WO2021000519A1

WO2021000519A1 - Phase change heat storage plastic, preparation method therefor and use thereof

Info

Publication number: WO2021000519A1
Application number: PCT/CN2019/123778
Authority: WO
Inventors: 张立强
Original assignee: 力王新材料（惠州）有限公司
Priority date: 2019-07-03
Filing date: 2019-12-06
Publication date: 2021-01-07
Also published as: CN110294895A

Abstract

Disclosed is a phase change heat storage plastic, comprising the following components in parts by weight: 20-50 parts of a plastic and 10-70 parts of a modified phase change powder. Due to same containing the appropriate amount of the modified phase change powder, the plastic has excellent heat absorption and heat storage properties. The enthalpy of the phase change is in the range of 20-200 J/g and the specific heat capacity exceeds 2.3 J/g·K, such that the requirements of batteries and capacitances for heat absorption and heat storage properties are met. The phase change powder has the functions of heat absorption and energy storage. Since the enthalpy value of the phase change is large, the temperature increases slowly, and the plastic can thus absorb more heat. The heat produced by heating dots in batteries and capacitances is rapidly transferred into the phase change heat storage plastic, such that the heating dots are cooled more quickly. The phase change powder is modified by means of a modifying agent, wherein the modifying agent is a powder having a large specific surface area and containing micropores. After mixing same with the modifying agent, the specific surface area thereof is increased. The powder contains numerous micropores, such that the phase change powder enters the micropores and is firmly locked. As a result, the phase change powder is not released from the micropores under high temperature conditions. The heat storage stability and persistence thereof are 4 to 5 times of those of similar products on the market.

Description

Phase change heat storage plastic, preparation method and application thereof

Technical field

The present invention relates to the technical field of thermal storage plastics and preparation methods thereof, in particular to phase change thermal storage plastics, preparation methods and applications thereof.

Background technique

With the miniaturization and light weight of electronic products, it is required to greatly increase the degree of integration. The higher the degree of integration, the more serious the heat dissipation problem. Therefore, in order to prevent the accumulation of heat to form a hot spot, it is necessary to quickly transfer or store the heat of the hot spot. After the product is miniaturized, the internal space becomes more and more narrow. Usually, a plastic shell that transfers heat with a thermally conductive material is used. Without heat storage function, heat saturation will be reached soon, and continuous heat transfer and storage cannot be realized;

For example, a large-capacity lithium battery pack is composed of many lithium battery cells connected in series and parallel. The lithium battery pack generates a lot of heat energy during the charging and discharging process. How to conduct this heat energy to the plastic shell as soon as possible, so that Lithium battery reduces temperature quickly;

Similarly, capacitors are prone to produce a large amount of work for a long time. The more capacitors, the more severe the heat. How to conduct this heat to the plastic case as soon as possible is also an urgent problem in the industry.

In addition, in the field of mobile phone communication equipment, mobile phones will generate a lot of heat during charging and long-term use. How to conduct this heat to the plastic shell as soon as possible is also an urgent problem in the industry.

In addition, in the field of flexible LEDs, there is an urgent need to develop new materials that can store a large amount of heat. For this reason, phase change plastics have appeared on the market. Phase change refers to the process by which a substance changes from one phase to another. The time change is accompanied by the absorption and release of energy, and the phase change of the plastic is used to achieve heat storage. However, in the phase change plastic, if the phase change material is added too little, it will not have a good heat storage effect; if the phase change material Adding too much will increase the brittleness, easy to break during injection molding, and high defect rate.

In addition, electronic product brackets also have higher requirements for heat dissipation and heat storage, and current plastics are also difficult to meet the demand.

In order to solve the above problems, in the prior art, phase change materials are added to plastics. However, the phase change materials will leak at high temperatures, and the phase change materials will be released from the matrix. On the one hand, it will cause subsequent mixing and stirring molding. The difficulty increases. On the other hand, after the phase change material is released, the performance of the phase change heat storage plastic will be greatly reduced, which will affect its heat storage performance.

