Coating material and preparation method thereof

Abstract

The invention provides a coating material and a preparation method thereof. The coating material is prepared from the following components in parts by weight: 80 to 100 parts of alpha, omega-dihydroxy polysiloxane, 80 to 100 parts of special functional rubber, 30 to 100 parts of a reinforcing agent, 60 to 100 parts of a flame retardant, 30 to 50 parts of flame-retardant filler, 0.8 to 1 part of a catalyst and 0.5 to 0.8 part of a coupling agent. According to the coating material disclosed by the invention, the complex part needing to be protected can be coated in all directions by utilizing the soft and plastic characteristics of the coating material before the coating material is cured, and after the coating material is cured, insulation, waterproof and flame-retardant protection can be effectively carried out, so that the problem of electric power safety protection in a complex environment is better solved.

Description

Technical Field

[0001] The present invention belongs to the technical field of materials, and particularly relates to a coating material and a preparation method thereof. Background Art

[0002] Electric power, as an important and indispensable energy source in modern society, plays a crucial role in various industries. However, the use of electric power is also accompanied by various potential safety risks. Therefore, in the electric power industry, it is usually necessary to take effective protective measures for electric power facilities to carry out waterproof and insulation treatment to ensure the personal safety of the surrounding area and the stable operation of the electric power facilities themselves.

[0003] The existing traditional method is to use busbar heat shrinkable tubes, heat shrinkable boxes or tapes to protect electric power facilities. However, for electric power facilities in complex environments, especially complex joints and connections, the above methods are difficult to meet the current requirements of the electric power industry. The insulation range of busbar heat shrinkable tubes is limited, and it cannot provide comprehensive insulation and protection, and its protection ability against external mechanical impacts and environmental erosion is relatively weak. Compared with busbar heat shrinkable tubes, busbar heat shrinkable boxes can provide a higher level of protection, but their installation is relatively complex, the cost is relatively high, and the protection level is limited by the material properties used. Compared with busbar heat shrinkable tubes and heat shrinkable boxes, tapes have certain advantages, but their operation is cumbersome, time-consuming, and it is necessary to wind them in circles with a 1 / 2 lap, and the consumption is large and the cost is high. Therefore, there is an urgent need for an electric power protection material that can be used in complex electric power environments and is easy to operate at the same time. Summary of the Invention

[0004] In view of all or part of the deficiencies of the above-mentioned prior art, the purpose of the present invention is to provide a coating material and a preparation method thereof. Before curing, the coating material can use its soft and plastic characteristics to fully cover complex parts to be protected. When the coating material cures, it can further absorb the moisture on the surface of the covered part to keep the inside dry. After curing, the coating material can effectively provide insulation and waterproof protection. By using this coating material, the electric power protection requirements in different complex environments can be met.

[0005] To achieve the above invention purpose, the present invention provides the following technical solutions:

[0006] A coating material, characterized in that the coating material comprises the following components in parts by weight: 80-100 parts of α,ω-dihydroxypolysiloxane, 80-100 parts of special functional rubber, 30-100 parts of reinforcing agent, 60-100 parts of flame retardant, 30-50 parts of flame retardant filler, 0.8-1 part of catalyst, and 0.5-0.8 part of coupling agent. The coating material in this application uses special functional rubber as the base material. The α,ω-dihydroxypolysiloxane therein cures with water vapor in the air under the action of a catalyst and a coupling agent, improving the performance of the material. The addition of the reinforcing agent increases the physical stability of the coating material, and the addition of the flame retardant filler and the flame retardant better achieves the effects of flame retardancy and fire prevention. Through the combination of the above several raw materials, the relevant power facilities can be better protected.

[0007] The α,ω-dihydroxypolysiloxane is prepared by compounding two or three kinds of low-viscosity α,ω-dihydroxypolysiloxanes with a viscosity range of

[0008] 1500-100000 mPa·s and high-viscosity α,ω-dihydroxypolysiloxanes with a viscosity range of 500000-1000000 mPa·s.

