JPS6038415B2 - Methacrylic resin composition with excellent antistatic properties - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a methacrylic resin composition having antistatic properties.

Methacrylic resin is widely used in lighting equipment, signboards, various decorative items, nameplates, etc. due to its excellent transparency, good mechanical properties, processability, and beautiful appearance of molded products, but its surface resistivity It has a property of being easily charged due to its extremely high

When a methacrylic resin has significant dust adhesion due to electrification, the appearance deteriorates, and optical properties such as lighting effects and transparency deteriorate. Conventionally, as a method of imparting antistatic properties to methacrylic resin, many additive kneading methods have been proposed in which additives such as surfactants and fatty acid esters of polyhydric alcohols are added and kneaded.

However, in order to obtain an antistatic effect, it is necessary to use 8 to 1 part of the additive to 100 parts of the resin, which significantly deteriorates the properties of the resin base. For example, due to a decrease in heat deformation resistance, a decrease in transparency, a decrease in thermal stability, etc., this resin cannot be used as a backing material even though it has excellent antistatic performance. The present inventors have diligently studied the above-mentioned problems and have arrived at the present invention. By adding a glycerin monofatty acid ester and an alkanesulfonate together,
They found that a methacrylic resin composition with excellent antistatic effects and a good balance of mechanical and thermal properties could be obtained with a small amount of blended leather.

That is, the present invention includes 100 parts by weight of methacrylic resin and 0.0 parts by weight of glycerin monoester of fatty acid having 10 to 18 carbon atoms.
5 to 5 parts by weight and the general formula (x is 0 to 9, R is a hydrocarbon group and has 4 to 15 carbon atoms).

) A sulfosuccinate compound and/or general formula represented by (X is 0 to 1) R is a hydrocarbon group and has 4 to 15 carbon atoms.

) is a methacrylic resin composition with excellent antistatic properties, comprising 0.05 to 5 parts by weight of a sulfoacetate compound. When the specific sulfosuccinate compound and/or sulfoacetate compound used in the present invention is used alone, the surface resistance of the product does not decrease even if 1 part by weight is added, and the adhesion of dust due to electrification is significant. .

When glycerin monofatty acid ester is used alone, when 1 part by weight is added, the surface resistance value decreases to 100 ohm, showing good antistatic properties, but the heat distortion temperature decreases significantly, making it impractical for practical use. This results in a significant narrowing of the temperature range used. However, when a sulfosuccinate compound and/or a sulfoacetate compound and a glycerin monofatty acid ester are added in combination, the surface resistance value can be lowered by adding a small amount, which cannot be predicted by using each alone. The glycerin monofatty acid ester that can be used in the present invention has 10 to 10 carbon atoms.
Glycerol monoesters of 18 fatty acids such as lauric acid, myristic acid, palmitic acid, stearic acid, montanic acid, oleic acid, linoleic acid, behenic acid and the like.

Usually, it may contain small amounts of diglycerides and triglycerides as by-products. The sulfosuccinate compound and/or sulfoacetate compound that can be used in the present invention has the general formula (X is ◯ to 9, R is a hydrocarbon group and has 4 to 15 carbon atoms).

) and/or a sulfosuccinate type anionic surfactant represented by the general formula (x is 0 to 15R is a hydrocarbon group and has 4 to 15 carbon atoms).

) can be used. Particularly preferred hydrocarbon groups include 2-ethylhexyl, n-decyl, n-lauryl,
n-cetyl, n-stearyl, nonylphenyl, x is 0
The range of 5 to 5 is preferable. Glycerin monofatty acid ester is 0.05 to 10 parts by weight of acrylic resin.
It is necessary to use 5 parts by weight, and if more than 5 parts by weight is used, the heat deformation temperature will decrease.

Alternatively, it may deposit and adhere to the surface of the mold during injection molding, significantly impairing the appearance of the surface of the molded product. It is necessary to use the sulfosuccinate compound and/or the sulfoacetate compound in an amount of 0.05 to 5 parts by weight, particularly preferably in a range of 1 to 3 parts by weight.