Therefore, there is an urgent need to provide a phase change heat storage plastic, a preparation method and an application to solve the deficiencies of the prior art.

Summary of the invention

One of the objectives of the present invention is to provide a phase change heat storage plastic to solve the shortcomings of the prior art.

Another object of the present invention is to provide a method for preparing the above-mentioned phase change heat storage plastic.

Another object of the present invention is to provide the application of the above-mentioned phase change heat storage plastic.

In order to achieve the above objectives, the present invention adopts the following technical solutions:

Phase change heat storage plastic, including the following components by weight:

Plastic 20-50 parts and modified phase-change powder 10-70 parts, the preparation method of the modified phase-change powder is as follows: the phase-change powder is heated and melted, and then the modified phase-change powder is added and modified Addition amount is 2%-40% of the phase change powder by weight. After mixing, the powder is kept in a water bath or an oil bath, and then vibrated with a vibrating screen, followed by oil absorption with oil-absorbing paper, and then grinding with a ball mill or sand mill Powder to obtain the modified phase change powder.

Preferably, the modifier is selected from any one or a combination of expanded graphite, nano-silica powder and hollow microsphere powder

Preferably, the plastic is selected from any one or a combination of PP plastic, ABS plastic, PS plastic, PU plastic, PA plastic, and PPS plastic.

Preferably, the phase change powder is selected from any one or a combination of alkane wax, paraffin wax, fatty acid, PE wax and polyethylene glycol

Preferably, 5-40 parts of flame retardant is also included.

Preferably, the flame retardant is selected from any one or a combination of phosphorus flame retardants, nitrogen flame retardants, brominated flame retardants, antimony trioxide and aluminum hydroxide.

Preferably, the alkane carbon number of the alkane wax is between 10-60.

In the above-mentioned preparation method of the phase change heat storage plastic, the components are weighed according to the formula, and then the phase change material is added into the plastic, and the phase change heat storage plastic is obtained by injection molding.

In the application of the above-mentioned phase change heat storage plastic, the said phase change heat storage plastic can be used in the area of batteries, electronic product supports and shells.

Compared with the prior art, the phase change heat storage plastic of the present invention has the following beneficial effects: the phase change heat storage plastic of the present invention contains an appropriate amount of phase change powder, the phase change enthalpy ranges from 20 to 200 J/g, and the specific heat capacity exceeds It is 2.3J/g·K, which meets the needs of batteries and capacitors for heat absorption and heat storage performance. Phase change powder has the function of heat absorption and energy storage. Due to the large phase change enthalpy value and slow heating, the plastic can absorb more The heat generated by the heating point in the battery and capacitor is quickly transferred to the phase change heat storage plastic, so that the heating point cools faster, which can solve the technical problem of heating in the battery and capacitor field; the phase change powder passes through Modifier modification. The modifier is a powder with a large specific surface area and micropores. After mixing with it, the specific surface area is increased. The powder contains a large number of micropores. The phase change powder enters the micropores and is firmly locked. It will not dissociate from the micropores under high temperature conditions. This solves the problem of phase change heat storage rubber oiling. It not only improves the operability of the subsequent molding process, but more importantly, it can greatly ensure Under high temperature conditions, it can maintain the stability of heat storage performance for a long time. Compared with similar products, its heat storage stability and sustainability are 4-5 times that of similar products on the market. Even if used for a long time, the heat storage performance will decrease. Not more than 2-3%.

Detailed ways

The present invention will be further explained below in conjunction with the embodiments, which is a preferred embodiment of the present invention.

Example 1

The phase change heat storage plastic includes the following components by weight: 20 parts of PP plastic and 30 parts of the modified phase change powder. The preparation method of the modified phase change powder is as follows: heating 20 carbon atom paraffin wax After melting, add expanded graphite to the molten 20-carbon alkane wax. The weight ratio is 2% of the 20-carbon alkane wax. After mixing, the powder is kept in a water bath or an oil bath, and then vibrated with a vibrating screen for more than 4 hours. Then use oil-absorbing paper to absorb oil, and then use a ball mill or sand mill to grind the powder to obtain the modified phase change powder.

