JPH08127694A - Pvc plastisol composition - Google Patents

Abstract

PURPOSE: To obtain a PVC plastisol composition excellent in storage stability at the ordinary temperature, giving PVC coatings having highly hard and insulating properties, and useful for the insulating coatings of high voltage power transmission lines, etc., by using a filling resin, a specific plasticizer, a reactive plasticizer, and a polymerization inhibitor in a specific ratio. CONSTITUTION: This composition comprises (A) 60-75 pts.wt. of a PVC paste resin, (B) 25-40 pts.wt. of a filling resin, (C) 10-30 pts.wt. of dinonyl phthalate or diisodecyl phthalate as a plasticizer, (D) 10-30 pts.wt. of trimethylolpropane trimethacrylate as a reactive plasticizer, and (E) 500-5000ppm of hydroquinone as a polymerization inhibitor.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION This invention relates to PVC plastisol compositions, and more particularly to PVC plastisol dip coating compositions.

[0002]

2. Description of the Related Art Underground pipes for high-voltage transmission lines are provided with a high insulation coating to ensure safety. However, the straight pipe section can be easily coated with a high insulation coating, but the joint section is complicated. Insulation coating is difficult because of its shape, and insulation coating with powder resin paint or dip coating of PVC plastisol is performed.

[0003]

However, the PVC plastisol as described above is mainly made of PVC paste resin and is made of a plasticizer, a stabilizer, a filler, a pigment and the like, but the PVC paste resin contains a surfactant. However, general PVC plastisols have high hygroscopicity and low electrical insulation, and are not suitable as insulating coatings for underground pipes of high-voltage transmission lines. In view of such drawbacks, the present invention provides a composition having an electric resistance value of 10 ¹² Ωcm or more even under immersion in water.

[0004]

According to the present invention, 60 to 75 parts of PVC paste resin and 25 to 40 parts of extender resin are used.
Part, DIDP or DI with low water absorption as a plasticizer
10 to 30 parts by weight of NP, 10 to 30 parts by weight of the reactive plasticizer to further improve the hardness of the cured product by further lowering the viscosity of the plastisol and improving the processability (dipping property), and then the reactive plasticizer In order to suppress the reaction at room temperature, a polymerization inhibitor and a polymerization initiator having a relatively high decomposition temperature are used.

[0005]

In general, a peroxide polymerization initiator is added to polymerize the reactive plasticizer, but the peroxide tends to gradually decompose even at room temperature to generate radicals and polymerize the reactive plasticizer. That is, there is a drawback that the reaction proceeds during normal temperature storage, the viscosity increases, and the sol gels and cannot be used for dip coating.

In order to improve this point, the present invention uses a peroxide having a relatively high decomposition temperature in order to delay the decomposition of peroxide at room temperature, and the peroxide is decomposed at room temperature to generate radicals. Also, by adding a polymerization inhibitor that catches this radical to the reactive plasticizer of 500 to 5000 ppm, the reaction at room temperature is suppressed, the viscosity of plastisol does not rise for a long period of 6 to 12 months at room temperature, and the dip It is possible to obtain a plastisol with a very low increase in viscosity during coating work, and when this sol is heated and cured at 200 ° C, it quickly becomes a melt and peroxide decomposes to generate radicals, which polymerizes the reactive plasticizer to a high degree. PV with hardness and high strength and insulation
It becomes C coating.

[0007]

Examples of the present invention will be described below. PVC paste resin 70 parts Extender resin 30 parts Plasticizer DIDP 30 parts Reactive plasticizer TMPT 15 parts (Polymerization inhibitor 2000 ppm is included) Thermal stabilizer 2.5 parts Chelator 1292 0.5 parts Polymerization initiator 0.2 parts Toner 1.0 part Viscosity of the above sol 3000 cps. When the above sol is heated at 200 ° C. for 12 minutes in a gear oven, hardness Joa A 93 ° elongation 240% tensile strength 220 kg / cm ² electrical resistance Dry 10 ¹⁴ Ωcm or more 5 days immersion in water 10 ¹² Ωcm or more high hardness, high A composition was obtained that was insulating but had good storage stability at room temperature and rapidly melted when heated.

[0008]

EFFECTS OF THE INVENTION According to the present invention, 1
The composition has an electric resistance value of 0 ¹² Ωcm or more. Further, it is possible to obtain a plastisol that does not increase in viscosity of plastisol for a long period of 6 to 12 months at room temperature and has an extremely small increase in viscosity during dip coating work. Then, it becomes a melt and peroxide decomposes to generate radicals to polymerize the reactive plasticizer to form a PVC coating with high hardness, high strength and high insulation.

Continuation of the front page (51) Int.Cl. ⁶ Identification code Office reference number FI Technical display area H01B 3/44 P

Claims (1)

[Claims] 1. In a PVC plastisol composition, 25 to 40 phr of an extender resin is used, 10 to 30 phr of dinonyl phthalate or diisodecyl phthalate is used as a plasticizer, and 10 parts of trimethylolpropane trimethacrylate is used as a reactive plasticizer. ~ 30p
and used hydroquinone as a polymerization inhibitor.
A PVC plastisol composition, which is used in an amount of from 0.00 to 5000 ppm.