Electrical porcelain cementing agent

Abstract

The application discloses an electric porcelain cement adhesive and belongs to the technical field of electric porcelain. The electric porcelain cement adhesive comprises the following raw materials in percentage by weight: silicate cement: 40-55%; quartz sand: 35-45%; modified polycarboxylic acid water reducing agent: 0.4-0.6%; defoaming agent: 0.1-0.3%; and water: 9-15%. The modified polycarboxylic acid water reducing agent prepared in the application has excellent dispersing performance and greatly improves the adsorption amount on the surface of cement particles; the durability of the cement adhesive is enhanced; the prepared cement adhesive has the advantages of high early strength, sufficient later strength, high bending strength and high compressive strength.

Description

Technical Field

[0001] This invention belongs to the field of electrical porcelain technology, and specifically relates to an electrical porcelain cement adhesive. Background Technology

[0002] With my country's rapid economic growth and continuous development of power construction, long-span, long-distance, low-loss, and ultra-high-voltage transmission lines have been rapidly popularized. Large porcelain insulators, which play a crucial role in power transmission and transformation projects, are increasingly widely used. Insulators are indispensable insulating equipment in power systems, primarily serving mechanical connection and electrical insulation functions. As a vital step in the insulator manufacturing process, the adhesive bonding of insulators is receiving increasing attention. The quality of the cement adhesive used for insulator bonding is an extremely important factor, directly affecting the quality of the insulators and consequently the entire power transmission and transformation project.

[0003] Cement adhesive is a crucial component of electrical porcelain products, primarily used in suspension and post-type insulators. It serves to bond porcelain components to metal fittings, directly determining the overall strength and performance of the electrical porcelain product, just like the porcelain components and metal fittings themselves. However, current cement adhesives suffer from drawbacks such as poor flowability, hindering worker application; low early-stage strength; and insufficient later-stage strength. Furthermore, to ensure bonding strength, traditional cement adhesives require a very large amount of cement, resulting in high costs. Summary of the Invention

[0004] The purpose of this invention is to provide an electrical porcelain cement adhesive to solve the problem of poor mechanical strength of cement adhesives.

[0005] The objective of this invention can be achieved through the following technical solutions:

[0006] An electrical porcelain cement adhesive, comprising the following raw materials by weight percentage:

[0007] Silicate cement: 40-55%;

[0008] Quartz sand: 35-45%;

[0009] Modified polycarboxylate superplasticizer: 0.4-0.6%;

[0010] Defoamer: 0.1-0.3%;

[0011] Water: 9-15%;

[0012] The modified polycarboxylate superplasticizer is prepared through the following steps:

[0013] S1. Add dopamine, 3-chloro-2-hydroxypropyltrimethylammonium chloride, and anhydrous ethanol to deionized water, disperse by ultrasonication, adjust the pH to 9.5-10.5 with ammonia, stir at 55℃, filter under vacuum, wash, and dry to obtain an intermediate; then add the intermediate, methoxyphenol, and N-hydroxymethylacrylamide to deionized water, adjust the pH to 7.5-8.5, stir at 65℃ for 0.5-1 h, filter, wash, and vacuum dry to obtain modified dopamine;

[0014] S2. Add ethylene glycol monovinyl polyethylene glycol ether, modified dopamine, and H2O2 to deionized water and stir at 35-40℃ to obtain a premix. Add acrylic acid, chain transfer agent, and ascorbic acid to deionized water and stir to obtain solution A. Add initiator to deionized water and stir to obtain solution B. Add solutions A and B to the premix, keep warm for 1-2 hours under N2 atmosphere, adjust the pH to 6-7 with sodium hydroxide solution, and dry to a solid content of 40% to obtain modified polycarboxylate superplasticizer.

[0015] Furthermore, the particle size of the quartz sand is 20-50 mesh.

[0016] Furthermore, the quartz sand contains ≤8% 20-mesh particles and ≤15% 50-mesh particles.

[0017] Furthermore, the chain transfer agent mentioned in S2 is one of 2-mercaptoethanol and 3-mercaptopropionic acid.

[0018] Furthermore, the initiator mentioned in S2 is one of potassium persulfate and ammonium persulfate.

