阅读说明：本技术 一种改性硅橡胶陶瓷化云母耐火复合带的制备方法 (Preparation method of modified silicon rubber ceramic mica fireproof composite belt ) 是由 冷冰冰 朱春卉 张宏岩 刘洋 王志鹏 陈伯东 郭占滨 耿巍 于 2021-09-27 设计创作，主要内容包括：本发明涉及绝缘材料技术领域,具体公开了一种改性硅橡胶陶瓷化云母耐火复合带的制备方法,包括以下步骤：准备原材料,在云母层的两面均匀涂布耐高温粘结剂,然后送入烘干箱烘干；在高分子薄膜的正面均匀涂布耐高温粘结剂,然后送入烘干箱中烘干,将烘干后高分子薄膜的正面与云母层的反面进行复合；在高分子薄膜的反面均匀涂布耐高温粘结剂,然后送入烘干箱中烘干,将烘干后高分子薄膜的反面与改性陶瓷化硅橡胶层进行复合。本发明克服了现有技术的不足,在云母层上粘接改性陶瓷化硅橡胶层,在高温的情况下,改性陶瓷化硅橡胶层与云母层结合成为一种熔融致密状态,达到高效隔水隔热防止短路的效果。(The invention relates to the technical field of insulating materials, and particularly discloses a preparation method of a modified silicon rubber ceramization mica fireproof composite belt, which comprises the following steps: preparing raw materials, uniformly coating high-temperature-resistant binders on two surfaces of a mica layer, and then sending the mica layer into a drying box for drying; uniformly coating a high-temperature-resistant binder on the front side of the high-molecular film, then sending the high-molecular film into a drying box for drying, and compounding the front side of the dried high-molecular film with the back side of the mica layer; and (3) uniformly coating a high-temperature-resistant binder on the reverse side of the high-molecular film, then sending the high-molecular film into a drying box for drying, and compounding the reverse side of the dried high-molecular film with the modified ceramic silicon rubber layer. The invention overcomes the defects of the prior art, the modified ceramic silicon rubber layer is bonded on the mica layer, and the modified ceramic silicon rubber layer and the mica layer are combined into a molten compact state under the condition of high temperature, thereby achieving the effects of high efficiency, water resistance, heat insulation and short circuit prevention.)

1. A preparation method of a modified silicon rubber ceramization mica fireproof composite belt is characterized by comprising the following steps: the method comprises the following steps:

step one, preparing raw materials: the raw materials comprise a mica layer, a modified ceramic silicon rubber layer, a high-molecular film, a silicon rubber self-adhesive layer and a high-temperature-resistant binder;

step two, uniformly coating a high-temperature-resistant binder on the front side of the mica layer, then sending the mica layer into a drying box to be dried for 10-20min at the temperature of 80-120 ℃, then uniformly coating the high-temperature-resistant binder on the back side of the mica layer, and continuously sending the mica layer into the drying box to be dried for 2-6min at the temperature of 80-120 ℃;

step three, uniformly coating a high-temperature-resistant binder on the front side of the high-molecular film, then sending the high-molecular film into a drying box for drying for 2-6min at the temperature of 80-120 ℃, and compounding the front side of the dried high-molecular film with the back side of the mica layer;

and step four, uniformly coating a high-temperature-resistant adhesive on the reverse side of the high-molecular film, then sending the high-molecular film into a drying box to be dried for 2-6min at the temperature of 80-120 ℃, and compounding the reverse side of the dried high-molecular film with the modified ceramic silicon rubber layer to obtain the fire-resistant composite belt.

2. The preparation method of the modified silicone rubber ceramization mica fire-resistant composite belt according to claim 1, characterized in that: the mica layer is phlogopite, synthetic mica or calcined mica, and the high polymer film is a modified low-density polyethylene film.

3. The preparation method of the modified silicone rubber ceramization mica fire-resistant composite belt according to claim 1, characterized in that: the modified ceramic silicon rubber layer is prepared from the following raw materials in parts by weight: 10-16 parts of nitrile rubber, 50-80 parts of silicone rubber, 20-30 parts of low-density polyethylene, 10-20 parts of modified glass powder, 1-3 parts of vulcanizing agent, 2-4 parts of foaming agent and 15-20 parts of nano particles.

