CN111978813A

CN111978813A - High-strength strain clamp and processing technology thereof

Info

Publication number: CN111978813A
Application number: CN202010789644.9A
Authority: CN
Inventors: 王春余; 王建敏
Original assignee: Hongqi Group Electric Power Fittings Co ltd
Current assignee: Hongqi Group Electric Power Fittings Co ltd
Priority date: 2020-08-07
Filing date: 2020-08-07
Publication date: 2020-11-24

Abstract

The invention relates to the field of wire clamps and discloses a high-strength strain clamp and a processing technology thereof, wherein the high-strength strain clamp comprises a clamp body, the clamp body is treated by a surface treatment agent, and the surface treatment agent comprises the following raw materials in parts by weight: 30-40 parts of urea-formaldehyde resin; 5-8 parts of polycarbonate; 4-5 parts of propylene glycol methyl ether acetate; 2-3 parts of nano zinc oxide; 1-2 parts of a crosslinking agent; 20-30 parts of solvent. The invention has the following advantages and effects: the urea-formaldehyde resin is crosslinked with the mixture of polycarbonate and propylene glycol methyl ether acetate, and then the nano zinc oxide is added, so that on one hand, the dispersibility of the mixed components is improved, the increase of crosslinking sites is facilitated, and the nano zinc oxide is uniformly dispersed, so that the strength is improved; on the other hand, the components are mixed and then have good fluidity when being heated and melted, the formed coating is of a microporous structure, and when the coating is sprayed on the wire clamp body, the coating is firmly combined with the wire clamp body and has good adsorbability, so that the strength of the wire clamp body is stably improved.

Description

High-strength strain clamp and processing technology thereof

Technical Field

The invention relates to the technical field of wire clamps, in particular to a high-strength strain clamp and a processing technology thereof.

Background

The metal accessories made of iron or aluminum widely used for the hardware wire feeding are collectively called as hardware, most hardware needs to bear larger pulling force during operation, and some hardware needs to ensure good electrical contact; the strain clamp is a hardware fitting used for fixing a lead to bear the tension of the lead and hanging the lead to a strain insulator-string group or a tower.

The existing strain clamp is used for connecting a corner, a connection and a terminal, so the stress borne by the strain clamp is larger, the strength of the existing strain clamp cannot meet the requirement, the service life is short, and the strain clamp still needs to be improved.

Disclosure of Invention

Aiming at the defects in the prior art, the invention aims to provide a high-strength strain clamp, which improves the strength of the strain clamp and prolongs the service life of the strain clamp.

The second purpose of the invention is to provide a processing technology of the high-strength strain clamp.

In order to achieve the purpose, the invention provides the following technical scheme:

the utility model provides a high strength strain clamp, includes the fastener body, the fastener body is handled by surface treatment agent, surface treatment agent includes the raw materials of following parts by weight:

30-40 parts of urea-formaldehyde resin;

5-8 parts of polycarbonate;

4-5 parts of propylene glycol methyl ether acetate;

2-3 parts of nano zinc oxide;

1-2 parts of a crosslinking agent;

20-30 parts of solvent.

By adopting the technical scheme, the urea resin is high in curing speed and ideal in coating effect, the polycarbonate and the propylene glycol methyl ether acetate are mixed at high temperature to obtain a mixture with better fluidity, the propylene glycol methyl ether acetate has two polar groups such as alcohol groups, ether groups and the like, the mechanical property of the coating is favorably enhanced, the urea resin is crosslinked with the mixture of the polycarbonate and the propylene glycol methyl ether acetate, and then the nano zinc oxide is added, so that on one hand, the mixture of the polycarbonate and the propylene glycol methyl ether acetate improves the dispersibility of the mixed components, the crosslinking sites are favorably increased, and the nano zinc oxide is uniformly dispersed, so that the strength is improved; on the other hand, the mobility is good when heating the melting after each component mixes, and the coating that forms is microporous structure, when the spraying is on the fastener body, with the combination of fastener body firm, has good adsorptivity, and the inside can not appear bulging, adsorbs more level and smooth, reaches the purpose that stably improves the intensity of fastener body.

The present invention in a preferred example may be further configured to: the raw materials also comprise 4-6 parts of poly dipentaerythritol pentaacrylate according to the parts by weight.

By adopting the technical scheme, the poly dipentaerythritol pentaacrylate has more branched chains, can increase cross-linking sites when being subjected to cross-linking reaction with the urea-formaldehyde resin, and has higher cross-linking density, so that the strength of the coating is enhanced.

