CN1202201C - Microcapsulation heat absorbing particle - Google Patents

Abstract

The present invention relates to a microencapsulation heat absorbing particle capable of being easily stored and radiating heat. Heat absorbing particles can be sprayed and coated on the surface of article so as to achieve the purpose of absorbing a large amount of heat. The heat absorbing particle is the tiny microencapsulation particle having the particle diameter of 1 to 1000 mu m. The particle comprises an outer casing and a core substance, wherein the outer casing is a high molecular polymer selected from melamine formaldehyde, urea formaldehyde resin, PU and acryl, and the core substance is a heat absorbing substance selected from straight-chain alkane, high-grade alcohol and an organic acid substance having the fusing point about 35 DEG C to 70 DEG C. The weight ratio of the outer casing to the core substance is about 1/20 to 1/2.

Description

Micro encapsulation heat absorption particle and manufacture method

Technical field

The invention relates to a kind of micro encapsulation heat absorption particle and manufacture method, its surface that can coat metal or non-metallic member provides heat radiation function, also can add dyestuff to provide outside the heat radiation function and to be application pigment.

Background technology

" pigment " broad sense means a kind of coloured particulate matter, it is present among the mediator with stabile physical property and chemical, interpolation raw material as toning processing, its range of application is quite extensive, for example as the toning processing additive of making processing procedures such as paint, coating, printing ink, weaving, papermaking, leather, plastic cement, rubber, resin, glass, so the use of pigment is as good as the life that makes us and has increased many colors on every side.

Paint, the use of coating in life be the most extensive, most of as color that increases article surface and the anti-oxidation usefulness of secluding air, but, this kind purposes but is not suitable for being used in most radiating component, because being coated on the surface of radiating component, paint, coating can reduce heat conduction efficiency, so most radiating component all is exposed among the air with original material, therefore be the material (as iron) of easy oxidation if this radiating component uses, the situation of corrosion then takes place easily, and the relative efficient that has also reduced heat radiation of corrosion and the life-span of product.

Present computer assembly, electronic product element or machinework etc., it can continue to produce undesired heat in the process of work running, so can be provided with on the element that in equipment, generates heat usually as radiating components such as fan, radiator element, heat pipes, in the hope of quickening the heat that dissipation equipment is produced, but along with the innovation of product usefulness improves, above-mentioned all heats that equipment produced such as grade also increase severely with day, temperature even up to more than 100 ℃, so if do not develop the higher heat abstractor of radiating efficiency, too high temperature potential must cause bad influence to equipment.

General material has the performance of two kinds of different kenels for heat, and one be sensible heat, and soon heat energy shows on the variation of temperature; One is latent heat, is about to the variation that heat energy is used for phase; And be materials such as copper, aluminium in the used radiating component major part of equipment such as computer assembly, electronic product element or machinework, store sensible heat by radiator element, increase efficient with air heat exchange via the mode with the air contact area of strengthening again, when the speed of heat exchange during, promptly reach the effect of heat radiation greater than the power of thermal source output.

In sum, for making body surface increase the diversity of its antioxidant effect and color, with paint or coating in addition the coating meeting be the road that wherein solves, but so can influence original radiating effect again, heat dissipation metal member particularly, therefore, if radiating component or general a kind of color that not only increases in appearance of shell can be provided, in fact but still not influencing even improve the coating coating of its radiating efficiency, will certainly be the processing mode of killing two birds with one stone.

Summary of the invention

Main purpose of the present invention is to provide a kind of micro encapsulation heat absorption particle and manufacture method, and it is to store concurrent heat dissipation capacity easily, and the heat absorption particle can be sprayed on the body surface, to reach the purpose that absorbs a large amount of heats.

Another object of the present invention is to provide a kind of slightly drape heat conduction medium materials of tool intensity, removing to increase the radiating efficiency that the member aesthetic property can improve member again.