[0009] The compounding method of the α,ω-dihydroxypolysiloxane is to compound 30-35% of low-viscosity α,ω-dihydroxypolysiloxane and 65-70% of high-viscosity α,ω-dihydroxypolysiloxane; compound 20-25% and 10-20% of low-viscosity α,ω-dihydroxypolysiloxanes with different viscosities with 55-70% of high-viscosity α,ω-dihydroxypolysiloxane. By using α,ω-dihydroxypolysiloxanes with different viscosity ranges, the physical properties of the coating material can be optimized.

[0010] The special functional rubber is any one or a combination of chloroprene rubber, cis-butadiene rubber, butyl rubber, chlorinated butyl rubber, nitrile rubber, styrene-butadiene rubber, poly-latex styrene-butadiene rubber, solution-polymerized styrene-butadiene rubber, high-cis butadiene rubber, ethylene-propylene-diene monomer rubber, fluororubber, polysulfide rubber, polyacrylate rubber, polyurethane rubber, polyester-type polyurethane rubber, polyester rubber, acrylate rubber, chlorosulfonated polyethylene rubber, chlorinated polyethylene rubber. The special functional rubber has good flexibility and can effectively protect the position to be protected as the base material.

[0011] According to a coating material as claimed in claim 1, characterized in that the reinforcing agent is any one or a combination of fumed silica, diatomaceous earth, calcium carbonate. In this application, by adjusting the parts by weight of the reinforcing agent, the tensile strength and elongation at break of the final coating material can be adjusted, and thus the required coating material can be obtained.

[0012] The flame retardant is a combination of decabromodiphenyl ether and antimony trioxide, and the percentage ratio of decabromodiphenyl ether to antimony trioxide is 72%-78% and 22%-28%. The flame retardant in this application has an obvious synergistic flame retardant effect through the combination of decabromodiphenyl ether and antimony trioxide, and the flame retardant effect is better.

[0013] The flame retardant filler is composed of any one or a combination of ceramic powder, expanded carbon black, aluminum hydroxide, magnesium hydroxide, and glass fiber. Some of the flame retardant fillers in this application, such as aluminum hydroxide and magnesium hydroxide, will release moisture to reduce the fire source temperature when exposed to high temperature, thereby extinguishing the fire and improving the fire resistance of the material.

[0014] The catalyst is composed of one or a combination of titanate compounds, dibutyltin diacetate, ND-43, N-(2-aminoethyl)-3-aminopropyltriethoxysilane, and dibutyltin dilaurate. The coupling agent is composed of any one or a combination of dioctyl pyrophosphate acyloxy and diisopropyl titanate bis(triethylamine). The catalyst and coupling agent in this application are mainly used to assist the curing of α,ω-dihydroxypolysiloxane when placed in the air. Different added weight parts have a certain influence on the curing time.

[0015] A preparation method of a coating material uses the raw materials of the coating material as described above. The preparation method includes the following steps:

[0016] Step 1: Put 80-100 parts of special functional rubber into an internal mixer, control the temperature below 70°C, and after kneading for 20 minutes, add 20-30 parts of flame retardant filler and 40-60 parts of flame retardant, and mix evenly to knead out the functional rubber.

[0017] Step 2: Take 80-100 parts of α,ω-dihydroxypolysiloxane, add 30-100 parts of reinforcing agent, place it in a kneader, control the temperature at 70°C-110°C, mix evenly, then add 10-20 parts of flame retardant filler and 20-40 parts of flame retardant, continue to knead and mix evenly, add the functional rubber completed in Step 1, turn on the vacuum equipment, and continue to knead. After 15-30 minutes, obtain the mixed rubber compound.

[0018] Step 3: Take 100 parts of the mixed rubber compound in Step 2 and place it in another kneader for kneading and softening. When the temperature of the rubber compound reaches 50°C-70°C, add 0.8-1 part of catalyst and 0.5-0.8 part of coupling agent, and continue to carry out vacuum kneading. After 5-10 minutes, take out the final mixed rubber compound.

[0019] Step 4: Extrude the final mixed rubber compound in Step 3 using an extruder to obtain the coating material.