The present invention in a preferred example may be further configured to: the raw materials also comprise 3-4 parts of methoxy polyethylene glycol by weight.

Through adopting above-mentioned technical scheme, contain ether and methoxy in the methoxy polyethylene glycol structure, the molecule easily produces the appeal, has higher adhesive strength, helps improving the absorption fastness of coating on the fastener body to play the effect of better reinforcing fastener body intensity.

The present invention in a preferred example may be further configured to: the raw materials also comprise 2-3 parts of polyether acrylate according to parts by weight.

By adopting the technical scheme, the polyether acrylate has low viscosity and good dilutability, and the fluidity of the coating can be improved by properly adding the polyether acrylate, so that the coating can be more uniformly distributed on the wire clamp body, the overall mechanical property of the wire clamp body is favorably improved, the strength of the wire clamp body is stably improved, and the effect is better; the test proves that the polyether acrylate can generate a synergistic effect with the methoxy polyethylene glycol, so that the coating can be stably adsorbed on the wire clamp body, and better fluidity is kept, thereby uniformly and stably improving the strength of the wire clamp body.

The present invention in a preferred example may be further configured to: the raw materials also comprise 0.6 to 0.8 weight portion of chromium oxide.

By adopting the technical scheme, the addition of the chromium oxide plays a role in assisting in enhancing the strength of the coating; meanwhile, the cross-linking curing reaction of the resin can be accelerated, so that the coating can be quickly attached to the wire clamp body.

The present invention in a preferred example may be further configured to: the cross-linking agent is diacetone acrylamide; the solvent is dimethyl ether.

By adopting the technical scheme, the diacetone acrylamide is taken as a cross-linking agent, which is beneficial to enhancing the strength of the coating; dimethyl ether is used as a solvent to improve the dispersibility of each component.

In order to achieve the second object, the invention provides the following technical scheme:

a processing technology of a high-strength strain clamp comprises the following steps:

s1, preparing a surface treating agent; firstly, mixing a solvent and urea-formaldehyde resin, then adding a uniform mixture of polycarbonate and propylene glycol methyl ether acetate, stirring for 15-20min, finally adding nano zinc oxide and a cross-linking agent, heating to 100-120 ℃, and stirring for reaction for 1-1.5h to obtain a surface treating agent;

s2, preprocessing; firstly, ultrasonically cleaning a wire clamp body by using acetone, then carrying out sand blasting roughening treatment, and carrying out preheating treatment at the temperature of 100-;

s3, plasma spraying; the surface treating agent of S1 is sprayed on the surface of the wire clamp body pretreated in S2 by adopting a plasma spraying technology, the spraying distance is 100-.

By adopting the technical scheme, the pretreatment ensures that the plasma spraying effect is better; the wire clamp body is preheated, so that the temperature difference between the wire clamp body and the surface treating agent is not too large during spraying, and the adhesion firmness of the surface treating agent coating can be improved.

The present invention in a preferred example may be further configured to: in the S1, the nano zinc oxide and the chromium oxide can be added together, then the polydipentaerythritol pentaacrylate and the cross-linking agent are added, the temperature is raised to 100 ℃ and 120 ℃, and the stirring reaction is carried out for 1-1.5 h; preserving the temperature, then adding methoxy polyethylene glycol, stirring for 15-20min, then adding polyether acrylate, and stirring for 40-60min to obtain the surface treating agent.

In summary, the invention includes at least one of the following beneficial technical effects:

1. the urea-formaldehyde resin is crosslinked with the mixture of the polycarbonate and the propylene glycol methyl ether acetate, and then the nano zinc oxide is added, so that on one hand, the mixture of the polycarbonate and the propylene glycol methyl ether acetate improves the dispersibility of the mixed components, is beneficial to increasing crosslinking sites, and enables the nano zinc oxide to be uniformly dispersed, thereby improving the strength; on the other hand, the components are mixed and then have good fluidity when being heated and melted, the formed coating is of a microporous structure, and when the coating is sprayed on the wire clamp body, the coating is firmly combined with the wire clamp body and has good adsorbability, so that the strength of the wire clamp body is stably improved;

2. the polydipentaerythritol pentaacrylate has more branched chains, can increase cross-linking sites when being cross-linked with the urea-formaldehyde resin, and has higher cross-linking density, thereby strengthening the strength of the coating;

3. the methoxy polyethylene glycol structure contains ether groups and methoxy groups, molecules are easy to attract, the bonding strength is high, and the adsorption firmness of the coating on the wire clamp body is improved; the polyether acrylate has low viscosity and good dilutability, and the proper addition of the polyether acrylate can improve the fluidity of the coating, so that the coating can be more uniformly distributed on the wire clamp body;

4. the addition of chromium oxide serves to assist in enhancing the strength of the coating; meanwhile, the cross-linking curing reaction of the resin can be accelerated, so that the coating can be quickly attached to the wire clamp body.