Example 2

The phase change heat storage plastic includes the following components by weight: 50 parts of PA plastic and 70 parts of modified phase change powder.

The preparation method of the modified phase change powder is as follows: heat and melt the PE wax, and then add nano-silica powder to the melted PE wax, the addition amount is 40% by weight of the PE wax, and the powder is placed in a water bath after mixing. Or heat preservation in an oil bath, then vibrate with a vibrating screen for more than 4 hours, then absorb oil with oil-absorbing paper, and then grind the powder with a ball mill or a sand mill to obtain the modified phase change powder.

Example 3

The phase change heat storage plastic includes the following components by weight: 35 parts of ABS plastic and 50 parts of modified phase change powder.

The preparation method of the modified phase change powder is as follows: the polyethylene glycol is heated and melted, and then expanded graphite is added to the melted polyethylene glycol. The added amount is 5% by weight of the polyethylene glycol. The body is kept warm in a water bath or an oil bath, and then vibrated with a vibrating screen for more than 4 hours, then oil is absorbed with oil-absorbing paper, and then the powder is ground with a ball mill or a sand mill to obtain the modified phase change powder.

Example 4

The phase change heat storage plastic includes the following components by weight: 50 parts of PP plastic and 50 parts of modified phase change powder.

The preparation method of the modified phase change powder is as follows: heat and melt the PE wax, and then add nano-silica powder to the melted PE wax, the addition amount is 10% by weight of the PE wax, and the powder is placed in a water bath after mixing. Or heat preservation in an oil bath, then vibrate with a vibrating screen for more than 4 hours, then absorb oil with oil-absorbing paper, and then grind the powder with a ball mill or a sand mill to obtain the modified phase change powder.

Example 5

The phase change heat storage plastic includes the following components by weight: 40 parts of PP plastic and 30 parts of modified phase change powder.

The preparation method of the modified phase change powder is as follows: heating and melting the 10 carbon atom alkane wax, and then adding hollow microsphere powder to the molten 10 carbon atom alkane wax, and the addition amount is the weight ratio of the 10 carbon atom alkane wax 40%, after mixing, the powder is kept warm in a water bath or an oil bath, and then vibrated with a vibrating screen for more than 4 hours, followed by oil absorption with oil-absorbing paper, and then grinding the powder with a ball mill or a sand mill to obtain the modified phase change powder .

Example 6

The phase change heat storage plastic includes the following components by weight: 40 parts of PP plastic, 30 parts of modified phase change powder, and 20 parts of nitrogen-based flame retardant.

The preparation method of the modified phase change powder is as follows: heating and melting the 10-carbon alkane wax, and then adding nano-expanded graphite to the molten 10-carbon alkane wax, and the addition weight ratio is 16% of the 10-carbon alkane wax After mixing, the powder is kept warm in a water bath or an oil bath, and then vibrated with a vibrating screen for more than 4 hours, followed by oil absorption with oil-absorbing paper, and then grinding the powder with a ball mill or a sand mill to obtain the modified phase change powder.

Example 7

The phase change heat storage plastic includes the following components by weight: 40 parts of PP plastic, 20 parts of modified phase change powder, and 20 parts of aluminum hydroxide.

The preparation method of the modified phase change powder is as follows: heat and melt the 60-carbon alkane wax, and then add hollow microsphere powder to the melted 60-carbon alkane wax, and the weight ratio of the 60-carbon alkane wax is added. 6%, after mixing, the powder is kept warm in a water bath or an oil bath, and then vibrated with a vibrating screen for more than 4 hours, followed by oil absorption with oil-absorbing paper, and then grinding the powder with a ball mill or a sand mill to obtain the modified phase change powder

Example 8

The phase change heat storage plastic includes the following components by weight: 20 parts of PP plastic, 30 parts of modified phase change powder, and 30 parts of nitrogen-based flame retardant.

