阅读说明：本技术 一种高强度氧化铝瓷芯棒复合绝缘子及其制备方法 (High-strength alumina porcelain core rod composite insulator and preparation method thereof ) 是由 胡秦然 杨生哲 高琍玲 徐秀娟 刘少华 于 2020-12-02 设计创作，主要内容包括：本发明公开了一种高强度氧化铝瓷芯棒复合绝缘子及其制备方法,属于绝缘子制备技术领域。该复合绝缘子由工业氧化铝粉、二氧化硅、石英矿、莫来石粉、黏土、硅酸铝镁增塑剂、蛭石粉和氧化钾组成；在制备工艺中原料预处理采用机械正向研磨和反向研磨相结合的方式,增加了原料的混合均匀度；优化烧结温度和时间,选择性能更佳的釉料,以上各方面的改进均对复合绝缘子的性能提升起到一定的促进作用。最终得到的复合绝缘子力学性能和耐热阻燃性能优良,氧指数达到35％,不易燃烧,热变形温度达到328℃,耐热阻燃,延长了绝缘子的使用寿命。(The invention discloses a high-strength alumina porcelain core rod composite insulator and a preparation method thereof, and belongs to the technical field of insulator preparation. The composite insulator consists of industrial alumina powder, silicon dioxide, quartz ore, mullite powder, clay, aluminum magnesium silicate plasticizer, vermiculite powder and potassium oxide; in the preparation process, the raw material pretreatment adopts a mode of combining mechanical forward grinding and reverse grinding, so that the mixing uniformity of the raw materials is improved; the sintering temperature and time are optimized, glaze with better performance is selected, and the improvement of all aspects plays a certain role in promoting the performance of the composite insulator. The finally obtained composite insulator is excellent in mechanical property and heat-resistant flame-retardant property, the oxygen index reaches 35%, the composite insulator is not easy to burn, the thermal deformation temperature reaches 328 ℃, the composite insulator is heat-resistant and flame-retardant, and the service life of the insulator is prolonged.)

1. The high-strength alumina porcelain core rod composite insulator is characterized by comprising the following components in parts by weight: 40-100 parts of industrial alumina powder, 20-40 parts of silicon dioxide, 10-30 parts of quartz ore, 5-25 parts of mullite powder, 10-35 parts of clay, 5-10 parts of aluminum magnesium silicate plasticizer, 0.5-2.5 parts of vermiculite powder and 0.1-1 part of potassium oxide.

2. The high-strength alumina porcelain core rod composite insulator is characterized by comprising the following components in parts by weight: 75-96 parts of industrial alumina powder, 22-31 parts of silicon dioxide, 13-25 parts of quartz ore, 5-8 parts of mullite powder, 23-32 parts of clay, 5-8 parts of aluminum magnesium silicate plasticizer, 1.5 parts of vermiculite powder and 0.7 part of potassium oxide.

3. The high-strength alumina porcelain core rod composite insulator is characterized by comprising the following components in parts by weight: 78 parts of industrial alumina powder, 29 parts of silicon dioxide, 21 parts of quartz ore, 7 parts of mullite powder, 27 parts of clay, 8 parts of magnesium aluminum silicate plasticizer, 1.5 parts of vermiculite powder and 0.7 part of potassium oxide.

4. The preparation method of the high-strength alumina porcelain core rod composite insulator as claimed in any one of claims 1 to 3, which is characterized by comprising the following steps:

(1) mixing the raw materials in the formula, and then adding water into a ball mill for ball milling to form fine slurry;

(2) preparing an alumina porcelain core rod green body by adopting a die forming method;

(3) immersing the alumina ceramic core rod green body into the glaze solution for 30-60 s, and sintering after glaze immersion to obtain a ceramic core rod semi-finished product;

(4) cleaning pollutants on the surface of the semi-finished product of the porcelain core rod, and then drying the semi-finished product of the porcelain core rod to constant weight at 85 ℃; and (3) after drying, brushing a layer of silane coupling agent KH560, putting into a silicon rubber injection mold, and molding with silicon rubber by adopting a vulcanization process to obtain the composite insulator.

5. The method for preparing the high-strength alumina porcelain core rod composite insulator according to claim 4, wherein in the step (1), the water is added in an amount of 50-300% of the total amount of the raw materials; wet grinding until the particle size of the powder is less than 5 mu m, sieving the slurry, and removing ferromagnetic impurities in the slurry by using an iron remover.