Drawings

FIG. 1 is a flow chart of the processing technique of the high-strength strain clamp of the invention.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

In the invention, the urea-formaldehyde resin is purchased from Binshai industry Limited liability company in Henan; polycarbonate, propylene glycol methyl ether acetate and diacetone acrylamide are purchased from Shanghai sugarcane-rich chemical company, Ltd; the nano zinc oxide is purchased from Yongchang chemical industry Co., Ltd, Zhengzhou city; polydipentaerythritol pentaacrylate, methoxy polyethylene glycol, was purchased from Hubei Nonake technologies, Inc.

The raw materials used in the following examples are all available from ordinary commercial sources unless otherwise specified; those who do not specify the conditions are performed according to the conventional conditions or the conditions recommended by the manufacturer.

Examples

Example 1

The invention discloses a high-strength strain clamp and a processing technology thereof, and with reference to fig. 1, the processing technology comprises the following steps:

s1, preparing a surface treating agent; firstly, mixing a solvent and urea-formaldehyde resin, then adding a uniform mixture of polycarbonate and propylene glycol methyl ether acetate, stirring for 15min, finally adding nano zinc oxide and a cross-linking agent, heating to 100 ℃, and stirring for reacting for 1h to obtain a surface treating agent;

s2, preprocessing; firstly, ultrasonically cleaning a wire clamp body by using acetone, then carrying out sand blasting coarsening treatment, and carrying out preheating treatment at 100 ℃ before spraying;

s3, plasma spraying; the surface treating agent of S1 is sprayed on the surface of the wire clamp body pretreated in S2 by adopting a plasma spraying technology, the spraying distance is 100mm, the spraying current is 300A, the main gas flow is 2000L/h, the secondary gas flow is 20L/h, and then the wire clamp body is dried at 150 ℃.

The contents of the components are shown in table 1 below.

Example 2

s1, preparing a surface treating agent; firstly, mixing a solvent and urea-formaldehyde resin, then adding a uniform mixture of polycarbonate and propylene glycol methyl ether acetate, stirring for 20min, finally adding nano zinc oxide and a cross-linking agent, heating to 120 ℃, and stirring for reacting for 1.5h to obtain a surface treating agent;

s2, preprocessing; firstly, ultrasonically cleaning a wire clamp body by using acetone, then carrying out sand blasting coarsening treatment, and carrying out preheating treatment at 120 ℃ before spraying;

s3, plasma spraying; the surface treating agent of S1 is sprayed on the surface of the wire clamp body pretreated in S2 by adopting a plasma spraying technology, the spraying distance is 150mm, the spraying current is 500A, the main air flow is 3000L/h, and the secondary air flow is 40L/h, and then the wire clamp body is dried at the temperature of 200 ℃.

The contents of the components are shown in table 1 below.

Example 3

s1, preparing a surface treating agent; firstly, mixing a solvent and urea-formaldehyde resin, then adding a uniform mixture of polycarbonate and propylene glycol methyl ether acetate, stirring for 18min, finally adding nano zinc oxide and a cross-linking agent, heating to 110 ℃, and stirring for reacting for 1.5h to obtain a surface treating agent;

s2, preprocessing; firstly, ultrasonically cleaning a wire clamp body by using acetone, then carrying out sand blasting roughening treatment, and carrying out preheating treatment at 110 ℃ before spraying;

s3, plasma spraying; the surface treatment agent of S1 is sprayed on the surface of the wire clamp body pretreated in S2 by adopting a plasma spraying technology, the spraying distance is 120mm, the spraying current is 450A, the main gas flow is 2600L/h, and the secondary gas flow is 30L/h, and then the wire clamp body is dried at 180 ℃.

The contents of the components are shown in table 1 below.

