JPS6227473A - Electrically conductive water paint - Google Patents

Abstract

PURPOSE:To provide the titled paint which has excellent antistatic performance and prevents the deposition of dust or corona discharge, by adding zinc oxide, a pigment and other additives to a specified composite base. CONSTITUTION:0.05-5.0mol (in terms of Al atom) or an aluminum compd. such as aluminum nitrate or aluminum sulfate is added to 100mol of zinc oxide. The mixture if fired at 800-1,100 deg.C to obtain zinc oxide having a specific resistance of 110OMEGA.cm max. 10-15% said zinc oxide, a pigment and other additives are added to a composite base prepd. by combining an epoxy resin and an emulsion type harder alone or together with a thermoplastic resin emulsion.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a conductive water-based paint vehicle that prevents dust adsorption and corona discharge due to its antistatic function, and particularly relates to highly utilized polymer emul 7. The molecular weight of the resin used as a coating is considerably higher than that of a solvent-based resin, so the physical properties after film formation are good. The demand for water-based paints is increasing as they are one of the products that can realize the recent social demands of pollution-free and resource-saving, along with their safety.

(Prior art) These emulsion paste resins include, for example, thermoplastic resins such as polyacrylic acid ester (PAE) or sesame copolymer, polyvinyl acetate (PVAC) or its copolymer, vinylidene chloride/vinyl chloride, etc. (PVDC
), polyvinyl 10 pionate (PVP), etc., thermosetting resins include epoxy resins, and elastomer latex forms such as chloroprene rubber (CR), styrene-butadiene rubber (SBR), and acrylonitrile-butadiene rubber (NBR). '), methyl methacrylate-butadiene rubber, etc. are used alone or in combination.

(Problems to be Solved by the Invention) A common feature of these polymer materials is that they all have high electrical insulation properties, and when they are made into paints, the paint film naturally tends to be electrically charged.

As a result, dust can be absorbed and contaminate the paint surface, and when a human body or object comes into contact with or rubs against the paint surface, corona discharge may occur, which can be harmful to the human body or pose a danger to low boiling point volatiles. It may be harmful.

(Means for Solving the Problem) The present invention involves the selection and combination of suitable emulsion emulsions in order to provide a coating composition based on such an emulsion, and correspondingly, the emulsions necessary for the coating film. 4, which is used as a conductive base material capable of exhibiting a wide range of conductive effects in fax/mm recording paper and various information recording papers for electrostatic recording, discharge recording, and communication recording, is coated with zinc oxide. The object of the present invention is to provide a conductive water-based paint that has the function of preventing dust adsorption and electric discharge by imparting tetraelectricity to the film.

The explanation will be given below in order of implementation.

Evokin resin emulsion single base conductor is used as a paint.
Aliphatic amine emul/100 (parts by weight, the same applies hereinafter), 3 butyl cellosolve, 1 water IO, 3 sodium acrylate as a viscosity imparting agent, 80 conductive zinc oxide, 20 Bengara, 2 low-temperature film forming aid, 217 parts in total. is the B material, and the Evokin contact i
1085 parts of Evoquin resin emulsion prepared by emulsifying 190 liquid bisphenol A/epichlorohydrin type Evoquin resin with a nonionic surfactant is used as agent A and prepared immediately before use at A/B=1/2. Next, as an epoxy resin emulsion/thermosetting resin emulsion composite base conductive paint, aliphatic amine emulsion 100,
Acrylic acid ester copolymer emulsion 200.7'Tilceron lube 3, water 10, sodium acrylate 4.24, electrolytic zinc oxide 120, pigment (toner) 30, low temperature film forming aid 3, total 470 as B agent, the above-mentioned Epokin Resin emulsion 1175 is prepared as agent A at A/B=1/4 immediately before use. The most suitable material for the thermoplastic emulsion as a composite emulsion for the Evoquin resin emulsion used in the above formulation is polyacrylic acid ester or its copolymer, polyvinyl acetate and its copolymer, and polyvinyl chloride. , vinyl emulsions such as polyvinylidene chloride have poor conductive efficiency. Furthermore, elastomer latexes such as styrene butadiene (SBR) and chloroprene (CR) are almost insulating, and there is no major difference in their state depending on the type and amount of conductive material. Within the scope of experiments, emulsions of polyacrylic acid esters or their copolymers are most suitable for practical purposes.

Zinc oxide, which becomes the base material for 2s electric, is made by using an aluminum compound such as aluminum nitrate, aluminum sulfate, aluminum chloride, or aluminum oxide as an activator for 100 moles of zinc oxide, and using an aluminum compound such as aluminum nitrate, aluminum sulfate, aluminum chloride, or aluminum oxide as an activator.
Tokuko Sho 55-, which has a volume resistivity of several ohms to several tens of ohms (7) when fired at 800 to 1100°C.
19896, Japanese Patent Publication No. 55-19897 K, it has a high degree of conductivity. Compared to conventional conductive zinc oxide using gallium, indium, etc. as an activator, zinc oxide with a specific resistance value of 100Ω・z max used in the present invention has a good resistance in the polymer emulsion coating film within the above range. It was discovered that it had a conductive effect, and the invention was completed.

