JPH0234641A - Expandable styrene resin particle and its production - Google Patents

Abstract

PURPOSE:To make it possible to decrease gaps among the particles of a molding by fusing expandable styrene resin particles with each other at their boundries during the molding step by coating the surfaces of the resin particles with a specified organic compound and a cationic surfactant. CONSTITUTION:Styrene (a) is (co)polymerized with, optionally, other vinyl monomers (b), and a blowing agent (c) is added to the system during or after its (co)polymerization to obtain expandable styrene resin particles (A) containing 1-20 pts.wt. component (c) per 100 pts.wt. component (A). Separately, 0.01-0.3 pt.wt., per 100 pts.wt. component A, at least one member (d) selected from among a nonionic surfactant, an oxyethylene/oxypropylene block polymer and a normally liquid oily organic compound of a solubility parameter <=8 is mixed with 0.001-0.3 pt.wt., per 100 pts.wt. component A, cationic surfactant (e) to obtain a mixture (B). The surface of component A is coated with component B in the presence of water, and the water adhered to the surface is removed. The product is dried so as to evaporate 3-40wt.% component (c).

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to expandable styrenic resin particles and a method for producing the same. More specifically, in the production of molded products with a cell structure, foamed particles are completely fused together at their interfaces during the molding process, making it possible to produce molded products with as few interparticle gaps as possible. The present invention relates to styrenic resin particles and a method for producing the same.

[Conventional technology and problems]

Expandable styrenic resin particles can be prepared, for example, by impregnating polystyrene resin particles in an aqueous suspension with a blowing agent, that is, a readily volatile aliphatic hydrocarbon such as n-pentane, which only slightly swells the particles. Alternatively, it is produced by impregnating polystyrene resin particles with a gaseous blowing agent such as butane or propane at room temperature in an aqueous suspension together with a small amount of a solvent such as toluene or cyclohexane that dissolves the particles.

The expandable styrenic resin particles thus produced are suitable for industrially and economically producing zero-expandable styrenic resin moldings, which are used as raw materials for manufacturing expanded styrene resin moldings. The styrene-based resin particles are made into pre-expanded particles using water vapor or the like, and the pre-expanded particles are filled into a closed metal base having a desired shape with a large number of small holes bored in the wall surface, and the small holes of the mold are filled with the pre-expanded particles. A common method is to eject a heating medium such as water vapor to heat the pre-expanded particles to a temperature higher than their softening point, fuse them together, and then take them out of the mold.

The expandable styrenic resin particles produced as described above coalesce and form agglomerates in the pre-foaming step, thereby clogging particle transfer pipes or mold cavity filling holes and causing obstructions. In order to prevent this, a method is used in which the surface of the expandable styrene resin particles is coated with, for example, metal soap, talc powder, or wax.
It is difficult for the pre-expanded particles of expandable styrenic resin particles whose surface has been surface coated by these methods to completely fill the gaps between the particles in the special mold cavity, and foaming is suppressed due to the accumulation of steam drainage generated during heating. The resulting molded product contains a large amount of moisture immediately after molding because the particles are not sufficiently fused together, and furthermore, the porosity is high due to the poor filling state of the pre-expanded particles near the mold wall. There are problems such as an increase in the occurrence of drainage in some parts and the generation of particle gaps on the surface of the molded body.

The molded product obtained in this way needs to be sufficiently dried when used as a packaging material for electrical appliances, but even if it is sufficiently dried, the strength may deteriorate due to the gaps between the particles. It also has the disadvantage of attracting dust due to the charging of the molded body. In order to deal with problems caused by charging, methods have been adopted such as adding a cationic surfactant during pre-foaming of expandable styrenic resin particles or adding it after pre-foaming to prevent charging of the molded product. However, in this case, the filling of the pre-expanded particles into the mold is insufficient, which tends to cause molding defects, resulting in an unavoidable drop in productivity.Furthermore, the molded product is not sufficiently foamed, resulting in poor appearance. However, there are problems such as loss of value as a packaging material.