Example 4

The invention discloses a high-strength strain clamp and a processing technology thereof, wherein the processing technology comprises the following steps:

s1, preparing a surface treating agent; firstly, mixing a solvent and urea-formaldehyde resin, then adding a uniform mixture of polycarbonate and propylene glycol methyl ether acetate, stirring for 15min, adding nano zinc oxide and chromium oxide, then adding polydipentaerythritol pentaacrylate and a cross-linking agent, heating to 100 ℃, and stirring for reacting for 1 h; preserving heat, then adding methoxy polyethylene glycol, stirring for 15min, then adding polyether acrylate, and stirring for 40min to obtain a surface treating agent;

The contents of the components are shown in the following table 2.

Example 5

s1, preparing a surface treating agent; firstly, mixing a solvent and urea-formaldehyde resin, then adding a uniform mixture of polycarbonate and propylene glycol methyl ether acetate, stirring for 20min, adding nano zinc oxide and chromium oxide, then adding polydipentaerythritol pentaacrylate and a cross-linking agent, heating to 120 ℃, and stirring for reacting for 1.5 h; preserving heat, then adding methoxy polyethylene glycol, stirring for 20min, then adding polyether acrylate, and stirring for 60min to obtain a surface treating agent;

The contents of the components are shown in the following table 2.

Example 6

s1, preparing a surface treating agent; firstly, mixing a solvent and urea-formaldehyde resin, then adding a uniform mixture of polycarbonate and propylene glycol methyl ether acetate, stirring for 18min, adding nano zinc oxide and chromium oxide, then adding polydipentaerythritol pentaacrylate and a cross-linking agent, heating to 110 ℃, and stirring for reacting for 1.5 h; preserving heat, then adding methoxy polyethylene glycol, stirring for 18min, then adding polyether acrylate, and stirring for 50min to obtain a surface treating agent;

The contents of the components are shown in the following table 2.

Example 7

The difference from example 4 is that polydipentaerythritol pentaacrylate was replaced with acrylate and the contents of the respective components are shown in table 2 below.

Example 8

The difference from example 4 is that methoxypolyethylene glycol was replaced by propylene glycol and the amounts of the components are shown in table 2 below.

Example 9

The difference from example 4 is that the polyether acrylate was replaced with stearic acid, and the contents of the respective components are shown in table 2 below.

Example 10

The difference from example 4 is that no chromium oxide is added and the contents of the components are shown in table 2 below.

Comparative example

Comparative example 1

A wire clamp body untreated with the surface treatment agent of the present invention.

Comparative example 2

The difference from example 1 is that the urea resin is replaced with the epoxy resin, and the contents of the respective components are shown in table 1 below.

Comparative example 3

The difference from example 1 is that propylene glycol methyl ether acetate was replaced with a monoacid ester, and the contents of the respective components are shown in table 1 below.

Comparative example 4

The difference from example 1 is that nano zinc oxide is replaced by alumina, and the contents of each component are shown in table 1 below.

Comparative example 5

The difference from example 1 is that the crosslinking agent diacetone acrylamide was replaced with diethylenetriamine, and the contents of the respective components are shown in table 1 below.

TABLE 1 component content tables of examples 1 to 3 and comparative examples 2 to 5

	Example 1	Example 2	Example 3	Comparative example 2	Comparative example 3	Comparative example 4	Comparative example 5
								Urea-formaldehyde resin/epoxy resin	30	40	35	30	30	30	30
Polycarbonate resin	5	8	7	5	5	5	5
								Propylene glycol methyl ether acetate/monoacid ester	4	5	4	4	4	4	4
Nano zinc oxide/alumina	2	3	3	2	2	2	2
								Crosslinking agent	1	2	2	1	1	1	1
Solvent(s)	20	30	25	20	20	20	20

TABLE 2 ingredient content tables for examples 4-10

	Example 4	Example 5	Example 6	Example 7	Example 8	Example 9	Example 10
								Urea-formaldehyde resin	30	40	35	30	30	30	30
Polycarbonate resin	5	8	7	5	5	5	5
								Propylene glycol methyl ether acetate	4	5	4	4	4	4	4
Nano zinc oxide	2	3	3	2	2	2	2
								Crosslinking agent	1	2	2	1	1	1	1
Solvent(s)	20	30	25	20	20	20	20
								Polydipentaerythritol pentaacrylate/acrylate	4	6	5	4	4	4	4
Methoxy polyethylene glycol/propylene glycol	3	4	4	3	3	3	3
								Polyether acrylate/stearic acid	2	3	2	2	2	2	2
Chromium oxide	0.6	0.8	0.7	0.6	0.6	0.6	/

Performance test

1. The strength of the strain clamp is judged through microhardness testing, the testing adopts a pressing-in method, a square cone pressure head with a cone included angle of 136 degrees is used for conducting microhardness testing with a load of 20gf, and a microhardness tester is used for testing microhardness, wherein the higher the microhardness is, the stronger the strength is.

