阅读说明：本技术 一种自修复电工作业绝缘操作杆的制备方法 (Preparation method of self-repairing electrical operation insulating operating rod ) 是由 徐爱民 李周选 高义波 韩怡秋 朱峰 于 2020-10-30 设计创作，主要内容包括：本发明公开了一种自修复电工作业绝缘操作杆的制备方法,它包括如下步骤：1、将尿素和甲醛加入三口烧瓶中,通过调节ph值和温度,形成稳定透明的尿素甲醛预聚体；2、将环氧树脂与二甲苯混合,加入消泡剂正辛醇,得到芯材乳液,将预聚体缓慢加入芯材中,调节ph值后进行恒温固化,随后经过滤洗和干燥,得到微胶囊；3、将步骤2得到的微胶囊与环氧树脂、固化剂混合均匀,上述微胶囊的质量为总质量的5%～20%；4、将步骤3得到的与微胶囊均匀混合的环氧树脂浸润玻璃纤维,将浸润后的玻璃纤维经过拉挤模具并加热固化,最终制得自修复电工作业绝缘操作杆杆体。本发明制作的自修复电工作业绝缘操作杆在运输或施工过程中受到外力破坏时,其包含的微胶囊能够自行释放粘结剂,对裂纹进行修复,保证了电工作业绝缘操作杆的结构完整性,减少了产品的报废率,大幅提升带电作业人员的生命安全。(The invention discloses a preparation method of a self-repairing electrician operation insulating operating rod, which comprises the following steps: 1. adding urea and formaldehyde into a three-neck flask, and forming a stable and transparent urea-formaldehyde prepolymer by adjusting the pH value and the temperature; 2. mixing epoxy resin and xylene, adding n-octyl alcohol serving as a defoaming agent to obtain a core material emulsion, slowly adding a prepolymer into a core material, adjusting the pH value, curing at a constant temperature, and then filtering, washing and drying to obtain a microcapsule; 3. uniformly mixing the microcapsule obtained in the step 2 with epoxy resin and a curing agent, wherein the mass of the microcapsule is 5-20% of the total mass; 4. and (3) soaking the glass fiber with the epoxy resin uniformly mixed with the microcapsule obtained in the step (3), and heating and curing the soaked glass fiber through a pultrusion die to finally prepare the self-repairing electrical operation insulating operating rod body. When the self-repairing electrical operation insulating operating rod manufactured by the invention is damaged by external force in the transportation or construction process, the microcapsules contained in the self-repairing electrical operation insulating operating rod can automatically release the binder to repair cracks, so that the structural integrity of the electrical operation insulating operating rod is ensured, the rejection rate of products is reduced, and the life safety of live working personnel is greatly improved.)

1. A preparation method of a self-repairing electrician operation insulating operating rod body is characterized by comprising the following steps:

step 1: adding urea and formaldehyde into a three-neck flask, adjusting the pH value to 8-9 by using triethanolamine, heating to 70 ℃, slowly stirring, carrying out heat preservation reaction for 1h to obtain viscous liquid, and forming a stable and transparent urea-formaldehyde prepolymer for later use;

step 2: mixing epoxy resin and dimethylbenzene, adding n-octanol serving as a defoaming agent to obtain a core material emulsion, pouring the core material into a 250ml three-neck flask, slowly dripping the prepolymer obtained in the step 1 into the core material at a slow rotating speed, acidifying with citric acid for 1.5 hours after dripping is finished, adjusting the pH value to 3, and then carrying out constant-temperature curing; filtering the obtained product, washing with acetone and distilled water for 3 times to obtain filter cake, and drying at 30 deg.C for 30min to obtain solid powder as microcapsule;

and step 3: uniformly mixing the microcapsule obtained in the step 2 with epoxy resin and a curing agent, wherein the mass of the microcapsule is 5-20% of the total mass;

and 4, step 4: and (3) soaking the glass fiber with the epoxy resin uniformly mixed with the microcapsule obtained in the step (3), and heating and curing the soaked glass fiber through a pultrusion die to finally prepare the self-repairing electrical operation insulating operating rod body.

