KR100972667B1 - Polypropylene compound composition having quality of heat stroage and radiation, and its products - Google Patents

Abstract

PURPOSE: A polypropylene composition is provided to prevent the damage of electronic products by quickly absorbing, storing, and emitting heat which is generated from the electronic products and to extend the lifespan of the electronic product by reducing fluctuation of thermal load. CONSTITUTION: A polypropylene composition includes 10~50 parts by weight of a rubber and 10~80 parts by weight of wax based on 100.0 parts by weight of the polypropylene. The rubber is a nitrile butadiene rubber or a styrene butadiene rubber. The wax is composed of paraffin wax having a melting point of 30~100 °C. A method for manufacturing polypropylene products comprises the following steps: putting the paraffin wax and rubber into the polypropylene and mixing the materials for 30 minutes using a super mixer; obtaining pellets by extruding the mixed material in a twin extruder; and obtaining a desired product by extruding and injecting the pellets.

Description

POLYPROPYLENE COMPOUND COMPOSITION HAVING QUALITY OF HEAT STROAGE AND RADIATION, AND ITS PRODUCTS}

The present invention relates to a polypropylene composition having heat storage and releasing properties, and more particularly, to 10 parts by weight of nitrile butadiene rubber (NBR) or styrene butadiene rubber (SBR) in 100 parts by weight of thermoplastic polypropylene, and paraffin. It is a composition composed of 10 to 80 parts by weight of wax or paraffin chloride, but the use thereof is not particularly limited. However, if the performance is deteriorated due to the exothermic action in the use environment, it has the property of properly absorbing and storing heat and discharging the battery. It can be used for cases, laptop cases, heat sinks, etc.

In general, when a synthetic resin composition has a low melting point or a material having low compatibility with each other when mixed with each other when melted, the mechanical properties such as compressive strength and flexural strength deteriorate.

Especially in the case of straight chain hydrocarbon mixture called paraffin wax, melting point is 48 ~ 66 ℃, but it can be subdivided into melting zone through distillation recrystallization process depending on the use. Such paraffin wax is absorbed and released as it melts and solidifies. The change was analyzed by differential scanning calorimetry and it was 210J / g, which is a phase change material with very high calorific value. In addition, the purified paraffin wax is a transparent colorless liquid when melted, does not exhibit odor, adhesiveness and lubricity and is used as a release agent, coating agent, varnish, electrical insulator and the like. Synthetic paraffin wax obtained by converting coal gas into hydrocarbon has been used as a modifier of synthetic resin such as polyethylene.

By using the phase change characteristic of paraffin wax, it can absorb and store the heat generated in the 48 ~ 66 ℃ range and can be used as a heat storage material having the characteristic of being released, but it is difficult to apply to synthetic resin because of its low compatibility.

The paraffin wax has a melting point of 50 ° C. or higher than a general thermoplastic resin, and has a low viscosity and good flowability when melted, and has a lubricating property. Therefore, a large amount of paraffin wax could not be incorporated into the synthetic resin composition.

In particular, the extruder's temperature is heated above the melting point of the resin during extrusion or injection.However, even if the extruder's temperature is only 70 ° C, the paraffin wax loses its viscosity and flows into a highly fluid liquid. It was not possible to mix the wax.

In order to solve the above problems, a method of mixing paraffin wax with nitrile butadiene rubber (NBR) or styrene butadiene rubber (SBR) was used. Most rubbers have a very good ability to absorb oil, especially synthetic rubber nitrile butadiene rubber (NBR) and styrene butadiene rubber (SBR), which can absorb up to 120% by weight.

Using nitrile butadiene rubber (NBR) or styrene butadiene rubber (SBR), nitrile butadiene rubber (NBR) or styrene butadiene rubber (SBR) is added to the supermixer, and paraffin wax is added. Paraffin wax is dissolved in butadiene rubber (NBR) or styrene butadiene rubber (SBR).

In addition, synthetic resins are compatible with rubber materials such as nitrile butadiene rubber (NBR) and styrene butadiene rubber (SBR), so that the rubber in which paraffin wax is dissolved can be mixed with polypropylene and extruded or extruded compound.