[Means for solving problems]

The present inventors aimed to eliminate the drawbacks of the above-mentioned prior art, and created a cell in which foamed particles are completely fused together at their boundary surfaces during the molding process, and the gap between particles is reduced as much as possible. As a result of intensive research in order to obtain a molded product that has a structure and does not attract dust due to charging, the present invention has been completed.

That is, the first aspect of the present invention is that the surface of expandable styrenic resin particles containing 1 to 20 parts by weight of a blowing agent per 100 parts by weight of styrenic resin particles has a nonionic interface with respect to 100 parts by weight of the resin particles. Activator, oxyethylene/oxypropylene block polymer and solubility parameters (Sol
0.01 to 0.3 parts by weight of at least one organic compound selected from organic compounds that are oily liquids at room temperature and have a utility parameter (hereinafter referred to as SP value) of 8 or less, and 0.001 to 0.3 parts by weight of a cationic surfactant. 3 parts by weight, the moisture attached to the surface is 0.5% by weight or less, and the dissipation rate of the foaming agent contained is 3 to 40% by weight. The second aspect of the present invention is to dry the surface of expandable styrenic resin particles containing 1 to 20 parts by weight of a blowing agent per 100 parts by weight of styrenic resin particles in the presence of water.
0 parts by weight, 0.01-0.3 parts by weight of at least one selected from nonionic surfactants, oxyethylene/oxypropylene block polymers, and organic compounds that are oily liquids at room temperature and have an SP value of 8 or less. After coating with a mixture of 0.001 to 0.3 parts by weight of a cationic surfactant, water adhering to the surface of the coated resin particles is removed, and 3 to 0.3 parts by weight of a blowing agent contained therein is removed.
The third aspect of the present invention is a method for producing expandable styrene thread fat particles, which is characterized by performing a drying process to dissipate 40% by weight of the foaming agent. In the presence of water, the surface of expandable styrenic resin particles containing 10
0 parts by weight of at least one selected from nonionic surfactants, oxyethylene/oxypropylene block polymers, and organic compounds that are oily liquids at room temperature and have an SP value of 8 or less. After coating with 0.001 to 0.3 parts by weight of a cationic surfactant, a drying treatment is performed to remove moisture adhering to the surface of the coated resin particles and to dissipate 3 to 40% by weight of the foaming agent. Each content includes a method for producing expandable styrenic resin particles.

The expandable styrenic resin particles in the present invention are resin particles obtained by adding a blowing agent during polymerization and impregnating it after polymerization, such as a polymer of styrene alone or other polymers mainly composed of styrene These are polymer particles that can be foamed by heating a copolymer with a vinyl monomer or the like containing a foaming agent that is liquid or gaseous at room temperature in the polymerization core, or by impregnating it after polymerization. Of course, commonly used additives may be included.

As the blowing agent in the present invention, an easily volatile hydrocarbon having a boiling point lower than the softening point of the resin particles is used, preferably one that does not dissolve the resin particles or only slightly swells the resin particles, and one or two types. Used in mixtures of the above. The blowing agent is, for example, propane, butane, pentane, or one containing these as the main component, and a portion thereof may be replaced with hexane, heptane, cyclohexane, methyl chloride, freon, etc. The amount of blowing agent is 1 to 20 parts by weight per 100 parts by weight of styrene resin particles.
Parts by weight.

Examples of the nonionic surfactant used as a coating material in the present invention include polyoxyethylene alkyl ether,
Examples include ether types such as polyoxyethylene alkylphenol ether, and ester types such as polyoxyethylene alkyl ester, sorbitan alkyl ester, and polyoxyethylene sorbitan alkyl ester. Nonionic surfactants belonging to these categories include, for example, polyoxyethylene lauryl ether, polyoxyethylene cetyl ether, polyoxyethylene oleyl ether, polyoxyethylene stearyl ether, polyoxyethylene raw fatty acid ether, polyoxyethylene octylphenol ether, and polyoxyethylene octyl phenol ether. Oxyethylene nonylphenol ether, polyoxyethylene octylphenol ether, polyoxyethylene laurate, polyoxyethylene palmitate, polyoxyethylene stearate, polyoxyethylene oleate, polyoxyethylene bovine fatty acid ester, sorbitan monolaurate, sorbitan mono myristate, sorbitan monopalmitate, sorbitan monostearate, sorbitan
Monooleate, sorbitan sesquiolate, sorbitan triolate, sorbitan monobehenate, polyoxyethylene sorbitan monolaurate, polyoxyethylene sorbitan monopalmitate, polyoxyethylene sorbitan monostearate, polyoxyethylene sorbitan monooleate, etc. There is no problem in using a mixture of these.