2. The preparation method of the self-repairing electrical operation insulating operating rod body of claim 1, characterized in that: in the step 1, the mass ratio of the urea to the formaldehyde is 1: 1-1: 5.

3. The preparation method of the self-repairing electrical operation insulating operating rod body of claim 1, characterized in that: in the step 2, the mass ratio of the epoxy resin to the dimethylbenzene is 1: 1-4: 1.

4. The preparation method of the self-repairing electrical operation insulating operating rod body of claim 1, characterized in that: in step 2, the epoxy resin is selected from any one or a combination of two or more of bisphenol A epoxy resin, bisphenol F epoxy resin, bisphenol S epoxy resin, hydrogenated bisphenol A epoxy resin, linear phenol formaldehyde epoxy resin, aliphatic glycidyl ether epoxy resin and tetrabromobisphenol A epoxy resin.

5. The preparation method of the self-repairing electrical operation insulating operating rod body of claim 1, characterized in that: in the step 2, the rotating speed is 200-1000 r/min.

6. The preparation method of the self-repairing electrical operation insulating operating rod body of claim 1, characterized in that: in step 3, the curing agent is selected from any one of amine curing agents or a combination of two or more of the amine curing agents.

7. The preparation method of the self-repairing electrical operation insulating operating rod body of claim 1, characterized in that: in the step 3, the addition amount of the curing agent is 8-12% of the mass of the epoxy resin.

Technical Field

The invention relates to the technical field of preparation of insulating operating rods for electrician operation, in particular to a preparation method of a rod body of a self-repairing insulating operating rod for electrician operation.

Background

The insulating operating rod has high insulating property and long operating distance, and is an important protection tool for live working personnel. With the continuous improvement of the voltage grade of the power transmission line, the performance requirement of the insulating operating rod is increased day by day, and meanwhile, the insulating operating rod also has some technical problems, such as the problems that the rod body is easy to age, pulverize and have defects, the detection cannot be carried out, and the like, particularly, micro cracks which cannot be seen by naked eyes, which are generally called micro cracks, appear. The distribution of the fine cracks is irregular and discontinuous, but under the action of external force damage or further temperature and drying shrinkage, the cracks begin to spread and gradually penetrate through each other, so that rod body fracture occurs. If the microcracks can be discovered early and powerful repair measures taken, this is critical to the useful life of the insulated operating rod.

Most researchers are concerned with the insulating and mechanical properties of insulated operating rods, ignoring the most fundamental structural stability. Therefore, there is an urgent need to develop a method for prolonging the service life of the insulated operating rod.

Disclosure of Invention

The invention aims to provide a method for preparing a self-repairing insulating operating rod body for electrician operation, which is efficient and economical.

In order to realize the purpose, the technical scheme adopted by the invention is as follows: a preparation method of a self-repairing electrician operation insulating operating rod body is characterized by comprising the following steps:

step 1: adding urea and formaldehyde into a three-neck flask, adjusting the pH value to 8-9 by using triethanolamine, heating to 70 ℃, slowly stirring, carrying out heat preservation reaction for 1h to obtain viscous liquid, and forming a stable and transparent urea-formaldehyde prepolymer for later use;

step 2: mixing epoxy resin and dimethylbenzene, adding n-octanol serving as a defoaming agent to obtain a core material emulsion, pouring the core material into a 250ml three-neck flask, slowly dripping the prepolymer obtained in the step 1 into the core material at a slow rotating speed, acidifying with citric acid for 1.5 hours after dripping is finished, adjusting the pH value to 3, and then carrying out constant-temperature curing; filtering the obtained product, washing with acetone and distilled water for 3 times to obtain filter cake, and drying at 30 deg.C for 30min to obtain solid powder as microcapsule;

and step 3: uniformly mixing the microcapsule obtained in the step 2 with epoxy resin and a curing agent, wherein the mass of the microcapsule is 5-20% of the total mass;

and 4, step 4: and (3) soaking the glass fiber with the epoxy resin uniformly mixed with the microcapsule obtained in the step (3), and heating and curing the soaked glass fiber through a pultrusion die to finally prepare the self-repairing electrical operation insulating operating rod body.

