阅读说明：本技术 一种高透明液体硅橡胶及其制备方法 (High-transparency liquid silicone rubber and preparation method thereof ) 是由 康翼鸿 喻学锋 刘天时 张鑫 于 2021-07-06 设计创作，主要内容包括：本发明涉及硅橡胶领域,提供一种高透明液体硅橡胶及其制备方法,其配方包括A组分和B组分,其中所述A组分包含100份乙烯基硅油、1-15份气凝胶；所述B组分包含5-10份乙烯基硅油,含氢硅油1-10份,有机硅增粘剂1-10份,其他添加剂1-10份；A组分与B组分按照10：1～10：5的比例混合；制备得到的高透明液体硅橡胶具有良好粘接,耐老化、绝缘、高透明的特点,并且黏度低、流动性好,适用于灌封精密、微细的部件；可用于大功率路灯电源、LED电子显示屏、LED电子灌封胶、线路板、LED、LCD大功率灯、手机、超薄电脑、游戏机、数码相机、太阳能板等灌封。(The invention relates to the field of silicon rubber, and provides a high-transparency liquid silicon rubber and a preparation method thereof, wherein the formula of the high-transparency liquid silicon rubber comprises a component A and a component B, wherein the component A comprises 100 parts of vinyl silicone oil and 1-15 parts of aerogel; the component B comprises 5-10 parts of vinyl silicone oil, 1-10 parts of hydrogen-containing silicone oil, 1-10 parts of an organic silicon tackifier and 1-10 parts of other additives; the component A and the component B are mixed according to the proportion of 10: 1-10: 5, mixing in proportion; the prepared high-transparency liquid silicone rubber has the characteristics of good adhesion, aging resistance, insulation and high transparency, is low in viscosity and good in fluidity, and is suitable for filling and sealing precise and fine parts; the LED high-power LED potting adhesive can be used for potting a high-power street lamp power supply, an LED electronic display screen, an LED electronic potting adhesive, a circuit board, an LED, an LCD high-power lamp, a mobile phone, an ultrathin computer, a game machine, a digital camera, a solar panel and the like.)

1. A high-transparency liquid silicone rubber is characterized in that: the formula comprises a component A and a component B, wherein the component A comprises 100 parts of vinyl silicone oil and 1-15 parts of aerogel; the component B comprises 5-10 parts of vinyl silicone oil, 1-10 parts of hydrogen-containing silicone oil, 1-10 parts of an organic silicon tackifier and 1-10 parts of other additives; the component A and the component B are mixed according to the proportion of 10: 1-10: 5, mixing.

2. The highly transparent liquid silicone rubber according to claim 1, wherein: the aerogel is silicon aerogel powder with modified hydrophobic groups; wherein the modified group is one or more of a vinyl hydrophobic group, a methoxy silane hydrophobic group, a glycidoxy silane hydrophobic group and the like.

3. A method for preparing the highly transparent liquid silicone rubber according to claim 1, characterized in that:

1) adding the raw materials of the component A into a kneader, stirring for 1-2 hours at room temperature, and vacuumizing for 5-12 hours at 80-160 ℃ to obtain a base material; the catalyst is added.

2) Fully stirring the component B for 10-60 minutes;

3) uniformly mixing the products obtained in the step 1) and the step 2) respectively, and performing vacuum defoaming for 15-60 minutes to obtain the high-transparency liquid silicone rubber.

4. The method for producing a highly transparent liquid silicone rubber according to claim 3, characterized in that: the vacuum in the step 1) and the step 3) is the reaction condition of vacuum degree of minus 0.08MPa to minus 0.1 MPa.

5. The method for producing a highly transparent liquid silicone rubber according to claim 3, characterized in that: stirring at room temperature in the step 1), and adding aerogel powder in batches according to production.

6. The method for producing a highly transparent liquid silicone rubber according to claim 3, characterized in that: the temperature of the vacuum pumping in the step 1) is preferably 120-140 ℃.

7. The method for producing a highly transparent liquid silicone rubber according to claim 3, characterized in that: the catalyst is a platinum catalyst.