4. The preparation method of the modified silicone rubber ceramization mica fire-resistant composite belt according to claim 3, characterized in that: the nano particles comprise ZnO and RuO₂、α-Fe₂O₃、γ-Fe₂O₃、WO₃、SnO₂One or more of a group of substances consisting of conductive carbon black, nano silver powder, nano graphite micro-sheets and nano graphite powder.

5. The method for preparing the modified silicone rubber ceramicized mica fire-resistant composite tape according to claims 3 to 4, wherein: the specific preparation method of the modified ceramic silicon rubber layer comprises the following steps:

(1) weighing the raw materials in parts by weight in sequence;

(2) firstly, banburying nitrile rubber, silicone rubber and low-density polyethylene, then adding a vulcanizing agent, modified glass powder, nano particles and a foaming agent, mixing, molding into sheets, cold pressing, and irradiating the product to obtain the modified ceramic silicone rubber layer.

6. The preparation method of the modified silicone rubber ceramization mica fire-resistant composite belt according to claim 1, characterized in that: the silicon rubber self-adhesive layer is prepared from the following raw materials in parts by weight: 100 parts of methyl vinyl silicone rubber, 2-6 parts of hydroxyl silicone oil, 20-40 parts of fumed silica, 10-15 parts of vulcanizing agent, 4-20 parts of boron-containing tackifier, 20-60 parts of aluminum hydroxide and 2-10 parts of silicon micropowder.

7. The preparation method of the modified silicone rubber ceramization mica fire-resistant composite belt according to claim 6, wherein the preparation method comprises the following steps: the preparation method of the silicon rubber self-adhesive layer comprises the following steps: sequentially adding methyl vinyl silicone rubber, fumed silica, hydroxyl silicone oil, aluminum hydroxide and silicon micropowder into a kneading machine according to the formula, heating to 150 ℃ and 160 ℃ after materials are completely mixed, keeping the temperature constant and vacuumizing for 2-3h, discharging, cooling to room temperature, adding a certain amount of boron-containing tackifier and vulcanizing agent on an open rubber mixing mill, uniformly mixing, discharging, splitting, extruding by an extruder, and vulcanizing to form the silicone rubber self-adhesive layer.

8. The preparation method of the modified silicone rubber ceramization mica fire-resistant composite belt according to claim 1, characterized in that: the high-temperature-resistant binder is prepared from the following raw materials in parts by weight: 1-2 parts of epoxy resin, 0.6-1.2 parts of reactive diluent, 0.2-0.6 part of cobalt glass powder, 1-1.5 parts of sodium silicate, 10-20 parts of diluent and 1-5 parts of curing agent.

Technical Field

The invention relates to the technical field of insulating materials, and particularly belongs to a preparation method of a modified silicon rubber ceramization mica fireproof composite belt.

Background

The mica composite tape is mainly used for being wound on the surface of a conductor and outside an insulator to play a fire-resistant function, and the traditional mica composite tape has poor flexibility, low strength and insignificant moisture-proof effect and can cause short circuit or damage of an inner conductor.

The ceramization silicone rubber is a hard ceramic-like object formed after burning under the condition of high temperature, and the ceramization process of the silicone rubber is a process of continuously curing and binding combustion products of the silicone rubber, so that dispersed, loose and discontinuous inorganic small particles are tightly combined together. Since the mechanism of formation and the final product are ceramic-like, they are visually referred to as cerammed silicone rubber.

The ceramic silicon rubber is nontoxic and tasteless at normal temperature, has good flexibility and elasticity, excellent moisture resistance and water absorption resistance, has the characteristics of silicon rubber, and can be sintered into a hard ceramic armor shell insulating layer after being burned for 2-4min under the ablation of flame, and the insulating layer can effectively prevent the flame from continuing to burn; and completely cutting off smoke when the glass is burnt for about 2min, and no smoke is generated in the following ablation process; the ceramic armored shell has excellent insulativity, heat insulation and fire resistance, can bear impact and vibration and prevent water from permeating.