[0019] Furthermore, in S1, the ratio of dopamine, 3-chloro-2-hydroxypropyltrimethylammonium chloride, anhydrous ethanol, and deionized water is 1 g: 1.5 mL: 20 mL: 30 mL; and the ratio of intermediate, methoxyphenol, N-hydroxymethylacrylamide, and deionized water is 0.5 g: 0.05 g: 0.8-1 g: 10 mL.

[0020] Furthermore, in the S2 premix, the ratio of ethylene glycol monovinyl polyethylene glycol ether, modified dopamine, H2O2, and deionized water is 1g:0.1-0.3g:0.09-0.12mL:30mL; in solution A, the ratio of acrylic acid, chain transfer agent, ascorbic acid, and deionized water is 4g:0.6g:0.09-0.12g:100mL; and in solution B, the ratio of initiator to deionized water is 0.6g:30mL.

[0021] Furthermore, the electrical porcelain cement adhesive is prepared through the following steps:

[0022] Step 1: Weigh each raw material according to its weight percentage;

[0023] Step 2: Add silicate cement and quartz sand to the mixer and stir until uniform. Add water-reducing agent, defoamer and water to the mixer and stir until uniform to obtain electrical porcelain cement adhesive.

[0024] The beneficial effects of this invention are:

[0025] The modified polycarboxylate superplasticizer prepared in this invention is synthesized by modifying dopamine with quaternary ammonium salt and converting the phenolic hydroxyl groups on dopamine into double bonds, followed by free radical polymerization with acrylic acid and ethylene glycol monovinyl polyethylene glycol ether. This process produces a modified polycarboxylate superplasticizer with micro-crosslinking and high intrinsic viscosity. The modified polycarboxylate superplasticizer of this invention can significantly reduce the plastic viscosity and yield stress of silicate cement, effectively reduce the amount of water required for mixing cement adhesive dry powder, improve the mechanical strength of cement adhesive, and enhance its durability. Furthermore, the modified polycarboxylate superplasticizer does not release irritating gases during use, has a higher water reduction rate, higher water sensitivity, and is more environmentally friendly and safe.

[0026] The addition of defoamer in this invention can also reduce the air bubbles generated during the mixing process of cementitious adhesive, eliminate most of the large air bubbles and abnormal air bubbles inside the solidified body, and further improve the impermeability and durability of the cementitious adhesive. The cementitious adhesive prepared by this invention has excellent properties such as good compactness, high strength, and good durability, and is easy to put into large-scale production. Detailed Implementation

[0027] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0028] Example 1

[0029] This embodiment provides a modified dopamine:

[0030] 1 g of dopamine, 1.5 mL of 3-chloro-2-hydroxypropyltrimethylammonium chloride, and 20 mL of anhydrous ethanol were added to 30 mL of deionized water and ultrasonically dispersed for 20 min. The pH of the solution was adjusted to 10 with ammonia water, and the mixture was heated and stirred in a water bath at 55 °C for 8 h. After vacuum filtration, the mixture was washed twice with anhydrous ethanol and deionized water, and dried to obtain an intermediate. Then, 0.5 g of the intermediate, 0.05 g of methoxyphenol, and 0.8 g of N-hydroxymethylacrylamide were added to 10 mL of deionized water, the pH was adjusted to 8, and the mixture was heated to 65 °C for 0.5 h. After filtration, the mixture was washed three times with ethyl acetate and ethanol, and dried under vacuum at 40 °C for 24 h to obtain modified dopamine.

[0031] Example 2

[0032] This embodiment provides a modified polycarboxylate superplasticizer:

[0033] 1g of ethylene glycol monovinyl polyethylene glycol ether, 0.1g of modified dopamine, and 0.09mL of H2O2 were added to 30mL of deionized water, and the mixture was heated to 35℃ and stirred to obtain a premix. 4g of acrylic acid, 0.6g of 2-mercaptoethanol, and 0.09g of ascorbic acid were added to 100mL of deionized water to obtain solution A. 0.6g of potassium persulfate was added to 30mL of deionized water and stirred until homogeneous to obtain solution B. Solutions A and B were added to the premix, and the mixture was kept at a constant temperature for 2 hours under a N2 atmosphere. The pH was adjusted to 7 with sodium hydroxide solution (30wt%), and the mixture was dried until the solid content was 40% to obtain the modified polycarboxylate superplasticizer.

