CN114316477B - TPE (thermoplastic elastomer) high-elasticity charging pile cable special material and preparation method thereof - Google Patents

Abstract

The invention belongs to the technical field of electric power facilities, and particularly relates to a special material for a TPE (thermoplastic elastomer) high-elasticity charging pile cable and a preparation method thereof. The product developed by the invention comprises the following raw materials: a thermally conductive filler and a TPE resin; the heat conducting filler is alumina particles; the D50 of the alumina particles is 10-50nm; the surfaces of the aluminum oxide particles are coated with a silane coupling agent; placing 5g of the alumina particles into 100mL of 1mol/L sodium hydroxide solution, stirring at a constant temperature of 25 ℃ and a stirring speed of 200r/min for reaction for 20s, filtering, washing, drying and weighing to obtain filter cake mass Mg; alumina particle mass loss rate Y% = 100% ×m/5; the Y% is 10-30%. The product obtained by the invention can obtain more excellent heat conduction effect under the condition of the same addition amount.

Description

TPE (thermoplastic elastomer) high-elasticity charging pile cable special material and preparation method thereof

Technical Field

The invention belongs to the technical field of electric power facilities. More particularly, relates to a TPE high-elasticity charging pile cable special material and a preparation method thereof.

Background

Along with the popularization of automobiles at present, a large amount of nonrenewable petroleum resources are consumed, and the energy crisis and the further aggravation of environmental pollution are caused, so that various automobile manufacturers invest a great deal of effort in developing new energy automobiles, and along with the continuous popularization and popularization of the new energy automobiles in the future, the new energy automobiles are used as an indispensable component part of the new energy automobiles, namely the charging pile, in the spring of development.

When the new energy automobile is charged rapidly, the new energy automobile is often required to be charged by adopting larger current or voltage, at the moment, the charging pile cable is easy to generate heat because of high voltage and large current, and if the heat cannot be discharged in time, potential safety hazards are generated in the long-term use process.

And because the cable is used, the cable is expected to have better flexibility, so that the cable is convenient to pull. Thermoplastic elastomer (TPE) has the characteristics of plastics and rubber, is a novel polymer material which is developed faster in recent years, and compared with the traditional heat conduction material of a silicon rubber substrate, the heat conduction TPE has more excellent processing performance, does not need to be vulcanized and molded at high temperature, can be processed like plastics by extrusion, injection molding and the like, improves the production efficiency of heat conduction products, and simultaneously greatly reduces the cost of the products because the heat conduction TPE can be recycled.

However, because of the low thermal conductivity of TPEs, it is often necessary to add a large amount of thermally conductive filler to prepare TPEs of higher thermal conductivity. Under the condition of high filling, the elastomer composite material still needs to keep high flexibility and good processability, and is a main technical difficulty for preparing the high-performance heat-conducting TPE.

Disclosure of Invention

The invention aims to solve the technical problems that the existing TPE material has low heat conductivity, and excessive heat conducting filler is required to be introduced when the TPE with high heat conductivity is prepared, so that the rest performances of the product are reduced, and provides a special TPE material for a high-elasticity charging pile cable and a preparation method thereof.

The invention aims to provide a special material for a PVC flexible alloy charging pile cable.

The above object of the present invention is achieved by the following technical scheme:

a TPE high-elasticity charging pile cable special material comprises the following raw materials: a thermally conductive filler and a TPE resin;

the heat conducting filler is alumina particles; the D50 of the alumina particles is 10-50nm;

the surfaces of the aluminum oxide particles are coated with a silane coupling agent;

5g of the alumina particles are put into 100mL of sodium hydroxide solution with the concentration of 1mol/L, and the mixture is stirred at the constant temperature of 25 ℃ and the stirring speed of 200r/min for reaction for 20 seconds, and then filtered, washed, dried and weighed to obtain the quality Mg of a filter cake;

alumina particle mass loss rate Y% = 100% ×m/5;

the Y% is 10-30%.