[0020] Compared with the prior art, the present invention has at least the following beneficial effects:

[0021] Due to the softness and plasticity before curing, the coating material of the present invention can be applied to different complex power environments, solves the problem of no effective safety protection for complex connection and corner connection parts, can comprehensively coat the parts to be protected, reduces the safety risk, and has good insulation and waterproof effects. Moreover, the water absorption property during the curing of the material can further absorb the moisture on the surface of the wrapped object and keep the inside dry. After a fire source appears, the fire-proof components in the material will quickly carbonize and form a crust to prevent the spread of the flame, and release a certain amount of water to reduce the combustion temperature, which can play an excellent flame-retardant role. Specific Embodiments

[0022] The technical solutions in the specific embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts fall within the scope of protection of the present invention.

[0023] Example 1

[0024] A coating material includes 80 parts of α,ω-dihydroxypolysiloxane, 80 parts of special functional rubber, 70 parts of reinforcing agent, 60 parts of flame retardant, 30 parts of flame retardant filler, 0.8 part of catalyst, and 0.6 part of coupling agent.

[0025] The α,ω-dihydroxypolysiloxane is composed of α,ω-dihydroxypolysiloxane with two viscosities of 40000 mPa·s and 600000 mPa·s. The special functional rubber is selected as ethylene propylene diene monomer rubber. The reinforcing agent is composed of 60 parts of fumed silica and 10 parts of calcium carbonate. The flame retardant is composed of 40 parts of decabromodiphenyl ether and 20 parts of antimony trioxide. The flame retardant filler is selected as magnesium hydroxide. The catalyst is composed of 0.4 part of dibutyltin diacetate and 0.4 part of dibutyltin dilaurate. The coupling agent is selected as diisopropyl titanate bis(triethylamine).

[0026] The preparation method of the coating material includes the following steps:

[0027] Step 1: Place 80 parts of ethylene propylene diene monomer rubber in an internal mixer, control the temperature below 70°C, and after kneading for 20 min, add 40 parts of decabromodiphenyl ether, 20 parts of antimony trioxide, and 20 parts of magnesium hydroxide, and mix evenly to knead out the functional rubber.

[0028] Step 2: Take 80 parts of α,ω-dihydroxypolysiloxane, 60 parts of fumed silica and 10 parts of calcium carbonate and place them in a kneader. Control the temperature at 80°C and mix them evenly. Then add 15 parts of decabromodiphenyl ether, 5 parts of antimony trioxide and 10 parts of magnesium hydroxide. After continuing to knead and mix evenly, add the functional rubber completed in Step 1. Turn on the vacuum equipment and continue to knead. After 20 minutes, a mixed rubber compound is obtained.

[0029] Step 3: Take 100 parts of the mixed rubber compound in Step 2 and place it in another kneader for kneading and softening. When the temperature of the rubber compound reaches 60°C, add 0.4 parts of dibutyltin diacetate and dibutyltin dilaurate each, and 0.6 parts of diisopropyl titanate bis(triethylamine). Continue to carry out vacuum kneading. After 10 minutes, take out the final mixed rubber compound.

[0030] Step 4: Place the final mixed rubber compound in Step 3 in an extruder for extrusion production to obtain the coating material.

[0031] Example 2

[0032] A coating material includes 90 parts of α,ω-dihydroxypolysiloxane, 90 parts of special functional rubber, 85 parts of reinforcing agent, 80 parts of flame retardant, 40 parts of flame retardant filler, 0.8 parts of catalyst and 0.8 parts of coupling agent.

[0033] The α,ω-dihydroxypolysiloxane is composed of α,ω-dihydroxypolysiloxane with two viscosities of 80000 mPa·s and 800000 mPa·s. The special functional rubber is composed of 45 parts of chloroprene rubber and 45 parts of butyl rubber. The reinforcing agent is composed of 70 parts of fumed silica and 15 parts of diatomite. The flame retardant is composed of 50 parts of decabromodiphenyl ether and 30 parts of antimony trioxide. The flame retardant filler is composed of 15 parts of expanded carbon black and 25 parts of aluminum hydroxide. The catalyst is selected from titanate compounds, and the coupling agent is selected from dioctyl pyrophosphate acyloxy.