This 4-electric water-based paint can be applied using normal water-based paint methods, such as brushing, wool roller or spraying. The coating can be applied to a wide range of applications that require anti-static properties, including concrete purchased structures in civil engineering and construction.

(Function) The volume resistivity of the paint film after a week of painting is 1 to 10X1 on average.
05Q-σ, which corresponds to the static electricity safety guideline 108Q-ω or lower by the Industrial Safety Research Institute of the Ministry of Labor. As a result of observing the practical conditions of the painted surface of the above conductive water-based paint, we found that there was no dust adhesion due to conventional charging, and no corona discharge occurred due to contact or friction, which is both aesthetically pleasing and safe. It was confirmed that it has excellent functionality.

Example formulation 1: Epoxy resin emulsion single paste compounded aliphatic polyamine emulsion (Kanebo NS/-
■Made by Master Craftsman Poljon EB-1) 10 Kq.

Butyl cellosolve 03 to 9, water α9Kq, sodium acrylate (manufactured by Showa Denko, product name Viscomate 5L-104)
)03 Kq, glycol antifoaming agent (BIC Marine■
Product name BYK-035) αIK9.4 with zinc oxide (
Manufactured by Honjo Chemical Product name: High conducti
ve Zn O) 8 K9, Bengara (Toda Color 16OR manufactured by Toda Kogyo ■) 2, total 2 L6 with 9 as B agent, liquid Evokin resin emulsion with epoxy equivalent of 190 (Product name: Meiko Polsion EA-1 manufactured by Kanebo NSC ■)
108 and 9 as A agent, A/B = 1/2 weight ratio was prepared and mixed immediately before use, and two months after pouring, a wool roller brush was applied to the concrete surface with a moisture content of 6% as measured by a dielectric constant moisture meter. A unit coating amount of α2KV was applied, and after drying to the touch, another application was performed in the same manner. The volume resistivity of the coating film is shown in Table 1 together with Example 2 and comparative coating film described below.

Blend 2: Epoxy resin/thermoplastic resin emulsion composite base Blend 9 Aliphatic polyamine emulsion (manufactured by Kanebo NNS ■, trade name: Polsion EB-1) 10 K
g, Acrylic acid ester copolymer emulsion (manufactured by Kanebo NNS, trade name Yodozo A'AD81)
20Kg, Putylceronelube α3KLi, water lKf, sodium acrylate (manufactured by Showa Denko, product name Viscomate 5)
L-104) α4 Kp, conductive zinc oxide (manufactured by Honjo Chemical ■Product name: High conductive Zn
O) 12 Kg, pigment (manufactured by Mikuni Shiki ■, product name: color toner), 3 odors, low-temperature film forming aid (product name: Texanol, manufactured by Mitsubishi Chemical ■) 03 and 9, total 47 Kq as B agent, epoxy resin emulsion (Kanebo N.S.) Product Name: Porjon EA-1 (manufactured by C) Mix IL75 with 9 as agent A at a weight ratio of A/B = 1/4 immediately before use, and apply the unit by spraying to another side of the concrete described in Formulation 1. Quantity α2KVrr? After applying it and drying to the touch, it was reapplied using the same method.

Formulation 3: Thermoplastic resin emulsion single base formulation (comparative data) Acrylic acid ester copolymer emulsion (manufactured by Kanebo NNS, trade name Yodozol AD81) 25Kg,
Putylceron Lube 02 to 9, water α3 to 9.3% methylcellulose aqueous solution α5Kq, conductive zinc oxide (manufactured by Honjo Chemical ■, product name High conductive Zn)
O) 10 K9, pigment (manufactured by Nippon Kagaku ■, trade name Chrome Green) 2 kg, low-temperature film forming aid (manufactured by Mitsubishi Chemical ■, trade name Texanol) 02 to 9, glycol defoamer (manufactured by Bic Marine ■, trade name BYK-) 035) αlK9.
Mix a total of 311L3Kf to make a thermoplastic resin emulsion single base compound paint, and apply unit amount α2 with a wool roller on the other side of the concrete described in Formulation 1 and 2.
KVr? It was applied at a rate of After the coating film was dry to the touch, variable coating was applied to the coated surface in the same manner. After a week of painting the formulations 1 to 3, ten measuring points were set on the painted surface at intervals of 50 crn, and the volume resistivity (Ω·crn) was measured using a resistance measuring device (electrometer). As shown in Table 1,
1 Table (Unit: Ω・6n) The surface of the conductive coating film of the present invention according to formulation 1.2 is ZI X 106 to 1i9 X 1
It was demonstrated that the resistance was in the 0'Ω·α range and could be used practically as a conductive paint. On the other hand, the comparison painted surface of Formulation 3 was in the range of 48 x 10" to ?6 x 10" ΩΦ, confirming that a composition based on a single thermoplastic resin emulsion could not achieve the conductive effect in the required range. Patent applicant: Chugai Shoko Co., Ltd. (and one other person)?

Claims (1)

[Claims] A composite base prepared by combining an epoxy resin with an emulsion-type curing agent alone or in combination with a thermoplastic resin emulsion has a specific resistance value of 100Ω・cm max. zinc oxide of 10
A conductive water-based paint made by mixing ~150% with pigments and other additives.