According to the technical scheme, the aluminum oxide particles subjected to coating treatment by the silane coupling agent are added into the TPE resin system, and the aluminum oxide particles in a specific coating state are further screened out by a sodium hydroxide solution screening mode, because: the inventor finds that in the research process, a single heat conducting filler is added into a resin system, especially an inorganic filler is added into an organic polymer resin system, and the two materials can lead to uneven dispersion of filler particles in the system due to interfacial compatibility, and an obvious interface exists between the heat conducting filler particles and the polymer resin, and the existence of the interface can lead to the formation of a vacuum zone for heat transmission, so that more fillers are needed to be added to compensate, especially the interface problem, and the problem is continuously aggravated along with the continuous extension of the service life in the actual product use process, therefore, the inventor finds that the technical problem can be effectively solved by adopting the filler particles obtained by adopting the screening mode;

however, the inventors found that if the surface of the alumina particles is excessively coated with the silane coupling agent, although the interface between the two is properly solved, the silane coupling agent itself is not a good conductor of heat, which results in a slow transfer of heat between the high molecular polymer body and the alumina particles, and a poor actual improvement effect; of course, if the coating amount is too small, a large amount of exposure of the external interface of the alumina particle surface is also caused; when the particles with the D50 of 10-50nm are selected and the mass loss rate is 10-30% in the sodium hydroxide solution screening, the particles can effectively balance the influences of the alumina particles, the organic polymer body resin and the interface layer thickness of the coupling agent on the actual heat conducting performance of the product after being added into the product, so that the very beneficial heat conducting effect can be obtained under the condition of less adding amount.

Further, the addition amount of the heat conducting filler is Z% of the TPE resin, and the Y% is more than or equal to 5% and less than or equal to 25% of the TPE resin.

According to the technical scheme, the addition amount of the heat conducting filler and the mass loss rate of the alumina particles in the screening process are comprehensively considered in matrix resin, namely TPE resin, and when the mass loss rate is larger, the coating state (coating amount and coating integrity) of the coupling agent on the surfaces of the alumina particles is relatively poor, more addition amount is needed at the moment, and conversely, less addition amount is needed, so that a comparable heat conducting effect can be achieved.

Further, the silane coupling agent is any one of a silane coupling agent KH-550, a silane coupling agent KH-560 and a silane coupling agent KH-570.

Further, the TPE resin is a vinyl chloride TPE resin.

The invention further aims to provide a preparation method of the special material for the PVC flexible alloy charging pile cable.

The above object of the present invention is achieved by the following technical scheme:

a preparation method of a special material for TPE high-elasticity charging pile cables comprises the following specific preparation steps:

pretreatment of alumina particles:

mixing alumina particles and a silane coupling agent, and then ball milling to obtain ball abrasives in different states by controlling processing conditions;

the processing conditions are the proportion of alumina particles and a silane coupling agent or the technological parameters of ball milling;

screening of alumina particles:

5g of the alumina particles are put into 100mL of sodium hydroxide solution with the concentration of 1mol/L, and the mixture is stirred at the constant temperature of 25 ℃ and the stirring speed of 200r/min for reaction for 20 seconds, and then filtered, washed, dried and weighed to obtain the quality Mg of a filter cake;

alumina particle mass loss rate Y% = 100% ×m/5;

alumina particles with Y% of 10-30% are screened out.

Further, the ball milling process parameters are any one or a combination of a plurality of ball milling time, ball milling rotating speed, ball milling temperature and ball material mass ratio.

According to the technical scheme, the proportion of the conditional alumina particles and the silane coupling agent or the technological parameters in the ball milling process are selected in the product preparation process, and the screening process of the sodium hydroxide solution is matched, so that the target alumina particles are obtained through actual adjustment, and the good heat conduction effect can be ensured.

Detailed Description

The present invention is further illustrated below with reference to specific examples, which are not intended to limit the invention in any way. Unless specifically stated otherwise, the reagents, methods and apparatus employed in the present invention are those conventional in the art.

Reagents and materials used in the following examples are commercially available unless otherwise specified.