Based on the performance of the mica composite tape and the ceramic silicon rubber, the mica composite tape with excellent high-temperature resistance, moisture resistance, fire resistance and flame retardance is prepared.

Disclosure of Invention

The invention aims to provide a preparation method of a modified silicon rubber ceramic mica fireproof composite tape, which overcomes the defects of the prior art, the modified ceramic silicon rubber layer is bonded on the mica layer, and the modified ceramic silicon rubber layer and the mica layer are combined into a fused compact state under the condition of high temperature, so that the effects of high efficiency, water resistance, heat insulation and short circuit prevention are achieved.

In order to solve the problems, the technical scheme adopted by the invention is as follows:

a preparation method of a modified silicon rubber ceramization mica fireproof composite belt comprises the following steps:

step one, preparing raw materials: the raw materials comprise a mica layer, a modified ceramic silicon rubber layer, a high-molecular film, a silicon rubber self-adhesive layer and a high-temperature-resistant binder;

step two, uniformly coating a high-temperature-resistant binder on the front side of the mica layer, then sending the mica layer into a drying box to be dried for 10-20min at the temperature of 80-120 ℃, then uniformly coating the high-temperature-resistant binder on the back side of the mica layer, and continuously sending the mica layer into the drying box to be dried for 2-6min at the temperature of 80-120 ℃;

step three, uniformly coating a high-temperature-resistant binder on the front side of the high-molecular film, then sending the high-molecular film into a drying box for drying for 2-6min at the temperature of 80-120 ℃, and compounding the front side of the dried high-molecular film with the back side of the mica layer;

and step four, uniformly coating a high-temperature-resistant adhesive on the reverse side of the high-molecular film, then sending the high-molecular film into a drying box to be dried for 2-6min at the temperature of 80-120 ℃, and compounding the reverse side of the dried high-molecular film with the modified ceramic silicon rubber layer to obtain the fire-resistant composite belt.

Further, the mica layer is phlogopite, synthetic mica or calcined mica, and the high polymer film is a modified low-density polyethylene film.

Further, the modified ceramic silicon rubber layer is prepared from the following raw materials in parts by weight: 10-16 parts of nitrile rubber, 50-80 parts of silicone rubber, 20-30 parts of low-density polyethylene, 10-20 parts of modified glass powder, 1-3 parts of vulcanizing agent, 2-4 parts of foaming agent and 15-20 parts of nano particles.

Further, the nano-particles comprise ZnO and RuO₂、α-Fe₂O₃、γ-Fe₂O₃、WO₃、SnO₂One or more of a group of substances consisting of conductive carbon black, nano silver powder, nano graphite micro-sheets and nano graphite powder.

Further, the specific preparation method of the modified ceramic silicon rubber layer comprises the following steps:

(1) weighing the raw materials in parts by weight in sequence;

(2) firstly, banburying nitrile rubber, silicone rubber and low-density polyethylene, then adding a vulcanizing agent, modified glass powder, nano particles and a foaming agent, mixing, molding into sheets, cold pressing, and irradiating the product to obtain the modified ceramic silicone rubber layer.

Further, the silicon rubber self-adhesive layer is prepared from the following raw materials in parts by weight: 100 parts of methyl vinyl silicone rubber, 2-6 parts of hydroxyl silicone oil, 20-40 parts of fumed silica, 10-15 parts of vulcanizing agent, 4-20 parts of boron-containing tackifier, 20-60 parts of aluminum hydroxide and 2-10 parts of silicon micropowder.

Further, the preparation method of the silicon rubber self-adhesive layer comprises the following steps: sequentially adding methyl vinyl silicone rubber, fumed silica, hydroxyl silicone oil, aluminum hydroxide and silicon micropowder into a kneading machine according to the formula, heating to 150 ℃ and 160 ℃ after materials are completely mixed, keeping the temperature constant and vacuumizing for 2-3h, discharging, cooling to room temperature, adding a certain amount of boron-containing tackifier and vulcanizing agent on an open rubber mixing mill, uniformly mixing, discharging, splitting, extruding by an extruder, and vulcanizing to form the silicone rubber self-adhesive layer.