[0034] The preparation method of the coating material includes the following steps:

[0035] Step 1: Place 45 parts of chloroprene rubber and 45 parts of butyl rubber in an internal mixer. Control the temperature below 70°C. After kneading for 20 minutes, add 30 parts of decabromodiphenyl ether, 20 parts of antimony trioxide, 10 parts of expanded carbon black and 15 parts of aluminum hydroxide, and carry out uniform mixing to knead out the functional rubber.

[0036] Step 2: Take 90 parts of α,ω-dihydroxypolysiloxane, 70 parts of fumed silica and 15 parts of diatomite and place them in a kneader. Control the temperature at 80°C and mix thoroughly. Then add 20 parts of decabromodiphenyl ether, 10 parts of antimony trioxide, 5 parts of expanded carbon black and 10 parts of aluminum hydroxide. After continuing to knead and mix evenly, add the functional rubber completed in Step 1. Turn on the vacuum equipment and continue kneading. After 20 minutes, a mixed rubber compound is obtained.

[0037] Step 3: Take 100 parts of the mixed rubber compound in Step 2 and place it in another kneader for kneading and softening. When the temperature of the rubber compound reaches 60°C, add 0.8 part of titanate compound and 0.8 part of dioctylpyrophosphate acyloxy. Continue to perform vacuum kneading. After 10 minutes, take out the final mixed rubber compound.

[0038] Step 4: Place the final mixed rubber compound in Step 3 in an extruder for extrusion production to obtain the coating material.

[0039] Example 3

[0040] A coating material includes 100 parts of α,ω-dihydroxypolysiloxane, 100 parts of special functional rubber, 100 parts of reinforcing agent, 100 parts of flame retardant, 50 parts of flame retardant filler, 1 part of catalyst and 0.8 part of coupling agent.

[0041] The α,ω-dihydroxypolysiloxane is composed of α,ω-dihydroxypolysiloxane with two viscosities of 100,000 mPa·s and 900,000 mPa·s. The special functional rubber is composed of 50 parts of fumed silica and 50 parts of ethylene propylene diene monomer rubber. The reinforcing agent is composed of 80 parts of fumed silica and 20 parts of diatomite. The flame retardant is composed of 65 parts of decabromodiphenyl ether and 35 parts of antimony trioxide. The flame retardant filler is composed of 20 parts of expanded carbon black and 30 parts of magnesium hydroxide. The catalyst is selected as titanate compound, and the coupling agent is selected as dioctylpyrophosphate acyloxy.

[0042] The preparation method of the coating material includes the following steps:

[0043] Step 1: Place 50 parts of butyl rubber and 50 parts of ethylene propylene diene monomer rubber in an internal mixer. Control the temperature below 70°C. After internal mixing for 20 minutes, add 40 parts of decabromodiphenyl ether, 20 parts of antimony trioxide, 12 parts of expanded carbon black and 18 parts of magnesium hydroxide, and mix evenly to internally mix out the functional rubber.

[0044] Step 2: Take 100 parts of α,ω-dihydroxypolysiloxane, 80 parts of fumed silica and 20 parts of diatomite and place them in a kneader. Control the temperature at 80°C and mix thoroughly. Then add 25 parts of decabromodiphenyl ether, 15 parts of antimony trioxide, 8 parts of expanded carbon black and 12 parts of magnesium hydroxide. After continuing to knead and mix evenly, add the functional rubber compound completed in Step 1. Turn on the vacuum equipment and continue kneading. After 20 minutes, a mixed rubber compound is obtained.

[0045] Step 3: Take 100 parts of the mixed rubber compound in Step 2 and place it in another kneader for kneading and softening. When the temperature of the rubber compound reaches 60°C, add 1 part of titanate compound and 0.8 part of dioctyl pyrophosphate acyloxy. Continue to perform vacuum kneading. After 10 minutes, take out the final mixed rubber compound.

[0046] Step 4: Extrude the final mixed rubber compound in Step 3 using an extruder to obtain the coated material. The above embodiments only represent several implementation manners of the present invention. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention patent shall be subject to the appended claims.