Example 1

Raw material preparation:

the mass ratio is 10:1, mixing alumina particles and a silane coupling agent, and introducing the mixture into a ball milling tank, wherein the mass ratio of the alumina particles to the silane coupling agent is 15:1 adding zirconia ball milling beads, and controlling different ball milling times under the conditions that the rotation speed is 300r/min, the revolution speed is 200r/min and the temperature is 70 ℃, so as to obtain ball milling materials of different batches, specifically ball milling 5min,10min,15min,20min,25min,30min,35min,40min,45min,50min,55min and 60min, and total ball milling materials of 12 batches; in order to ensure more controllable material screening, a mode of adding more materials into a ball milling tank at one time and discharging the materials in batches after the appointed ball milling time is reached is adopted to obtain the 12 batches of ball grinding materials; the silane coupling agent is a silane coupling agent KH-550; the D50 of the alumina particles is 10nm;

screening of alumina particles:

respectively placing 5g of each of 12 batches of ball milling materials into 12 beakers containing 100mL of 1mol/L sodium hydroxide solution in sequence, stirring at a constant temperature of 25 ℃ and a stirring speed of 200r/min for reaction for 20 seconds, filtering, washing, drying and weighing to obtain the quality Mg of a filter cake;

alumina particle mass loss rate Y% = 100% ×m/5;

screening out alumina particles with Y percent of 10 percent, namely filler particles;

preparation of materials:

blending filler particles and TPE resin according to the adding amount of 5% of the mass of the TPE resin; the TPE resin is vinyl chloride TPE resin;

and then the blended materials are led into a double-screw extruder, extruded, granulated and discharged to obtain the product.

Example 2

Raw material preparation:

the mass ratio is 15:1, mixing alumina particles and a silane coupling agent, and introducing the mixture into a ball milling tank, wherein the ball mass ratio is 16:1 adding zirconia ball milling beads, and under the conditions that the rotation speed is 350r/min, the revolution speed is 250r/min and the ball milling time is 30min, obtaining ball milling materials of different batches, specifically, ball milling materials of 45 ℃,50 ℃,55 ℃,60 ℃,65 ℃,70 ℃,75 ℃,80 ℃ of 8 batches in total by controlling different ball milling temperatures and ball milling and mixing; in order to ensure more controllable material screening, materials with the same quality are respectively added into a ball milling tank, different ball milling temperatures are adopted, and after the ball milling time is reached, the materials are discharged together, so that 8 batches of ball grinding materials are obtained; the silane coupling agent is a silane coupling agent KH-560; the D50 of the alumina particles is 18nm;

screening of alumina particles:

respectively placing 5g of each of 8 batches of ball grinding materials into 8 beakers containing 100mL of 1mol/L sodium hydroxide solution in sequence, stirring at a constant temperature of 25 ℃ and a stirring speed of 200r/min for reacting for 20s, filtering, washing, drying and weighing to obtain the quality Mg of a filter cake;

alumina particle mass loss rate Y% = 100% ×m/5;

screening out alumina particles with Y percent of 20 percent, namely filler particles;

preparation of materials:

blending filler particles and TPE resin according to the adding amount of 10% of the mass of the TPE resin; the TPE resin is vinyl chloride TPE resin;

and then the blended materials are led into a double-screw extruder, extruded, granulated and discharged to obtain the product.

Example 3

Raw material preparation:

mixing alumina particles and a silane coupling agent according to different addition amounts, introducing the mixture into a ball milling tank, and mixing the mixture according to the mass ratio of 18:1 adding zirconia ball milling beads, and carrying out ball milling mixing by controlling the mass ratio of alumina particles to silane coupling agents under the conditions that the rotation speed is 400r/min, the revolution speed is 300r/min and the temperature is 80 ℃ to obtain ball milling materials of different batches, wherein the mass ratio is specifically 10:1,11: 1,12: 1,13: 1,14: 1,15: 1,16: 1,17: 1,18: 1,19: 1,20: 1, ball milling materials of 11 batches in total; in order to ensure that the screening of materials is more controllable, materials with the mass ratio are respectively added into different ball milling tanks, and the same ball milling process parameters are adopted, and the materials are discharged together after the ball milling time is reached; the silane coupling agent is a silane coupling agent KH-570; the D50 of the alumina particles is 50nm;

screening of alumina particles:

respectively placing 5g of each of 11 batches of ball milling materials into 11 beakers containing 100mL of 1mol/L sodium hydroxide solution in sequence, stirring at a constant temperature of 25 ℃ and a stirring speed of 200r/min for reaction for 20 seconds, filtering, washing, drying and weighing to obtain the quality Mg of a filter cake;

alumina particle mass loss rate Y% = 100% ×m/5;

screening out alumina particles with Y percent of 30 percent, namely filler particles;

preparation of materials:

blending filler particles and TPE resin according to the adding amount of 5% of the mass of the TPE resin; the TPE resin is vinyl chloride TPE resin;

and then the blended materials are led into a double-screw extruder, extruded, granulated and discharged to obtain the product.