8. A filling and sealing method for liquid silicone rubber of electronic components, which is characterized in that the high-transparency liquid silicone rubber of any claim 1-2 is used for filling and sealing the electronic components in the forms of injection, filling and coating, and is cured at room temperature or by heating.

9. An electronic component, which partially comprises the highly transparent liquid silicone rubber as claimed in any one of claims 1 to 2.

Technical Field

The invention relates to the field of silicone rubber, and particularly relates to high-transparency liquid silicone rubber and a preparation method thereof.

Background

Liquid silicone rubber is widely used in the field of consumer electronics products due to its inherent excellent waterproof properties, excellent elasticity, aging resistance, biocompatibility, high production efficiency, and the like, and can realize the manufacture of products with complex shapes. With the continuous upgrading of the functions and performances of products and the increasing requirements of consumers on the quality of appearance, hand feeling, experience and the like, the requirements of consumer electronic products on the performance and processing convenience of materials are also increased. The demand for liquid silicone rubber products is constantly increasing. Flexible electronic components such as OLEDs, OPVs and other high performance products need to be packaged and protected by materials with good weather resistance, good insulation and high light transmittance, so that the packaged electronic components are clearly visible and convenient to use and detect.

The main fillers of the existing liquid silicone rubber are white carbon black, hollow glass beads, silicone resin and the like. However, the white carbon black has the defects of more surface silicon hydroxyl groups, easy product structurization, low product transparency, short product storage period and the like; and the hydrophobic modification degree of the white carbon black can not reach the complete hydrophobicity. At present, the high-transparency liquid silicone rubber is prepared by using silicone resin as a filler, but the prepared liquid silicone rubber has poor mechanical properties, and bonding points are easy to fall off to cause damage to components.

Disclosure of Invention

In order to overcome the defects in the prior art, the invention provides the high-transparency liquid silicone rubber which has the characteristics of good adhesion, aging resistance, insulation and high transparency, has low viscosity and good fluidity, and is suitable for encapsulating precise and fine parts; the LED high-power LED potting adhesive can be used for potting a high-power street lamp power supply, an LED electronic display screen, an LED electronic potting adhesive, a circuit board, an LED, an LCD high-power lamp, a mobile phone, an ultrathin computer, a game machine, a digital camera, a solar panel and the like.

In order to solve the problems, the invention is realized by the following technical scheme:

the formula of the high-transparency liquid silicone rubber comprises a component A and a component B, wherein the component A comprises 100 parts of vinyl silicone oil and 1-15 parts of aerogel; the component B comprises 5-10 parts of vinyl silicone oil, 1-10 parts of hydrogen-containing silicone oil, 1-10 parts of an organic silicon tackifier and 1-10 parts of other additives; the component A and the component B are mixed according to the proportion of 10: 1-10: 5, mixing.

The aerogel is silicon aerogel powder with modified hydrophobic groups; wherein the modified group is one or more of a vinyl hydrophobic group, a methoxy silane hydrophobic group, a glycidoxy silane hydrophobic group and the like.

The preparation method of the high-transparency liquid silicone rubber comprises the following steps:

1) adding the raw materials of the component A into a kneader, stirring for 1-2 hours at room temperature, and vacuumizing for 5-12 hours at 80-160 ℃ to obtain a base material; the catalyst is added.

2) Fully stirring the component B for 10-60 minutes;

3) uniformly mixing the products obtained in the step 1) and the step 2) respectively, and performing vacuum defoaming for 15-60 minutes to obtain the high-transparency liquid silicone rubber.

Specifically, the vacuum in the step 1) and the step 3) is the reaction condition of vacuum degree of minus 0.08MPa to minus 0.1 MPa.

Specifically, the aerogel powder is added in batches according to production while stirring at room temperature in the step 1).

Specifically, the temperature of the evacuation in step 1) is preferably 120 ℃ to 140 ℃.

Specifically, the catalyst is a platinum catalyst.

The invention also provides a potting method for the liquid silicone rubber of the electronic component, which is characterized in that any one of the high-transparency liquid silicone rubbers is used for potting the electronic component in the forms of injection, potting and coating and is cured at room temperature or by heating. Curing is affected by temperature and thickness, and heat curing can be considered when applying thicker thicknesses.

