Composite silicone rubber cloth with light diffusion effect and preparation method thereof

Abstract

The present invention relates to the technical field of silicone rubber cloth, and specifically discloses a composite silicone rubber cloth with light diffusion effect and a preparation method thereof. The composite silicone rubber cloth comprises a substrate layer and a silicone rubber layer with light diffusion effect coated on the upper and lower surfaces of the substrate layer, wherein the silicone rubber layer with light diffusion effect comprises raw materials of vinyl polydimethylsiloxane, vinyl MQ silicone resin, silazane, reinforcing filler, light diffuser, hydrogen-containing silicone oil, platinum catalyst, inhibitor, and tackifier; the preparation method comprises mixing the raw materials of the silicone rubber layer to obtain silicone rubber raw materials, coating the silicone rubber raw materials on release paper, bonding the substrate layer on the silicone layer after baking and curing, coating the silicone rubber raw materials on the surface of the substrate layer, and peeling off the release paper after baking and curing again; the composite silicone rubber cloth prepared by the present invention can have high light transmittance, good environmental stability and excellent processing performance while maintaining excellent light diffusion effect, and has broad application prospects.

Description

Technical Field

[0001] The invention relates to the technical field of silicone rubber cloth, and more specifically, to a composite silicone rubber cloth with light diffusion effect and a preparation method thereof. Background Art

[0002] Silicone rubber cloth is a special material made by coating silicone rubber on the surface of glass fiber or polyester fiber. As a new functional composite material, it combines the physical properties of the substrate and the chemical stability of silicone rubber. With its excellent high and low temperature resistance, weather resistance, physiological inertness and other characteristics, silicone rubber cloth maintains good stability in the temperature range of -40℃ to 200℃ and can resist corrosion from a variety of chemicals. In addition, silicone rubber cloth has the properties of being non-toxic and odorless, moisture-proof and environmentally friendly, and recyclable. It is widely used in aerospace, automobile manufacturing, electronics and electrical fields, and is particularly suitable for use outdoors or in harsh environments.

[0003] With the development of science and technology, the requirements for material performance in various fields have been improved, especially in optical applications, where uniform distribution of light and soft effects have become key requirements. Existing light diffusion materials such as plastics and glass can achieve basic light diffusion effects, but they have defects such as insufficient flexibility, durability and processing flexibility. They are easily damaged during use, have poor stability in high temperature environments, and are prone to deformation or aging.

[0004] Composite silicone rubber cloth is regarded as an ideal light diffusion material due to its excellent flexibility, heat resistance and optical properties. By adding a light diffuser to silicone rubber, the propagation path of light can be effectively changed to achieve uniform scattering and softening of light. However, the composite silicone rubber cloth currently on the market still has technical problems in terms of optical performance, including unsatisfactory light diffusion effect, difficulty in balancing transparency and diffusion, and insufficient stability and durability in harsh environments. Based on the above statements, the present invention proposes a composite silicone rubber cloth with light diffusion effect and a preparation method thereof. Summary of the invention

[0005] In order to solve the technical problems that still exist in the optical properties of the existing composite silicone rubber cloth, including unsatisfactory light diffusion effect, difficulty in balancing transparency and diffusion, and insufficient stability and durability in harsh environments, the present invention provides a composite silicone rubber cloth with light diffusion effect and a preparation method thereof. The composite silicone rubber cloth of the present invention can maintain excellent light diffusion effect while having high light transmittance, good environmental stability and excellent processing performance, and has broad application prospects.

[0006] In the first aspect, the present invention provides a composite silicone rubber cloth with light diffusion effect, which adopts the following technical solution:

[0007] A composite silicone rubber cloth with a light diffusion effect comprises a substrate layer and a silicone rubber layer with a light diffusion effect coated on the upper and lower surfaces of the substrate layer. The silicone rubber layer with a light diffusion effect comprises the following raw materials in parts by weight:

[0008]

[0009] Preferably, the mass ratio of the vinyl polydimethylsiloxane, the vinyl MQ silicone resin and the silazane is 25:4-6:1.

[0010] Preferably, the silicone rubber layer with light diffusion effect comprises the following raw materials in parts by weight:

[0011]

[0012] Preferably, the substrate layer material is at least one of glass fiber, nylon, spandex, polypropylene, chlorofiber, polyester, acrylic, aramid, and vinylon, and the substrate layer structure is a mesh structure.

[0013] Preferably, the molecular chain of the vinyl polydimethylsiloxane contains at least two vinyl groups bonded to silicon and located at the chain end or side chain.

[0014] Preferably, the viscosity of the vinyl polydimethylsiloxane is in the range of 500-100000 cs, and the mass percentage of vinyl is in the range of 0.1%-5%.

[0015] Preferably, the mass percentage of vinyl in the vinyl MQ silicone resin is 0.2%-5%.

[0016] Preferably, the mass percentage of hydrogen in the hydrogen-containing silicone oil is 0.1%-1.2%.

[0017] Preferably, the reinforcing filler is fumed silica and / or precipitated silica.