The manufacture method of a kind of micro encapsulation heat absorption of the present invention particle is characterized in that, comprising:

Get 60 parts of trimeric cyanamides, 60 ℃ of formaldehyde 37%, 150 parts and 290 parts of heating of water became the prepolymer aqueous solution in one hour;

Getting 100 parts of fused tetradecyl alcohols and 0.3 part of dyestuff mixes mutually until dissolving or resize ratio fully on demand;

Above-mentioned painted liquid tetradecyl alcohol is added in 5 parts of emulsifying agents and the 50 parts of PVP20% aqueous solution, stir into emulsion;

Emulsion is added 60 ℃ of melamine formaldehyde resin prepolymer heated in water solution and continues stir about 2 hours;

The microcapsule filtration drying of after the termination reaction reaction being finished forms the heat absorption particle.

Also comprise and get 30 parts of microcapsule, 70 parts in epoxy-vibrin or resize ratio on demand, after disperseing through high-temperature fusion, cool off, pulverize, be sprayed on metal or the non-metallic objectsit is not a metal object surface with the corona electrostatic gun.

A kind of micro encapsulation heat absorption of the present invention particle, it is that a kind of core material directly is the micro encapsulation fine particle of 1-1000 μ m, particle is formed and is comprised shell and core matter, shell for from melamino-formaldehyde, urea formaldehyde resins, PU, and acrylic acid high molecular polymer make, core matter be a kind of be selected from melting point 35 ℃-70 ℃ straight chain alkane, higher alcohols, and the thermal absorption material of organic acidic material made, the weight ratio of shell and core matter is 1/20-1/2, it is characterized in that wherein micro encapsulation heat absorption particle is by following method manufacturing:

Get 60 parts of trimeric cyanamides, 60 ℃ of one hour one-tenth preparation prepolymer aqueous solution of 290 parts of heating of 37%150 parts in formaldehyde and water;

Getting 100 parts of fused tetradecyl alcohols and 0.3 part of dyestuff mixes mutually until dissolving or resize ratio fully on demand;

Above-mentioned painted liquid tetradecyl alcohol is added in 5 parts of emulsifying agents and the 50 parts of PVP20% aqueous solution, stir into emulsion;

Emulsion is added 60 ℃ of melamine formaldehyde resin prepolymer heated in water solution and continues stir about 2 hours;

The microcapsule filtration drying of after the termination reaction reaction being finished forms the heat absorption particle.

Description of drawings

The following cooperation with reference to accompanying drawing describes in detail and can more understand other features and advantages of the present invention, wherein:

Fig. 1 is preparation of the present invention and spraying schema;

Fig. 2 is the gauge point distribution plan of aluminium flake to be measured.

Embodiment

Heat absorption particle of the present invention (heat-absorbing particle) is the micro encapsulation fine particle of 1-1000 μ m for a kind of core particle diameter, particle is formed and is comprised shell and core matter, shell is a kind of melamino-formaldehyde that is selected from, urea formaldehyde resins, PU, and acrylic acid high molecular polymer, core matter is that a kind of fusing point that is selected from is about 35 ℃-70 ℃ straight chain alkane, higher alcohols, and the thermal absorption material of organic acidic material, the about 1/20-1/2 of the weight ratio of shell and core matter, core matter can add dyestuff (dye) and become the pigment (pigment) with color heat absorption in addition, that is heat absorption particle herein (heat-absorbing particle) is for comprising or do not comprise the common name of dyestuff (dye), and heat-absorbing pigment (heat-absorbing pigrment) then refers to comprise dyestuff (dye).

Shown in Figure 1 be the present invention the absorb heat preparation and the spraying method of particle, mainly be to utilize the thermal absorption material that stores concurrent heat dissipation capacity easily, earlier with its dyeing (step S10), do micro encapsulation then and handle the pigment (being heat-absorbing pigment of the present invention) that (step S12) forms fine particle, use as coating in the middle of making an addition to mediator (step S14) again, it can be sprayed at body surface (step S16) and form one deck coating, and a coloured heat dissipating layer so is provided, and increases aesthetic property and improves radiating efficiency again.