The oxyethylene/oxypropylene block polymer used as the coating material in the present invention is not particularly limited in terms of the average molecular weight of the polypropylene glycol and the polyethylene oxide content in the product, but water-soluble ones are preferred. For example, the average molecular weight of polypropylene glycol is 11,000 to 2,000, and the average molecular weight of polyethylene oxide is 20 to 80% by weight of oxyethylene.
Examples include oxypropylene block polymers, and it is possible to use a mixture of these.

The organic compound which is an oily liquid at room temperature and is used as a coating material in the present invention has an SP value of 8 or less. If the SP value exceeds 8, the resin particles will crack and cannot be used for the purpose of the present invention. Examples of organic compounds that are oily liquids at room temperature with an SP value of 8 or less include liquid paraffin with a kinematic viscosity of 7 to 95 cSt/40°C, or those with the general formula (wherein R1-R1 represents a hydrogen atom, a methyl group, or a phenyl group, and R5 ~RIG is a methyl group or a phenyl group; am is an integer of 1 or more; and n is an integer of 1 or more. The above-mentioned oil-type or emulsion-type mixtures can be mentioned.

The method for measuring and calculating the SP value is described in "Polymer Handbook, A Wi
ley-1interscience Publicat
i-on Publishing) J. IV-337.

The above-mentioned nonionic surfactant, oxyethylene/oxypropylene block polymer, and an organic compound having an SP value of 8 or less and which is an oily liquid at room temperature can be used alone or mixed in any ratio as is, or as an aqueous solution, an aqueous dispersion, or an aqueous solution. Used as an emulsion. The coating agent is used in an amount of 0.01 to 0.3 parts by weight per 100 parts by weight of the expandable styrene resin particles. If it is less than 0.01 part by weight, the effect of smoothing the surface of the molded product will not be sufficient, and if it exceeds 0.3 part by weight, the grain boundaries on the surface of the molded product will be in a molten state, resulting in poor appearance.

Cationic surfactants used as coating agents in the present invention include alkylamine salts and quaternary ammonium salts, and examples of cationic surfactants belonging to these include octadecylamine acetate, stearylamine acetate, Stearylamine hydrochloride, octadecyltrimethylammonium chloride, alkyl(tallow) trimethylammonium chloride, dodecyltrimethylammonium chloride, alkyl(coconut) trimethylammonium chloride, hexadecyltrimethylammonium chloride, alkyl(coconut)dimethylbenzylammonium chloride, oxyethylene dodecylamine , polyoxyethylenealkylamine, N-hydroxyethyl N(2-hydroxyalkyl)amine, etc., and it is okay to use a mixture of two or more of these.

The cationic surfactant is 0.0% per 100 parts by weight of the resin particles.
0.001-0.3 parts by weight.

If the amount is less than o or ooi parts by weight, the antistatic effect during the dissipation treatment of the blowing agent contained in the expandable styrenic resin particles and the antistatic effect of the molded product will not be sufficient, and even if it exceeds 0.3 parts by weight, the antistatic effect will not be sufficient. The cationic surfactant dissolves into the water vapor drain during foaming, does not further improve the antistatic effect, and is therefore uneconomical.
The oxypropylene brosoxypolymer may be mixed with an oily liquid organic compound at room temperature having an SP value of 8 or less and coated on the resin particle surface, or the former may be coated and then the latter may be coated.