[0018] Preferably, the light diffuser is at least one of spherical silicon powder, spherical alumina powder, spherical silicone resin powder, spherical glass bead powder, spherical silicon carbide, and spherical silicon nitride.

[0019] Preferably, the platinum content of the platinum catalyst is 500-5000 ppm, and the platinum catalyst is selected from at least one of chloroplatinic acid, an alcohol solution of chloroplatinic acid, a platinum complex of divinyltetramethyldisiloxane, and a platinum complex of tetramethyltetravinylcyclotetrasiloxane.

[0020] Preferably, the inhibitor is at least one of methylbutynol, ethynylcyclohexanol, polyvinylsiloxane polymer, amide compound or phosphorus-containing compound.

[0021] Preferably, the tackifier is at least one of vinyltrimethoxysilane, vinyltriethoxysilane, β-(3,4-epoxycyclohexane)ethyltrimethoxysilane, 3-glycidyloxypropyltrimethoxysilane, 3-glycidyloxypropyltriethoxysilane, 3-(methacryloxy)propyltrimethoxysilane, 3-(methacryloxy)propyltriethoxysilane, 3-(acryloxy)propyltrimethoxysilane, trimethoxyhydrogensilane and triethoxyhydrogensilane.

[0022] Preferably, the tackifier is a compound of vinyltriethoxysilane and β-(3,4-epoxycyclohexane)ethyltrimethoxysilane in a mass ratio of 2-3:1.

[0023] In a second aspect, the present invention provides a method for preparing a composite silicone rubber cloth having a light diffusion effect, which adopts the following technical solution:

[0024] A method for preparing a composite silicone rubber cloth with a light diffusion effect comprises the following steps:

[0025] S1. Weigh the raw materials of the silicone rubber layer with light diffusion effect, vinyl polydimethylsiloxane, vinyl MQ silicone resin, silazane, reinforcing filler, light diffusing agent, hydrogen-containing silicone oil, platinum catalyst, inhibitor, and tackifier, by weight and set aside;

[0026] S2, vinyl polydimethylsiloxane, vinyl MQ silicone resin, reinforcing filler, light diffusing agent are put into a planetary mixer in sequence, silazane and deionized water are added, stirred at 90-110° C. for 2-3 hours, then heated to 140-160° C., vacuumed for 2-3 hours, and a silicone rubber base is obtained;

[0027] S3, after the silicone rubber base is cooled, hydrogen-containing silicone oil, inhibitor, platinum catalyst and tackifier are added in sequence, and stirred for 0.5-1h under vacuum conditions to obtain silicone rubber raw materials;

[0028] S4, coating the silicone rubber raw material on the release paper, baking and curing, laminating the substrate layer on the silicone layer, and coating the silicone rubber raw material on the surface of the substrate layer, baking and curing again, and peeling off the release paper to obtain the desired composite silicone rubber cloth with light diffusion effect.

[0029] Preferably, the specific operations of step S4 are as follows:

[0030] The release paper is coated with silicone rubber raw materials with a coating thickness of 0.05-2mm, and the substrate layer is laminated on the cured silicone layer at 100-140℃ for 3-5min. The substrate layer is coated with silicone rubber raw materials with a coating thickness of 0.05-2mm, and the substrate layer is baked in a tunnel oven at 100-140℃ for 5-10min to cure. The release paper is peeled off to obtain the required composite silicone rubber cloth with light diffusion effect.

[0031] Preferably, the coating method in step S4 is a scraper method, a screen printing method, a spin coating method, a brush coating method, a casting method, etc.

[0032] In summary, the present invention has the following beneficial effects:

[0033] 1. The present invention adopts vinyl polydimethylsiloxane, vinyl MQ silicone resin, silazane, reinforcing filler, light diffuser, hydrogen-containing silicone oil, platinum catalyst, inhibitor, tackifier and other raw materials to prepare a silicone rubber layer with light diffusion effect, and obtains a composite silicone rubber cloth by coating the silicone rubber layer with light diffusion effect on the upper and lower surfaces of the substrate layer. The present invention has a simple preparation process and high production efficiency, and is suitable for industrial production. The obtained composite silicone rubber cloth can maintain excellent light diffusion effect while having high light transmittance, good environmental stability and excellent processing performance, and has broad application prospects.

[0034] 2. The present invention adopts vinyl polydimethylsiloxane as the main material of the silicone rubber layer with light diffusion effect, which can provide good flexibility, transparency and excellent thermal and chemical stability; the introduction of vinyl MQ silicone resin can enhance the mechanical strength, weather resistance and light diffusion of the material; the introduction of silazane can further improve the heat resistance and mechanical properties of the material; by controlling the formula ratio, the three work together to provide excellent mechanical properties and environmental stability while maintaining high light transmittance and excellent light diffusion effect of the composite silicone rubber cloth.

