JPH0227123B2 - - Google Patents

Description

[Detailed description of the invention]

[Industrial Application Field] The present invention relates to multicolored synthetic resin particles and a method for producing the same, and more specifically, the present invention relates to multicolored synthetic resin particles that are used in the production of synthetic resin sheets used for flooring, etc., and that have a flowing pattern. The present invention relates to multicolored synthetic resin particles used in producing synthetic resin sheets and a method for producing the same. [Prior Art] Conventionally, as a method of forming a sheet having a so-called flow pattern, such as a marble pattern, in which several types of colors are arranged in a jumbled manner, pigments are kneaded into a thermoplastic synthetic resin material such as vinyl chloride resin, and the sheet is formed into a sheet. At the same time, a flow pattern is formed on the surface of this sheet by adding the pigment and kneading, and the pigment is applied to the surface of this sheet material, or the colored base sheet is pasted together, and the sheet is shredded into cubes such as squares. This shredded material was filled into a press mold box in an amorphous shape, heat and pressure was applied to promote the flow of the shredded material inside the press mold box, and the material was cooled and fixed in a fluid state to form a plate-shaped body. A method of obtaining synthetic resin sheets with various three-dimensional patterns including marble patterns by grinding objects is known (Japanese Patent Publication No. 38-4684). is used to form sheets with flow patterns. [Problems to be Solved by the Invention] However, the conventional shredded materials described above have a cubic shape, and it is extremely difficult to form them into layers so that they have a uniform plane when they are arranged in layers during hot pressing. It is also difficult to layer each material densely, and as a result, it is necessary to make up for these shortcomings by stacking the shredded materials to increase the thickness of the layer, and the resulting sheet is The drawback was that it inevitably became thicker and it was difficult to obtain a thin sheet. Furthermore, in order to obtain the above-mentioned material, pigment is kneaded into a thermoplastic synthetic resin to form a sheet, and a flow pattern is formed on the sheet surface by adding the pigment and kneading, so it is very difficult to control the kneading, such as over-kneading. In extreme cases, the color may change to one color, making it impossible to form a flowing pattern, and if the degree of kneading is too low, there is a risk that a sufficient flowing pattern may not be obtained. In forming a sheet having a flowing pattern, the present invention can easily arrange it in layers, and can also easily arrange it in a single layer, and as a result, it is possible to easily form not only thick sheets but also thin sheets. It is an object of the present invention to provide multicolored synthetic resin particles that can be formed and that can form a good flow pattern. Another object of the present invention is to provide a method for producing multicolored synthetic resin particles as described above, which can produce uniform and good multicolored synthetic resin particles without any mis-control of kneading. With the goal. [Means for Solving the Problems] As a result of intensive research in order to solve the above problems, the present inventors have developed a method by stirring and granulating multiple types of colored fine-grained thermoplastic synthetic resins in a high-speed rotary vane type mixer. The multicolored synthetic resin particles solve the above problems, and the method for producing the multicolored synthetic resin particles includes stirring and granulating at least two or more types of colored fine-grained thermoplastic synthetic resins in a high-speed rotary blade mixer. The present invention was completed by discovering that uniform and good resin particles can be obtained. That is, one aspect of the present invention is that a plurality of colored fine-grained thermoplastic synthetic resins are agitated and granulated in a high-speed rotary vane type mixer, and a flow pattern in which a plurality of colors are mixed on the surface and inside of the synthetic resin particles is created. The gist is multicolored synthetic resin particles formed by forming. Another aspect of the present invention is to charge at least two or more kinds of colored fine-grained thermoplastic synthetic resins into a high-speed rotary vane type mixer, heat and stir in the mixer, and then cool them. The gist of the present invention is to provide a method for producing multicolored synthetic resin particles, which is characterized by obtaining multicolored synthetic resin particles in which colors form a mixed flow pattern on the surface and inside of the synthetic resin particles. The multicolored synthetic resin particles of the present invention are spherical particles made by agitating and granulating a plurality of colored fine-grained thermoplastic synthetic resins in a high-speed rotary vane type mixer, and at least two or more types of colors are present not only on the surface of the particles but also on their surfaces. It exists in a state of confusion even inside. The fine particulate thermoplastic synthetic resin referred to in the present invention is one with an average particle size of about 0.2 to 5 mm, preferably 0.5 to 5 mm.
It refers to a material of about 3 mm, and any shape can be used, including spherical, elliptical, and cylindrical. The above-mentioned thermoplastic synthetic resin may be any commonly used thermoplastic synthetic resin such as homopolymers or copolymers such as polyvinyl chloride resin, vinyl acetate resin, polyethylene, polypropylene, acrylic resin, etc., alone or Can be used in combination. The colored fine particulate thermoplastic synthetic resin is, for example,
Thermoplastic synthetic resin powder is put into a high-speed rotary blade mixer together with a colorant and plasticizer, and the resulting mixture is heated and stirred, or the colored synthetic resin formed into a sheet or rod shape is crushed or cut. Among these, a plurality of types with different colors are used. As the colorant, any colorant that has been conventionally used for coloring thermoplastic synthetic resins can be used. In addition, the above-mentioned plasticizers include general-purpose plasticizers such as dioctyl phthalate, dibutyl phthalate, butylbenzyl phthalate, dioctyl adipate, and tricresyl phosphate, as well as reactive plasticizers such as DAP, acrylic monomers, and acrylic oligomers. , tributoxyethyl phosphate, butyl diglycol adipate, Sansocizer C
Antistatic plasticizers such as −1100 (manufactured by New Nippon Rika),
Examples include secondary plasticizers such as dodecylbenzene derivatives. The amount of plasticizer added is based on 100 parts by weight of resin.