Further, the high-temperature-resistant binder is prepared from the following raw materials in parts by weight: 1-2 parts of epoxy resin, 0.6-1.2 parts of reactive diluent, 0.2-0.6 part of cobalt glass powder, 1-1.5 parts of sodium silicate, 10-20 parts of diluent and 1-5 parts of curing agent.

Compared with the prior art, the invention has the following implementation effects:

1. according to the invention, the modified ceramic silicon rubber layer is bonded on the mica layer, and the modified ceramic silicon rubber layer and the mica layer are combined into a molten compact state at high temperature, so that the effects of high efficiency, water resistance, heat insulation and short circuit prevention are achieved.

2. According to the invention, the high-temperature-resistant binder is coated on both sides of the mica layer, so that mica dust cannot fall off from mica tapes in the production and use processes, and the production environment is protected.

3. The invention adopts the polymer film, has the advantages of light weight, small volume and high tensile strength, is convenient for carrying operation and reduces the labor intensity of workers.

Detailed Description

The present invention will be further described with reference to the following examples, but the present invention is not limited to these examples, and any modification is within the scope of the present invention without departing from the spirit of the present invention.

Example 1

The embodiment discloses a preparation method of a modified silicon rubber ceramization mica fireproof composite belt, which comprises the following steps:

weighing 10-16 parts of nitrile rubber, 50-80 parts of silicon rubber, 20 parts of low-density polyethylene, 10 parts of modified glass powder, 1 part of vulcanizing agent, 2 parts of foaming agent and 15 parts of nano particles in sequence according to parts by weight; firstly, banburying nitrile rubber, silicone rubber and low-density polyethylene, then adding a vulcanizing agent, modified glass powder, nano particles and a foaming agent, mixing, molding into sheets, cold pressing, and irradiating the product to obtain the modified ceramic silicone rubber layer.

Wherein the nanoparticles comprise ZnO and RuO₂、α-Fe₂O₃、γ-Fe₂O₃、WO₃、SnO₂One or more of a group of substances consisting of conductive carbon black, nano silver powder, nano graphite micro-sheets and nano graphite powder; ZnO nanoparticles of 40-65nm or 70-95nm, RuO₂The particle diameter of the nano particles is 20-70nm, alpha-Fe₂O₃And gamma-Fe₂O₃The particle diameter of the nano-particles is 40-80nm, WO₃The particle diameter of the nano particles is 30-70nm, SnO₂The particle size of the particles is 30-65nm, the particle size of the conductive carbon black is 15-65nm, the particle size of the nano silver powder is 10-65nm, and the particle size of the nano graphite powder is 15-75 nm.

And step two, sequentially adding 100 parts of methyl vinyl silicone rubber, 20 parts of fumed silica, 2 parts of hydroxyl silicone oil, 20 parts of aluminum hydroxide and 2 parts of silicon micropowder into a kneading machine according to the formula, heating to 150 ℃ and 160 ℃ after materials are completely mixed, keeping the temperature constant, vacuumizing for 2-3h, discharging, cooling to room temperature, adding 4 parts of boron-containing tackifier and 10 parts of vulcanizing agent into an open rubber mixing machine, uniformly mixing, discharging, splitting, extruding by an extruder, and vulcanizing to obtain the silicon rubber self-adhesive layer.

And step three, uniformly coating a high-temperature-resistant binder on the front side of the mica layer, then sending the mica layer into a drying box to be dried for 10-20min at the temperature of 80-120 ℃, then uniformly coating the high-temperature-resistant binder on the back side of the mica layer, and continuously sending the mica layer into the drying box to be dried for 2-6min at the temperature of 80-120 ℃.

And step four, uniformly coating a high-temperature-resistant binder on the front side of the high-molecular film, then sending the high-molecular film into a drying box for drying at the temperature of 80-120 ℃ for 2-6min, and compounding the front side of the dried high-molecular film and the back side of the mica layer.

And step five, uniformly coating a high-temperature-resistant adhesive on the reverse side of the high-molecular film, then sending the high-molecular film into a drying box to be dried for 2-6min at the temperature of 80-120 ℃, and compounding the reverse side of the dried high-molecular film with the modified ceramic silicon rubber layer to obtain the fire-resistant composite belt.