When the product using the polypropylene composition according to the present invention described above is excessively exothermic due to the use of electric and electronic products such as a motor, a mobile phone, a notebook, and is restricted in use, the generated heat is quickly absorbed and stored. This prevents damage to the device and limits on its use, as well as reducing the intensity of fluctuations in thermal loads, helping to prolong the life of the device and product. For example, when a polypropylene product is exposed to nature, it is heated and heated during the day when solar heat is affected, but it is cooled at night.In the case of paraffin wax, the temperature of the polypropylene during the day is absorbed by paraffin wax to absorb and store heat. At this time, the molten paraffin wax is solidified at night and releases heat, which increases the cooling period. Therefore, the heating and cooling periods are delayed, and the temperature variation can be almost eliminated when the capacity of paraffin wax is increased, thereby preventing the degradation of the properties of polypropylene due to repeated thermal loads.

Paraffin wax rubber was added to polypropylene, and then stirred vigorously with a super mixer for 30 minutes, and then extruded and pelletized in a twin extruder. The obtained pellet was extruded and injected to obtain a desired product.

Example 1

40 parts by weight of styrene butadiene rubber (SBR), 40 parts by weight of paraffin wax, and 20 parts by weight of talc were added to 100 parts by weight of polypropylene resin, and the mixture obtained by vigorous stirring in a supermixer for 30 minutes was pelletized by a twin extruder. In addition, the result of measuring the physical properties of the pellets obtained through this process using the specimen injection machine was as follows.

Flow index ashes(%) Izod impact strength
kgf / cm importance The tensile strength
MPa
% Elongation Flexural strength
MPa
Modulus
MPa Hardness 37 8 12.9 0.98 160 558 104 8000 27

Example 2

 In addition, 100 parts by weight of polypropylene resin, 60 parts by weight of styrene-butadiene rubber (SBR), 30 parts by weight of stearic acid, and 10 parts by weight of talc were pelletized by a twin extruder, and the test piece was prepared by using a specimen extruder. The measurement results of the physical properties are as follows.

Flow index ashes(%) Izod impact strength
kgf / cm importance The tensile strength
MPa
% Elongation Flexural strength
MPa
Modulus
MPa Hardness 26 3.5 39 0.958 180 832 156 15600 42

The heat absorption and release characteristics of Example 1 were analyzed with a differential scanning calorimeter.

The heat absorption and release characteristics of Example 2 were analyzed by differential scanning calorimetry.

As shown in Fig. 1, the polypropylene composition of Example 1 absorbs heat at 24.6 J / g at 55 ° C and releases 24.4 J / g of heat when solidified as shown in Fig. 2.

In addition, as shown in Fig. 3, the polypropylene composition of Example 2 had a small amount of heat absorption in the region of 120 ° C., but was almost insignificant thermally. The same aspect was shown.

Therefore, as shown in the table and the figure, it was confirmed that the mixture of paraffin wax has heat absorption and release characteristics, and by adding a rubber compound, a polypropylene composition having a desired physical property can be obtained by combining with a thermoplastic polypropylene. .

1 is a heat absorption differential scanning thermal analysis results of Example 1

2 is a thermal emission differential scanning sequence analysis of Example 1

3 is a heat absorption differential scanning thermal analysis results of Example 2

4 is a result of the thermal emission differential scanning sequence analysis of Example 2

Claims (8)

A polypropylene composition comprising 10 to 50 parts by weight of rubber and 10 to 80 parts by weight of wax based on 100 parts by weight of polypropylene. delete The polypropylene composition of claim 1, wherein the rubber is nitrile butadiene rubber (NBR) or styrene butadiene rubber (SBR). The polypropylene composition according to claim 1, wherein the wax is made of paraffin wax having a melting point of 30 to 100 ° C. A polypropylene product, which is prepared using a polypropylene composition in which 10 to 50 parts by weight of rubber and 10 to 80 parts by weight of wax are mixed with respect to 100 parts by weight of polypropylene. delete 6. The polypropylene article according to claim 5, wherein the rubber is nitrile butadiene rubber (NBR) or styrene butadiene rubber (SBR). 6. The polypropylene product according to claim 5, wherein the wax is made of paraffin wax having a melting point of 30 to 100 ° C.

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