The invention also provides an electronic component, which partially comprises any one of the high-transparency liquid silicone rubber.

The invention has the beneficial effects that:

according to the invention, the silicon aerogel powder with the modified hydrophobic groups is used as a filler, so that the cross-linking points of the system are increased, and the mechanical properties of the product are improved. By adding the powder in batches, the dispersion of the powder is facilitated, and the transparency and the processing performance of the system are improved. By controlling proper temperature, the yellowing risk of the product is reduced, the vacuum degree and the vacuum time are controlled, air bubbles are reasonably discharged, and the scorching risk of the product is reduced. Compared with the traditional liquid silicone rubber taking vinyl silicone resin as a filler, the liquid silicone rubber prepared from aerogel powder has greatly improved mechanical properties and is suitable for more fields. The prepared liquid silicone rubber has the bonding strength with various base materials such as glass, PE, epoxy resin and the like of more than 3.5kN/m, the light transmittance is more than 97 percent, the haze is less than 2 percent, the tensile strength is more than 7MPa, the tear strength is more than 10KN/m, and the elongation is more than 300 percent. The aerogel powder is used as a filler, the existing process and newly added equipment are not required to be changed, and the acceptability of manufacturers is high.

Detailed Description

The technical solution of the present invention is further elaborated below with reference to the embodiments.

Example 1

Adding 100 parts of vinyl silicone oil into a kneading machine, adding 2 parts of aerogel powder, kneading for 30min to obtain a transparent and uniform system, continuously adding 1 part of aerogel powder, heating to 80-120 ℃, after the powder is uniform, vacuumizing, carrying out heat preservation and kneading for 5h, cooling, adding a catalyst, after the uniform kneading, obtaining a transparent material, and filling to obtain a component A.

And (3) adding 5 parts of vinyl silicone oil, 20 parts of hydrogen-containing silicone oil, 2 parts of an organic silicon tackifier and 2 parts of other additives into a kneader, kneading at room temperature for 20min, and filling to obtain a component B.

According to the component A: and (3) stirring the component B at the ratio of 5:1 for 30min, vacuumizing and discharging 25mim in the process to obtain a uniform transparent material without mechanical impurities, and filling to obtain the high-transparency liquid silicone rubber. After injection molding, the product is subjected to performance test, and the light transmittance is 98%, the haze is 1%, the tensile strength is 7.5MPa, the tear strength is 11KN/m, and the elongation is 350%.

Example 2

Adding 100 parts of vinyl silicone oil into a kneading machine, adding 4 parts of aerogel powder, kneading for 50min, adding 3 parts of aerogel powder, kneading for 30min to obtain a transparent and uniform system, continuously adding 1 part of aerogel powder, heating to 80-120 ℃, after the powder is uniform, vacuumizing, carrying out heat preservation and kneading for 7h, cooling, adding a catalyst, after the uniform kneading, obtaining a transparent material, and filling to obtain the component A.

And (3) adding 5 parts of vinyl silicone oil, 20 parts of hydrogen-containing silicone oil, 2 parts of an organic silicon tackifier and 3 parts of other additives into a kneader, kneading at room temperature for 30min, and filling to obtain a component B.

According to the component A: and (3) stirring the component B at the ratio of 5:1 for 40min, vacuumizing and discharging bubbles for 35min to obtain a uniform and transparent material without mechanical impurities, and filling to obtain the high-transparency liquid silicone rubber. After injection molding, the product is subjected to performance test, and the light transmittance is 99%, the haze is 1%, the tensile strength is 9.1MPa, the tear strength is 16KN/m, and the elongation is 325%.

Example 3

Adding 100 parts of vinyl silicone oil into a kneading machine, adding 3 parts of aerogel powder, kneading for 50min, adding 2 parts of aerogel powder, kneading for 30min to obtain a transparent and uniform system, continuously adding 1 part of aerogel powder, heating to 80-120 ℃, after the powder is uniform, vacuumizing, carrying out heat preservation and kneading for 7h, cooling, adding a catalyst, after the uniform kneading, obtaining a transparent material, and filling to obtain a component A.