If it is used in an amount exceeding 5 parts by weight, the coloring will be significant and the product will not be usable. In order to exhibit the effects of the present invention,
It is necessary to use glycerin monofatty acid ester (■) together with a sulfosuccinate compound and/or a sulfoacetate compound leg. The blending ratio of A:B is 1:1 to 5:1,
A range of 2:1 to 3:1 is particularly recommended. If the sulfosuccinate compound and/or sulfoacetate compound foot is used in a larger amount than the glycerin monofatty acid ester, the antistatic effect commensurate with the amount of the sulfosuccinate compound and/or sulfoacetate compound cannot be achieved, A bell-off phenomenon is observed in the graph of the surface solid resistance value. This phenomenon is consistent with the fact that the surface resistance value does not decrease when a sulfosuccinate compound and/or a sulfoacetate compound is used alone, as described above. The methacrylic resin referred to in the present invention refers to a methyl methacrylate homopolymer, or a copolymer of methyl methacrylate and 2% by weight or less of an acrylic acid ester or a methacrylic acid ester, acrylic acid, methacrylic acid, styrene, acrylonitrile, etc. means.
Examples of acrylic esters that can be used include methyl acrylate, ethyl acrylate, and butyl acrylate, and examples of methacrylic esters that can be used include ethyl methacrylate, butyl methacrylate, and dichlorohexyl methacrylate. The composition of the present invention can be obtained by melting and rolling a methacrylic resin, a glycerin monofatty acid ester, a sulfosuccinate compound and/or a sulfoacetate compound using an extruder or the like. Another method is to produce methacrylic resin by adding part or all of a glycerin monofatty acid ester, a sulfosuccinate compound and/or a sulfoacetate compound during polymerization of raw material monomers. You can also do that. The methacrylic resin thus obtained has the characteristics of a low surface solid resistance value and a short charge decay half-life, and these effects are retained for a long period of time.

The composition of the present invention can be used as lighting equipment, electrical meters, covers and parts for electronic devices, meter covers, daily necessities, films, sheets, panels, etc., and can also be used as fibers.

In addition, opaque materials such as pigments, inorganic fillers, organic fillers, etc. can also be blended. Next, the present invention will be explained in more detail with reference to Examples. Example 1 To 91 parts by weight of methyl methacrylate containing 9 parts by weight of methyl acrylate, 4 parts by weight of glycerin monostearate and a sulfosuccinate compound represented by the general formula were added in Table 1.
The composition and amount shown in 2 were added and granulated by melt mixing using a 4-way extruder.

Using a 3 oz injection molding machine, the resulting pellet was molded into 15
A flat plate of 0x150x3 ribs was molded and its antistatic performance was measured. The results are shown in Table 1. The molding temperature during molding was 230°C, and the mold temperature was 6000°C. Table/Example 2 In Example 1, 5 parts by weight of glycerin palmithialate was used instead of glycerin monostearate, and the general formula 〇=■ R○ (C2 day 4○) x CCH2S was used instead of the sulfosuccinate compound.

The antistatic properties were measured in the same manner as in Example 1 except that the sulfacetate compound represented by 3Na was used in the composition and amount shown in Table 2.

The results are shown in Table 2. Table 2 When sodium alkyl sulfonate and sodium glycerin monofatty acid were not added, the surface resistivity was 2 x 60, and the half-life of charge decay (seconds) was 2.

As is clear from Tables 1 and 2, the effects of the present invention are clear. Example 3 Methyl acrylate3. 9 parts by weight of methyl methacrylate containing 3 parts by weight of glycerin monooleate and 2 parts by weight of the sulfoacetate compound having the composition of Example 2-4.
Part by weight was added.

Claims (1)

[Claims] 1. 100 parts by weight of methacrylic resin, 0.05 to 5 parts by weight of glycerin monoester of fatty acid having 10 to 18 carbon atoms, and general formula ▲ Numerical formula, chemical formula, table, etc. ▼ (X is 0 to 9 , R is a hydrocarbon group and has 4 to 15 carbon atoms.
shows. ) Sulfosuccinate compounds and/or general formulas ▲ Numerical formulas, chemical formulas, tables, etc. ▼ (X is 0 to 15, R is a hydrocarbon group, and has 4 to 1 carbon atoms)
5 is shown. ) A methacrylic resin composition having excellent antistatic properties and comprising 0.05 to 5 parts by weight of a sulfoacetate compound represented by the following formula.