JPS59145238A - Antistatic treatment solution for vinyl chloride resin - Google Patents

Abstract

PURPOSE:The titled treatment solution capable of imparting antistatic property inexpensively to a PVC substrate, obtained by graft-polymerizing a vinyl monomer or a vinylidene monomer with a rubbery trunk polymer of a low volume specific resistivity and dissolving the graft copolymer in a solvent. CONSTITUTION:A rubbery trunk polymer of a low volume specific resistivity is produced by copolymerizing 10-50wt% monomer containing about 4-500 alkylene oxide groups with 90-50wt% conjugated diene or acrylic ester. A vinyl monomer or a vinylidene monomer is graft-polymerized with the produced rubbery trunk polymer. 5-40pts.wt. produced graft copolymer is dissolved in 100pts.wt. solvent selected from the group consisting of ethyl acetate, methyl ethyl ketone, and tetrahydrofuran to obtain the antistatic treatment solution. When this solution is applied to a PVC substrate and dried, the surface electric resistivity of the substrate becomes about 10<10>-10<12> and is accorded with antistatic property.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to various types of light electrical appliances, their manufacturing equipment, handling and operation tools, clean room materials, household electrical appliances, casing materials such as acoustic decomposers, packaging materials, and even building materials. This invention relates to a unique antistatic treatment liquid that is applied to a vinyl resin plate or sheet to lower the surface resistivity of the plate or sheet and impart antistatic properties to it.

In Utility Model Application No. 57-107154, the present applicant graft-polymerized a vinyl monomer or a vinylidene monomer onto at least one side of a polyvinyl chloride resin base material to a rubber base polymer having a small specific volume resistivity. An antistatic synthetic resin laminate is provided in which the antistatic layer of the graft copolymer obtained by this method is integrated with heat and pressure. This is because although the above graft copolymer has excellent antistatic properties, the flexural modulus
In view of the fact that the above-mentioned graft copolymer has not yet been put to practical use in the above applications because it has poor moldability due to poor physical properties such as tensile strength and elongation rate, and is flammable and expensive, By combining the coalescence and vinyl chloride resin into one body under heat and pressure, the poor physical performance of the former is complemented by the latter, and its excellent control and properties are utilized as they are, making it suitable for use in the above-mentioned applications. It was planned.

Such antistatic synthetic resin laminates have outstanding antistatic effects and good physical performance, so they are extremely suitable as industrial materials such as the above-mentioned casing materials, packaging products, and even building materials. Since the laminate is made of a vinyl chloride resin base material and the above-mentioned graft copolymer integrated into one body under heat and pressure, even if the graft copolymer is laminated on both sides (11-I), the above-mentioned base material is exposed at the edges, and When these are joined to each other by welding to construct articles of various shapes, or when cutting is performed, it is inevitable that vinyl chloride resin will be exposed in the welded parts or cutting recesses, and therefore, this exposure It was also undeniable that this part caused a slight decrease in antistatic properties.

As a result of further research based on the above-mentioned prior art, the present inventors have found that the same antistatic effect as above can be obtained by applying the above-mentioned graft copolymer as a thin film to a vinyl chloride resin base material. With this knowledge, we were able to eliminate the above problems and further reduce the cost.The present invention is a novel antistatic property for vinyl chloride resin that was made based on this technical background. It provides a processing liquid.

That is, the present invention provides rubber bases with low specific volume resistivity, i-[glyphs obtained by graft polymerization of vinyl monomers or vinylidene monomers on the aggregates, and nail aggregates 5 to 40
6 parts by weight of a solvent selected from ethyl acetate, methyl ethyl ketone and tetrahydrofuran. Graft copolymers are obtained by graft polymerizing vinyl monomers or vinylidene monomers onto a rubber base polymer with a low specific volume resistivity as described above, and have a permanent antistatic effect (antistatic property). It is a transparent substance with This rubber backbone polymer contains 10 to 50% by weight of a monomer having 4 to 500 alkylene oxide groups and 9 to 9% of one or more monomers selected from conjugated dienes and acrylic esters.
The graft copolymer has an antistatic effect due to the fact that the phase of this rubber trunk body forms a bridge state with each other in the branch polymer phase during processing. This is said to be because the charge mainly diffuses and attenuates through the rubber base polymer phase. Moreover, since the alkylene oxide group is chemically bonded to the rubber backbone polymer, the antistatic properties will not deteriorate even after severe washing with water, thus ensuring a permanent antistatic effect.

The above-mentioned graft copolymer is soluble in a solvent such as ethyl acetate, methyl ethyl ketone, or tetrahydrofuran, and a liquid obtained by dissolving 5 to 40 parts by weight of the above-mentioned graft copolymer in 10 parts by weight of any one of the solvents is chlorinated. When the graft copolymer is applied to the surface of the vinyl resin substrate and the solvent is evaporated, a cured thin film of the graft copolymer is formed, and the surface electrical resistivity of the vinyl chloride resin substrate is increased to about 101 by the formation of this thin film.
0 to 1012 Ω) #! A'f'O- antistatic properties are imparted.