[0034] Example 3

[0035] This embodiment provides a modified polycarboxylate superplasticizer:

[0036] 1g of ethylene glycol monovinyl polyethylene glycol ether, 0.2g of modified dopamine, and 0.1mL of H2O2 were added to 30mL of deionized water, and the mixture was heated to 40℃ and stirred to obtain a premix. 4g of acrylic acid, 0.6g of 3-mercaptopropionic acid, and 0.09g of ascorbic acid were added to 100mL of deionized water to obtain solution A. 0.6g of potassium persulfate was added to 30mL of deionized water and stirred until homogeneous to obtain solution B. Solutions A and B were added to the premix, and the mixture was kept at a constant temperature for 2 hours under a N2 atmosphere. The pH was adjusted to 7 with sodium hydroxide solution (30wt%), and the mixture was dried until the solid content was 40% to obtain the modified polycarboxylate superplasticizer.

[0037] Example 4

[0038] This embodiment provides a modified polycarboxylate superplasticizer:

[0039] 1g of ethylene glycol monovinyl polyethylene glycol ether, 0.3g of modified dopamine, and 0.1mL of H2O2 were added to 30mL of deionized water, and the mixture was heated to 40℃ and stirred to obtain a premix. 4g of acrylic acid, 0.6g of 3-mercaptopropionic acid, and 0.1g of ascorbic acid were added to 100mL of deionized water to obtain solution A. 0.6g of ammonium persulfate was added to 30mL of deionized water and stirred until homogeneous to obtain solution B. Solutions A and B were added to the premix, and the mixture was kept at a constant temperature for 2 hours under a N2 atmosphere. The pH was adjusted to 7 with sodium hydroxide solution (30wt%), and the mixture was dried until the solid content was 40% to obtain the modified polycarboxylate superplasticizer.

[0040] Comparative Example 1

[0041] The only difference from Example 2 is that:

[0042] 1g of ethylene glycol monovinyl polyethylene glycol ether and 0.09mL of H2O2 were added to 30mL of deionized water, and the mixture was heated to 35℃ and stirred to obtain a premix. 4g of acrylic acid, 0.6g of 2-mercaptoethanol, and 0.09g of ascorbic acid were added to 100mL of deionized water to obtain solution A. 0.6g of potassium persulfate was added to 30mL of deionized water and stirred until homogeneous to obtain solution B. Solutions A and B were added to the premix, and the mixture was kept at a constant temperature for 2 hours under a N2 atmosphere. The pH was adjusted to 7 with sodium hydroxide solution (30wt%), and the mixture was dried until the solid content was 40% to obtain the polycarboxylate superplasticizer.

[0043] Example 5

[0044] This embodiment provides an electrical porcelain cement adhesive, comprising the following by weight percentage:

[0045] Silicate cement (grade 525): 45%; Quartz sand (20-50 mesh): 42%; Modified polycarboxylate superplasticizer: 0.4%; Defoamer (model: D130, Shanghai Yungan Industrial Co., Ltd.): 0.1%; Water: 12.5%;

[0046] The preparation method of the electrical porcelain cement adhesive includes the following steps:

[0047] Add silicate cement and quartz sand to a mixer and mix until uniform. Add water-reducing agent, defoamer and water to the mixer and mix until uniform to obtain electrical porcelain cement adhesive.

[0048] Example 6

[0049] The only difference from Example 5 is that:

[0050] Silicate cement (grade 525): 50%; Quartz sand (20-50 mesh): 40%; Modified polycarboxylate superplasticizer: 0.5%; Defoamer (model: D130, Shanghai Yungan Industrial Co., Ltd.): 0.1%; Water: 9.4%.

[0051] Example 7

[0052] The only difference from Example 5 is that:

[0053] Silicate cement (grade 525): 53%; Quartz sand (20-50 mesh): 36%; Modified polycarboxylate superplasticizer: 0.6%; Defoamer (model: D130, Shanghai Yungan Industrial Co., Ltd.): 0.1%; Water: 10.3%.

[0054] Comparative Example 2

[0055] Compared to Example 5, the modified polycarboxylate superplasticizer in Example 5 was replaced with the polycarboxylate superplasticizer in Comparative Example 1, while the other raw materials and steps were the same as in Example 5.

