阅读说明：本技术 一种高强度悬式绝缘子裹釉沙及其制备方法 (High-strength suspension insulator glaze-wrapped sand and preparation method thereof ) 是由 徐秀娟 胡秦然 杨生哲 高琍玲 刘少华 于 2020-11-27 设计创作，主要内容包括：本发明公开了一种高强度悬式绝缘子裹釉沙及其制备方法,属于瓷绝缘子制备技术领域。本发明的高强度悬式绝缘子裹釉沙是由釉水和多孔陶瓷沙粒调和而成,多孔氧化铝陶瓷沙粒的制备方法为：将一定比例的高岭土、SiO-2粉、Al-2O-3粉、悬浮增稠剂、造孔剂和水混匀后制得料浆,然后浇模、干燥、烧结、粉碎和过筛,得到所需粒径的沙粒,其质轻坚硬,耐磨性好,表面气孔密集,增大了与釉水之间的粘结面积。将裹釉沙涂覆在已施釉完毕的瓷杆体胶装部位的表面釉层中并使沙粒突出釉层,烧结后,沙粒不易从釉层脱落,增强瓷杆体胶装部位的摩擦力。本发明制备多孔氧化铝陶瓷沙粒的原料和工艺较为简单,设计合理,易于实施,具有良好的工业应用价值。(The invention discloses high-strength suspension insulator glaze-wrapped sand and a preparation method thereof, and belongs to the technical field of porcelain insulator preparation. The invention relates to a high-strength suspension insulator wrapped glaze sand which is prepared by blending glaze water and porous ceramic sand grains, wherein the preparation method of the porous alumina ceramic sand grains comprises the following steps: mixing kaolin and SiO in a certain proportion 2 Powder, Al 2 O 3 The powder, the suspension thickening agent, the pore-forming agent and water are mixed uniformly to prepare slurry, and then the slurry is cast, dried, sintered, crushed and sieved to obtain sand grains with required grain size, wherein the sand grains are light and hard in weight, good in wear resistance and dense in surface pores, and the bonding area between the sand grains and glaze water is increased. Coating the glaze-wrapped sand on the surface glaze layer of the glazed ceramic rod body cementing part to enable sand grains to protrude out of the glaze layer, wherein after sintering, the sand grains are not easy to fall off from the glaze layer, and the cementing part of the ceramic rod body is enhancedThe friction force of (3). The porous alumina ceramic sand grain prepared by the method has the advantages of simple raw materials and process, reasonable design, easy implementation and good industrial application value.)

1. The high-strength suspension insulator glaze-wrapped sand is characterized in that sand grains in the high-strength suspension insulator glaze-wrapped sand are porous ceramic sand grains.

2. The high strength suspension insulator glazed sand of claim 1, wherein the porous ceramic sand particles are of a size: 10-20% of the particle size of more than 1.5mm, 70-80% of the particle size of 0.5-1.5 mm, and less than or equal to 5% of the particle size of less than 0.5 mm.

3. The method for preparing the high-strength insulator glazed sand as claimed in claim 1, wherein the method comprises the following steps:

(1) preparing porous ceramic;

(2) crushing and screening the porous ceramic to obtain porous ceramic sand grains;

(3) and (3) blending the porous ceramic sand particles with glaze water to obtain the glaze-wrapped sand.

4. The method for preparing the high-strength insulator glazed sand according to claim 3, wherein the method for preparing the porous ceramic in the step 1) comprises the following steps:

1) 40-50 parts of kaolin and 10-20 parts of SiO₂Powder, 5-10 mass parts of Al₂O₃Preparing raw materials of micro powder, 0.5-1 part by mass of suspension thickening agent and 5-15 parts by mass of pore-forming agent;

2) mixing Kaolin and SiO₂Ball milling and sieving to control the particle size below 50 microns;

3) mixing all the raw materials, adding tap water, and uniformly mixing to obtain slurry, wherein the weight ratio of the raw materials to the water is 5: 4-5: 5;

4) pouring the slurry into a mold, and curing to obtain a blank;

5) and after the blank is dried, putting the blank into a kiln to be fired to obtain the high-porosity porous ceramic.

5. The method for preparing high-strength insulator glazed sand according to claim 4, wherein the suspension thickening agent is a medium federal suspension thickening agent.

6. The method for preparing the high-strength insulator glazed sand as claimed in claim 4, wherein the pore-forming agent is starch.

