JPS6262710A - Manufacture of synthetic resin granule - Google Patents

Abstract

PURPOSE:To make the granulation at lower temperature possible and the selection of time chance easy by a method wherein thermoplastic synthetic resin and low- temperature melting thermoplastic synthetic resin are agitated with a high speed rotating blade type mixer for granulation. CONSTITUTION:Commonly used thermoplastic resins such as monopolymer, copolymer or the like of polyvinyl chloride resin and polyethylene are employed as the thermoplastic synthetic resin and low-melting thermoplastic synthetic resin in this case. The flow temperature of the subordinate low-melting thermoplastic synthetic resin measured with a Koka type flow tester under a pressure of 150kg/cm<2> and a viscosity of 10<5> poise in preferably lower than that of the principal thermoplastic synthetic resin by 10 deg.C or more. The timing for changing the low-melting thermoplastic synthetic resin in a high speed rotating blade type mixer is either at the same time or after the charging of the thermoplastic synthetic resin and preferably the charging is better as earlier as possible. The agitation for granulation under the state as mentioned above makes not only the granulation possible at a temperature lower than the temperature under the state that only the thermoplastic synthetic resin is agitated for granulation, but also the selection of cooling timing for controlling the size of granule easier.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for molding synthetic resin particles used for manufacturing synthetic resin sheets used for flooring materials and the like.

[Prior art]

Conventionally, synthetic resin sheets with penetrating patterns have been widely used as flooring materials because they always exhibit the same external pattern even when worn. In the production of synthetic resin sheets with these penetrating patterns, crushed or cut pieces of synthetic resin have been used. It was manufactured by crushing or cutting. Therefore, these crushed pieces and cut pieces can only be obtained with sharp corners or flat shapes, and in order to manufacture synthetic resin sheets using these crushed pieces and cut pieces, it is necessary to crush them on the surface of the base material. A method of arranging and transferring the pieces and cut pieces in a single layer and heat-sealing them using a heat press, etc., or filling the gaps between the arranged crushed pieces and cut pieces with binder resin powder and heat-sealing this. was taken. However, a special device is required to arrange and transfer the material in a single layer, and circular cut pieces must be manufactured in order to obtain a polka dot pattern, which is time-consuming. Therefore, granular synthetic resin has been used, and the synthetic resin granules have been obtained by stirring and granulating synthetic resin powder with a mixer using high-speed rotary blades.

[Problem to be solved]

However, in the conventional method for producing synthetic resin granules, a single thermoplastic synthetic resin powder is placed in a high-speed rotary blade mixer, and colorants, plasticizers, etc. are added to the mixer and the mixture is agitated and granulated. However, since the time from the start of granulation until the granules heat-fuse and become a sticky mass, that is, the granulation time, is short, the viscosity of the granules cannot be tightly controlled, and As soon as the granules are formed, they are thermally fused together and form a sticky mass within a very short period of time, making it difficult to select the timing to start cooling the high-speed rotary vane mixer, etc., making granulation work difficult. The problem is that granulation is not possible unless the temperature is higher than the melting temperature of the thermoplastic synthetic resin.

[Means for solving problems]

The method for producing synthetic resin particles of the present invention involves stirring and granulating a thermoplastic synthetic resin and a low-melting thermoplastic synthetic resin that melts at a lower temperature than the thermoplastic synthetic resin using a high-speed rotary blade mixer. The purpose is to significantly improve grain operation.

That is, a thermoplastic synthetic resin and, if necessary, commonly used additives such as plasticizers, stabilizers, lubricants, fillers, blowing agents, antistatic agents, etc., and a low-temperature melting thermoplastic synthetic resin are mixed into a high-speed rotary blade type. When the thermoplastic synthetic resin mixture is put into a mixer and heated and stirred, the low-temperature melting synthetic resin melts first as the temperature of the thermoplastic synthetic resin mixture rises, and this adhesive force allows it to be mixed with the thermoplastic synthetic resin that is not yet in a molten state. In order to promote the growth of particles by adhering the additives added accordingly, the granulation time becomes longer, controlling the viscosity and suppressing the formation of sticky lumps due to thermal fusion of particles, thereby significantly reducing the granulation work. It is characterized by improving.

