JPS61152373A - Synthetic resinous abrasive - Google Patents

Abstract

PURPOSE:To prevent minute powder of an abrasive from sticking to a synthetic resinous product so as to make the product look neat by mixing a specified useful substance with synthetic resin and regulating peculiar surface resistance of the abrasice below 10<10>OMEGA/cm. CONSTITUTION:One or more than two sorts of useful substances out of an antistatic agent (such as alkyl phosphoric acid, diethanol amino acid or the like) a surface active agent (such as dodecyl benzene sulfon acid or the like,) or a conductive filler (such as carbon black) are mixed with synthetic resin (such as non-saturated polyester resin). Then, synthetic resinous abrasive with peculiar surface resistance below 10<10>OMEGA/cm is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a synthetic resin abrasive material used in polishing methods that involve the generation of static electricity, such as dry blasting, barrel methods, and impeller methods.

(Prior art and its problems) Conventionally, the above-mentioned method has been used to remove burrs from synthetic resin molded products, and the abrasive materials used include carborundum, alundum, silica stone, and silica sand.

Hard abrasives such as glass peas and iron powder and soft abrasives such as synthetic resin and walnut powder have been used.

When using synthetic resin abrasives among the above.

Due to the friction between the abrasive and the air and the molded product, significant static electricity is generated during operation, and as a result, the abrasive with small particle size adheres to the molded product, causing problems in appearance.

This problem is not observed in conventionally used cut wire type materials such as nylon and polycarbonate.
This is unique to synthetic resin abrasives obtained by crushing molded products, which have recently begun to be used.

These synthetic resin abrasives include thermoplastic resins such as polyacetal resin, thermosetting resins such as unsaturated polyester resins, phenolic resins, and melamine resins. The particles are irregular in shape and have a large surface area, and are usually used by classification to obtain an appropriate particle size distribution for each application.

However, in the general classification method that employs sieving, etc., static electricity is naturally generated, and as a result, fine particles adhere to large particles and cannot be separated, leading to the above-mentioned problem.

The particle size distribution of the abrasive obtained by pulverization as described above can be set freely, and particles much smaller than conventional abrasives can be produced, so it is possible to manufacture ICs and LSIs that have not been used in the past.
Despite the fact that it can be used to remove burrs from precision processed products such as, it has not been fully put into practical use due to the above-mentioned problems.

(Means for Solving the Problems) The present inventors have made extensive studies to solve the above problems.

1) Adding or coating a conventional antistatic agent to the synthetic resin abrasive; 2) Adding or coating a surfactant to the synthetic resin abrasive.

3) Adding a conductive filler to the synthetic resin used.

As a result, the inventors have discovered that it is effective to lower the electrical resistance of a synthetic resin abrasive to a surface resistivity of 1010 Ω/country or less, and have arrived at the present invention.

That is, the present invention provides synthetic resin with one or two selected from the group consisting of antistatic agents, surfactants, and conductive fillers.
By blending more than one substance, the surface resistivity can be increased to 10
This is a synthetic resin abrasive material that is characterized by being adjusted to 10 Ω/min or less.

In the synthetic resin abrasive material of the present invention, useful substances among antistatic agents, surfactants, and conductive fillers can be used alone.

A preferred method is to adjust to a predetermined surface resistivity value by sharing them.

Examples of the synthetic resin used for producing the synthetic resin abrasive material of the present invention include thermoplastic resins such as polyacetal, thermosetting resins such as unsaturated polyester resins, phenolic resins, and melamine resins.

Among them, it is preferable to use unsaturated polyester resin.

The antistatic agents used in the present invention include alkyl phosphate ester salts such as alkyl phosphate jetanolamine salt and alkyl phosphate potassium salt, polyoxyethylene alkyl ethers such as polyoxyethylene oleyl ether, and polyoxyethylene alkyl ethers such as polyoxyethylene oleyl ether. Polyoxyethylene fatty acid esters such as oxyethylene stearate and polyoxyethylene glycol monostearate, quaternary amine salts such as lauryl trimethylammonium chloride, N.

The material is selected from substances having an antistatic effect, such as polyoxyethylene alkylamines such as N-dimethylethanolamine, and alkyl betaines such as lauryl betaine, and is used alone or in combination.

When coating these on a pulverized synthetic resin abrasive material, a method may be employed in which the antistatic agent is dissolved or diluted with an appropriate solvent, added or immersed, and then dried.

In addition, as surfactants, alkylbenzenesulfonic acids such as dodecylbenzenesulfonic acid, alkylbenzenesulfonates such as sodium dodecylbenzenesulfonate, alkylsulfate ester salts such as sodium lauryl sulfate, β-naphthalenesulfonic acid formalin condensation The material is selected from substances having a surface-active function such as naphthalene sulfonic acid formalin condensates such as sodium salts of Naphthalene, and is used alone or in combination. When coating pulverized abrasive material, it is sufficient to apply the coating in the same manner as in the case of antistatic agents.

Further, as the conductive filler, in addition to carbon such as carbon blank and graphite, metal powder such as aluminum powder, iron powder, silver powder, copper powder, nickel powder, tin powder, lead powder, and zinc powder can be used. When dispersing these fillers, various dispersion improvers, coupling agents, and antisettling agents may be added as necessary. These fillers may be used alone or in combination.