7. The method for preparing the high-strength insulator glazed sand according to claim 3, wherein the step (2) of crushing and screening the porous ceramic to obtain the porous ceramic sand particles comprises the following specific steps: the porous ceramic is smashed and placed in a ball mill for grinding, then sieving is carried out, and sand grains with required granularity are screened out by using a screen.

Technical Field

The invention belongs to the technical field of porcelain insulator preparation, and particularly relates to high-strength suspension insulator glaze-wrapped sand and a preparation method thereof.

Background

In order to enhance the binding strength of the porcelain rod body and the metal accessory on the porcelain insulator, a porcelain insulator manufacturer adopts special sand grains to be directly adhered or sprayed on the surface of the porcelain rod body after being adhered with a little glaze water, and the special sand grains are sintered and fixed with an original glaze layer on the surface of the porcelain rod body, so that the outer surface of the glaze layer is provided with an uneven sand layer, and the sand layer is bound with the metal accessory in a binding manner. The method improves the binding force of the cementing interface of the ceramic rod body to a certain extent. However, this method is limited in that: the sand in the sand layer is often only partially embedded into the surface glaze layer of the porcelain rod body, and the adhesion and the bonding force between the sand layer and the glaze layer are poor, so that the conditions of sand piling, sand shortage (falling), sand layer incrustation and the like frequently occur at the cementing part of the porcelain rod body, the cementing interface on the porcelain rod body is short of an effective adhesion layer, the cementing reliability of the porcelain rod body and a metal accessory is greatly reduced, and the yield and the service life of the product are seriously reduced.

The invention patent 2008100231725 discloses a special glaze-coated sand process for high-strength porcelain insulators, which is characterized in that sand grains are completely coated and sintered in glaze by means of coating a layer of adhesive on the surfaces of the sand grains in advance and then coating the glaze and further sintering the glaze layer on the surface of a cementing part of a porcelain rod body. The method improves the binding force between the sand grains and the glaze to a certain extent, but the process is complicated and is not suitable for all production scenes.

Disclosure of Invention

Aiming at the problems in the prior art, the technical problem to be solved by the invention is to provide a high-strength suspension insulator glaze-wrapped sand which is used for coating in a surface glaze layer of a glazed porcelain rod body cementing part and enabling sand grains to protrude out of the glaze layer, so that the friction force of the porcelain rod body cementing part is enhanced after sintering, and the cementing strength of the porcelain rod body and a metal accessory is increased. The invention aims to provide a preparation method of the high-strength suspension insulator wrapped glaze sand.

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

the high-strength suspension insulator glaze-wrapped sand is characterized in that sand grains in the high-strength suspension insulator glaze-wrapped sand are porous ceramic sand grains.

Further, the size of the porous ceramic sand grains is as follows: 10-20% of the particle size of more than 1.5mm, 70-80% of the particle size of 0.5-1.5 mm, and less than or equal to 5% of the particle size of less than 0.5 mm.

The preparation method of the high-strength insulator glaze-wrapped sand comprises the following steps:

(1) preparing porous ceramic;

(2) crushing and screening the porous ceramic to obtain porous ceramic sand grains;

(3) and blending the porous ceramic sand particles with the glaze to obtain the glaze-wrapped sand.

Further, the preparation method of the porous ceramic in the step 1) comprises the following steps:

1) 40-50 parts of kaolin and 10-20 parts of SiO₂Powder, 5-10 mass parts of Al₂O₃Preparing raw materials of micro powder, 0.5-1 part by mass of suspension thickening agent and 5-15 parts by mass of pore-forming agent;

2) mixing Kaolin and SiO₂Ball milling and sieving to control the particle size below 50 microns;

3) mixing all the raw materials, adding tap water, and uniformly mixing to obtain slurry, wherein the weight ratio of the raw materials to the water is 5: 4-5: 5;

4) pouring the slurry into a mold, and curing to obtain a blank;

5) and after the blank is dried, putting the blank into a kiln to be fired to obtain the high-porosity porous ceramic.

Further, the suspension thickener is a medium federal suspension thickener.

Further, the pore-forming agent is starch.

Further, the specific method for crushing and screening the porous ceramic to obtain the porous ceramic sand particles in the step (2) comprises the following steps: the porous ceramic is smashed and placed in a ball mill for grinding, then sieving is carried out, and sand grains with required granularity are screened out by using a screen.