And (3) adding 6 parts of vinyl silicone oil, 30 parts of hydrogen-containing silicone oil, 2 parts of an organic silicon tackifier and 3 parts of other additives into a kneader, kneading at room temperature for 30min, and filling to obtain a component B.

According to the component A: and (3) stirring the component B at a ratio of 4:1 for 40min, vacuumizing and discharging 35 mm in the process to obtain a uniform and transparent material without mechanical impurities, and filling to obtain the high-transparency liquid silicone rubber. After injection molding, the product is subjected to performance test, and the light transmittance is 99%, the haze is 1%, the tensile strength is 8.5MPa, the tear strength is 12KN/m, and the elongation is 370%.

Example 4

Adding 100 parts of vinyl silicone oil into a kneading machine, adding 3 parts of aerogel powder, kneading for 50min, adding 2 parts of aerogel powder, kneading for 30min to obtain a transparent and uniform system, continuously adding 1 part of aerogel powder, heating to 80-120 ℃, after the powder is uniform, vacuumizing, carrying out heat preservation and kneading for 7h, cooling, adding a catalyst, after the uniform kneading, obtaining a transparent material, and filling to obtain a component A.

And (3) adding 5 parts of vinyl silicone oil, 30 parts of hydrogen-containing silicone oil, 2 parts of an organic silicon tackifier and 3 parts of other additives into a kneader, kneading at room temperature for 30min, and filling to obtain a component B.

According to the component A: and (3) stirring the component B at a ratio of 5:3 for 50min, vacuumizing for 45 mm in the period to obtain a uniform transparent material without mechanical impurities, and filling to obtain the high-transparency liquid silicone rubber. After injection molding, the product is subjected to performance test, and the light transmittance is 98%, the haze is 1%, the tensile strength is 7.2MPa, the tear strength is 8KN/m, and the elongation is 310%.

Comparative example 1

Adding 100 parts of vinyl silicone oil into a kneading machine, adding 6 parts of organic silicon resin, kneading for 30min to obtain a transparent and uniform system, heating to 80-120 ℃, after the powder is uniform, vacuumizing, keeping the temperature, kneading for 7h, cooling, adding a catalyst, uniformly kneading, then obtaining a transparent material, and filling to obtain the component A.

And (3) adding 5 parts of vinyl silicone oil, 30 parts of hydrogen-containing silicone oil, 2 parts of an organic silicon tackifier and 3 parts of other additives into a kneader, kneading at room temperature for 30min, and filling to obtain a component B.

According to the component A: and (3) stirring the component B at the ratio of 5:1 for 30min, vacuumizing for 25mim in the process to obtain a uniform transparent material without mechanical impurities, and filling to obtain the high-transparency liquid silicone rubber. After injection molding, the product is subjected to performance test, and the light transmittance is 98%, the haze is 1%, the tensile strength is 3.5MPa, the tear strength is 3KN/m, and the elongation is 250%.

Comparative example 2

Adding 100 parts of vinyl silicone oil into a kneading machine, adding 3 parts of fumed silica powder, kneading for 50min, adding 2 parts of fumed silica powder, kneading for 30min to obtain a transparent and uniform system, continuously adding 1 part of fumed silica powder, heating to 80-120 ℃, after the powder is uniform, vacuumizing, carrying out heat preservation kneading for 7h, cooling, adding a catalyst, kneading uniformly, and then carrying out transparent material filling to obtain the component A.

And (3) adding 5 parts of vinyl silicone oil, 30 parts of hydrogen-containing silicone oil, 2 parts of an organic silicon tackifier and 3 parts of other additives into a kneader, kneading at room temperature for 30min, and filling to obtain a component B.

According to the component A: and (3) stirring the component B at the ratio of 5:1 for 30min, vacuumizing for 25mim in the process to obtain a uniform transparent material without mechanical impurities, and filling to obtain the high-transparency liquid silicone rubber. After injection molding, the product is subjected to performance test, and the light transmittance is 92%, the haze is 4%, the tensile strength is 7.2MPa, the tear strength is 8.5KN/m, and the elongation is 370%.

The silicone rubbers prepared in examples 1 to 4 and comparative examples 1 to 2 were subjected to performance tests as shown in Table 1.