In the technical scheme, in the step 1, the mass ratio of the urea to the formaldehyde is 1: 1-1: 5.

In the technical scheme, in the step 2, the mass ratio of the epoxy resin to the xylene is 1: 1-4: 1.

In the above technical solution, in the step 2, the epoxy resin is selected from any one or a combination of two or more of bisphenol a epoxy resin, bisphenol F epoxy resin, bisphenol S epoxy resin, hydrogenated bisphenol a epoxy resin, linear phenol formaldehyde epoxy resin, aliphatic glycidyl ether epoxy resin, and tetrabromobisphenol a epoxy resin.

In the technical scheme, in the step 2, the rotating speed is 200-1000 r/min.

In the above technical solution, in the step 3, the curing agent is selected from any one of amine curing agents or a combination of two or more of the amine curing agents.

In the technical scheme, in the step 3, the addition amount of the curing agent is 8-12% of the mass of the epoxy resin.

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

1) the microcapsules are dispersed in the rod body of the insulating operating rod for electrical operation, when the rod body is damaged by external force, the microcapsules can automatically break to release the binder to fill cracks, the cracks are prevented from expanding to achieve the effect of self-repairing, the safe reliability of the rod body of the insulating operating rod for electrical operation is ensured in the transportation and construction processes, and the life safety of electrical operation personnel is greatly ensured;

2) the preparation method of the invention has the advantages of low equipment cost, convenient operation and short preparation period; the raw materials are green and environment-friendly, and the method is suitable for industrial mass production.

Drawings

FIG. 1 is a process flow diagram of the present invention.

Detailed Description

In order to better understand the present invention, the following examples are further provided to illustrate the present invention, but the present invention is not limited to the following examples. Various changes or modifications may be effected therein by one skilled in the art and such equivalents are intended to be within the scope of the invention as defined by the claims appended hereto.

The invention relates to a preparation method of a self-repairing electrician operation insulating operating rod body, which comprises the following steps:

step 1: adding urea and formaldehyde into a three-neck flask, adjusting the pH value to 8-9 by using triethanolamine, heating to 70 ℃, slowly stirring, carrying out heat preservation reaction for 1h to obtain viscous liquid, and forming a stable and transparent urea-formaldehyde prepolymer for later use;

step 2: mixing epoxy resin and dimethylbenzene, adding n-octanol serving as a defoaming agent to obtain a core material emulsion, pouring the core material into a 250ml three-neck flask, slowly dripping the prepolymer obtained in the step 1 into the core material at a slow rotating speed, acidifying with citric acid for 1.5 hours after dripping is finished, adjusting the pH value to 3, and then carrying out constant-temperature curing; filtering the obtained product, washing with acetone and distilled water for 3 times to obtain filter cake, and drying at 30 deg.C for 30min to obtain solid powder as microcapsule;

and step 3: uniformly mixing the microcapsule obtained in the step 2 with epoxy resin and a curing agent, wherein the mass of the microcapsule is 5-20% of the total mass;

and 4, step 4: and (3) soaking the glass fiber with the epoxy resin uniformly mixed with the microcapsule obtained in the step (3), and heating and curing the soaked glass fiber through a pultrusion die to finally prepare the self-repairing electrical operation insulating operating rod body.

In the step 1, the mass ratio of the urea to the formaldehyde is 1: 1-1: 5.

In the step 2, the mass ratio of the epoxy resin to the dimethylbenzene is 1: 1-4: 1.

In step 2, the epoxy resin is selected from any one or a combination of two or more of bisphenol A epoxy resin, bisphenol F epoxy resin, bisphenol S epoxy resin, hydrogenated bisphenol A epoxy resin, linear phenol formaldehyde epoxy resin, aliphatic glycidyl ether epoxy resin and tetrabromobisphenol A epoxy resin.

In the step 2, the rotating speed is 200-1000 r/min.

In step 3, the curing agent is selected from any one of amine curing agents or a combination of two or more of the amine curing agents.

In the step 3, the addition amount of the curing agent is 8-12% of the mass of the epoxy resin.

