JPS5825088B2 - Plastic plastic bag - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for surface treatment of plastics to prevent charging of plastics, in which a transparent conductive layer of a metal complex is deposited on the surface of the plastics in a reaction bath.

In general, plastics are susceptible to static electricity, and products made from plastics, synthetic fibers, and plastic molded products are highly electrostatically charged. It is.

Conventional methods for preventing such static build-up have generally been to attach surfactants to the surface, but these methods are only temporary and the anti-static effect is lost due to friction, low humidity conditions, etc. It has the disadvantage of being degraded.

Although attempts have been made to use antistatic agents as a cross-wire system, none are perfect, and they also have the disadvantage of reducing transparency.

There is also a method of introducing hydrophilic groups onto the plastic surface, but this method has the drawback of being less effective in low humidity environments.

This invention is a surface treatment method that has almost no drawbacks that surfactants have, and involves depositing a transparent conductive layer of a complex compound on the plastic surface to prevent the plastic from being charged.

This method solubilizes metal salts such as palladium chloride, gold chloride, and silver nitrate and the mold release agent adhering to the plastic, and eliminates the deterioration of the adhesion of the antistatic agent to the plastic due to the water repellency of the mold release agent. An excess amount of stannous chloride relative to the metal salt is added to an aqueous solution containing a water-soluble organic solvent, which is added to reduce the surface tension of the antistatic agent on the plastic and improve wetting of the plastic. In addition, palladium, gold, or a silver/tin complex compound is produced by reaction, and stannous chloride, sodium stannate, and concentrated hydrochloric acid are added to the reaction solution to prepare a treatment solution, and the plastic is immersed in the treatment solution to treat the surface. transparent palladium, gold, or silver
A conductive layer of tin complex is adsorbed and deposited.

It has been found that when this conductive layer is deposited on the plastic surface, all the damage caused by static electricity on the plastic is semi-permanently removed, and it has almost no effect on properties such as hue and transparency.

Next, this invention will be explained in detail.

Example 1 1 g of palladium chloride, 100 ml of concentrated hydrochloric acid, 50 ml of distilled water
2 g of stannous chloride was added to a mixture of 11 methyl alcohol 15 o 1111 and reacted at room temperature for 10 to 12 minutes. , 7 g of sodium stannate, and 400 rul of concentrated hydrochloric acid are added to create a treatment solution containing a palladium-tin complex compound. The As resin as a substrate is immersed in this treatment solution at room temperature for 1 minute, and the palladium-tin complex is formed on the surface. After adhering the compound and washing thoroughly with water, an As resin with a conductive layer of a palladium-tin complex compound attached thereto is obtained.

Example 2 Gold chloride 1.51, concentrated hydrochloric acid 100ml, distilled water 50ml,
dichloride) in a mixture of 150 ml of ethyl alcohol
Add 22 grams of tin and allow to react at room temperature for 10 to 12 minutes. In this reaction solution, 48 g of stannous chloride, 71 grams of sodium stannate,
Add 400 ml of concentrated hydrochloric acid to obtain a treatment solution containing a gold-tin complex compound.

The As resin as a substrate is immersed in this treatment solution for 1 minute at room temperature to adhere a gold/tin complex compound to the surface, and after thorough washing with water, an As resin with a conductive layer of the gold/tin complex compound attached is obtained.

Table 1 shows a comparison of the effects of this invention with conventional ones.
Shown below.

Anionic surfactants were used as conventional antistatic agents.

The surface resistance volume resistivity is a value measured at an atmospheric humidity of 30% RH, and the frictional charging voltage is measured using a rotary static tester at an atmospheric humidity of 30% RH.

The transparency reduction rate was expressed as the reduction rate when the light transmittance of the untreated material was set as 100% using visible light.

It was confirmed that the antistatic effect can be obtained by setting the surface resistance to 1012 Ω or less, and that even if the reduction rate of transparency is 7% or less, it is not practical.

According to the surface treatment method of the present invention, the antistatic effect is better than that of ordinary antistatic agents, and even complex-shaped samples can be easily prevented. Since the conductor is transparent, it produces effects such as being able to see through the inside of the plastic.

Claims (1)

[Claims] 1. To an aqueous solution containing baladium chloride, gold chloride, or silver nitrate and a water-soluble organic solution, add stannous chloride in excess of the metal salt and react to form baladium, gold, or a silver-tin complex compound. A treatment solution is obtained by adding sodium stannous chloride and concentrated hydrochloric acid to the reaction solution, and a plastic is immersed in the treatment solution to form a conductive layer of palladium, gold, or a silver-tin complex on the surface. Surface treatment method for precipitated plastic.