[0035] 3. The tackifier of the present invention is a compound of vinyl triethoxysilane and β-(3,4-epoxycyclohexane) ethyl trimethoxysilane. Vinyl triethoxysilane can provide reaction activity and improve the adhesion to the substrate. The epoxy group in β-(3,4-epoxycyclohexane) ethyl trimethoxysilane can further enhance the bonding strength and improve the bonding strength to the substrate layer. The compound tackifier of the present invention can simultaneously improve the adhesion and mechanical properties, ensuring that the composite silicone rubber cloth can maintain stable adhesion and optical properties under various environmental conditions. DETAILED DESCRIPTION

[0036] The present invention is further described in detail below with reference to the embodiments.

[0037] The materials, reagents, etc. used in the present invention can be obtained from commercial channels unless otherwise specified. The raw materials used in the embodiments and comparative examples of the present invention are as follows: vinyl polydimethylsiloxane is a vinyl-terminated silicone oil, brand Watson, CAS No. 68083-19-2, provided by Hubei Watson Chemical Technology Co., Ltd.; vinyl MQ silicone resin, brand Yamade, provided by Hubei Yamade Biomedicine Co., Ltd.; silazane CAS No.: 999-97-3; precipitated silica, brand Shuangshi, mesh number 325 mesh, provided by Lingshou County Shuangshi Mineral Products Processing Plant; spherical silicone resin powder is silicone resin spherical micropowder X-52-7056A, brand Shin-Etsu, provided by Foshan Jieke New Materials Co., Ltd.; hydrogen-containing silicone oil is hydrogen-terminated silicone oil, brand Xingyan, CAS No. 70900-21-9, provided by Hubei Xingyan New Materials Technology Co., Ltd.; platinum complex of divinyltetramethyldisiloxane, brand IOTA, model IOTA 8100, provided by Anhui Aiyota Silicone Oil Co., Ltd.; methyl butynol CAS number: 115-19-5; vinyl triethoxysilane CAS number: 78-08-0; β-(3,4-epoxycyclohexane)ethyl trimethoxysilane CAS number: 3388-04-3; glass fiber mesh cloth, brand Yuanchuang, weight 150g, thickness 2mm.

[0038] Embodiment 1-3 provides a composite silicone rubber cloth with light diffusion effect and a preparation method thereof.

[0039] Example 1

[0040] A composite silicone rubber cloth with light diffusion effect, comprising a substrate layer and silicone rubber layers with light diffusion effect coated on the upper and lower surfaces of the substrate layer, wherein the substrate layer is a glass fiber mesh cloth;

[0041] The silicone rubber layer with light diffusion effect comprises the following raw materials in parts by weight:

[0042]

[0043] Among them, the reinforcing material is precipitated silica; the light diffuser is spherical silicone resin powder; the platinum catalyst is a platinum complex of divinyltetramethyldisiloxane; the inhibitor is methyl butynol; and the viscosity enhancer is a compound of vinyltriethoxysilane and β-(3,4-epoxycyclohexane)ethyltrimethoxysilane in a mass ratio of 3:1.

[0044] A method for preparing a composite silicone rubber cloth with a light diffusion effect comprises the following steps:

[0045] S1. Weigh the raw materials of the silicone rubber layer with light diffusion effect, vinyl polydimethylsiloxane, vinyl MQ silicone resin, silazane, reinforcing filler, light diffusing agent, hydrogen-containing silicone oil, platinum catalyst, inhibitor, and tackifier, by weight and set aside;

[0046] S2, vinyl polydimethylsiloxane, vinyl MQ silicone resin, reinforcing filler, light diffusing agent are put into a planetary mixer in sequence, silazane and deionized water (the amount of deionized water is 1.5 times the amount of vinyl polydimethylsiloxane) are added, the stirring speed is controlled to 800r / min at 110°C, stirring for 2h, and then the temperature is raised to 160°C, and vacuum is drawn for 2h to obtain a silicone rubber base;

[0047] S3, after the silicone rubber base is cooled, hydrogen-containing silicone oil, inhibitor, platinum catalyst and tackifier are added in sequence, and stirring is continued for 0.5h under vacuum conditions to obtain silicone rubber raw materials;

[0048] S4. Use spin coating to coat the silicone rubber raw material on the release paper with a coating thickness of 1 mm, bake it in a tunnel oven at 140°C for 3 minutes to cure, attach the substrate layer to the cured silicone layer, and coat the silicone rubber raw material on the surface of the substrate layer with a coating thickness of 1 mm, then bake it in a tunnel oven at 140°C for 5 minutes to cure, peel off the release paper, and you will get the required composite silicone rubber cloth with light diffusion effect.

[0049] Example 2

[0050] A composite silicone rubber cloth with light diffusion effect, comprising a substrate layer and silicone rubber layers with light diffusion effect coated on the upper and lower surfaces of the substrate layer, wherein the substrate layer is a glass fiber mesh cloth;

[0051] The silicone rubber layer with light diffusion effect comprises the following raw materials in parts by weight:

[0052]

[0053]

[0054] Among them, the reinforcing material is precipitated silica; the light diffuser is spherical silicone resin powder; the platinum catalyst is a platinum complex of divinyltetramethyldisiloxane; the inhibitor is methyl butynol; and the viscosity enhancer is a compound of vinyltriethoxysilane and β-(3,4-epoxycyclohexane)ethyltrimethoxysilane in a mass ratio of 2.5:1.