10 to 100 parts by weight is preferred. Additionally, commonly used additives such as stabilizers, lubricants, fillers, foaming agents, antistatic agents, and fungicides may be used as required. In particular, the filler is effective in improving fluidity reduction due to adhesion of the thermoplastic synthetic resin composition during stirring with a high-speed rotary blade mixer and suppressing the generation of coarse particles, and is preferably added within a range that does not cause any problems. or,
In addition to these purposes, we also use lightweight fillers such as calcium carbonate, clay, silica, shirasu balloons, glass balloons, wood powder, and cork powder for the purpose of cost reduction and weight reduction, and for the purpose of imparting conductivity and antistatic properties. Conductive powder fillers and conductive short fibers such as carbon powder, powders and short fibers made of carbon fiber, metals such as silver, copper, nickel, aluminum, stainless steel, and iron, and silica sand for the purpose of imparting wear resistance and anti-slip properties. Hard powder particles such as grains, silicate compound particles, glass powder, crushed ceramic particles, carbon random, and alundum, short glass fibers, potassium titanate short fibers, and MOS (calcium metasilicate) short fibers for the purpose of providing dimensional stability. Inorganic short fibers such as fibers can be used. The conductive powder filler preferably has a grain size of 0.5 to 1000 μm, and the conductive short fibers have a diameter of 4 to 600 μm and a length of 0.5 to 20 μm.
A range of mm is preferred. The amount added needs to be set appropriately depending on the desired resistance value, but it is necessary to add about 2% by weight or more in the case of a conductive powder filler, and about 1% by weight or more in the case of conductive short fibers. The hard powder particles preferably have a diameter of 10 to 1000 μm, and the amount added is preferably 5% by weight or more. Other additives, fillers, etc. are added in appropriate amounts depending on the purpose of use. These additives may be used alone or in combination with
There is no problem in using a mixture of more than one species. In the present invention, multicolor synthetic resin particles are obtained by agitating and granulating a plurality of kinds of the colored fine-grained thermoplastic synthetic resins in a high-speed rotary vane type mixer. Particularly, by agitating and granulating conductive fine particulate thermoplastic synthetic resin containing conductive filler or conductive fiber as described above and non-conductive fine particulate thermoplastic synthetic resin with a high-speed rotary blade mixer, partial granulation can be achieved. Conductive synthetic resin particles having a conductive flow pattern can be obtained. In this case, it is preferable to add 1 part by weight or more of the conductive fine-grained thermoplastic synthetic resin to 100 parts by weight of the non-conductive fine-grained thermoplastic synthetic resin. The high-speed rotary vane type mixer used in the present invention can be one that has been commonly used in the past, such as the Hensiel mixer (manufactured by Mitsui Miike Kakoki), the super mixer (manufactured by Kawada Manufacturing Co., Ltd.), and the Newgra Machine (manufactured by Daiwa Kakoki Co., Ltd.). Machine-made) etc. can be used. Multiple types of colored fine-grained thermoplastic synthetic resins put into a high-speed rotary vane type mixer are heated and stirred in the mixer to increase the particle volume and form into spherical shapes, forming multicolored synthetic resin particles with a mixture of colors. be done. At this time, it is preferable to use at least one type of colored fine-grained thermoplastic synthetic resin having a melting temperature lower than the melting temperature of the other colored fine-grained thermoplastic synthetic resins. By doing so, the colored fine-grained thermoplastic synthetic resin with a low melting temperature increases its fluidity when heated and stirred, and the adhesion of other fine-grained thermoplastic synthetic resins improves, making particle growth easier. At the same time, the color scheme of the resulting resin particles becomes more decorative. In the present invention, a predetermined colored fine-grained thermoplastic synthetic resin is put into a high-speed rotary vane type mixer, and the rotary vane is stirred at a rotational speed of about 20 to 50 m/sec, and at the same time steam is passed through the jacket of the mixer to start heating. do. As a result, the temperature of the finely divided thermoplastic synthetic resin increases due to heat transfer from the inner wall surface of the mixer and generation of frictional heat due to high-speed stirring of the colored finely divided thermoplastic synthetic resin, and granulation begins. After the synthetic resin reaches the desired particle size, stop heating and reduce the rotation speed of the mixer rotor to about 5~
The speed was lowered to 20 m/sec, and the mixture was cooled and stirred at a low speed that would not destroy the granules, and then the multicolored synthetic resin particles were taken out. The above operation is usually carried out by heating and stirring using a heating mixer, and immediately transferring the particles to a cooling mixer when the desired particle size is reached, followed by cooling and stirring at a low speed that does not destroy the particles. The temperature when heating is stopped is the melting temperature of the resin used,
Although various changes can be made depending on the desired particle size of the resulting multicolored synthetic resin particles, the temperature is generally preferably about 100 to 250°C. The particle size of the multicolored synthetic resin particles obtained in the present invention can be selected from various sizes as required, but generally 1
~20mm. If the obtained multicolored synthetic resin particles are required to have a large particle size, use a colored fine-grained thermoplastic synthetic resin that is charged into a high-speed rotary vane type mixer and have a large average particle size. When multicolored synthetic resin particles with a small size are required, the colored fine-grained synthetic resin charged into the high-speed rotary vane type mixer may have a small average particle size. In the present invention, multicolored synthetic resin particles having various flowing patterns can be produced by changing the amount of coloring agent added, the particle size of the colored finely divided thermoplastic synthetic resin to be mixed, the melting temperature or flow characteristics of the resin used, etc. can be obtained. Furthermore, by adding additives depending on the purpose to the colored fine-grained thermoplastic synthetic resin, it is possible to obtain multicolored synthetic resin particles with various functionalities. [Examples] Hereinafter, the present invention will be explained in more detail with reference to Examples, but the present invention is not limited to these Examples. Example 1 A black fine-grained thermoplastic synthetic resin and a yellow fine-grained thermoplastic synthetic resin were produced according to formulations (1) and (2) shown in Table 1 below, respectively.