The above-mentioned coating agent is coated on the surface of the resin particles in the presence of water. Methods for coating in the presence of water include preparing an aqueous solution, dispersion (suspension) or emulsion of the coating agent and adding resin particles thereto; There are methods such as adding the coating agent into the liquid (turbid), adding the coating agent directly to the resin particles to which water has adhered, etc. A method of thoroughly mixing the emulsion may be mentioned. In this case, after the coating treatment, the resin particles may be impregnated and coated with an agglomeration inhibitor during pre-foaming such as zinc stearate, talc, calcium carbonate, T8 water agent, etc., or other coating methods may be used. As a method, resin particles impregnated with a blowing agent in an aqueous suspension are dehydrated using a centrifugal dehydrator, and then used undried, and a coating agent or its aqueous solution, aqueous dispersion, or aqueous emulsion is applied to the surface. Adhesive methods using a blender or the like are also advantageous. If the coating material is coated on the surface of the particles in the absence of water, uneven coating occurs, resulting in a molded article with partially dark uneven color. On the other hand, when coating with a system in which water is present, uniform coating is achieved and a good molded article is obtained. Moreover, surprisingly, after coating, the surface moisture content is dried to 0.5% by weight or less, preferably 0.1% by weight or less, and further, 3-40% by weight, preferably 6-25% by weight of the blowing agent contained. The present inventors have found that by carrying out the dissipation treatment, the surface of the molded product has no particle gaps and exhibits an excellent appearance.
If the weight percentage is exceeded, particle gaps will appear on the surface of the molded product, resulting in poor appearance. In addition, if less than 3% by weight of the contained blowing agent escapes, the effect of smoothing the surface of the molded product is not sufficient, and 40%
If more than % by weight is allowed to escape, the grain boundaries on the surface of the molded product will collapse, resulting in poor appearance.

There are no particular limitations on the method for drying the moisture adhering to the expandable styrene resin particles together with the coating agent.

There are various methods for dissipating and removing the foaming agent contained in the expandable styrenic resin particles that have been coated with the coating agent and removed the attached moisture. The foaming agent contained can be dissipated using a ventilation dryer, a fluidized bed dryer, or the like. The treatment temperature is below the foaming temperature of the expandable styrenic resin particles, preferably 35° C. or higher from the viewpoint of productivity.The amount of dissipation of the foaming agent contained can be adjusted by the treatment temperature and treatment time.

Furthermore, the dryer or the like can simultaneously remove moisture attached to the coated resin particles and dissipate the foaming agent contained therein.

Moisture on the surface of resin particles can be measured using a Karl Fischer moisture meter using a methanol dehydrated solvent.

Further, the amount of blowing agent contained in the resin particles can be measured by a scattering method using a soaking dryer or the like.

[Action/Effect]

According to the present invention, it is possible to provide an excellent molded product in which expanded particles are completely fused together, there is substantially no particle gap, and there is no adsorption of dust after the molded product is dried.

Although it is not necessarily clear why such an excellent molded product can be obtained according to the present invention, it is possible that the coating agent penetrates into the surface portion of the expandable styrene resin particles during drying of water and the foam contained in the surface portion. This is thought to be due to the fact that the cell membrane on the surface of the pre-expanded particles became thicker due to the change in the composition of the surface portion due to agent dissipation, resulting in higher heat resistance.

〔Example〕

EXAMPLES Hereinafter, the present invention will be explained in more detail with reference to Examples, but the present invention is not limited thereto.

Example 1 In a pressure-resistant reactor equipped with a stirrer and a temperature detection tube, 100 parts by weight of styrene monomer, 110 parts by weight of water, 0.15 parts by weight of tricalcium phosphate, 0.005 parts by weight of sodium dodecylbenzenesulfonate, Benzoyl peroxide 0.2
5 parts by weight and 0.1 part by weight of tert-butyl perbenzoate were added, and while stirring, the mixture was heated under a pressure of 0.5 kg/cd of nitrogen.
The temperature was raised to 0°C and polymerization was carried out for 5 hours.

Next, 1.8 parts by weight of cyclohexane and 8.5 parts by weight of butane were added, the temperature was raised to 105°C, and impregnation with the blowing agent was carried out for 6 hours. This was cooled to room temperature to obtain true spherical expandable polystyrene resin particles. After drying the resin particles, they were sieved to obtain particles of 14 to 20 mesh sizes, and then 0.09 parts by weight of zinc stearate was added, stirred with a ribbon blender, and then taken out.