Compared with the prior art, the invention has the beneficial effects that:

the invention provides a high-strength suspension insulator glaze-wrapped sand which is prepared by blending sand grains and glaze, wherein the sand grains are porous alumina ceramic sand grains, so that the sand grains are light and hard, good in wear resistance and dense in surface pores, the bonding area between the sand grains and glaze water is increased, the sand grains are coated in a surface glaze layer of a glazed porcelain rod body cementing part and protrude out of the glaze layer, after sintering, the sand grains are not easy to fall off from the glaze layer, the friction force of the glazed porcelain rod body cementing part is enhanced, and the cementing strength of the porcelain rod body and a metal accessory is increased. The porous alumina ceramic sand grain prepared by the method has the advantages of simple raw materials and process, reasonable design, easy implementation and good industrial application value.

Detailed Description

The invention is further described with reference to specific examples.

Example 1:

1. preparation of porous ceramics

(1) The raw material formula is as follows: 40 parts by mass of kaolin and 10 parts by mass of SiO₂Powder, 5 parts by mass of Al₂O₃Micro powder (3-8 microns), 0.5 part by mass of a medium federal suspension thickening agent and 5 parts by mass of starch;

(2) mixing Kaolin and SiO₂Grinding and sieving the powder balls, and controlling the particle size to be below 50 microns;

(3) mixing all the raw materials, adding water, and uniformly mixing to obtain slurry, wherein the weight ratio of the raw materials to the water is 5: 4;

(4) pouring the slurry into a mold, and curing to obtain a blank;

(5) and after the blank is dried, putting the blank into a kiln, and sintering the blank at 1300 ℃ to obtain the high-porosity porous ceramic.

2. Preparation of porous ceramic Sand

The porous ceramic is smashed and placed in a ball mill for grinding, then sieving is carried out, and sand grains with required granularity are screened out by using a screen. After screening, the sand grains are controlled to have the grain size of more than 1.5mm accounting for 10-20%, the grain size of 0.5-1.5 mm accounting for 70-80%, and the grain size of less than 0.5mm not exceeding 5%, and the surface of the obtained sand grains is uneven due to the existence of air holes.

3. The glaze-coated sand is obtained by coating the sand grains made of the porous ceramic with the glaze, and the glaze-coated sand can be coated on the surface glaze layer of the glazed porcelain rod body gluing part, so that the glazed sand grains partially protrude out of the glaze layer, and after sintering, because the sand grains are of a porous structure, the bonding area between the sand grains and the glaze is increased, the bonding force between the sand grains and the glaze layer is enhanced, and the sand grains are not easy to fall off from the glaze.

Example 2:

1. preparation of porous ceramics

(1) The raw material formula is as follows: 50 parts by mass of kaolin and 20 parts by mass of SiO₂Powder, 10 parts by mass of Al₂O₃Micro powder, 1 part by mass of a medium federal suspension thickener and 15 parts by mass of starch;

(2) mixing Kaolin and SiO₂Grinding and sieving the powder balls, and controlling the particle size to be below 50 microns;

(3) mixing all the raw materials, adding water, and uniformly mixing to obtain slurry, wherein the weight ratio of the raw materials to the water is 5: 5;

(4) pouring the slurry into a mold, and curing to obtain a blank;

(5) and after the blank is dried, putting the blank into a kiln, and sintering the blank at 1300 ℃ to obtain the high-porosity porous ceramic.

2. Preparation of porous ceramic Sand

The porous ceramic is smashed and placed in a ball mill for grinding, then sieving is carried out, and sand grains with required granularity are screened out by using a screen. After screening, the sand grains are controlled to have the grain size of more than 1.5mm accounting for 10-20%, the grain size of 0.5-1.5 mm accounting for 70-80%, and the grain size of less than 0.5mm not exceeding 5%, and the surface of the obtained sand grains is uneven due to the existence of air holes.

3. The surface of sand grains made of porous ceramics is wrapped with glaze to obtain the glaze-wrapped sand which can be coated in a surface glaze layer of a glazed porcelain rod body cementing part, so that the glaze-wrapped sand grains partially protrude out of the glaze layer, and after sintering, because the sand grains are of a porous structure, the bonding area between the sand grains and the glaze is increased, the bonding force between the sand grains and the glaze is enhanced, and the sand grains are not easy to fall off from the glaze.