[0055] A method for preparing a composite silicone rubber cloth with a light diffusion effect comprises the following steps:

[0056] S1. Weigh the raw materials of the silicone rubber layer with light diffusion effect, vinyl polydimethylsiloxane, vinyl MQ silicone resin, silazane, reinforcing filler, light diffusing agent, hydrogen-containing silicone oil, platinum catalyst, inhibitor, and tackifier, by weight and set aside;

[0057] S2, vinyl polydimethylsiloxane, vinyl MQ silicone resin, reinforcing filler, light diffusing agent are put into a planetary mixer in sequence, silazane and deionized water (the amount of deionized water is 1.5 times the amount of vinyl polydimethylsiloxane) are added, the stirring speed is controlled to 700r / min at 100°C, stirring for 2.5h, and then the temperature is raised to 150°C, and vacuum is evacuated for 2.5h to obtain a silicone rubber base;

[0058] S3, after the silicone rubber base is cooled, hydrogen-containing silicone oil, inhibitor, platinum catalyst and tackifier are added in sequence, and stirring is continued for 0.8h under vacuum conditions to obtain silicone rubber raw materials;

[0059] S4. Use spin coating to coat the silicone rubber raw material on the release paper with a coating thickness of 1mm, bake it in a tunnel oven at 120℃ for 4 minutes to cure, attach the substrate layer to the cured silicone layer, and coat the silicone rubber raw material on the surface of the substrate layer with a coating thickness of 1mm, then bake it in a tunnel oven at 120℃ for 5-10 minutes to cure, peel off the release paper, and you will get the required composite silicone rubber cloth with light diffusion effect.

[0060] Example 3

[0061] A composite silicone rubber cloth with light diffusion effect, comprising a substrate layer and silicone rubber layers with light diffusion effect coated on the upper and lower surfaces of the substrate layer, wherein the substrate layer is a glass fiber mesh cloth;

[0062] The silicone rubber layer with light diffusion effect comprises the following raw materials in parts by weight:

[0063]

[0064] Among them, the reinforcing material is precipitated silica; the light diffuser is spherical silicone resin powder; the platinum catalyst is a platinum complex of divinyltetramethyldisiloxane; the inhibitor is methyl butynol; and the viscosity enhancer is a compound of vinyltriethoxysilane and β-(3,4-epoxycyclohexane)ethyltrimethoxysilane in a mass ratio of 2:1.

[0065] A method for preparing a composite silicone rubber cloth with a light diffusion effect comprises the following steps:

[0066] S1. Weigh the raw materials of the silicone rubber layer with light diffusion effect, vinyl polydimethylsiloxane, vinyl MQ silicone resin, silazane, reinforcing filler, light diffusing agent, hydrogen-containing silicone oil, platinum catalyst, inhibitor, and tackifier, by weight and set aside;

[0067] S2, vinyl polydimethylsiloxane, vinyl MQ silicone resin, reinforcing filler, light diffusing agent are put into a planetary mixer in sequence, silazane and deionized water (the amount of deionized water is 1.5 times the amount of vinyl polydimethylsiloxane) are added, the stirring speed is controlled to 600r / min at 90°C, stirring for 3h, and then the temperature is raised to 140°C, and vacuum is drawn for 3h to obtain a silicone rubber base;

[0068] S3, after the silicone rubber base is cooled, hydrogen-containing silicone oil, inhibitor, platinum catalyst and tackifier are added in sequence, and stirring is continued for 1 hour under vacuum conditions to obtain silicone rubber raw materials;

[0069] S4. Use spin coating to coat the silicone rubber raw material on the release paper with a coating thickness of 1 mm, bake it in a tunnel oven at 100°C for 5 minutes to cure, attach the substrate layer to the cured silicone layer, and coat the silicone rubber raw material on the surface of the substrate layer with a coating thickness of 1 mm, then bake it in a tunnel oven at 100°C for 10 minutes to cure, peel off the release paper, and you will get the required composite silicone rubber cloth with light diffusion effect.

[0070] Example 4

[0071] A composite silicone rubber cloth with light diffusion effect, comprising a substrate layer and silicone rubber layers with light diffusion effect coated on the upper and lower surfaces of the substrate layer, wherein the substrate layer is a glass fiber mesh cloth;

[0072] The silicone rubber layer with light diffusion effect comprises the following raw materials in parts by weight:

[0073]

[0074]

[0075] Among them, the reinforcing material is precipitated silica; the light diffuser is spherical silicone resin powder; the platinum catalyst is a platinum complex of divinyltetramethyldisiloxane; the inhibitor is methyl butynol; and the viscosity enhancer is a compound of vinyltriethoxysilane and β-(3,4-epoxycyclohexane)ethyltrimethoxysilane in a mass ratio of 2.5:1.