Expandable polystyrene resin particles 100 obtained by the above method
After adding a mixed aqueous solution of a nonionic surfactant and a cationic surfactant shown in Table 1 or a water molecule Pi solution to the parts by weight, PJI stirring was performed in a container to uniformly coat each coating agent on the surface of the resin particles. , drying using a flash dryer at an exhaust air temperature of 40°C, and then drying at a temperature of 40°C for 20 minutes in a box-shaped ventilation dryer.
The foaming agent containing the foaming agent was diffused to obtain expandable polystyrene resin particles coated with the coating material. Tables 1 and 6 show the surface moisture and blowing agent dissipation rates.

In addition, in Tables 1 and 6, the HLB value refers to the hydrophilic-lipophilic equilibrium value (Hydrophile-Lipophilic
le B-alance value).

The foaming agent dissipation rate was determined by dividing the difference between the amount of foaming agent before treatment and the amount of foaming agent after treatment by the amount of foaming agent before treatment.

The obtained expandable polystyrene resin particles were heated with steam in a batch-type pre-expanding machine to obtain pre-expanded particles with an apparent volume of about 60 times.

After curing and drying the pre-expanded particles in the atmosphere for 24 hours,
Molding was performed using a Pearl Star 90 automatic molding machine (manufactured by Toyo Kikai Kinzoku ■) using a mold with cavity dimensions of 300 tm x 450 mm x 20 R. Tables 1 and 6 show the internal support ratio, internal state, surface state, internal moisture, and non-static property of the obtained molded body.

In addition, in Tables 1 and 6, the internal support ratio indicates the fusion rate between the foamed particles on the fractured surface of the molded body, and the interface between the foamed particles on the fractured surface when the molded body is torn. It is expressed as a percentage (%) of particles that are torn inside the foamed particles, rather than those that are separated by the particles, to the total number of particles.

The internal state of the molded body is 300wm x 450mx5.
This is an observation of the state of grain gaps in a flat plate cut out, where ◎ means no gaps, ○ means there are some gaps, and Δ means there are gaps.

The surface condition indicates the smoothness of the surface and the state of interparticles, and ◎ means excellent, ○ means good, △ means slightly poor, and × means poor.

Internal moisture was determined by dividing the difference between the molded weight immediately after molding and the weight after drying at 40° C. for 24 hours by the weight after drying.

The non-static property was determined by rubbing the dried molded article with wool 20 times, then bringing it close to tobacco ash and measuring the distance at which it started to be adsorbed. O means 11 or less, Δ means 1 to 21, and × means 21 or more.

Example 2 100 parts by weight of expandable polystyrene m fat particles obtained in Example 1 were coated with a mixed aqueous solution or aqueous dispersion of an oxyethylene/oxypropylene block polymer and a cationic surfactant shown in Table 2, dried and The foaming agent contained was dissipated. Pre-foaming and molding were performed in the same manner as in Example 1. The results are shown in Table 2.

Example 3 100 parts by weight of the expandable polystyrene resin particles obtained in Example 1 were coated with a mixed aqueous dispersion of liquid paraffin and cationic surfactant shown in Table 3 in the same manner as in Example 1, dried and The foaming agent contained was dissipated. Pre-foaming and molding were performed in the same manner as in Example 1. The results are shown in Table 3.

Example 4 100 parts by weight of expandable polystyrene fat particles obtained in Example 1 were coated with a mixed aqueous dispersion of silicone oil and cationic surfactant shown in Table 4 in the same manner as in Example 1, and then Drying and treatment to dissipate the foaming agent contained were performed. Pre-foaming and molding were performed in the same manner as in Example 1. The results are shown in Tables 4 and 6.

Example 5 Sorbitan monooleate (HLB value 4.3) and oxyethylene oxypropylene block polymer (polypropylene glycol average molecular weight 12,000) were added to 100 parts by weight of the expandable polystyrene resin particles obtained in Example 1 in the same manner as in Example 1. , 10% by weight of polyethylene oxide), 5% by weight of liquid paraffin (kinematic viscosity 14.5 cSt/40°C) and dimethylsiloxane, each in a l:1 ratio.
1 part by weight of a mixed aqueous solution or aqueous dispersion (coating agent A) was coated, and then 0.3 parts by weight of a 10% by weight aqueous solution of N-hydroxyethyl-N(2-hydroxyalkyl)amine (coating agent B) was coated.
After coating the weight part, drying and blowing agent diffusion treatment were performed. Pre-foaming and molding were performed in the same manner as in Example 1. The results are shown in Table 5.