As the thermoplastic synthetic resin, any commonly used thermoplastic synthetic resin can be used, such as a homopolymer or a copolymer ring of polyvinyl chloride resin, polyethylene, or acrylic resin.

As with the thermoplastic synthetic resins mentioned above, the low-temperature melting thermoplastic synthetic resins include any commonly used thermoplastic synthetic resins such as homopolymers and copolymers of polyvinyl chloride resin, polyethylene, and acrylic resin. But it's okay. For example, when polyvinyl chloride resin is used as the thermoplastic synthetic resin, examples of low-temperature melting thermoplastic synthetic resins include vinyl chloride-vinyl acetate copolymer resin, ethylene-vinyl acetate copolymer resin, and vinyl chloride-ethylene copolymer resin. , low-temperature-melting urethane resins, etc. can be used, and polyvinyl chloride resins having a lower degree of polymerization than the polyvinyl chloride resin used as the main thermoplastic synthetic resin can also be used as the low-temperature-melting thermoplastic synthetic resin.

For low-temperature melting thermoplastic synthetic resins, Koka type flow tester (nozzle: 1%
Pressure 150 b/all at 1oX), viscosity 10 po
It is preferable that the flow temperature during rise is 10°C or more lower. There is no substantial effect unless the flow temperature is lower by 10° C. or more.

The amount of the low-temperature melting thermoplastic synthetic resin used is 5 parts by weight to 300 parts by weight of the low-temperature melting thermoplastic synthetic resin per 100 parts by weight of the thermoplastic synthetic resin. Usage of low-temperature melting thermoplastic synthetic resin If the amount is less than 5 parts by weight, there is virtually no effect, and if it exceeds 300 parts by weight, thermoplastic synthesis may occur during stirring and granulation due to adhesion of the low-temperature melting thermoplastic synthetic resin. The disadvantage is that the fluidity of the resin composition is significantly reduced and large lumps are likely to occur.

Further, if necessary, commonly used additives such as plasticizers, stabilizers, lubricants, fillers, colorants, foaming agents, antistatic agents, and fungicides are added to the thermoplastic synthetic resin.

Examples of plasticizers include general-purpose plasticizers such as dioctyl phthalate, dibutyl 7-thalate, butylbenzyl phthalate, dioctyl adipate, and tricresyl phosphate, reactive plasticizers such as DAP, acrylic monomers, and acrylic oligomers, and tryptoxy. Ethyl 7 phosphate, butyl diglycol adipate, Sansocizer〇-
Examples include antistatic plasticizers such as 1100 (Shin Nippon Rikagyoku), secondary plasticizers such as dodecylbenzene derivatives, and the like.

The amount of plasticizer added is 10 to 100 parts by weight per 100 parts by weight of resin.
Parts by weight are preferred.

Further, commonly used additives such as stabilizers, lubricants, fillers, foaming agents, antistatic agents, and fungicides are used as necessary.

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. . In addition to these purposes, lightweight fillers such as calcium carbonate, clay, silica, shirasu balloons, glass balloons, wood flour, and cork powder, as well as materials that impart conductivity and antistatic properties, are also used for purposes such as cost reduction and weight reduction. Conductive powder fillers and conductive short fibers such as carbon powder, carbon fiber, powders and short fibers made of metals such as silver, steel, nickel, aluminum, stainless steel, and iron, for the purpose of imparting wear resistance and anti-slip properties silica sand grains, silicate compound particles, glass powder, crushed ceramic grains, hard powders such as carborundum and alundum, short glass fibers, short fibers of potassium titanate, and MOS (calcium metasilicate) for the purpose of imparting dimensional stability. ) Inorganic short fibers such as short fibers can be used.

