JPH0240259B2 - DODENSEIKAAPETSUTOYORAUCHISOSEIBUTSU - Google Patents

Description

[Detailed description of the invention]

INDUSTRIAL APPLICATION FIELD OF THE INVENTION The present invention relates to backing compositions for use in conductive carpets. (Prior technology) Carbon black particles are blended into PVC resin manufactured by a paste method for use in conductive carpets.
Attempts to impart electrical conductivity have been widely made, but in order to obtain the desired volume resistivity or surface resistance, it is necessary to incorporate a large amount of carbon black, but carbon black has a large oil absorption capacity, and in particular , ketjen black, which has a high oil absorption capacity, is often used. (Problem to be solved by the invention) In such a case, carbon black particles
The plasticizer in the PVC composition paste was absorbed, and the viscosity of the paste became very high. When coating a carpet, the paste became blurred and air bubbles were involved, making it extremely difficult to process. The present invention solves the above problems by providing a PVC resin composition that has a viscosity sufficient for coating and has sufficient electrical properties to prevent static electricity. (Means for solving the problems) The present invention uses vinyl chloride resin (PVC) for paste.
Or 100 parts by weight of vinyl acetate-vinyl chloride copolymer resin (PVAc-PVC), 40-80 parts of dialkyl phthalate plasticizer whose alkyl chain has 7 to 10 carbon atoms.
1 to 10 wt % of a cationic surfactant containing a nitrogen-containing nonionic surfactant or a tertiary or quaternary ammonium salt as a main component, and 1 to 10 wt % of carbon black.
Contains 10wt%, and the number of carbon atoms in the alkyl chain is 7 to 10.
A PVC composition mixed with a composition () consisting of 30 to 60 parts by weight of toner using a dialkyl phthalate plasticizer as a dispersion medium, the viscosity of which is determined by a BM type viscometer (#4 rotor 6 rpm). The value at 20℃
25000c.p. or less, and the volume resistivity and surface resistance of the resin after gelling and melting by heating the paste are 10 ⁴
10 ⁶ Ω-cm and 10 ⁵ to ^{10 7} Ω. For PVC or PVAc-PVC, for example, 70 parts by weight of resin with average degree of polymerization () = 1500,
() = 30 parts by weight of PVC resin for bulking of 1000, 2-
92 parts by weight of ethylhexyl phthalate (DOP),
A tensile strength of 57.1 Kg/cm ² can be obtained by blending 4.5 parts by weight of carbon black and 5.5 parts by weight of other auxiliaries.
(Sheet thickness: Approximately 1.5 mm. Gelification and melting in an oven at 195℃ for 4 minutes, test method JISK-6300.) Phthalate-based plasticizers are widely used in paste processing due to bleedability and cost considerations. ing. Dialkyl phthalate plasticizers with short alkyl chains have poor storage stability of composition pastes;
Also, volatile raw materials are large. Furthermore, if the alkyl chain is too long, the compatibility with the PVC resin will be poor and the gelation rate will be delayed, making it difficult to incorporate a large amount of carbon black. Therefore, compared to general PVC compositions,
It is difficult to use in formulations containing carbon black, which requires a large amount of plasticizer. Because of these problems, it is desirable that the dialkyl phthalate chain has 7 to 10 carbon atoms. The amount of plasticizer blended is suitable for coating processing.
In order to maintain the BM type viscometer (#4, 6 r.pm) = 25000 cp/20°C or less, a plasticizer in the toner is also added, preferably in an amount of 90 to 105 parts by weight. In order to reduce costs, an inorganic filler may be added within a range that does not affect the viscosity and electrical properties. Also, 1 to 2 parts by weight of Ca-based heat stabilizer and a moisture absorbent may be added as necessary. Add composition (). The toner is made of highly conductive carbon black, e.g.
1 to 10 wt% of Ketjen black, a nitrogen-containing nonionic surfactant, or a cationic surfactant containing tertiary or quaternary ammonium salt as the main component.
Contains 10wt%, and the number of carbon atoms in the alkyl chain is 7 to 10.
A dispersion of a dialkyl phthalate plasticizer is deagglomerated from the carbon black particles using a roll mill, etc., and an adsorption film of the dispersant is formed on the surface of the carbon black particles to form a composition (), which is stable and has good fluidity. and mix () and (). To improve the fluidity and lower the viscosity of this toner,
This is also important because it reduces the viscosity of the PVC paste composition. For this purpose, the selection of a dispersant is important.In terms of adsorption to the Ketjen black particle surface, nonionic surfactants containing nitrogen atoms or cationic surfactants such as tertiary or quaternary ammonium salts are recommended. Since the agent was highly adsorbed on the particle surface, a stable adsorption film was formed and a toner with good fluidity was obtained. As mentioned above, the PVC paste composition () other than toner can be blended in advance with a mixer, and a predetermined amount of the composition () can be added thereto and mixed uniformly with low-speed stirring, or the composition () can be blended in advance with a mixer. and composition () are blended using a line mixer. (Example) The compositions, viscosity, and electrical properties of Examples and Comparative Examples of the present invention are shown below.

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Claims (1)

[Claims] 1. Vinyl chloride resin (PVC) for paste or vinyl acetate-vinyl chloride copolymer resin (PVAc-
PVC) 100 parts by weight, the number of carbon atoms in the alkyl chain is 7 to 10
A composition () consisting of 40 to 80 parts by weight of a dialkyl phthalate plasticizer, and 1 to 10 wt% of a cationic surfactant containing a nitrogen-containing nonionic surfactant or a tertiary or quaternary ammonium salt as a main component. Carbon black 1~
A PVC composition mixed with a composition () consisting of 30 to 60 parts by weight of a toner in which a dispersion medium is a dialkyl phthalate plasticizer containing 10 wt% and having an alkyl chain of 7 to 10 carbon atoms, The viscosity is measured at 20℃ using a BM type viscometer (#4 rotor 6r.pm).
25000 c.p. or less, and the volume resistivity and surface resistance of the resin after gelling and melting by heating the paste are 10 ⁴ to 10, respectively.
10 ⁶ Ω-cm, 10 ⁵ to ^{10 7} Ω.