Example 6 100 parts by weight of the expandable polystyrene resin particles obtained in Example 1 were mixed with polyoxyethylene cetyl ether (HLB value 11.9), oxyethylene oxypropylene pro7 polymer (polypropylene Glycol average molecule 11000, polyethylene oxide 20
weight%), liquid paraffin (kinematic viscosity 14.5 cst/
After coating 0.05 parts by weight of a coating agent prepared by mixing octadecyl trimethyl ammonium chloride in a ratio of 1:1 on dimethylsiloxane and dimethylsiloxane, the blowing agent contained therein was dissipated in the same manner as in Example I. went. Pre-foaming and molding were performed in the same manner as in Example 1.

The results are shown in Tables 1, 2, 3, and 4.

Example 7 Polyoxyethylene oleyl ether (HLB value 15.4) and octadecyl trimethyl ammonium chloride were added to 100 parts by weight of the expandable polystyrene resin particles obtained in Example 1 in the same manner as in Example 1. After coating 1 part by weight of each of a 5% by weight aqueous solution of 1:1 of methylphenylsiloxane and 5% by weight aqueous solution of 1:1 of octadecyl trimethyl ammonium chloride, the mixture was dried using a flash dryer. Water was removed at an air temperature of 40°C, and then heated to 30°C and 50°C in a box-type aeration dryer.
The blowing agent dissipation treatment was carried out at 60°C for 20 minutes and at 50°C for 2 hours, respectively. Pre-foaming and molding were performed in the same manner as in Example 1.

The results are shown in Table 6.

Example 8 To 100 parts by weight of the expandable polystyrene resin particles obtained in Example 1, oxyethylene/oxypropylene block polymer (polypropylene glycol average molecular weight 12,000, polyethylene oxide 40% by weight) was added in the same manner as in Example 1.
) and dodecyl trimethyl ammonium chloride in a 1:1 ratio in a 5% mixed aqueous solution and liquid paraffin (kinematic viscosity 7.3 cst/40°C) and octadecylamine acetate in a 1:1 ratio by weight. After coating 1 part by weight of each % mixed aqueous dispersion, it was dried in a box type aerated dryer.
Moisture removal and blowing agent dissipation treatments were performed at 0° C. for 30 minutes and at 40° C. for 30 minutes using a fluidized bed dryer.

Pre-foaming and molding were performed in the same manner as in Example 1. The results are shown in Table 6.

Comparative Example 1 To 100 parts by weight of the expandable polystyrene resin particles obtained in Example 1, polyoxyethylene stearyl ether (HL B (TL 14.2), oxyethylene/oxypropylene block polymer (polypropylene) Glycol average molecular f! 1000, polyethylene oxide 40% by weight), liquid paraffin (kinematic viscosity 14.
5 wt.
Pre-foaming and molding were carried out in the same manner as in Example 1 without drying and dissipating the blowing agent contained.

The results are shown in Tables 1, 2, 3, and 4, respectively.

Comparative Example 2 To 100 parts by weight of the expandable polystyrene resin particles obtained in Example 1, polyoxyethylene sorbitan monostearate (HLB value 14.9) and oxyethylene oxypropylene block polymer (polypropylene glycol average molecule! 2000) were added. , polyethylene oxide 40% by weight
), liquid paraffin (kinematic viscosity 14.5 cSt/40°C
) and methylphenylsiloxane were each coated with a mixed solution of oxy-ethylene-dodecyl-amine in a ratio of 1:1 with parts by weight of O and OS, and pre-foaming and molding were performed in the same manner as in Example 1. . The results are shown in Tables 1, 2, 3, and 4.