2. The bond strength of the coating was tested directly using an elemeter 106 adhesion tester, with the greater the bond strength, the stronger the adhesion.

The test results are shown in table 3 below.

TABLE 3 component content Table for each example and comparative example

	microhardness/HV	Bonding strength/MPa
			Example 1	310	22.8
Example 2	315	23.1
			Example 3	313	23.0
Example 4	318	24.2
			Example 5	322	24.9
Example 6	320	24.8
			Example 7	227	22.6
Example 8	295	17.3
			Example 9	272	23.0
Example 10	250	24.1
			Comparative example 1	120	/
Comparative example 2	245	22.7
			Comparative example 3	277	20.3
Comparative example 4	280	23.4
			Comparative example 5	293	21.6

In summary, the following conclusions can be drawn:

1. as can be seen from example 1 and comparative example 1 in combination with table 3, the strength of the wire clamp body treated with the surface treatment agent of the present invention was significantly enhanced.

2. As can be seen from example 1 and comparative example 2 in combination with table 3, the strength of the clip body can be effectively improved by using the urea resin according to the present invention.

3. As can be seen from example 1 and comparative example 3 in combination with table 3, the addition of propylene glycol methyl ether acetate is advantageous in improving the strength of the clip body and the adhesion of the coating.

4. As can be seen from example 1 and comparative example 4 in combination with table 3, the addition of nano zinc oxide helps to improve the strength of the clip body.

5. As can be seen from example 1 and comparative example 5 in combination with table 3, the cross-linking agent diacetone acrylamide is effective in improving the strength of the clip body and in improving the adhesion of the coating.

6. According to examples 4 and 7 in combination with Table 3, it can be seen that the addition of the polydipentaerythritol pentaacrylate in the surface treatment agent of the present invention is advantageous in improving the strength of the clip body and suitably improving the adhesion firmness of the coating layer.

7. As can be seen from examples 4 and 8 in combination with table 3, the addition of methoxypolyethylene glycol improves the adhesion strength of the coating formed by the surface treatment agent and thereby further increases the strength of the clip body.

8. As can be seen from examples 4 and 9 in combination with table 3, the addition of polyether acrylate is advantageous in improving the strength of the clip body.

9. As can be seen from examples 4 and 10 in combination with table 3, the addition of chromium oxide helps to improve the strength of the clip body.

The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but is protected by patent law within the scope of the claims of the present invention.

Claims

1. The utility model provides a high strength strain clamp, includes the fastener body, its characterized in that: the wire clamp body is treated by a surface treating agent, and the surface treating agent comprises the following raw materials in parts by weight:

30-40 parts of urea-formaldehyde resin;

5-8 parts of polycarbonate;

4-5 parts of propylene glycol methyl ether acetate;

2-3 parts of nano zinc oxide;

1-2 parts of a crosslinking agent;

20-30 parts of solvent.

2. The high-strength strain clamp of claim 1, wherein: the raw materials also comprise 4-6 parts of poly dipentaerythritol pentaacrylate according to the parts by weight.

3. The high-strength strain clamp of claim 1, wherein: the raw materials also comprise 3-4 parts of methoxy polyethylene glycol by weight.

4. The high strength strain clamp of claim 3, wherein: the raw materials also comprise 2-3 parts of polyether acrylate according to parts by weight.

5. The high-strength strain clamp of claim 1, wherein: the raw materials also comprise 0.6 to 0.8 weight portion of chromium oxide.

6. The high-strength strain clamp of claim 1, wherein: the cross-linking agent is diacetone acrylamide; the solvent is dimethyl ether.

7. The process for processing the high-strength strain clamp of any one of claims 1 to 6, which is characterized by comprising the following steps:

8. The processing technology of the high-strength strain clamp according to claim 7, characterized in that: in the S1, the nano zinc oxide and the chromium oxide can be added together, then the polydipentaerythritol pentaacrylate and the cross-linking agent are added, the temperature is raised to 100 ℃ and 120 ℃, and the stirring reaction is carried out for 1-1.5 h; preserving the temperature, then adding methoxy polyethylene glycol, stirring for 15-20min, then adding polyether acrylate, and stirring for 40-60min to obtain the surface treating agent.