The thermal absorption material that forms heat absorption particle core matter can be a kind of phase change material, required energy in the time of absorbing heat as its phase change, belong to latent heat thermmal storage material, include materials such as straight chain alkane, higher alcohols, organic acid, as mentioned above, wherein special best results with paraffin, docosane, tetracosane, tetradecyl alcohol, hexadecanol, stearyl alcohol, laurostearic acid, TETRADECONIC ACID, palmitic acid; When thermal absorption absorbed heat, temperature can be sluggish in molten some for some time of phase change material, so when the thermal absorption material is added on radiating component, thermal source produces being absorbed by the thermal absorption material that main heat can be very fast, and can be fast with thermal transpiration to air, reduce thermal source effectively and produce main heat.

Dyeing as for the thermal absorption material, select the dyestuff compatible for it with its character, make the thermal absorption material form the tool particular color and handle to do further micro encapsulation, its granular size of thermal absorption material of process micro encapsulation can reach several μ m, uses as pigment to be suitable as to make an addition in the mediator.

Above-mentioned mediator is for helping the attached work of pigment microcapsule in the adhesive of body surface, it can be resenes such as epoxy type, polyester resin, and be good with epoxy-vibrin, get the pigment microcapsule and the epoxy-alkyd resin of suitable proportion, through can be used as coating after the high-temperature fusion dispersion, be sprayed at the corona electrostatic gun on the surface of radiating component, can form the coating layer of the certain intensity of a tool.

Please refer to Fig. 1, the present invention is the detailed preparation and the spraying flow process (the thermal absorption material is selected tetradecyl alcohol for use, and mediator is selected epoxy-vibrin for use) as described below of an example wherein:

1, gets 60 parts of trimeric cyanamides, 60 ℃ of one hour one-tenth prepolymer aqueous solution of 290 parts of heating of (37%) 150 part in formaldehyde and water.

2, getting 100 parts of fused tetradecyl alcohols and 0.3 part of dyestuff mixes mutually until dissolving (resize ratio on demand) (step S10) fully.

3, above-mentioned painted liquid tetradecyl alcohol is added in 5 parts of emulsifying agents and 50 parts of PVP (20%) aqueous solution, stir into emulsion.

4, emulsion was added 60 ℃ of melamine formaldehyde resin prepolymer heated in water solution and lasting stir about 2 hours.

5, the microcapsule filtration drying of after the termination reaction reaction being finished, the particle that obtains is heat-absorbing pigment of the present invention.

6, get 30 parts of microcapsule, epoxy-vibrin 70 parts (resize ratios on demand) and disperse through high-temperature fusion after, cool off, pulverize (step S14), be sprayed on metal or the non-metallic objectsit is not a metal object body surface (step S16) with the corona electrostatic gun.

Utilize the present invention, can form one deck coated face at any body surface, because this coated face is formed by the thermoset material, so have certain intensity and stationarity, and heat-absorbing pigment is wherein being played the part of the function of heat absorption, heat release, really can reach the effect that reduces the object heat, in addition, also heat-absorbing pigment can be sprayed at casing than big area position (as the notebook computer shell), with thermal conductive wire or conducting strip the heat of pyrotoxin (as CPU) is led toward this coating layer then, can reach the effect that helps heat radiation equally.In addition, also can make thermal absorption material no dyeing and preserve primary colors and implemented, further, the particle that more can maintenances natural colored absorbs heat is added in the mediator of interpolation dyestuff, the particle that maybe will absorb heat is sneaked into and is mixed spraying in the general coating, can improve the purpose of object radiating efficiency equally.Please understand heat absorption particle of the present invention and can utilize the additive method preparation, and heat absorption particle of the present invention can utilize other suitable modes to be coated on body surface.The present invention can be applicable to the heat radiating material of computer heat radiation base material and shell machinery; Electric parts, heat radiating material and shell; Auto parts, heat radiating material and shell or the like.