The preparation method of the modified phase change powder is as follows: the fatty acid is heated and melted, and then nano-silica powder is added to the melted fatty acid at a weight ratio of 18% of the fatty acid. After mixing, the powder is placed in a water bath or an oil bath. In medium heat preservation, vibrate with a vibrating screen for more than 4 hours, and then absorb oil with oil-absorbing paper, and then grind the powder with a ball mill or a sand mill to obtain the modified phase change powder.

Example 9

The phase change thermal storage plastic includes the following components by weight: 50 parts of PP plastic, 60 parts of modified phase change powder, and 20 parts of phosphorus flame retardant.

The preparation method of the modified phase change powder is as follows: heating and melting the 20-carbon alkane wax, and then adding hollow microsphere powder to the molten 20-carbon alkane wax, and the addition amount is the 20-carbon alkane wax. 18%, after mixing, the powder is kept warm in a water bath or an oil bath, and then vibrated with a vibrating screen for more than 4 hours, followed by oil absorption with oil-absorbing paper, and then grinding the powder with a ball mill or a sand mill to obtain the modified phase change powder .

Example 10

The phase change heat storage plastic includes the following components by weight: 30 parts of PA plastic, 30 parts of modified phase change powder, and 20 parts of phosphorus flame retardant.

The preparation method of the modified phase change powder is as follows: heating and melting the 60-carbon alkane wax, and then adding nano-silica powder to the molten 60-carbon alkane wax, and the addition weight ratio is the 60-carbon alkane wax 40%, after mixing, the powder is kept warm in a water bath or an oil bath, and then vibrated with a vibrating screen for more than 4 hours, followed by oil absorption with oil-absorbing paper, and then grinding the powder with a ball mill or a sand mill to obtain the modified phase change powder .

Example 11

The preparation method of the modified phase change powder is as follows: the fatty acid is heated and melted, and then hollow microsphere powder is added to the melted fatty acid at a weight ratio of 20% of the fatty acid. After mixing, the powder is placed in a water bath or an oil bath. In medium heat preservation, vibrate with a vibrating screen for more than 4 hours, and then absorb oil with oil-absorbing paper, and then grind the powder with a ball mill or a sand mill to obtain the modified phase change powder.

Example 12

The phase change heat storage plastic includes the following components by weight: 38 parts by weight of PA plastic, 35 parts of modified phase change powder, and 18 parts of aluminum hydroxide.

Example 13

The phase change heat storage plastic includes the following components by weight: 25 parts of ABS plastic, 32 parts of modified phase change powder, and 12 parts of aluminum hydroxide.

The preparation method of the modified phase change powder is as follows: heat and melt the paraffin, and then add hollow microsphere powder to the melted paraffin. The added amount is 28% by weight of the paraffin. After mixing, the powder is placed in a water bath or an oil bath. In medium heat preservation, vibrate with a vibrating screen for more than 4 hours, and then absorb oil with oil-absorbing paper, and then grind the powder with a ball mill or a sand mill to obtain the modified phase change powder.

Example 14

The phase change heat storage plastic includes the following components in parts by weight: 25 parts by weight of ABS plastic, 12 parts by 30-carbon paraffin wax, and 12 parts by aluminum hydroxide.

The preparation method of the modified phase change powder is as follows: heating and melting the 30-carbon alkane wax, and then adding nano-silica powder to the melted 30-carbon alkane wax, and the addition weight ratio is 30-carbon alkane wax. 38%, after mixing, the powder is kept warm in a water bath or an oil bath, and then vibrated with a vibrating screen for more than 4 hours, followed by oil absorption with oil-absorbing paper, and then grinding the powder with a ball mill or a sand mill to obtain the modified phase change powder .