[0076] A method for preparing a composite silicone rubber cloth with a light diffusion effect comprises the following steps:

[0077] S1. Weigh the raw materials of the silicone rubber layer with light diffusion effect, vinyl polydimethylsiloxane, vinyl MQ silicone resin, silazane, reinforcing filler, light diffusing agent, hydrogen-containing silicone oil, platinum catalyst, inhibitor, and tackifier, by weight and set aside;

[0078] S2, vinyl polydimethylsiloxane, vinyl MQ silicone resin, reinforcing filler, light diffusing agent are put into a planetary mixer in sequence, silazane and deionized water (the amount of deionized water is 1.5 times the amount of vinyl polydimethylsiloxane) are added, the stirring speed is controlled to 700r / min at 100°C, stirring for 2.5h, and then the temperature is raised to 150°C, and vacuum is evacuated for 2.5h to obtain a silicone rubber base;

[0079] S3, after the silicone rubber base is cooled, hydrogen-containing silicone oil, inhibitor, platinum catalyst and tackifier are added in sequence, and stirring is continued for 0.8h under vacuum conditions to obtain silicone rubber raw materials;

[0080] S4. Use spin coating to coat the silicone rubber raw material on the release paper with a coating thickness of 1mm, bake it in a tunnel oven at 120℃ for 4 minutes to cure, attach the substrate layer to the cured silicone layer, and coat the silicone rubber raw material on the surface of the substrate layer with a coating thickness of 1mm, then bake it in a tunnel oven at 120℃ for 5-10 minutes to cure, peel off the release paper, and you will get the required composite silicone rubber cloth with light diffusion effect.

[0081] In order to verify the performance of the composite silicone rubber cloth with light diffusion effect obtained in Examples 1-4 of the present invention, the present invention sets up Comparative Examples 1-5.

[0082] Comparative Example 1

[0083] Comparative Example 1 is different from Example 1 only in that 105 parts of vinyl polydimethylsiloxane is used and silazane is not used, specifically as follows:

[0084] A composite silicone rubber cloth with light diffusion effect, comprising a substrate layer and silicone rubber layers with light diffusion effect coated on the upper and lower surfaces of the substrate layer, wherein the substrate layer is a glass fiber mesh cloth;

[0085] The silicone rubber layer with light diffusion effect comprises the following raw materials in parts by weight:

[0086]

[0087] Among them, the reinforcing material is precipitated silica; the light diffuser is spherical silicone resin powder; the platinum catalyst is a platinum complex of divinyltetramethyldisiloxane; the inhibitor is methyl butynol; and the viscosity enhancer is a compound of vinyltriethoxysilane and β-(3,4-epoxycyclohexane)ethyltrimethoxysilane in a mass ratio of 3:1.

[0088] A method for preparing a composite silicone rubber cloth with a light diffusion effect comprises the following steps:

[0089] S1. Weigh the raw materials of the silicone rubber layer with light diffusion effect, vinyl polydimethylsiloxane, vinyl MQ silicone resin, reinforcing filler, light diffusing agent, hydrogen-containing silicone oil, platinum catalyst, inhibitor, and tackifier, by weight, and set aside for later use;

[0090] S2, vinyl polydimethylsiloxane, vinyl MQ silicone resin, reinforcing filler, light diffusing agent are put into a planetary mixer in sequence, deionized water is added (the amount of deionized water is 1.5 times the amount of vinyl polydimethylsiloxane), the stirring speed is controlled to 800r / min at 110°C, stirring for 2h, and then the temperature is raised to 160°C, and vacuum is drawn for 2h to obtain a silicone rubber base;

[0091] S3, after the silicone rubber base is cooled, hydrogen-containing silicone oil, inhibitor, platinum catalyst and tackifier are added in sequence, and stirring is continued for 0.5h under vacuum conditions to obtain silicone rubber raw materials;

[0092] S4. Use spin coating to coat the silicone rubber raw material on the release paper with a coating thickness of 1 mm, bake it in a tunnel oven at 140°C for 3 minutes to cure, attach the substrate layer to the cured silicone layer, and coat the silicone rubber raw material on the surface of the substrate layer with a coating thickness of 1 mm, then bake it in a tunnel oven at 140°C for 5 minutes to cure, peel off the release paper, and you will get the required composite silicone rubber cloth with light diffusion effect.

[0093] Comparative Example 2

[0094] Comparative Example 2 is different from Example 1 only in that 130 parts of vinyl polydimethylsiloxane is used and vinyl MQ silicone resin is not used, specifically as follows:

[0095] A composite silicone rubber cloth with light diffusion effect, comprising a substrate layer and silicone rubber layers with light diffusion effect coated on the upper and lower surfaces of the substrate layer, wherein the substrate layer is a glass fiber mesh cloth;

[0096] The silicone rubber layer with light diffusion effect comprises the following raw materials in parts by weight:

[0097]

[0098]

[0099] Among them, the reinforcing material is precipitated silica; the light diffuser is spherical silicone resin powder; the platinum catalyst is a platinum complex of divinyltetramethyldisiloxane; the inhibitor is methyl butynol; and the viscosity enhancer is a compound of vinyltriethoxysilane and β-(3,4-epoxycyclohexane)ethyltrimethoxysilane in a mass ratio of 3:1.