[0056] Comparative Example 3

[0057] Compared with Example 5, the quartz sand (20-50 mesh) in Example 5 was replaced with quartz sand (10-20 mesh), and the other raw materials and steps were the same as in Example 5.

[0058] Compression and flexural strength tests were conducted on Examples 5-7 and Comparative Example 2 using the test methods outlined in the national standard JB / T 4307-2004, "Cement Adhesives for Insulator Installation". The test results are shown in Tables 1-2.

[0059]

[0060]

[0061] As can be seen from Tables 1-2, the cement adhesive prepared by this invention has excellent flexural strength and compressive strength; and after being subjected to a high temperature of 120℃ for 5 days, the cement adhesive still has high flexural strength and compressive strength, which also indicates that the cement adhesive prepared by this invention has excellent durability.

[0062] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0063] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A cement adhesive for electrical porcelain, characterized in that, By weight, it includes the following raw materials: Silicate cement: 40-55%; Quartz sand: 35-45%; Modified polycarboxylate superplasticizer: 0.4-0.6%; Defoamer: 0.1-0.3%; Water: 9-15%; The modified polycarboxylate superplasticizer is prepared through the following steps: S1. Add dopamine, 3-chloro-2-hydroxypropyltrimethylammonium chloride, and anhydrous ethanol to deionized water, disperse by ultrasonication, adjust the pH to 9.5-10.5 with ammonia, stir at 55℃, filter under vacuum, wash, and dry to obtain an intermediate; then add the intermediate, methoxyphenol, and N-hydroxymethylacrylamide to deionized water, adjust the pH to 7.5-8.5, stir at 65℃ for 0.5-1 h, filter, wash, and vacuum dry to obtain modified dopamine; S2. Add ethylene glycol monovinyl polyethylene glycol ether, modified dopamine, and H2O2 to deionized water and stir at 35-40℃ to obtain a premix. Add acrylic acid, chain transfer agent, and ascorbic acid to deionized water and stir to obtain solution A. Add initiator to deionized water and stir to obtain solution B. Add solutions A and B to the premix, keep warm for 1-2 hours under N2 atmosphere, adjust the pH to 6-7 with sodium hydroxide solution, and dry to a solid content of 40% to obtain modified polycarboxylate superplasticizer.

2. The electrical porcelain cement adhesive according to claim 1, characterized in that, The particle size of the quartz sand is 20-50 mesh.

3. The electrical porcelain cement adhesive according to claim 2, characterized in that, The quartz sand contains ≤8% 20-mesh particles and ≤15% 50-mesh particles.

4. The electrical porcelain cement adhesive according to claim 1, characterized in that, The chain transfer agent is one of 2-mercaptoethanol and 3-mercaptopropionic acid.

5. The electrical porcelain cement adhesive according to claim 1, characterized in that, The initiator is one of potassium persulfate and ammonium persulfate.

6. The electrical porcelain cement adhesive according to claim 1, characterized in that, In S1, the ratio of dopamine, 3-chloro-2-hydroxypropyltrimethylammonium chloride, anhydrous ethanol, and deionized water is 1 g: 1.5 mL: 20 mL: 30 mL; the ratio of intermediate, methoxyphenol, N-hydroxymethylacrylamide, and deionized water is 0.5 g: 0.05 g: 0.8-1 g: 10 mL.

7. The electrical porcelain cement adhesive according to claim 1, characterized in that, In S2 premix, the ratio of ethylene glycol monovinyl polyethylene glycol ether, modified dopamine, H2O2, and deionized water is 1g:0.1-0.3g:0.09-0.12mL:30mL; in solution A, the ratio of acrylic acid, chain transfer agent, ascorbic acid, and deionized water is 4g:0.6g:0.09-0.12g:100mL; and in solution B, the ratio of initiator to deionized water is 0.6g:30mL.

8. The electrical porcelain cement adhesive according to claim 1, characterized in that, The electrical porcelain cement adhesive is prepared through the following steps: Step 1: Weigh each raw material according to its weight percentage; Step 2: Add silicate cement and quartz sand to the mixer and stir until uniform. Add water-reducing agent, defoamer and water to the mixer and stir until uniform to obtain electrical porcelain cement adhesive.

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