Example 15

The phase change heat storage plastic includes the following components in parts by weight: 25 parts of ABS plastic, 32 parts of modified phase change powder, 12 parts of aluminum hydroxide, 4 parts of graphite.

Example 16

The phase change heat storage plastic includes the following components by weight: 35 parts of ABS plastic, 35 parts of modified phase change powder, and 15 parts of aluminum hydroxide.

The preparation method of the modified phase change powder is as follows: heat and melt the paraffin, then add nano-silica powder to the melted paraffin, the addition amount is 28% by weight of the paraffin, and the powder is placed in a water bath or an oil bath after mixing In medium heat preservation, vibrate with a vibrating screen for more than 4 hours, and then absorb oil with oil-absorbing paper, and then grind the powder with a ball mill or a sand mill to obtain the modified phase change powder.

Example 17

The phase change heat storage plastic includes 35 parts of ABS plastic, 35 parts of modified phase change powder and 15 parts of aluminum hydroxide in the following parts by weight.

Example 18

The preparation method of the modified phase change powder is as follows: the fatty acid is heated and melted, and then nano-silica powder is added to the melted fatty acid at a weight ratio of 30% of the fatty acid. After mixing, the powder is placed in a water bath or an oil bath. In medium heat preservation, vibrate with a vibrating screen for more than 4 hours, and then absorb oil with oil-absorbing paper, and then grind the powder with a ball mill or a sand mill to obtain the modified phase change powder.

Example 19

The phase change thermal storage plastic includes the following components by weight: 40 parts of PS plastic, 30 parts of modified phase change powder, and 10 parts of phosphorus flame retardant.

Example 20

The preparation method of the modified phase change powder is as follows: heating and melting the 20-carbon alkane wax, and then adding nano-silica powder to the molten 20-carbon alkane wax, and the addition weight ratio is the 20-carbon alkane wax 36%, after mixing, the powder is kept warm in a water bath or an oil bath, and then vibrated with a vibrating screen for more than 4 hours, followed by oil absorption with oil-absorbing paper, and then grinding the powder with a ball mill or a sand mill to obtain the modified phase change powder .

Example 21

The preparation method of the modified phase change powder is as follows: heating and melting the fatty acid, and then adding expanded graphite to the melted fatty acid at a weight ratio of 12% of the fatty acid. After mixing, the powder is kept in a water bath or an oil bath. Then vibrate with a vibrating screen for more than 4 hours, then absorb oil with oil-absorbing paper, and then grind the powder with a ball mill or a sand mill to obtain the modified phase change powder.

Example 22

The phase change heat storage plastic includes the following components by weight: 55 parts of PS plastic, 33 parts of modified phase change powder, and 15 parts of aluminum hydroxide.

The preparation method of the modified phase change powder is as follows: heat and melt the paraffin, and then add hollow microsphere powder to the melted paraffin. The addition amount is 35% by weight of the paraffin. After mixing, the powder is placed in a water bath or an oil bath. In medium heat preservation, vibrate with a vibrating screen for more than 4 hours, and then absorb oil with oil-absorbing paper, and then grind the powder with a ball mill or a sand mill to obtain the modified phase change powder.

Example 23

The phase change heat storage plastic includes the following components by weight: 45 parts of PS plastic, 33 parts of alkane wax with 20 carbon atoms, and 15 parts of nitrogen-based flame retardant.

The preparation method of the modified phase change powder is as follows: heating and melting the 20-carbon alkane wax, and then adding nano-silica powder to the molten 20-carbon alkane wax, and the addition weight ratio is the 20-carbon alkane wax 16%, after mixing, the powder is kept in a water bath or an oil bath, and then vibrated with a vibrating screen for more than 4 hours, followed by absorption of oil with oil-absorbing paper, and then grinding the powder with a ball mill or a sand mill to obtain the modified phase change powder .

Example 24

Phase change heat storage plastic includes the following components by weight: 50 parts PS plastic, 33 parts fatty acid, 15 parts aluminum hydroxide.