For confirming that the present invention has gain property utterly really to the radiating efficiency of equipment, now the present invention is made heat absorption particle is sprayed on 10 μ m * 10mm aluminium flake, and set up several measurement point (as shown in Figure 2) separately, simulate CPU and make its residing 30 ℃ of envrionment temperatures with the heat block of 10.8W, and with one spraying heat absorption particle aluminium flake in contrast, its result shows the aluminium flake that sprays the heat absorption particle, and its surface temperature is certain to be low (testing aluminium flake with shown in the test result that contrasts aluminium flake as table 1) than the aluminium flake temperature that does not spray the heat absorption particle.

Table 1

Measuring temperature ℃ control group experimental group

(not having the coating heat-absorbing paint) (the coating heat-absorbing paint is arranged)

Heating piece 70.1 43.45

T1 60.0 40.8

T2 64.8 43.0

T3 56.7 39.6

T4 53.8 38.1

T5 52.6 36.9

T6 51.6 36.4

T7 51.4 36.4

T8 51.6 36.5

B1 61.2 42.1

B3 57.4 40.1

B4 54.6 38.6

B5 52.5 36.8

B6 50.5 36.3

B7 51.8 36.4

B8 51.5 36.2

Wherein: T1-T8: the aluminium sheet upper surface

B1-B8: aluminium sheet lower surface

In sum, the present invention really can promote the radiating effect of object, is sprayed at the appearance of radiating component, increases and provide the diversity of product color, breaks through the shortcoming of radiating component colouring back heat sinking function difference, also can be sprayed at the equipment casing as the usefulness that helps heat radiation.

Claims (3)

1. the manufacture method of a micro encapsulation heat absorption particle is characterized in that, comprising:

Get 60 parts of trimeric cyanamides, 60 ℃ of formaldehyde 37%, 150 parts and 290 parts of heating of water became the prepolymer aqueous solution in one hour;

Getting 100 parts of fused tetradecyl alcohols and 0.3 part of dyestuff mixes mutually until dissolving or resize ratio fully on demand;

Above-mentioned painted liquid tetradecyl alcohol is added in 5 parts of emulsifying agents and the 50 parts of PVP20% aqueous solution, stir into emulsion;

Emulsion is added 60 ℃ of melamine formaldehyde resin prepolymer heated in water solution and continues stir about 2 hours;

The microcapsule filtration drying of after the termination reaction reaction being finished forms the heat absorption particle.

2. according to the manufacture method of the described micro encapsulation of claim 1 heat absorption particle, it is characterized in that, also comprise and get 30 parts of microcapsule, 70 parts in epoxy-vibrin or resize ratio on demand, after the high-temperature fusion dispersion, cool off, pulverize, be sprayed on metal or the non-metallic objectsit is not a metal object surface with the corona electrostatic gun.

3. micro encapsulation heat absorption particle, it is that a kind of core material directly is the micro encapsulation fine particle of 1-1000 μ m, particle is formed and is comprised shell and core matter, shell for from melamino-formaldehyde, urea formaldehyde resins, PU, and acrylic acid high molecular polymer make, core matter be a kind of be selected from melting point 35 ℃-70 ℃ straight chain alkane, higher alcohols, and the thermal absorption material of organic acidic material made, the weight ratio of shell and core matter is 1/20-1/2, it is characterized in that wherein micro encapsulation heat absorption particle is by following method manufacturing:

Get 60 parts of trimeric cyanamides, 60 ℃ of one hour one-tenth preparation prepolymer aqueous solution of 290 parts of heating of 37%150 parts in formaldehyde and water;

Getting 100 parts of fused tetradecyl alcohols and 0.3 part of dyestuff mixes mutually until dissolving or resize ratio fully on demand;

Above-mentioned painted liquid tetradecyl alcohol is added in 5 parts of emulsifying agents and the 50 parts of PVP20% aqueous solution, stir into emulsion;

Emulsion is added 60 ℃ of melamine formaldehyde resin prepolymer heated in water solution and continues stir about 2 hours;

The microcapsule filtration drying of after the termination reaction reaction being finished forms the heat absorption particle.

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