[0100] A method for preparing a composite silicone rubber cloth with a light diffusion effect comprises the following steps:

[0101] S1. Weigh the raw materials of the silicone rubber layer with light diffusion effect, vinyl polydimethylsiloxane, silazane, reinforcing filler, light diffusing agent, hydrogen-containing silicone oil, platinum catalyst, inhibitor, and tackifier, by weight, and set aside for later use;

[0102] S2. Vinyl polydimethylsiloxane, reinforcing filler and light diffusing agent are sequentially put into a planetary mixer, and silazane and deionized water (the amount of deionized water is 1.5 times the amount of vinyl polydimethylsiloxane) are added. Under the condition of 110° C., the stirring speed is controlled to 800 r / min, and stirred for 2 hours. Then, the temperature is raised to 160° C. and vacuumed for 2 hours to obtain a silicone rubber base.

[0103] S3, after the silicone rubber base is cooled, hydrogen-containing silicone oil, inhibitor, platinum catalyst and tackifier are added in sequence, and stirring is continued for 0.5h under vacuum conditions to obtain silicone rubber raw materials;

[0104] S4. Use spin coating to coat the silicone rubber raw material on the release paper with a coating thickness of 1 mm, bake it in a tunnel oven at 140°C for 3 minutes to cure, attach the substrate layer to the cured silicone layer, and coat the silicone rubber raw material on the surface of the substrate layer with a coating thickness of 1 mm, then bake it in a tunnel oven at 140°C for 5 minutes to cure, peel off the release paper, and you will get the required composite silicone rubber cloth with light diffusion effect.

[0105] Comparative Example 3

[0106] Comparative Example 3 is different from Example 1 only in that 135 parts of vinyl polydimethylsiloxane is used, and vinyl MQ silicone resin and silazane are not used, specifically as follows:

[0107] A composite silicone rubber cloth with light diffusion effect, comprising a substrate layer and silicone rubber layers with light diffusion effect coated on the upper and lower surfaces of the substrate layer, wherein the substrate layer is a glass fiber mesh cloth;

[0108] The silicone rubber layer with light diffusion effect comprises the following raw materials in parts by weight:

[0109]

[0110] Among them, the reinforcing material is precipitated silica; the light diffuser is spherical silicone resin powder; the platinum catalyst is a platinum complex of divinyltetramethyldisiloxane; the inhibitor is methyl butynol; and the viscosity enhancer is a compound of vinyltriethoxysilane and β-(3,4-epoxycyclohexane)ethyltrimethoxysilane in a mass ratio of 3:1.

[0111] A method for preparing a composite silicone rubber cloth with a light diffusion effect comprises the following steps:

[0112] S1. Weigh the raw materials of the silicone rubber layer with light diffusion effect, vinyl polydimethylsiloxane, reinforcing filler, light diffusing agent, hydrogen-containing silicone oil, platinum catalyst, inhibitor, and tackifier in parts by weight for later use;

[0113] S2. Vinyl polydimethylsiloxane, reinforcing filler and light diffusing agent are sequentially put into a planetary mixer, and deionized water is added (the amount of deionized water is 1.5 times the amount of vinyl polydimethylsiloxane). Under the condition of 110° C., the stirring speed is controlled to 800 r / min, and stirred for 2 h. Then, the temperature is raised to 160° C. and vacuumed for 2 h to obtain a silicone rubber base.

[0114] S3, after the silicone rubber base is cooled, hydrogen-containing silicone oil, inhibitor, platinum catalyst and tackifier are added in sequence, and stirring is continued for 0.5h under vacuum conditions to obtain silicone rubber raw materials;

[0115] S4. Use spin coating to coat the silicone rubber raw material on the release paper with a coating thickness of 1 mm, bake it in a tunnel oven at 140°C for 3 minutes to cure, attach the substrate layer to the cured silicone layer, and coat the silicone rubber raw material on the surface of the substrate layer with a coating thickness of 1 mm, then bake it in a tunnel oven at 140°C for 5 minutes to cure, peel off the release paper, and you will get the required composite silicone rubber cloth with light diffusion effect.

[0116] Comparative Example 4

[0117] Comparative Example 4 is different from Example 1 only in that only vinyl triethoxysilane is used as the tackifier, specifically as follows:

[0118] A composite silicone rubber cloth with light diffusion effect, comprising a substrate layer and silicone rubber layers with light diffusion effect coated on the upper and lower surfaces of the substrate layer, wherein the substrate layer is a glass fiber mesh cloth;

[0119] The silicone rubber layer with light diffusion effect comprises the following raw materials in parts by weight:

[0120]

[0121]

[0122] The reinforcing material is precipitated silica; the light diffuser is spherical silicone resin powder; the platinum catalyst is a platinum complex of divinyltetramethyldisiloxane; the inhibitor is methylbutynol; and the viscosity enhancer is vinyltriethoxysilane.