Example 4

The difference between this embodiment and embodiment 1 is that: in the preparation of the material, the addition amount of filler particles is 8% of the mass of the TPE resin, and the rest conditions are kept unchanged.

Comparative example 1

The difference between this comparative example and example 1 is that: the mass loss rate Y% of the alumina particles was 9%, and the remaining conditions were kept unchanged.

Comparative example 2

The difference between this comparative example and example 1 is that: the mass loss rate Y% of the alumina particles was 31.2%, and the remaining conditions were kept unchanged.

Comparative example 3

The difference between this comparative example and example 1 is that: the D50 of the alumina particles was 8.8nm, the remaining conditions remained unchanged.

Comparative example 4

The difference between this comparative example and example 1 is that: the D50 of the alumina particles was 50.4nm, the remaining conditions remained unchanged.

The products obtained in examples 1 to 4 and comparative examples 1 to 4 were subjected to performance tests, and specific test methods and test results are as follows:

the thermal conductivity was tested according to astm d5470 thermal conductivity test standard, and the specific test results are shown in table 1:

table 1: product performance test results

	Thermal conductivity/W/(m.k)
		Example 1	35.6
Example 2	32.4
		Example 3	33.6
Example 4	31.1
		Comparative example 1	25.6
Comparative example 2	24.5
		Comparative example 3	26.5
Comparative example 4	25.8

As can be seen from the test results in Table 1, the product obtained by the invention has excellent heat conducting property.

The above examples are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above examples, and any other changes, modifications, substitutions, combinations, and simplifications that do not depart from the spirit and principle of the present invention should be made in the equivalent manner, and the embodiments are included in the protection scope of the present invention.

Claims (2)

1. The TPE high-elasticity charging pile cable special material is characterized by comprising the following raw materials: a thermally conductive filler and a TPE thermoplastic elastomer;

the heat conducting filler is alumina particles; the D50 of the alumina particles is 10-50nm;

the surfaces of the aluminum oxide particles are coated with a silane coupling agent;

5g of the alumina particles are put into 100mL of sodium hydroxide solution with the concentration of 1mol/L, and the mixture is stirred at the constant temperature of 25 ℃ and the stirring speed of 200r/min for reaction for 20 seconds, and then filtered, washed, dried and weighed to obtain the quality Mg of a filter cake;

alumina particle mass loss rate Y% = 100% ×m/5;

the Y% is 10-30%;

the addition amount of the heat conducting filler is Z% of the TPE thermoplastic elastomer, and Y% and Z% are less than or equal to 5%;

the silane coupling agent is any one of a silane coupling agent KH-550, a silane coupling agent KH-560 and a silane coupling agent KH-570;

the TPE thermoplastic elastomer is vinyl chloride TPE thermoplastic elastomer.

2. The preparation method of the special TPE high-elasticity charging pile cable material according to claim 1, which is characterized by comprising the following specific preparation steps:

pretreatment of alumina particles:

mixing alumina particles and a silane coupling agent, and then ball milling to obtain ball abrasives in different states by controlling processing conditions;

the processing conditions are the proportion of alumina particles and a silane coupling agent or the technological parameters of ball milling;

screening of alumina particles:

5g of the alumina particles are put into 100mL of sodium hydroxide solution with the concentration of 1mol/L, and the mixture is stirred at the constant temperature of 25 ℃ and the stirring speed of 200r/min for reaction for 20 seconds, and then filtered, washed, dried and weighed to obtain the quality Mg of a filter cake;

alumina particle mass loss rate Y% = 100% ×m/5;

screening out alumina particles with Y percent of 10-30 percent;

the ball milling process parameters are any one or a combination of a plurality of ball milling time, ball milling rotating speed, ball milling temperature and ball material mass ratio.