This application example will be explained based on the attached drawings. In Fig. 1, the above liquid material is applied to both sides of a vinyl chloride resin substrate 1 having a thickness of 1 to 10 using a roll coater, a flow coater, a brush coating, etc., and there is no particular limitation. The thickness is about 20~200mm
A thin film 2.2 of the above-mentioned graft copolymer having a diameter of μ (microns) is shown. In addition, FIG. 2 shows a thin film similar to that described above on the end face of a vinyl chloride resin substrate 1 (laminate disclosed in the above-mentioned Utility Model Application No. 107154/1983), which has a coating layer 8.8 of a graft copolymer integrated on both sides by heat and pressure. 2. What led to the formation of 2.
Furthermore, FIG. 8 shows the same thin film 2 formed on the welded joint between the substrates 1' and 1 used in FIG. A thin film 2... is similarly formed in the cut recess of No. 1, respectively. The application example shown in FIG. 1 is similar to the prior art in which the coating layer of the laminate is replaced with the thin film 2.2, but the surface electrical resistivity is sufficiently low to exhibit antistatic properties, and the thin film 2. The adhesion to the substrate l of .2 is also extremely strong,
Therefore, the thin film 2 can be used for the same purpose as the above-mentioned laminate, and the graft copolymer, which is the substance of the antistatic substance,
．． 2, the actual usage of the graft copolymer is required to be reduced, which adds cost advantages. It goes without saying that a thin film of the graft copolymer can also be formed on the end surface of the substrate 1 in the example shown in the figure, and when the entire outer periphery of the substrate 1 is covered with a thin film in this way, in addition to the above-mentioned coating method, a dipping method can also be used. Needless to say, it is possible. In the application example shown in FIGS. 2 to 4, the treatment liquid of the present invention is applied to the exposed portion of the vinyl chloride resin of the laminate 1' according to the prior art to form a thin film 2 of the graft copolymer. It is easy to understand that this complements the antistatic properties of the laminate 1', and therefore the treatment liquid of the present invention is extremely suitable for imparting local antistatic properties. Although not shown in the drawings, even if an object made of vinyl chloride resin that has already been formed is to be subjected to antistatic treatment, the purpose can be achieved by simply applying the treatment liquid of the present invention, and even complex shapes can be treated. But it is absolutely possible.

Furthermore, is the material of Plus Deck better than before? Conductive paints or surfactants are used as surface treatment agents for Id electrical protection coatings, and the former are generally colored with carbon, etc., so they cannot be used in applications that require translucency. can be,
On the other hand, the latter has problems such as a large degree of atmospheric humidity and loss of antistatic properties after washing with water. Since the thin film is a transparent material, the hue of the substrate 1 can be preserved as it is, and as mentioned above, the antistatic properties will not deteriorate even after severe washing with water, so delamination between the thin film and the substrate 1 will not occur. As long as permanent? It has a Vm preventing effect, and it can be said that the treatment liquid of the present invention far exceeds conventional antistatic surface treatment agents in these respects as well.

Next, Table 1 lists Examples of the present invention together with Comparative Examples for comparison and contrast.

(Margin below) (Table 1) (Note) ×1. The graft copolymer according to the present invention was dissolved in various solvents, and its solubility was visually determined.

X 2. A solvent in which the graft copolymer was dissolved was applied to both sides of a vinyl chloride resin plate with a thickness of 5 to 100 ml.
The surface electrical resistivity was measured for a thin film of the graft copolymer having a thickness of 200 μm.

×3. Adhesion was determined by the cross-cut test method, and O...
Good, △: Fairly good, ×: Not good.

Table 1 (7) Comprehensive evaluation revealed that ethyl acetate, tetrahydrofuran and methyl ethyl ketone were the most suitable solvents for the graft copolymer. Furthermore, if the amount of graft copolymer dissolved in 100 mfit parts of the solvent is less than 5 parts by weight, it will be difficult to ensure a sufficient thickness of the anti-tg coating film, whereas if it exceeds 40 parts by weight, treatment will be difficult. The viscosity of the liquid becomes high, which makes workability difficult and tends to result in a film that is thicker than necessary.

As described above, the treatment liquid of the present invention is an extremely useful antistatic agent for vinyl chloride resin materials and molded products thereof, and has extremely high utility value.

[Brief explanation of the drawing]

1 to 4 are longitudinal sectional views showing an example of application of the present invention. (Explanation of symbols) 1... Vinyl chloride tree 88 substrate, 1... Small material, 2...
- Thin film of graft copolymer, 3... Covering layer of graft copolymer. One or more -

Claims (1)

[Claims] 1. 1 part of a 5 to 40 weight F graft copolymer obtained by graft polymerizing a vinyl monoclaw or a vinylidene monomer to a rubber base polymer with a small specific volume resistivity is mixed with etynopex acetate methyl ethyl ketone and tetrahydrofuran. An antistatic treatment liquid for vinyl chloride resin, characterized in that it is formed by dissolving 100 parts of a selected kind of solvent.