6. The preparation method of the high-strength alumina porcelain core rod composite insulator according to claim 4, wherein in the step (1), in the process of the mechanical ball mill, the mechanical ball mill is firstly rotated forwards at a rotating speed of 100-300 r/min for 2-10h, and then is rotated backwards at a rotating speed of 500-1500 r/min for 3-10 h.

7. The preparation method of the high-strength alumina porcelain core rod composite insulator according to claim 4, wherein the glaze comprises the following raw materials in parts by weight: 10-55 parts of silica sol, 5-25 parts of methyl silane, 15-25 parts of formic acid, 5-10 parts of sodium oxide and 20-40 parts of polyvinylpyrrolidone.

8. The method for preparing the high-strength alumina porcelain core rod composite insulator according to claim 4, wherein the preparation of the glaze melt is as follows: grinding the oil raw materials until the particle size is 0.5-5 mu m, then adding water accounting for 50% of the glaze mass into the glaze, and uniformly stirring to obtain glaze melt.

9. The preparation method of the high-strength alumina porcelain core rod composite insulator according to claim 4, wherein the sintering temperature is 1250-1550 ℃ and the sintering time is 10-48 h.

Technical Field

The invention belongs to the technical field of insulator preparation, and particularly relates to a high-strength alumina porcelain core rod composite insulator and a preparation method thereof.

Background

Insulators are devices that are mounted between conductors of different potentials or between a conductor and a ground potential member and are able to withstand the effects of voltage and mechanical stress. The insulating control is a special insulating control and can play an important role in an overhead transmission line. Early-year insulators are mostly used for telegraph poles, and a plurality of disc-shaped insulators are hung at one end of a high-voltage wire connecting tower which is gradually developed, are used for increasing creepage distance and are usually made of glass or ceramics, namely insulators.

The insulator is influenced by the natural environment outdoors for a long time, and the aging problem can occur; the existing insulator formula has certain defects, and the insulator product has the problems of poor performances such as expansion, cracking, bending strength, breaking strength and the like, and the reduction of the related performances can cause potential safety hazards, thereby not only damaging the public property of the society, but also causing great threat to the physical and mental health of people. Therefore, in order to improve various performances of the insulator, the product formula and the preparation process are optimized, and the service life of the insulator product is prolonged.

Disclosure of Invention

Aiming at the problems in the prior art, the invention aims to solve the technical problem of providing a high-strength alumina porcelain core rod composite insulator, which optimizes the formula of the composite insulator and obtains the optimal formula after multiple creative attempts; the mechanical property and the flame retardant property of the composite insulator are effectively improved. And the service life of the composite insulator is further prolonged. The invention aims to solve another technical problem and provides a preparation method of the high-strength alumina porcelain core rod composite insulator.

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

a high-strength alumina porcelain core rod composite insulator comprises the following components in parts by weight: 40-100 parts of industrial alumina powder, 20-40 parts of silicon dioxide, 10-30 parts of quartz ore, 5-25 parts of mullite powder, 10-35 parts of clay, 5-10 parts of aluminum magnesium silicate plasticizer, 0.5-2.5 parts of vermiculite powder and 0.1-1 part of potassium oxide.

The high-strength alumina porcelain core rod composite insulator comprises the following components in parts by weight: 75-96 parts of industrial alumina powder, 22-31 parts of silicon dioxide, 13-25 parts of quartz ore, 5-8 parts of mullite powder, 23-32 parts of clay, 5-8 parts of aluminum magnesium silicate plasticizer, 1.5 parts of vermiculite powder and 0.7 part of potassium oxide.

The high-strength alumina porcelain core rod composite insulator comprises the following components in parts by weight: 78 parts of industrial alumina powder, 29 parts of silicon dioxide, 21 parts of quartz ore, 7 parts of mullite powder, 27 parts of clay, 8 parts of magnesium aluminum silicate plasticizer, 1.5 parts of vermiculite powder and 0.7 part of potassium oxide.

The preparation method of the high-strength alumina porcelain core rod composite insulator comprises the following steps:

(1) mixing the raw materials in the formula, and then adding water into a ball mill for ball milling to form fine slurry;

(2) preparing an alumina porcelain core rod green body by adopting a die forming method;

(3) immersing the alumina ceramic core rod green body into the glaze solution for 30-60 s, and sintering after glaze immersion to obtain a ceramic core rod semi-finished product;

(4) cleaning pollutants on the surface of the semi-finished product of the porcelain core rod, and then drying the semi-finished product of the porcelain core rod to constant weight at 85 ℃; and (3) after drying, brushing a layer of silane coupling agent KH560, putting into a silicon rubber injection mold, and molding with silicon rubber by adopting a vulcanization process to obtain the composite insulator.