Claims

1. A coating material, characterized in that, the coating material comprises the following components in parts by weight: 80 - 100 parts of α,ω-dihydroxypolysiloxane, 80 - 100 parts of special functional rubber, 30 - 100 parts of reinforcing agent, 60 - 100 parts of flame retardant, 30 - 50 parts of flame retardant filler, 0.8 - 1 part of catalyst, and 0.5 - 0.8 part of coupling agent.

2. The coating material according to claim 1, characterized in that, the α,ω-dihydroxypolysiloxane is compounded by taking two or three kinds of low-viscosity α,ω-dihydroxypolysiloxanes with a viscosity range of 1500 - 100000 mPa·s and high-viscosity α,ω-dihydroxypolysiloxanes with a viscosity range of 500000 - 1000000 mPa·s.

3. The coating material according to claim 2, characterized in that, the compounding method of the α,ω-dihydroxypolysiloxane is to compound 30% - 35% of low-viscosity α,ω-dihydroxypolysiloxane and 65% - 70% of high-viscosity α,ω-dihydroxypolysiloxane; or to compound 20% - 25% and 10% - 20% of low-viscosity α,ω-dihydroxypolysiloxanes with different viscosities and 55% - 70% of high-viscosity α,ω-dihydroxypolysiloxane.

4. The coating material according to claim 1, characterized in that, the special functional rubber is any one or a combination of chloroprene rubber, cis-butadiene rubber, butyl rubber, chlorinated butyl rubber, nitrile rubber, styrene-butadiene rubber, poly-latex styrene-butadiene rubber, solution-polymerized styrene-butadiene rubber, high-cis butadiene rubber, ethylene-propylene-diene monomer rubber, fluororubber, polysulfide rubber, polyacrylate rubber, polyurethane rubber, polyester-type polyurethane rubber, polyester rubber, acrylate rubber, chlorosulfonated polyethylene rubber, chlorinated polyethylene rubber.

5. The coating material according to claim 1, characterized in that, the reinforcing agent is any one or a combination of fumed silica, diatomaceous earth, calcium carbonate.

6. The coating material according to claim 1, characterized in that, the flame retardant is a combination of decabromodiphenyl ether and antimony trioxide, and the percentage ratio of decabromodiphenyl ether and antimony trioxide is 72% - 78%, 22% - 28%.

7. The coating material according to claim 1, characterized in that, the flame retardant filler is any one or a combination of ceramic powder, expanded carbon black, aluminum hydroxide, magnesium hydroxide, glass fiber.

8. The coating material according to claim 1, characterized in that, the catalyst is any one or a combination of titanate compounds, dibutyltin diacetate, ND-43, N-(2-aminoethyl)-3-aminopropyltriethoxysilane, dibutyltin dilaurate.

9. The coating material according to claim 1, characterized in that, the coupling agent is any one or a combination of dioctyl pyrophosphate acyloxy, bis(triethylamine)titanium diisopropoxide.

10. A preparation method of a coating material, characterized in that: using the coating material raw materials described in any one of claims 1 - 9, the preparation method comprises the following steps: Step 1: Take 80 - 100 parts of special functional rubber and place it in an internal mixer. Control the temperature below 70°C. After kneading for 20 minutes, add 20 - 30 parts of flame retardant filler and 40 - 60 parts of flame retardant, and mix evenly to knead out the functional rubber. Step 2: Take 80 - 100 parts of α,ω-dihydroxypolysiloxane, add 30 - 100 parts of reinforcing agent, and place it in a kneader. Control the temperature at 70°C - 110°C and mix thoroughly. Then add 10 - 20 parts of flame retardant filler and 20 - 40 parts of flame retardant, continue to knead and mix evenly. After that, add the functional rubber completed in Step 1, turn on the vacuum equipment, and continue to knead. After 15 - 30 minutes, obtain the mixed rubber compound. Step 3: Take 100 parts of the mixed rubber compound obtained in Step 2 and place it in another kneader for kneading and softening. When the temperature of the rubber compound reaches 50°C - 70°C, add 0.8 - 1 part of catalyst and 0.5 - 0.8 part of coupling agent, and continue to carry out vacuum kneading. After 5 - 10 minutes, take out the final mixed rubber compound. Step 4: Place the final mixed rubber compound obtained in Step 3 in an extruder for extrusion production to obtain the coated material.