[0123] A method for preparing a composite silicone rubber cloth with a light diffusion effect comprises the following steps:

[0124] S1. Weigh the raw materials of the silicone rubber layer with light diffusion effect, vinyl polydimethylsiloxane, vinyl MQ silicone resin, silazane, reinforcing filler, light diffusing agent, hydrogen-containing silicone oil, platinum catalyst, inhibitor, and tackifier, by weight and set aside;

[0125] S2, vinyl polydimethylsiloxane, vinyl MQ silicone resin, reinforcing filler, light diffusing agent are put into a planetary mixer in sequence, silazane and deionized water (the amount of deionized water is 1.5 times the amount of vinyl polydimethylsiloxane) are added, the stirring speed is controlled to 800r / min at 110°C, stirring for 2h, and then the temperature is raised to 160°C, and vacuum is drawn for 2h to obtain a silicone rubber base;

[0126] S3, after the silicone rubber base is cooled, hydrogen-containing silicone oil, inhibitor, platinum catalyst and tackifier are added in sequence, and stirring is continued for 0.5h under vacuum conditions to obtain silicone rubber raw materials;

[0127] S4. Use spin coating to coat the silicone rubber raw material on the release paper with a coating thickness of 1 mm, bake it in a tunnel oven at 140°C for 3 minutes to cure, attach the substrate layer to the cured silicone layer, and coat the silicone rubber raw material on the surface of the substrate layer with a coating thickness of 1 mm, then bake it in a tunnel oven at 140°C for 5 minutes to cure, peel off the release paper, and you will get the required composite silicone rubber cloth with light diffusion effect.

[0128] Comparative Example 5

[0129] Comparative Example 5 is different from Example 1 only in that only β-(3,4-epoxycyclohexane)ethyltrimethoxysilane is used as the tackifier, specifically as follows:

[0130] A composite silicone rubber cloth with light diffusion effect, comprising a substrate layer and silicone rubber layers with light diffusion effect coated on the upper and lower surfaces of the substrate layer, wherein the substrate layer is a glass fiber mesh cloth;

[0131] The silicone rubber layer with light diffusion effect comprises the following raw materials in parts by weight:

[0132]

[0133] Among them, the reinforcing material is precipitated silica; the light diffuser is spherical silicone resin powder; the platinum catalyst is a platinum complex of divinyltetramethyldisiloxane; the inhibitor is methyl butynol; and the viscosity enhancer is β-(3,4-epoxycyclohexane)ethyltrimethoxysilane.

[0134] A method for preparing a composite silicone rubber cloth with a light diffusion effect comprises the following steps:

[0135] S1. Weigh the raw materials of the silicone rubber layer with light diffusion effect, vinyl polydimethylsiloxane, vinyl MQ silicone resin, silazane, reinforcing filler, light diffusing agent, hydrogen-containing silicone oil, platinum catalyst, inhibitor, and tackifier, by weight and set aside;

[0136] S2, vinyl polydimethylsiloxane, vinyl MQ silicone resin, reinforcing filler, light diffusing agent are put into a planetary mixer in sequence, silazane and deionized water (the amount of deionized water is 1.5 times the amount of vinyl polydimethylsiloxane) are added, the stirring speed is controlled to 800r / min at 110°C, stirring for 2h, and then the temperature is raised to 160°C, and vacuum is drawn for 2h to obtain a silicone rubber base;

[0137] S3, after the silicone rubber base is cooled, hydrogen-containing silicone oil, inhibitor, platinum catalyst and tackifier are added in sequence, and stirring is continued for 0.5h under vacuum conditions to obtain silicone rubber raw materials;

[0138] S4. Use spin coating to coat the silicone rubber raw material on the release paper with a coating thickness of 1 mm, bake it in a tunnel oven at 140°C for 3 minutes to cure, attach the substrate layer to the cured silicone layer, and coat the silicone rubber raw material on the surface of the substrate layer with a coating thickness of 1 mm, then bake it in a tunnel oven at 140°C for 5 minutes to cure, peel off the release paper, and you will get the required composite silicone rubber cloth with light diffusion effect.

[0139] Performance Testing

[0140] The comprehensive properties of the composite silicone rubber cloth with light diffusion effect in Examples 1-4 of the present invention and Comparative Examples 1-5 were tested respectively, as follows:

[0141] Tensile Strength:

[0142] The test is carried out in accordance with the national standard GB / T 528-2009 "Determination of tensile stress-strain properties of vulcanized rubber or thermoplastic rubber";

[0143] High temperature and high humidity resistance:

[0144] The composite silicone rubber was placed in an environment with a temperature of 150°C and a humidity of 85%, and after being placed for 500 hours, it was taken out and air-dried at room temperature, and then the tensile strength was measured again;

[0145] Transmittance and haze:

[0146] Refer to the national standard GB / T 2410-2008 "Determination of light transmittance and haze of transparent plastics" to measure the light transmittance and haze after high temperature and high humidity treatment;

[0147] The results are shown in Table 1 below.