The preparation method of the high-strength alumina porcelain core rod composite insulator comprises the following steps of (1) adding water in an amount of 50-300% of the total amount of raw materials; wet grinding until the particle size of the powder is less than 5 mu m, sieving the slurry, and removing ferromagnetic impurities in the slurry by using an iron remover.

In the step (1), in the process of the mechanical ball mill, the mechanical ball mill is rotated forwards at a rotating speed of 100-300 r/min for 2-10 hours, and then is rotated backwards at a rotating speed of 500-1500 r/min for 3-10 hours.

The preparation method of the high-strength alumina porcelain core rod composite insulator comprises the following raw materials in parts by weight: 10-55 parts of silica sol, 5-25 parts of methyl silane, 15-25 parts of formic acid, 5-10 parts of sodium oxide and 20-40 parts of polyvinylpyrrolidone.

The preparation method of the high-strength alumina porcelain core rod composite insulator comprises the following steps of: grinding the oil raw materials until the particle size is 0.5-5 mu m, then adding water accounting for 50% of the glaze mass into the glaze, and uniformly stirring to obtain glaze melt.

According to the preparation method of the high-strength alumina porcelain core rod composite insulator, the sintering temperature is 1250-1550 ℃, and the sintering time is 10-48 hours.

Has the advantages that: compared with the prior art, the invention has the advantages that:

(1) the formula of the composite insulator is optimized, and the optimal formula is obtained after multiple creative attempts; in the preparation process, the mode of combining mechanical forward grinding and reverse grinding is adopted for grinding the raw materials, so that the mixing uniformity of the raw materials is increased, and a certain promotion effect on the performance improvement of the composite insulator is achieved.

(2) According to the invention, by optimizing the formula and the preparation process of the composite insulator, the finally obtained composite insulator has excellent mechanical property and heat-resistant flame-retardant property, the oxygen index reaches 35%, the composite insulator is not easy to burn, the thermal deformation temperature reaches 328 ℃, the heat-resistant flame-retardant property is realized, and the service life of the insulator is prolonged.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with examples are described in detail below.

Example 1

A high-strength alumina porcelain core rod composite insulator comprises the following components in parts by weight: 75 parts of industrial alumina powder, 22 parts of silicon dioxide, 25 parts of quartz ore, 7 parts of mullite powder, 23 parts of clay, 8 parts of magnesium aluminum silicate plasticizer, 1.5 parts of vermiculite powder and 0.7 part of potassium oxide.

The preparation method of the high-strength alumina porcelain core rod composite insulator comprises the following steps:

(1) mixing the raw materials in the formula, and then adding water into a ball mill for ball milling to form fine slurry; the water addition amount is 225 percent of the total amount of the raw materials; wet grinding until the particle size of the powder is less than 5 mu m, sieving the slurry, and removing ferromagnetic impurities in the slurry by using an iron remover; in the process of the mechanical ball mill, the ball milling is carried out for 4 hours by adopting a rotating speed of 275r/min to rotate forwards and then for 5 hours by adopting a rotating speed of 750r/min to rotate backwards;

(2) preparing an alumina porcelain core rod green body by adopting a die forming method;

(3) immersing the green alumina ceramic core rod blank into the glaze solution for 40s, and sintering after glaze immersion, wherein the sintering temperature is 1450 ℃, and the sintering time is 32h, so as to obtain a semi-finished ceramic core rod product; the glaze comprises the following raw materials in parts by weight: 35 parts of silica sol, 18 parts of methyl silane, 22 parts of formic acid, 8 parts of sodium oxide and 33 parts of polyvinylpyrrolidone; grinding the glaze raw materials until the particle size is 2.5-4.5 microns, then adding water accounting for 50% of the mass of the glaze into the glaze, and uniformly stirring to obtain a glaze solution;

(4) cleaning pollutants on the surface of the semi-finished product of the porcelain core rod, and then drying the semi-finished product of the porcelain core rod to constant weight at 85 ℃; and (3) after drying, brushing a layer of silane coupling agent KH560, putting into a silicon rubber injection mold, and molding with silicon rubber by adopting a vulcanization process to obtain the composite insulator.

Example 2

A high-strength alumina porcelain core rod composite insulator comprises the following components in parts by weight: 78 parts of industrial alumina powder, 29 parts of silicon dioxide, 21 parts of quartz ore, 7 parts of mullite powder, 27 parts of clay, 8 parts of magnesium aluminum silicate plasticizer, 1.5 parts of vermiculite powder and 0.7 part of potassium oxide.