Comparative Example 3 The expandable polystyrene resin particles obtained in Example 1 were immediately pre-foamed and molded in the same manner as in Example 1 without being coated with a coating agent, removing moisture, or dissipating the foaming agent contained. . The results are shown in Tables 1, 2, 3, and 4.

Claims (1)

[Claims] 1. 1 to 1 blowing agent per 100 parts by weight of styrene resin particles.
The surface of the expandable styrenic resin particles containing 20 parts by weight of the nonionic surfactant, oxyethylene/oxypropylene block polymer, and solubility parameter (SolubilityPa
at least one organic compound selected from organic compounds that are oily liquids at room temperature and have an SP value of 8 or less.
．． 01 to 0.3 parts by weight and 0.00 parts by weight of cationic surfactant
1 to 0.3 parts by weight, and the surface adhesion moisture is 0.5
% by weight or less, and the dissipation rate of the foaming agent contained is 3 to 40.
% by weight of expandable styrenic resin particles. 2. The resin particles according to claim 1, wherein the nonionic surfactant is at least one ether type nonionic surfactant selected from polyoxyethylene alkyl ether and polyoxyethylene alkylphenol ether. 3. The polyoxyethylene alkyl ether is at least one selected from polyoxyethylene lauryl ether, polyoxyethylene cetyl ether, polyoxyethylene oleyl ether, polyoxyethylene stearyl ether, and polyoxyethylene bovine fatty acid ether. The resin particles described. 4. The resin particles according to claim 2, wherein the polyoxyethylene alkylphenol ether is at least one selected from polyoxyethylene octylphenol ether and polyoxyethylene nonylphenol ether. 5. The resin particles according to claim 1, wherein the nonionic surfactant is at least one ester type nonionic surfactant selected from polyoxyethylene alkyl ester, sorbitan alkyl ester, and polyoxyethylene sorbitan alkyl ester. 6. The resin particles according to claim 5, wherein the polyoxyethylene alkyl ester is at least one selected from polyoxyethylene laurate, polyoxyethylene palmitate, polyoxyethylene stearate, and polyoxyethylene oleate. 7. Sorbitan alkyl esters include sorbitan monolaurate, sorbitan monomyristate, sorbitan monopalmitate, sorbitan monostearate,
Claim 5: At least one selected from sorbitan monooleate, sorbitan sesquiolate, sorbitan triolate, and sorbitan monobehenate.
The resin particles described. 8. The polyoxyethylene sorbitan alkyl ester is at least one selected from polyoxyethylene sorbitan monolaurate, polyoxyethylene sorbitan monopalmitate, polyoxyethylene sorbitan monostearate, and polyoxyethylene sorbitan monooleate. The resin particles according to claim 5. 9. The organic compound has a kinematic viscosity of 7 to 95 cSt at 40°C
The resin particles according to claim 1, which are liquid paraffin. 10. Organic compounds have general formulas ▲ Numerical formulas, chemical formulas, tables, etc. 2. The resin particles according to claim 1, wherein the resin particles are at least one silicone oil represented by: (n is an integer of 1 or more). 11. The resin particles according to claim 1, wherein the cationic surfactant is at least one alkylamine salt selected from monoalkylamine salts and dialkylamine salts. 12. The resin particles according to claim 1, wherein the cationic surfactant is at least one quaternary ammonium salt selected from monoalkylammonium salts and dialkylammonium salts. 13. Claim 1, wherein the surface adhesion moisture is 0.1% by weight or less.
The resin particles described. 14. The resin particles according to claim 1, wherein the blowing agent contained has a dissipation rate of 6 to 25% by weight. 15. 1 part blowing agent per 100 parts by weight of styrene resin particles
The surface of expandable styrenic resin particles containing ~20 parts by weight is treated with a nonionic surfactant, an oxyethylene/oxypropylene block polymer, and an SP value of 8 with respect to 100 parts by weight of the resin particles in the presence of water. At least one selected from the following organic compounds that are oily liquids at room temperature0
．． 01 to 0.3 parts by weight and 0.001 parts by weight of cationic surfactant
After coating with a mixture of ~0.3 parts by weight, water adhering to the surface of the coated resin particles is removed and 3 to 40 parts by weight of the blowing agent contained therein is removed.