〔Effect of the invention〕

The multicolored synthetic resin particles of the present invention are obtained by stirring and granulating a plurality of types of colored fine-grained thermoplastic synthetic resins in a high-speed rotary vane type mixer, so the synthetic resin particles can be used to form a sheet with a flow pattern. In this case, layers can be easily formed and sheets can be formed with high work efficiency. Furthermore, in the resin particles of the present invention, a plurality of colors exist in a disordered manner not only on the surface of the particles but also inside the particles, and if a sheet is formed using the particles, a pattern without directionality can be formed, and it is highly decorative. A sheet can be formed. In addition, in the production method of the present invention, resin particles can be formed in which the colors of each colored particulate thermoplastic synthetic resin are clearly arranged in a disordered manner, and there is no problem such as difficulty in controlling kneading as in the past. Moreover, resin particles of any particle size can be easily obtained, various fillers can be easily mixed in large amounts, and resin particles for sheet formation can be provided with various functions depending on the type of filler. It has various effects such as being easily obtainable.

Claims (1)

[Scope of Claims] 1. A product made by stirring and granulating a plurality of types of colored fine-grained thermoplastic synthetic resins in a high-speed rotary vane type mixer, and forming a flow pattern in which a plurality of colors are mixed on the surface and inside of the synthetic resin particles. Multicolored synthetic resin particles. 2. At least two or more types of colored fine-grained thermoplastic synthetic resins are put into a high-speed rotary vane type mixer, heated and stirred in the mixer, and then cooled so that multiple colors appear on the surface and inside of the synthetic resin particles. 1. A method for producing multicolored synthetic resin granules, which comprises obtaining multicolored synthetic resin granules that form a mixed flow pattern. 3. A patent claim in which the melting temperature of at least one colored fine-grained thermoplastic synthetic resin among the two or more types of colored fine-grained thermoplastic synthetic resins is lower than the melting temperature of the other colored fine-grained thermoplastic synthetic resins. A method for producing multicolored synthetic resin particles according to Scope 2.