Example 25

The phase change heat storage plastic includes the following components by weight: 20 parts of PP plastic, 5 parts of ABS plastic, 32 parts of paraffin wax, and 12 parts of aluminum hydroxide.

Example 26

The phase change heat storage plastic includes the following components by weight: 20 parts of PP plastic, 5 parts of ABS plastic, 42 parts of modified phase change powder, and 12 parts of aluminum hydroxide.

Example 27

The phase change heat storage plastic includes the following components by weight: 20 parts of PP plastic, 5 parts of ABS plastic, 32 parts of modified phase change powder, and 12 parts of phosphorus flame retardant.

The preparation method of the modified phase change powder is as follows: heating and melting the fatty acid, and then adding expanded graphite to the melted fatty acid at a weight ratio of 5% of the fatty acid. After mixing, the powder is kept in a water bath or an oil bath. Then vibrate with a vibrating screen for more than 4 hours, then absorb oil with oil-absorbing paper, and then grind the powder with a ball mill or a sand mill to obtain the modified phase change powder.

Example 28

The phase change heat storage plastic includes the following components by weight: 30 parts of PP plastic, 20 parts of ABS plastic, 40 parts of modified phase change powder, and 30 parts of aluminum hydroxide.

The preparation method of the modified phase change powder is as follows: heat and melt the paraffin, then add hollow microsphere powder to the melted paraffin, the added amount is 25% by weight of the paraffin, and the powder is placed in a water bath or an oil bath after mixing In medium heat preservation, vibrate with a vibrating screen for more than 4 hours, and then absorb oil with oil-absorbing paper, and then grind the powder with a ball mill or a sand mill to obtain the modified phase change powder.

Example 29

The phase change heat storage plastic includes the following components by weight: 40 parts of PP plastic, 10 parts of ABS plastic, 40 parts of 20-carbon paraffin wax, and 30 parts of aluminum hydroxide.

The preparation method of the modified phase change powder is as follows: heating and melting the 20-carbon alkane wax, and then adding nano-silica powder to the molten 20-carbon alkane wax, and the addition weight ratio is the 20-carbon alkane wax 8%, after mixing, the powder is kept warm in a water bath or an oil bath, and then vibrated with a vibrating screen for more than 4 hours, followed by oil absorption with oil-absorbing paper, and then grinding the powder with a ball mill or a sand mill to obtain the modified phase change powder .

Example 30

The phase change heat storage plastic includes the following components by weight: 20 parts of PP plastic, 20 parts of ABS plastic, 40 parts of modified phase change powder, and 30 parts of aluminum hydroxide.

The preparation method of the modified phase change powder is as follows: the fatty acid is heated and melted, and then nano-silica powder is added to the melted fatty acid at a weight ratio of 40% of the fatty acid. After mixing, the powder is placed in a water bath or an oil bath. In medium heat preservation, vibrate with a vibrating screen for more than 4 hours, and then absorb oil with oil-absorbing paper, and then grind the powder with a ball mill or a sand mill to obtain the modified phase change powder.

Example 31

The phase change heat storage plastic includes the following components by weight: 20 parts of PP plastic, 30 parts of ABS plastic, 30 parts of modified phase change powder, and 20 parts of phosphorus flame retardant.

Example 32

The phase change heat storage plastic includes the following components by weight: 10 parts of PP plastic, 30 parts of ABS plastic, 30 parts of modified phase change powder, and 20 parts of nitrogen-based flame retardant.

The preparation method of the modified phase change powder is as follows: the polyethylene glycol is heated and melted, and then nano expanded graphite is added to the molten polyethylene glycol, and the addition weight ratio is 16% of the polyethylene glycol. The powder is kept warm in a water bath or an oil bath, and then vibrated with a vibrating screen for more than 4 hours, followed by oil absorption with oil-absorbing paper, and then grinding the powder with a ball mill or a sand mill to obtain the modified phase change powder.