A method for producing expandable styrenic resin particles, the method comprising performing a drying process to dissipate. 16. 1 part blowing agent per 100 parts by weight of styrene resin particles
The surface of expandable styrenic resin particles containing ~20 parts by weight is treated with a nonionic surfactant, an oxyethylene/oxypropylene block polymer, and an SP value of 8 with respect to 100 parts by weight of the resin particles in the presence of water. At least one selected from the following organic compounds that are oily liquids at room temperature0
．． After coating with 0.01 to 0.3 parts by weight of a cationic surfactant, and then coating with 0.001 to 0.3 parts by weight of a cationic surfactant, the water adhering to the surface of the coated resin particles is removed and the amount of foaming agent contained is 3 to 40% by weight. A method for producing expandable styrenic resin particles, the method comprising performing a drying process to dissipate. 17. The manufacturing method according to claim 15 or 16, wherein the nonionic surfactant is at least one ether type nonionic surfactant selected from polyoxyethylene alkyl ether and polyoxyethylene alkylphenol ether. 18. Claim 17, wherein the polyoxyethylene alkyl ether is at least one selected from polyoxyethylene lauryl ether, polyoxyethylene cetyl ether, polyoxyethylene oleyl ether, polyoxyethylene stearyl ether, and polyoxyethylene bovine fatty acid ether. Manufacturing method described. 19. The manufacturing method according to claim 17, wherein the polyoxyethylene alkylphenol ether is at least one selected from polyoxyethylene octylphenol ether and polyoxyethylene nonylphenol ether. 20. The nonionic surfactant according to claim 15 or 16, wherein the nonionic surfactant is at least one ester type nonionic surfactant selected from polyoxyethylene alkyl ester, sorbitan alkyl ester, and polyoxyethylene sorbitan alkyl ester. Production method. 21. The manufacturing method according to claim 20, wherein the polyoxyethylene alkyl ester is at least one selected from polyoxyethylene laurate, polyoxyethylene palmitate, polyoxyethylene stearate, and polyoxyethylene oleate. 22. The sorbitan alkyl ester is selected from sorbitan monolaurate, sorbitan monomyristate, sorbitan monopalmitate, sorbitan monostearate, sorbitan monooleate, sorbitan sesquiolate, sorbitan triolate and sorbitan monobehenate. The manufacturing method according to claim 20, wherein the manufacturing method is at least one type. 23. The polyoxyethylene sorbitan alkyl ester is at least one selected from polyoxyethylene sorbitan monolaurate, polyoxyethylene sorbitan monopalmitate, polyoxyethylene sorbitan monostearate, and polyoxyethylene sorbitan monooleate. 21. The manufacturing method according to claim 20. 24. The manufacturing method according to claim 15 or 16, wherein the organic compound is liquid paraffin having a kinematic viscosity of 7 to 95 cSt/40°C. 25. Organic compounds have general formulas ▲ Numerical formulas, chemical formulas, tables, etc. 17. The manufacturing method according to claim 15 or 16, wherein the silicone oil is at least one type of silicone oil represented by (n is an integer of 1 or more). 26. The production method according to claim 15 or 16, wherein the cationic surfactant is at least one alkylamine salt selected from monoalkylamine salts and dialkylamine salts. 27. The production method according to claim 15 or 16, wherein the cationic surfactant is at least one quaternary ammonium salt selected from monoalkylammonium salts and dialkylammonium salts. 28. The manufacturing method according to any one of claims 15 to 27, wherein the surface adhesion moisture of the coated resin particles is 0.1% by weight or less. 29. The manufacturing method according to any one of claims 15 to 28, wherein 6 to 25% by weight of the blowing agent containing the coated resin particles is subjected to a dissipation treatment. 30. Dry the coated resin particles to reduce the moisture attached to the surface by 0.5
16. After reducing the foaming agent to % by weight or less, the foaming agent contained therein is dissipated at a temperature lower than the foaming temperature of the resin particles.
Manufacturing method described. 31. The manufacturing method according to claim 15 or 16, wherein the removal of moisture adhering to the surface of the coated resin particles and the dissipation treatment of the foaming agent contained therein are carried out simultaneously.