JPS6334804A - Mixture for cable connection - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to a cable connection mixture used for connection parts of communication cables and the like.

(Prior Art) Conventionally, epoxy resins, polyester resins, polyurethane resins, etc. have been used as mixtures for cable connections.

(Problem to be solved by the invention) However, since mixtures using these resins have high two-strength physical properties, the joints cannot be dismantled, and are only used mainly for gas dams or for joints that do not require disassembly at all. Could not be applied.

The present invention provides a mixture for connecting cables that allows easy separation of connection parts of communication cables, etc., and has excellent disassembly workability.

(Means for Solving the Problems) The present invention provides that the mixing weight ratio of castor oil and polybutadiene polyol (castor oil/polybutadiene polyol) is 8/
Part A containing 30-50 weight percent of the polyol component and 70-50 weight percent of the plasticizer and 40-60 mff) percent of the polyisocyanate and a plasticizer inert to the isocyanate groups 6
Contains a B component containing 0 to 40 percent by weight and relates to a polyisocyanoplue connection blend.

The reason why the mixing weight ratio of castor oil and polybutadiene polyol (castor oil/polybutadiene polyol) as a polyol component of the present invention is set to 8/2 to 515 is that if the amount of polybutadiene polyol exceeds this range, the rubber of the cured product The elastic element becomes stronger and the comparative terms and conditions become thicker, but the elongation rate and tear strength increase and it becomes difficult to disassemble.Also, if the polybutadiene polyol is less than this range, the properties as triglyceride become dominant. , although the tearing strength is relatively weak.

This is because the hardness is high and the tensile strength is high, making it difficult to dismantle. Any known castor oil can be used. Polybutadiene polyol is a well-known compound made by polymerizing butadiene and having an allyl-type primary hydroxyl group with excellent reactivity at the end and a molecular weight of 70.
0-a, ooo.

The molecular weight is preferably zoo.

~3.000 1,4-polybutadiene polyol is used. Polybutadiene polyols are also called polyhydroxypolyfridienes9.

Pd-R-45HT made by Idemitsu Petrochemical Co., Ltd., Nippon Soda Co., Ltd. 1i! There are PBG-1000, etc. As the plasticizer used in Liquid A, saturated carboxylic acid esters obtained from aliphatic dicarboxylic acids and monoalcohols such as dioctyl phthalate, dioctyl sebacate, and dioctyl adipate are preferred.

In addition to the polyol component and the plasticizer, the A liquid also contains a polyol component and a plasticizer.

It may contain additives such as a curing accelerator, a flame retardant, a dehydrating agent, and an antifoaming agent. As a curing accelerator, amines such as triethylene amine, tetramethyl polymethylene diamine, and diazabicycloundecene are used.

Metal salts such as dibutyltin silaurylate and cobalt naphthenate are used. As a flame retardant.

tricresyl phosphate, ) lyxylenyl phosphate, cresyl diphenyl phosphate, xylenyl diphenyl phosphate, tris(chloroethyl) phosphate,
Phosphorous flame retardants such as tris(cycloglobil) phosphate are used. As the dehydrating agent, zeolite-based ones are preferred. For example, Molecular Sieve 3A, Molecular Sieve 5A, etc. manufactured by Union Showa Co., Ltd. are used.

As the antifoaming agent, silicone oil is preferred.

For example, 8603 manufactured by Shin-Etsu Chemical Co., Ltd. is used.

There are no particular restrictions on the types of these additives.

As the polyisocyanate used for B liquid.

Tolylene diisocyanate, diphenylmethane diisocyanate, naphthalene diisocyanate.

Polyisocyanates such as xylylene diisocyanate, diphenylsulfone diisocyanate, and triphenylmethane diisocyanate, and polyisocyanates blotted with phenols, imides, oximides, mercaptans, alcohols, etc., are used. Fertilizers that are inactive with respect to isocyanate groups used in Solution B include saturated carboxylic acid esters obtained from aliphatic dicarboxylic acids and monoalcohols such as dioctyl 7-talate, dioctyl sepacate, dioctyl adipate, and dibutyl phthalate. is used. AN and B
The liquids have the above-mentioned composition ratios from the viewpoint of the tear strength and electrical properties of the cured products.

The blending ratio of the polyol component and polyisocyanate is as follows:
The active hydrogen content of the polyol component is in the range of 1.0 to 1.8 equivalents. If this ratio is less than 1.0, the tensile strength and Shore A hardness of the cured product will be high and it will be difficult to dismantle. On the other hand, if the contact amount ratio exceeds 1.8, the surface tackiness of the cured product becomes large and workability tends to deteriorate.

(Effect of the invention) The mixture according to the present invention has a temperature of 9 normal working environment.
Casting can be easily performed in the range of 0°C to 40°C, and the cured product has mechanical properties that allow it to be dismantled and sufficient insulation.

The viscosity of the powder mixture according to the present invention at 10°C is 3.0O
OCI)S or less, and its cured product is.

Tensile strength is 3.0 kg as a mechanical property that can be dismantled.
f/am” or less, the tensile elongation rate is 30% to 100%
, tear strength is Q, from 5 kgf/cm to 20 kgf
/cm, Shore A hardness is in the range of 5 to 20, and 9 volume resistivity is 10 ItΩ-■ or more.