Example 33

Phase change heat storage plastics include 5 parts of PP plastic, 45 parts of ABS plastic, 45 parts of polyethylene glycol, and 22 parts of aluminum hydroxide in the following parts by weight.

Example 34

The phase change heat storage plastic includes the following components by weight: 25 parts of PU plastic, 32 parts of modified phase change powder, and 12 parts of aluminum hydroxide.

The preparation method of the modified phase change powder is as follows: heating and melting the paraffin, and then adding expanded graphite to the molten paraffin at a weight ratio of 2% of the paraffin. After mixing, the powder is kept in a water bath or an oil bath. Then vibrate with a vibrating screen for more than 4 hours, then absorb oil with absorbent paper, and then grind the powder with a ball mill or a sand mill to obtain the modified phase change powder.

Example 35

The phase change heat storage plastic includes the following components by weight: 25 parts of PU plastic, 12 parts of modified phase change powder, and 12 parts of aluminum hydroxide.

Example 36

The phase change heat storage plastic includes the following components in parts by weight: 25 parts of PU plastic, 32 parts of modified phase change powder, 12 parts of aluminum hydroxide, and 4 parts of graphite.

Example 37

The phase change heat storage plastic includes the following components by weight: 35 parts of PU plastic, 35 parts of modified phase change powder, and 15 parts of aluminum hydroxide.

The preparation method of the modified phase change powder is as follows: heating and melting the paraffin, and then adding expanded graphite to the molten paraffin, the addition amount is 8% by weight of the paraffin, and the powder is kept in a water bath or an oil bath after mixing. Then vibrate with a vibrating screen for more than 4 hours, then absorb oil with oil-absorbing paper, and then grind the powder with a ball mill or a sand mill to obtain the modified phase change powder.

Example 38

Phase change heat storage plastics include 35 parts of PU plastic, 35 parts of modified phase change powder and 15 parts of aluminum hydroxide in the following parts by weight.

Example 39

Example 40

The phase change heat storage plastic includes the following components by weight: 25 parts of PPS plastic, 32 parts of modified phase change powder, and 12 parts of aluminum hydroxide.

Example 41

The phase change heat storage plastic includes the following components in parts by weight: 25 parts of PPS plastic, 12 parts of modified phase change powder, and 12 parts of brominated flame retardant.

Example 42

The phase change heat storage plastic includes the following components in parts by weight: 25 parts of PPS plastic, 32 parts of modified phase change powder, 12 parts of antimony trioxide, and 4 parts of graphite.

Example 43

The phase change heat storage plastic includes the following components by weight: 35 parts of PPS plastic, 35 parts of modified phase change powder, and 15 parts of aluminum hydroxide.

Example 44

The phase change heat storage plastic includes the following components in parts by weight: 35 parts of PPS plastic, 35 parts of modified phase change powder, and 15 parts of antimony trioxide.

The preparation method of the modified phase change powder is as follows: the preparation method of the modified phase change powder is as follows: heating and melting the 20-carbon alkane wax, and then adding nano silica to the molten 20-carbon alkane wax Micropowder, the weight ratio of addition is 26% of the 20 carbon atom paraffin wax. After mixing, the powder is kept in a water bath or an oil bath, and then vibrated with a vibrating screen for more than 4 hours, then oil is absorbed with oil-absorbing paper, and then ground with a ball mill or a sand mill Powder to obtain the modified phase change powder.

Example 45

The preparation method of the modified phase change powder is as follows: the fatty acid is heated and melted, and then nano-silica powder is added to the melted fatty acid at a weight ratio of 22% of the fatty acid. After mixing, the powder is placed in a water bath or an oil bath. In medium heat preservation, vibrate with a vibrating screen for more than 4 hours, and then absorb oil with oil-absorbing paper, and then grind the powder with a ball mill or a sand mill to obtain the modified phase change powder.

Example 46

The preparation method of phase change heat storage plastic includes the following steps. Weigh the components according to the formula,

The phase change material is added into the plastic, and the injection molding is used to obtain the required phase change heat storage plastic.