The conductive powder filler preferably has a particle size of 0.5 to 1000μ, and the conductive short fibers have a diameter of 4μ to 600μ and a length of 0.5 to 1000μ.
A range of 2o■ is preferred. The amount added needs to be set appropriately depending on the desired resistance value, but in the case of a conductive powder filler, it is necessary to add about 2% by weight or more, and in the case of conductive short fibers, it is necessary to add about 100% by weight or more. Hard powder particles have a diameter of 10μ to 1
The amount of addition is preferably 5% by weight or more.

Other additives, fillers, etc. may be added as appropriate depending on the purpose of use.

These additives may be used alone or in combination of two or more.

The low-melting thermoplastic synthetic resin may be introduced into the high-speed rotary blade mixer at the same time as the thermoplastic synthetic resin, or after the thermoplastic synthetic resin has been introduced into the Henschel mixer and stirring has started. , the earlier the introduction time, the better.

As the high-speed rotary vane type mixer used in the present invention, those commonly used can be used, such as the Henschel mixer (manufactured by Mitsui Miike Kakoki), the super mixer (manufactured by Yoda Seisakusho), and the New Gram Machine (manufactured by Daiwa Kakoki). ) etc. can be used. In addition, when agitating and granulating a synthetic resin composition using a high-speed rotary blade mixer, the granulation conditions differ somewhat depending on the mixer model, volume, etc., so it is necessary to adjust the granulation conditions accordingly.

〔Example〕

Examples are given below to explain the present invention in more detail, but the present invention is not limited to the examples.

Example 1 White thermoplastic synthetic resin particles were produced with the composition shown in the table below.

Henschel mixer FIM10B (Mitsui Miike Kakoki M)
Add the resin, calcium carbonate, and white coloring agent (υ), and add the liquid components of plasticizer, epoxidized soybean oil, and stabilizer while stirring at high speed.After adding, add 2.5Kf to the jacket of Henschel mixer. When the temperature of the resin composition reaches 120°C, the steam is stopped, and when the temperature of the resin composition reaches 132°C due to frictional heat caused by stirring, the rotor is rotated at low speed. When the particles have grown, the jacket is cooled with water, and when the temperature of the resin composition reaches 40°C, it is discharged from the Henshil mixer to form white thermoplastic synthetic resin particles with a particle size of 0.5 to 3 m. I got it.

Comparative Example 1 The low-temperature melting vinyl chloride/vinyl acetate copolymer resin of Example 1 (Goon 400 x 150 ML, vinyl acetate content 15 inches, flow rate 48 degrees and 152 degrees Celsius) was not used, and vinyl chloride/vinyl acetate copolymer resin was used.
Vinyl acetate copolymer resin (Geon103IF-85, vinyl acetate content 5 'I', flow temperature 1 malo ℃)
A resin composition having the same composition as in Example 1 except that 0.00 parts by weight was used was heated and stirred in the same manner as in Example 1.

As a result, almost no particle growth was observed even when the temperature of the resin composition reached 160°C, and when heating and stirring were continued, noticeable particle growth was observed when the temperature of the resin composition reached 170°C. Immediately after that, rapid particle growth occurred, resulting in partially sticky large lumps, making it impossible to obtain synthetic resin particles with the desired particle size.

[Action/Effect]

In the present invention, since the thermoplastic synthetic resin and the low-melting thermoplastic synthetic resin are used together for stirring and granulation, the granulation can be performed at a lower temperature than when stirring and granulating the thermoplastic synthetic resin alone. In addition, it has the effect of making it easier to select the cooling time for granulation work, especially for controlling particle size.

Claims (1)

[Claims] A method for producing synthetic resin particles, which comprises stirring and granulating a thermoplastic synthetic resin and a low-melting thermoplastic synthetic resin that melts at a lower temperature than the thermoplastic synthetic resin using a high-speed rotary blade mixer.