[0148] Table 1:

[0149] Test samples Tensile strength / MPa High temperature and humidity resistance / MPa Light transmittance / % Haze / % Example 1 11.2 10.7 94.5 93.5 Example 2 13.8 13.3 96.2 95.7 Example 3 9.5 8.9 93.9 92.4 Example 4 12.3 11.8 95.7 94.1 Comparative Example 1 10.1 8.5 93.4 92.2 Comparative Example 2 9.8 7.7 88.9 85.7 Comparative Example 3 9.0 6.4 84.8 82.9 Comparative Example 4 10.4 8.9 92.8 92.1 Comparative Example 5 9.5 7.8 90.5 89.9

[0150] It can be seen from the data shown in Table 1 and Table 2 above that the comprehensive performance of the composite silicone rubber cloth with light diffusion effect in Examples 1-4 of the present invention is significantly better than that in Comparative Examples 1-5. The composite silicone rubber cloth with light diffusion effect prepared in the embodiments of the present invention can maintain excellent light diffusion effect while having high light transmittance, good environmental stability and excellent processing performance, and has broad application prospects.

[0151] This specific embodiment is merely an explanation of the present invention and is not a limitation of the present invention. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed. However, as long as they are within the scope of the claims of the present invention, they are protected by the patent law.

Claims

1. A composite silicone rubber cloth with light diffusion effect, characterized in that: It comprises a substrate layer and a silicone rubber layer with a light diffusion effect coated on the upper and lower surfaces of the substrate layer. The silicone rubber layer with a light diffusion effect comprises the following raw materials in parts by weight: 100 parts of vinyl dimethicone Vinyl MQ silicone resin 3-30 parts Silazane 1-5 parts Reinforcing filler 10-50 parts Light diffuser 1-20 parts 0.5-20 parts of hydrogen silicone oil Platinum catalyst 0.01-10 parts Inhibitor 0.01-5 parts 0.1-10 parts of tackifier; The tackifier is a compound of vinyl triethoxysilane and β-(3,4-epoxycyclohexane) ethyl trimethoxysilane in a mass ratio of 2-3:

1.

2. The composite silicone rubber cloth with light diffusion effect according to claim 1, characterized in that: The mass ratio of the vinyl polydimethylsiloxane, the vinyl MQ silicone resin and the silazane is 25:4-6:

1.

3. The composite silicone rubber cloth with light diffusion effect according to claim 1, characterized in that: The molecular chain of the vinyl polydimethylsiloxane contains at least two vinyl groups bonded to silicon and located at the chain end or side chain; the viscosity of the vinyl polydimethylsiloxane is in the range of 500-100000 cs, and the mass percentage of the vinyl group is 0.1%-5%.

4. The composite silicone rubber cloth with light diffusion effect according to claim 1, characterized in that: The mass percentage of vinyl in the vinyl MQ silicone resin is 0.2%-5%; the mass percentage of hydrogen in the hydrogen-containing silicone oil is 0.1%-1.2%.

5. The composite silicone rubber cloth with light diffusion effect according to claim 1, characterized in that: The reinforcing filler is fumed silica and / or precipitated silica; the light diffuser is at least one of spherical silica powder, spherical alumina powder, spherical silicone resin powder, spherical glass bead powder, spherical silicon carbide, and spherical silicon nitride.

6. The composite silicone rubber cloth with light diffusion effect according to claim 1, characterized in that: The platinum content of the platinum catalyst is 500-5000 ppm, and the platinum catalyst is selected from at least one of chloroplatinic acid, an alcohol solution of chloroplatinic acid, a platinum complex of divinyltetramethyldisiloxane, and a platinum complex of tetramethyltetravinylcyclotetrasiloxane.

7. The composite silicone rubber cloth with light diffusion effect according to claim 1, characterized in that: The inhibitor is at least one of methyl butynol, ethynyl cyclohexanol, polyvinyl siloxane polymer, amide compound and phosphorus-containing compound.

8. A method for preparing the composite silicone rubber cloth with light diffusion effect according to any one of claims 1 to 7, characterized in that: The following steps are involved: S1. Weigh the raw materials of the silicone rubber layer with light diffusion effect, vinyl polydimethylsiloxane, vinyl MQ silicone resin, silazane, reinforcing filler, light diffusing agent, hydrogen-containing silicone oil, platinum catalyst, inhibitor, and tackifier, by weight and set aside; S2, vinyl polydimethylsiloxane, vinyl MQ silicone resin, reinforcing filler, light diffusing agent are put into a planetary mixer in sequence, silazane and deionized water are added, stirred at 90-110° C. for 2-3 hours, then heated to 140-160° C., vacuumed for 2-3 hours, and a silicone rubber base is obtained; S3, after the silicone rubber base is cooled, hydrogen-containing silicone oil, inhibitor, platinum catalyst and tackifier are added in sequence, and stirred for 0.5-1h under vacuum conditions to obtain silicone rubber raw materials; S4, coating the silicone rubber raw material on the release paper, baking and curing, laminating the substrate layer on the silicone layer, and coating the silicone rubber raw material on the surface of the substrate layer, baking and curing again, and peeling off the release paper to obtain the desired composite silicone rubber cloth with light diffusion effect.

9. The method for preparing the composite silicone rubber cloth with light diffusion effect according to claim 8, characterized in that: The coating method in step S4 is one of a scraper method, a screen printing method, a spin coating method, a brush coating method, and a casting method.

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