Example 47

The application of the phase change heat storage plastic described in Examples 1-45. The phase change heat storage plastic can be used in batteries, electronic product supports and shell areas.

The application of the phase change heat storage plastics described in Examples 1-12 to the battery field has been tested for performance. The test results of various indicators are shown in Table 1. The test performance at the same ambient temperature is as follows (1.0mm):

Table 1

The application of the phase change heat storage plastics described in Examples 12-45 in the battery field has been tested for performance. The test results of various indicators are shown in Table 2. The test performance under the same ambient temperature is as follows (1.0mm):

Table 2

The phase-change heat storage plastics of Examples 1-12 are applied to batteries, and non-phase-change plastics are applied to batteries. After injection molding of the phase-change plastics, 10 18650 batteries are tested and compared. The results are shown in Table 3. Show:

table 3

The above battery cell test results show that the phase change material can significantly reduce the temperature of the battery cell during operation, and the average temperature can reach about 16°C;

From the data in Table 1 to Table 3, it is known that the phase change enthalpy (J/g) of the phase change heat storage plastic of the present invention is greater than 20-200, and the endothermic value is high; the phase change temperature (℃) is 25～90; the specific heat capacity (J/g) /(g·K))≥2.3; the specific gravity (g/cc) has reached 0.8～1.5, and when the addition amount of phase change powder increases, the specific heat capacity and phase change enthalpy also increase, with a higher phase The variable enthalpy and larger specific heat capacity, the heat absorption and heat storage performance are also more excellent, which can explain that the combined application of phase change powder makes the plastic have surprising heat absorption enthalpy and specific heat capacity, and other properties The index has also been enhanced, with an unexpected enhancement effect. After testing, it is found that the specific heat capacity increases as the amount of phase change powder added increases.

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the protection scope of the present invention. Although the present invention has been described in detail with reference to preferred embodiments, those of ordinary skill in the art should understand The technical solution of the present invention can be modified or equivalently replaced without departing from the essence and scope of the technical solution of the present invention.

Claims

The phase change heat storage plastic is characterized by comprising the following components by weight:

Plastic 20-50 parts and modified phase-change powder 10-70 parts, the preparation method of the modified phase-change powder is as follows: the phase-change powder is heated and melted, and then the modified phase-change powder is added and modified Addition amount is 2%-40% of the phase change powder by weight. After mixing, the powder is kept in a water bath or an oil bath, and then vibrated with a vibrating screen, followed by oil absorption with oil-absorbing paper, and then grinding with a ball mill or sand mill Powder to obtain the modified phase change powder.
The phase change heat storage plastic according to claim 1, wherein the modifier is selected from any one or a combination of expanded graphite, nano silica powder and hollow microsphere powder.
The phase change heat storage plastic according to claim 1, wherein the plastic is selected from any one or a combination of PP plastic, ABS plastic, PS plastic, PU plastic, PA plastic, and PPS plastic.
The phase change thermal storage plastic according to claim 1, wherein the phase change powder is selected from any one or a combination of alkane wax, paraffin wax, fatty acid, PE wax and polyethylene glycol.
The phase change heat storage plastic according to claim 2, characterized in that it further comprises 5-40 parts of flame retardant.
The phase change heat storage plastic according to claim 5, wherein the flame retardant is selected from the group consisting of phosphorus flame retardants, nitrogen flame retardants, brominated flame retardants, antimony trioxide and aluminum hydroxide Any one or a combination of several.
The phase change heat storage plastic according to claim 4, wherein the alkane carbon number of the alkane wax is between 10-60.
The method for preparing a phase change thermal storage plastic according to any one of claims 1-7, wherein the components are weighed according to the formula, then the modified phase change material is added to the plastic, and the plastic is injection molded to obtain the Phase change heat storage plastic.
The application of the phase change heat storage plastic according to any one of claims 1-7, wherein the phase change heat storage plastic can be used in batteries, electronic product supports and shell areas.