The preparation method of the high-strength alumina porcelain core rod composite insulator comprises the following steps:

(1) mixing the raw materials in the formula, and then adding water into a ball mill for ball milling to form fine slurry; the water addition amount is 175 percent of the total amount of the raw materials; wet grinding until the particle size of the powder is less than 5 mu m, sieving the slurry, and removing ferromagnetic impurities in the slurry by using an iron remover; in the process of the mechanical ball mill, firstly rotating the mechanical ball mill for 6 hours in a forward rotation mode at the rotating speed of 125r/min, and then rotating the mechanical ball mill for 3 hours in a reverse rotation mode at the rotating speed of 1250 r/min;

(2) preparing an alumina porcelain core rod green body by adopting a die forming method;

(3) immersing the green alumina ceramic core rod blank into the glaze solution for 40s, and sintering after glaze immersion, wherein the sintering temperature is 1450 ℃, and the sintering time is 32h, so as to obtain a semi-finished ceramic core rod product; the glaze comprises the following raw materials in parts by weight: 35 parts of silica sol, 18 parts of methyl silane, 22 parts of formic acid, 8 parts of sodium oxide and 33 parts of polyvinylpyrrolidone; grinding the glaze raw materials until the particle size is 2.5-4.5 microns, then adding water accounting for 50% of the mass of the glaze into the glaze, and uniformly stirring to obtain a glaze solution;

(4) cleaning pollutants on the surface of the semi-finished product of the porcelain core rod, and then drying the semi-finished product of the porcelain core rod to constant weight at 85 ℃; and (3) after drying, brushing a layer of silane coupling agent KH560, putting into a silicon rubber injection mold, and molding with silicon rubber by adopting a vulcanization process to obtain the composite insulator.

Example 3

A high-strength alumina porcelain core rod composite insulator comprises the following components in parts by weight: 85 parts of industrial alumina powder, 22 parts of silicon dioxide, 18 parts of quartz ore, 7 parts of mullite powder, 27 parts of clay, 8 parts of magnesium aluminum silicate plasticizer, 1.5 parts of vermiculite powder and 0.7 part of potassium oxide.

The preparation method of the high-strength alumina porcelain core rod composite insulator comprises the following steps:

(1) mixing the raw materials in the formula, and then adding water into a ball mill for ball milling to form fine slurry; the water addition amount is 200 percent of the total amount of the raw materials; wet grinding until the particle size of the powder is less than 5 mu m, sieving the slurry, and removing ferromagnetic impurities in the slurry by using an iron remover; in the process of the mechanical ball mill, the mechanical ball mill is firstly rotated forwards at the rotating speed of 215r/min for 10 hours, and then rotated backwards at the rotating speed of 750r/min for 10 hours;

(2) preparing an alumina porcelain core rod green body by adopting a die forming method;

(3) immersing the green alumina ceramic core rod blank into the glaze solution for 40s, and sintering after glaze immersion, wherein the sintering temperature is 1250 ℃, and the sintering time is 15h, so as to obtain a semi-finished ceramic core rod product; the glaze comprises the following raw materials in parts by weight: 35 parts of silica sol, 18 parts of methyl silane, 22 parts of formic acid, 8 parts of sodium oxide and 33 parts of polyvinylpyrrolidone; grinding the glaze raw materials until the particle size is 2.5-4.5 microns, then adding water accounting for 50% of the mass of the glaze into the glaze, and uniformly stirring to obtain a glaze solution;

(4) cleaning pollutants on the surface of the semi-finished product of the porcelain core rod, and then drying the semi-finished product of the porcelain core rod to constant weight at 85 ℃; and (3) after drying, brushing a layer of silane coupling agent KH560, putting into a silicon rubber injection mold, and molding with silicon rubber by adopting a vulcanization process to obtain the composite insulator.

And (3) performance testing: the composite insulator materials prepared in examples 1 to 3 were subjected to various performance tests, and specific results are shown in table 1.

Table 1 results of performance testing

As can be seen from Table 1, the composite insulator obtained by optimizing the formula and the preparation process of the composite insulator has excellent mechanical property, heat resistance and flame retardance, the oxygen index reaches 35%, the composite insulator is not easy to burn, the thermal deformation temperature reaches 328 ℃, the heat resistance and the flame retardance are realized, and the service life of the insulator is prolonged.