Wherein, the mica layer adopts phlogopite, synthetic mica or calcined mica, and the high molecular film adopts a modified low-density polyethylene film; the high-temperature resistant binder is prepared from the following raw materials in parts by weight: 1 part of epoxy resin, 0.6 part of reactive diluent, 0.2 part of cobalt glass powder, 1 part of sodium silicate, 10 parts of diluent and 1 part of curing agent.

Example 2

The preparation method of this example is substantially the same as that of example 1, except that: the modified ceramic silicon rubber layer is prepared from the following raw materials in parts by weight: 13 parts of nitrile rubber, 65 parts of silicon rubber, 25 parts of low-density polyethylene, 15 parts of modified glass powder, 2 parts of vulcanizing agent, 3 parts of foaming agent and 17.5 parts of nano particles.

Example 3

The preparation method of this example is substantially the same as that of example 1, except that: the modified ceramic silicon rubber layer is prepared from the following raw materials in parts by weight: 16 parts of nitrile rubber, 80 parts of silicon rubber, 30 parts of low-density polyethylene, 20 parts of modified glass powder, 3 parts of vulcanizing agent, 4 parts of foaming agent and 20 parts of nano particles.

Example 4

The preparation method of this example is substantially the same as that of example 1, except that: the silicon rubber self-adhesive layer is prepared from the following raw materials in parts by weight: 100 parts of methyl vinyl silicone rubber, 4 parts of hydroxyl silicone oil, 30 parts of fumed silica, 12.5 parts of a vulcanizing agent, 12 parts of a boron-containing tackifier, 40 parts of aluminum hydroxide and 6 parts of silicon micropowder.

Example 5

The preparation method of this example is substantially the same as that of example 1, except that: the silicon rubber self-adhesive layer is prepared from the following raw materials in parts by weight: 100 parts of methyl vinyl silicone rubber, 4 parts of hydroxyl silicone oil, 30 parts of fumed silica, 12.5 parts of a vulcanizing agent, 12 parts of a boron-containing tackifier, 40 parts of aluminum hydroxide and 6 parts of silicon micropowder.

Comparative example 1

The comparative example was prepared in essentially the same manner as example 1, except that: glass fiber paper is adopted to replace a polymer film.

Comparative example 2

The comparative example was prepared in essentially the same manner as example 1, except that: the front surface of the mica layer is not coated with a high-temperature resistant binder.

Comparative example 3

The comparative example was prepared in essentially the same manner as example 1, except that: the silicon rubber self-adhesive layer is not added with a boron-containing tackifier.

And (3) performance detection:

the preparation methods of examples 1 to 6 and comparative examples 1 to 3 were respectively used to prepare a fire-resistant composite tape, and a commercially available mica composite tape produced by a certain company was selected for performance test, and specific test results are shown in table 1.

TABLE 1 statistical table of performance tests

Group of	Degree of fire resistance	Flexibility	Tensile strength	Elongation percentage	Peel strength
						Example 1	1250℃	Is preferably used	167Pa	20％	32N/cm
Example 2	1300℃	Is preferably used	176Pa	20％	41N/cm
						Example 3	1300℃	Is preferably used	182Pa	20％	43N/cm
Example 4	1360℃	Is preferably used	169Pa	20％	38N/cm
						Example 5	1550℃	Is preferably used	173Pa	20％	39N/cm
Comparative example 1	1200℃	In general	124Pa	15％	22N/cm
						Comparative example 2	1160℃	Is preferably used	156Pa	20％	30N/cm
Comparative example 3	1000℃	Is preferably used	148Pa	20％	26N/cm
						Commercially available product	<850℃	In general	110Pa	10％	10N/cm

According to the performance detection results in table 1, the preparation method of the modified silicone rubber ceramization mica fire-resistant composite tape provided by the invention has the advantages of fire resistance, mechanical strength and flexibility compared with the existing products in the market, meets the cable use under extreme conditions, and has better economic benefit.

The foregoing is merely exemplary and illustrative of the present inventive concept and various modifications, additions and substitutions of similar embodiments may be made to the specific embodiments described by those skilled in the art without departing from the inventive concept or exceeding the scope of the claims as defined in the accompanying claims.