Example 1

Step 1: adding 12g of urea and 24g of formaldehyde into a three-neck flask, adjusting the pH value to 8-9 by using triethanolamine, heating to 70 ℃, slowly stirring, keeping the temperature and reacting for 1 hour to obtain viscous liquid, and forming a stable and transparent urea-formaldehyde prepolymer for later use.

Step 2: 10g of bisphenol A epoxy resin and 5g of xylene are mixed, and n-octanol serving as a defoaming agent is added to obtain a core material emulsion. Pouring the core material into a 250ml three-neck flask, slowly dropping the prepolymer obtained in the step (1) into the core material at the rotating speed of 400r/min, acidifying with citric acid for 1.5h to adjust the pH value to 3, and then carrying out constant-temperature curing. And (3) carrying out suction filtration on the obtained product, washing the product for 3 times by using acetone and distilled water to obtain a filter cake, and drying the filter cake at the temperature of 30 ℃ for 30min to obtain solid powder which is a microcapsule.

And step 3: uniformly mixing the microcapsule obtained in the step 2 with 500g of bisphenol A type epoxy resin and 50g of diethylenetriamine;

and 4, step 4: and (3) soaking the glass fiber with the epoxy resin uniformly mixed with the microcapsule obtained in the step (3), and heating and curing the soaked glass fiber through a pultrusion die to finally prepare the self-repairing electrical operation insulating operating rod body.

Example 2

Essentially the same as in example 1, except that 12g of urea was mixed with 12g of formaldehyde in step 1.

Example 3

Essentially the same as in example 1, except that 12g of urea was mixed with 36g of formaldehyde in step 1.

Example 4

Essentially the same as in example 1, except that 12g of urea was mixed with 48g of formaldehyde in step 1.

Example 5

Essentially the same as in example 1, except that 10g of the epoxy resin was mixed with 2.5g of xylene in step 2.

Example 6

Essentially the same as in example 1, except that 10g of the epoxy resin was mixed with 7.5g of xylene in step 2.

Example 7

Essentially the same as in example 1, except that 10g of the epoxy resin was mixed with 10g of xylene in step 2.

Example 8

Substantially the same as example 1 except that the epoxy resin species in step 2 is a bisphenol F type epoxy resin.

Example 9

Substantially the same as in example 1 except that the epoxy resin species in step 2 is a hydrogenated bisphenol A type epoxy resin.

Example 10

Basically the same as example 1 except that the epoxy resin species in step 2 is an aliphatic glycidyl ether epoxy resin.

Example 11

The process was substantially the same as in example 1 except that the rotation speed in step 2 was 200 r/min.

Example 12

The process was substantially the same as in example 1 except that the rotation speed in step 2 was 600 r/min.

Example 13

The process was substantially the same as in example 1 except that the rotation speed in step 2 was 800 r/min.

Example 14

Substantially the same as in example 1 except that diethylenetriamine was added in an amount of 40g in step 3.

Example 15

Substantially the same as in example 1 except that the amount of diethylenetriamine added in step 3 was 45 g.

Example 16

Substantially the same as in example 1 except that diethylenetriamine was added in an amount of 55g in step 3.

The resistivity and compressive strength of the insulating operating rod body for self-repairing electrical operation prepared in examples 1 to 16 are shown in table 1 below.

As can be seen from table 1, different ratios of urea to formaldehyde, ratios of epoxy resin to xylene, types of epoxy resin, rotation speeds of the prepolymer added to the core material, and addition amounts of the curing agent are respectively used as variables, and through comparative experiments, it can be seen that the rod bodies of the self-repairing insulating operating rods for electrical work obtained in example 1 have better performance than the grounding modules in examples 2 to 16, wherein the rod bodies of the insulating operating rods for electrical work manufactured in example 1 have a rated bending load of 6kN and a lightning impulse withstand voltage of 380kV, and are better than those of other examples. Thus, example 1 is the preferred embodiment.

The raw materials and equipment used in the invention are common raw materials and equipment in the field if not specified; the methods used in the present invention are conventional in the art unless otherwise specified.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and all simple modifications, alterations and equivalents of the above embodiments according to the technical spirit of the present invention are still within the protection scope of the technical solution of the present invention.