Water absorption rate is 0.3% or less.

Example 1 Castor oil (triglyceride mainly composed of ricinoleic acid, hydroxyl value 1601, molecular weight 920-935) 70 weight 1
and polyhydroxypolybutadiene (Pd-R-45HT manufactured by Idemitsu Petrochemical Co., Ltd., number average molecule [2,8001
30 parts by weight, 140 parts by weight of dioctyl sebacate, 17 parts by weight of curing accelerator, 0.1 part by weight of triethylenediamine,
0.2 parts by weight of silicone oil KS603 (manufactured by Shin-Etsu Chemical Co., Ltd.) was added.

Mix well, defoam, and seal airtight (N solution).

On the other hand, 25 parts by weight of carbodiimide-modified 4,4'-diphenylmethane diisocyanate (Millionate MTL, imide-blocked polyisocyanate, manufactured by Nippon Polyurethane Industries Co., Ltd.) and 25 parts of diocdel phthalate were mixed, defoamed, and then aerated. Seal tightly (liquid B). Before injection, mix both of them uniformly so that 1 equivalent of active hydrogen of the polyol component is added to 1 equivalent of isocyanate group of polyisocyanate.
．． (5 equivalents) The disassemblability was examined as in Kaoru 1 in Table 1.

Example 2 65 parts by weight of castor oil (triglyceride mainly composed of ricinoleic acid, hydroxyl value 1601, molecular weight 920-935), 15 parts by weight of polyhydroxypolybutadiene (PBG-1000 manufactured by Nippon Soda Co., Ltd.), polyhydroxypolybutadiene (Pd-R-45H manufactured by Idemitsu Petrochemical Co., Ltd.
T) 20 parts by weight.

100 parts by weight of dioctyl phthalate, 35 parts by weight of dioctyl adipate, 0.2 parts by weight of triethylenediamine as a hardening accelerator, and 1 part by weight of zeolite (manufactured by Union Showa Co., Ltd., Molecular Sheep 3A) as a dehydrating agent were thoroughly mixed and defoamed. Seal tightly (liquid A). on the other hand,
30 parts by weight of carbodiimide-modified 4,4'-diphenylmethane diisocyanate and 30 parts by weight of dioctyl phthalate are mixed, defoamed, and hermetically sealed (liquid B). Before injection, both were mixed uniformly and the disassembly property was examined as in 1 of Table 1 (1.15 equivalents of active hydrogen in the polyol component per 1 equivalent of isocyanate group in the polyisocyanate).

Example 3 67 parts by weight of castor oil (triglyceride containing ricinoleic acid as a main component, hydroxyl value: 1609 molecules [920-935)] and 28 parts by weight of polyhydroxypolybutadiene (Idemitsu Petrochemical Co., Ltd.'s Pd-R-45HT).

140 parts by weight of dioctyl phthalate, 0.1 part by weight of diazabicycloundecene as a curing accelerator, and 0.3 part by weight of 8603 (manufactured by Shin-Etsu Chemical Co., Ltd.) as silicone oil.

2 parts by weight of zeolite (Molecular Sheep 3A manufactured by Union Showa Co., Ltd.) as a dehydrating agent was thoroughly mixed.

Defoamer and airtightly seal (liquid A). On the other hand, 22 parts by weight of diphenylmethane diisocyanate (Millionate MT manufactured by Nippon Polyurethane Industries Co., Ltd.) heated to 50°C and 30 parts by weight of dioctyl 7 tallate are mixed, defoamed, and hermetically sealed (liquid B). Before injection, both were mixed uniformly (1.6 equivalents of active hydrogen in the polyol component per 1 equivalent of isocyanate group in the polyisocyanate), and the disassembly properties were examined as shown in yellow in Table 1.

As shown in Table 1 for disassembly, the cured product of the mixture could be easily removed by hand, and the joints could be disassembled, indicating excellent repairability.

Table 1 shows the physical properties of test pieces of the cured mixtures obtained in Examples 1 to 3. The test pieces were prepared according to the method shown below.

The materials according to the formulations of Examples 1.2 and 3 were mixed uniformly and thoroughly defoamed until all air bubbles were removed. Then, it is immediately poured into a mold that has been assembled in advance. After injection, the mixture is quickly sealed and the mold is left at room temperature for 48 hours at 23°C to harden the mixture. After that, disassemble the mold and take out the cured product 2
The test piece was left at 5±2°C and 601RH for 24 hours.

Table 1 Meal 1 Diameter 194111ff1. A cable with a diameter of 50 m+n is placed in the center of a PVC pipe with a height of C; After curing for 48 hours at room temperature, the surrounding PVC pipe was cut.

The breakability of the cured product was investigated.

Claims (1)

[Claims] 1. The mixing weight ratio of castor oil and polybutadiene polyol (castor oil/polybutadiene polyol) is 8/2 to 5.
/5 containing 30 to 50 weight percent of the polyol component and 70 to 50 weight percent of a plasticizer, and B containing 40 to 60 weight percent of a polyisocyanate and 60 to 40 weight percent of a plasticizer inert to isocyanate groups. A mixture for connecting cables comprising a liquid containing 1.0 to 1.8 equivalents of active hydrogen in a polyol component per 1 equivalent of isocyanate groups in polyisocyanate.