The effective blending amounts of the various antistatic agents, surfactants, and conductive fillers listed above vary depending on the materials used, so for example, based on the Examples and Comparative Examples described later, we have experimentally determined that the surface resistivity is 10'.

It must be determined to be Ω/c11 or less.

However, in general, per 100 parts by weight of the synthetic resin abrasive material, the antistatic agent is 0.05 to 2 parts by weight, the surfactant is 2 to 10 parts by weight, and the conductive filler is 0.5 parts by weight, for example in the case of carbon-based filler. ~5 parts by weight, 100~2 in case of metal powder type
00 parts by weight.

In the present invention, the blending of various substances refers to the above-mentioned substances,
A method of adding and mixing in the manufacturing process of synthetic resin abrasive materials,
Any method may be used to coat the resulting abrasive material.

Further, these substances may be used alone, but the effect can be further enhanced by using them in combination.

That is, for example, after a conductive filler is dispersed in a synthetic resin, an antistatic agent and/or a surfactant may be added or mixed.

The surface resistivity defined in the present invention is 1 synthetic resin 1
It is the electrical resistance per clI, and it can be measured by preparing a molded plate and using the usual method described below. For those whose surfaces were coated with an antistatic agent and/or surfactant after pulverization, the fine powder was usually classified to about 325 mesh passes, and a molded plate was prepared by pressing at 5 Q kg/ci and used for measurement.

(Example) Next, the present invention will be explained in detail with reference to Examples.

Surface resistivity is ULTRA MEGOHMMETERM
Measurement was carried out using ODEL 5M-10 under conditions of 20 parts and 70% humidity. The sample for measurement is 4 clIX 4 cMX
A 3 m long one was used. Further, one synthetic resin molded article was subjected to dry blasting, and the extent to which the abrasive was attached after blasting was visually evaluated.

Comparative Example Processing 1.5 mol of isophthalic acid, 3.0 mol of maleic anhydride, and 4.95 mol of furopylene gellicol, 180~
The temperature was maintained at 210°C, and the reaction was allowed to occur until the acid value reached 35.

This is referred to as unsaturated polyester (■).

Then, 43 parts of styrene was added to 100 parts of this product.
After adding 0.5 part of 6% cobalt naphthenate and 1 part of methyl ethyl ketone peroxide and mixing, the mixture was left at room temperature for 20 hours, and then heated at 80° C. for 3 hours. The obtained cured product was pulverized and then classified into 60 mesh passes and 100 mesh passes to obtain abrasive material I.

Example 1 An example in which an antistatic agent was added before curing is shown.

Abrasives 2.3 and 4 were obtained in the same manner as in Comparative Example by adding 0.1 part, 0.5 part and 1 part of lauryltrimethylammonium chloride to 100 parts of unsaturated polyester I, respectively.

Example 2 An example coated with an antistatic agent is shown.

Inglobil alcohol solution of lauryltrimethylammonium chloride was added to 100 parts of Abrasive I, respectively.
．． Abrasive materials 5, 6 and 7 were obtained by coating in amounts of 1 part, 0.5 part and 1 part.

Example 3 An example in which a surfactant was added before curing is shown.

Adding 1 part, 5 parts and 1 part of dodecylbenzenesulfonic acid to 100 parts of unsaturated polyester l, respectively,
Abrasive materials 8, 9 and 10 were obtained in the same manner as in the comparative example.

Example 4 An example coated with a surfactant is shown.

Abrasive materials 11, 12 and 13 were obtained by coating 1 part, 5 parts and 1 part of dodecylbenzenesulfonic acid on 100 parts of abrasive material I in the same manner as in Example 3.

Example 5 An example is shown in which a conductive filler is added before curing.

0.5 parts, 1 part, 1.5 parts, 2 parts, and 2.5 parts of Denka Black (manufactured by Asahi Denka ■) as acetylene black were added to 100 parts of unsaturated polyester, and polished in the same manner as in the comparative example. 1 materials 14, 15, 16, 17 and 18 were obtained.

Example 6 An example in which a conductive filler and an antistatic agent are used together will be shown.

To 100 parts of unsaturated polyester ■, acetylene black made by Asahi Denka ■, 1.0 part of Denka black and antistatic agent, 0.1 part of lauryl trimethyl ammonium chloride was added, and the same procedure as in the comparative example was made to prepare abrasive material 19. I got it.

Example 7 An example in which a conductive filler and a surfactant are used in combination will be shown.

Abrasive material 20 was obtained in the same manner as in Comparative Example by adding 1 part of dodecylbenzenesulfonic acid to 100 parts of unsaturated polyester (1), using 1.0 part of the above acetylene blank as a surfactant.

Evaluation method and results Table 1 shows the evaluation results for each of the abrasives 1 to 19.

Dry blasting was performed on a synthetic resin molded article, and the extent to which abrasive fine powder adhered to the surface of the object after blasting was visually determined.

(Effects of the Invention) As can be understood from the comparative examples and examples, if the synthetic resin abrasive material of the present invention is used, problems such as poor appearance due to adhesion of abrasive powder to the synthetic resin molded product will be avoided. is completely eliminated.

Claims (1)

[Claims] (1) Surface resistivity can be reduced to 10^1^0 by blending one or more substances selected from the group consisting of antistatic agents, surfactants, and conductive fillers with synthetic resin.
A synthetic resin abrasive material characterized by being adjusted to Ω・cm or less.