsiloxane (VS 2000) having a viscosity of 1000 mPas and 33g of vinyl-terminated polyvinyl polydimethylsiloxane (VDM 500) having a viscosity of 500 mPas were weighed, 0.8g of inhibitor (2827-186L) was added, rapidly dispersed in a high-speed dispersing machine for 10min, 3g of trimethylsilyl-terminated hydrogen-containing polyorganosiloxane (XL-1B) and 12g of hydrosilylation-terminated polydimethylsiloxane (CE 500) and 15.2g of hydrophobic fumed silica, 4.0g of gamma-glycidylether oxypropyl trimethoxysilane were added, and high-speed dispersion was continued for 10min, followed by vacuum degassing to obtain a crosslinker (B) component mixture for use.
Equal amounts of the catalyst (A) and the cross-linking agent (B) are weighed (measured) according to a ratio of 1:1, and uniformly mixed, so that the spray high-adhesion room-temperature curing addition type liquid silicone rubber can be prepared.
Example 3
52g of vinyl-terminated polydimethylsiloxane (VS 2000) having a viscosity of 1000 mPas and 36g of vinyl-terminated polydimethylsiloxane (VS 1000) having a viscosity of 500 mPas were weighed and 4.7g of platinum catalyst (Pt-1020) were stirred well; 5.3g of hydrophobic vapor phase method silicon dioxide is rapidly dispersed in a high-speed dispersing machine for 10min, 1 part of viscosity reducer and 1 part of pigment are added, the high-speed dispersion is continued for 10min, and then the vacuum degassing is carried out, so that the catalyst (A) component mixture is obtained for standby.
42g of vinyl-terminated polydimethylsiloxane (VS 2000) having a viscosity of 1000 mPas and 33g of vinyl-terminated polyvinyl polydimethylsiloxane (VDM 500) having a viscosity of 500 mPas were weighed, 0.8g of inhibitor (2827-186L) was added, rapidly dispersed in a high-speed dispersing machine for 10min, 3g of trimethylsilyl-terminated hydrogen-containing polyorganosiloxane (XL-1B) and 12g of hydrosilylation-terminated polydimethylsiloxane (CE 500) and 5.2g of hydrophobic fumed silica, 4.0g of gamma-methacryloxypropyl trimethoxysilane were added, followed by high-speed dispersion for 10min and vacuum degassing to obtain a crosslinker (B) component mixture for use.
Equal amounts of the catalyst (A) and the cross-linking agent (B) are weighed (measured) according to a ratio of 1:1, and uniformly mixed, so that the spray high-adhesion room-temperature curing addition type liquid silicone rubber can be prepared.
The silicone rubber elastomers prepared in examples 1,2 and 3 were subjected to product performance test, and the results are shown in Table 1.
TABLE 1
From the table, the viscosity of the product obtained by the invention is less than 2000mPas, the process requirement of spray sizing can be met, the tensile strength after sizing is more than or equal to 0.4MPa, the tensile shear strength is more than or equal to 0.3MPa, and the performance requirement of the consumer electronic product in special application scenes can be met.
The product of the invention can be cured at room temperature without additional heating; the adhesive is firm to common engineering plastics such as metal, PC, ABS, PA and the like; the rubber is addition type silicon rubber, small molecules are not separated out, the volume is not contracted, and the rubber is environment-friendly; the product has a wide viscosity range, from hundreds of thousands to hundreds of mPas, and can achieve the above functions (high viscosity cannot ensure spraying).
Claims (10)
1. The sprayable high-adhesion room-temperature-curing liquid silicone rubber is characterized by comprising an A component containing basic silica gel and a catalyst and a B component containing the basic silica gel and a cross-linking agent: wherein the mass ratio of the component A to the component B is 1:1.
2. the sprayable high adhesion room temperature cure liquid silicone rubber of claim 1 wherein the a component comprises the following components in parts by weight: 90-110 parts of one or more low volatility dimethylpolysiloxanes containing at least two vinyl groups per molecule; 0.1-8.5 parts of platinum catalyst; 1-15 parts of hydrophobic fumed silica; 0.05-2 parts of viscosity reducer; 0.5-3 parts of pigment.
3. The sprayable, high adhesion room temperature cure liquid silicone rubber of claim 2 wherein said low volatility dimethylpolysiloxane containing two vinyl groups comprises a vinyl terminated polydimethylsiloxane.
4. The sprayable, high adhesion, room temperature cure liquid silicone rubber of claim 1 wherein the a component is prepared by: uniformly mixing low-volatility dimethylpolysiloxane containing two vinyl groups with a platinum catalyst, adding hydrophobic gas phase white carbon black, rapidly dispersing in a high-speed dispersing machine for 5-15min, adding a viscosity reducer and pigment, continuously dispersing at high speed for 5-15min, and then carrying out vacuum degassing to obtain the component A.
5. The sprayable high adhesion room temperature cure liquid silicone rubber of claim 1 wherein the B component comprises the following components in parts by weight: 90-100 parts of one or more low volatility dimethylpolysiloxanes containing at least two vinyl groups per molecule; 10-15 parts of one or more dimethylpolysiloxanes containing at least two or more Si-H groups per molecule; 1-15 parts of hydrophobic fumed silica; 0.05-2 parts of inhibitor.
6. The sprayable, high adhesion room temperature cure liquid silicone rubber of claim 1 wherein the low volatility dimethylpolysiloxane containing two vinyl groups comprises a vinyl terminated polydimethylsiloxane.
7. The sprayable, high adhesion room temperature curable liquid silicone rubber of claim 1 wherein said dimethylpolysiloxane containing two or more Si-H groups comprises one or both of trimethylsilyl-terminated hydrogen-containing polyorganosiloxane or hydrosilylation-terminated polydimethylsiloxane.
8. The sprayable, high adhesion, room temperature cure liquid silicone rubber of claim 1 wherein the B component is prepared by: rapidly dispersing low-volatility dimethylpolysiloxane containing two vinyl groups and inhibitor in a high-speed dispersing machine for 5-15min, adding dimethylpolysiloxane containing two or more Si-H groups, hydrophobic vapor silicon dioxide and bonding aid, continuously dispersing at high speed for 5-15min, and vacuum degassing to obtain component B.
9. A method for preparing the sprayable high-adhesion room temperature curing liquid silicone rubber according to any one of claims 1-8, wherein the component A and the component B are prepared according to the following weight parts 1:1 are mixed by a static mixer.
10. Use of a sprayable high adhesion room temperature curable liquid silicone rubber according to any of claims 1-8, wherein the components a and B are mixed and applied by spraying, after which the glue is applied at room temperature 25 ± 2 ℃ for 30 minutes to achieve surface dry handling and good adhesion in the presence of solder and flux on the PCBA surface for 24 hours.
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| CN202211680344.2A CN116083047A (en) | 2022-12-26 | 2022-12-26 | Sprayable high-adhesion room-temperature-curing liquid silicone rubber and preparation method and application thereof |
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