JPS6094498A - Lubricant for electric wire embedded in electric cable - Google Patents

Abstract

PURPOSE:The titled lubricant making insertion operation of electric wire easy, having no bad influence on a material to cover electric wire, containing a water- soluble copolymer of (meth)acrylic acid and (meth)acrylic amide. CONSTITUTION:The desired lubricant containing preferably 0.7-2.0wt% aqueous solution of high polymer compound having a basic skeleton shown by the formula [R and R' are H, or CH3; M is H, or alkali metal salt; m+n are 10,000- 200,000 (either of m or n may be 0)]. The aqueous solution has preferably 500- 10,000cps viscosity at normal temperature and pickup to electric wire is 100- 300g/m<2> (covered area) calculated as the aqueous solution.

Description

[Detailed description of the invention] The present invention relates to a lubricant for entering electric wires and cables.

Electric wire cables are usually t! Until the installation, it is inserted into the electric wire piping, and after the electric wire piping is done on-site, it is inserted into the pipe.

In this case, it may be easy to insert the wire in a short pipe, or it may be difficult to insert the wire in a long or curved pipe work, requiring considerable effort and possibly destroying the wire. be.

In order to solve the above problems, a method has been adopted in which an a'71n agent is applied to the inside of the electric wire piping or the electric wire during work to give normal temperature to the electric wire piping or the electric wire, thereby preventing these 1-rals. Conventionally, paraffin wax, synthetic wax, animal and vegetable oil emulsions, silicone oil, and various soaps have been used as these lubricants, but these materials are generally used in small quantities. The lubricating effect is poor, and when used in a large area, the materials such as polyethylene, Kuaibo vinyl chloride, polyethylene, etc., which are covered with N4A wires, may deteriorate due to aging and deterioration.Furthermore, these materials Although it has a sufficient dη lubrication effect when the wire is inserted, it has the disadvantage that it hardens inside the pipe due to aging, and when the wire is pulled out (the resistance to the bow 1 is large and the lubricity is lost).

In order to solve the above problem, the present inventors investigated the lubricity of various compounds when inserting electric wire cables, and found that they used an aqueous solution of a specific polymer compound (it made the wire insertion work significantly easier and the wire coating was easier to coat). It was found that there was no negative effect on the material.

That is, the present invention relates to the formula: [wherein R and R' are each independently (1) or CH3, M is 1' or an alkali metal compound, and m+n
10,000 to 200,000 (similarly, one of m and n may be O)] as a basic bone nucleus, and the lubricant for electric wire cable entry includes a water-soluble compound.

The compound used in the present invention has a basic skeleton represented by the general formula: These compounds are monopolymers or copolymers of acrylic acid or methacrylic acid, monopolymers or copolymers of acrylamide or methacrylic amide, or copolymers of acrylic acid or methacrylic acid with acrylamide or methacrylic amide; or their salts with a molecular weight of 500 to 30
0,000, more preferably 10,000 to 200,000. The larger the In molecule, the better, and if it is small, the liquid film tends to break and the lubricity decreases, and it must be used at high temperatures, which is uneconomical. Furthermore, a large amount of unnecessary components will remain in the pipe.

Having a basic skeleton means that the above-mentioned polymer is partially cross-linked with a suitable cross-linking agent, such as methylene cross-linking with Polmarine, sprue cross-linking with polyethylene glycol, ester cross-linking with polyhydric alcohol, etc. It means i- which may be.

The compound used in the present invention is used in the form of an aqueous solution.

00cps1 more preferably 500-10000cps
It is. This viscosity is determined by a compound concentration of 0.5 to 100 wt ω%,
More preferably, it is carried out by selecting a compound that can be achieved at a concentration of 0.7 to 2.0% by weight.

The aqueous solution contains, in addition to the compound of the present invention, other lubricants such as high molecular weight polyalkylene glycols, antifreeze agents such as alkylene glycols, and agents that prevent polymer degradation caused by ultraviolet light such as ethylenediaminetetraacetic acid (EDTA).
．． 6-g de one bujilu p-cresol (BHT),
Inorganic fine powders such as thiourine, such as Erosyl, and solubilizing agents, such as methyl alcohol, may be added as appropriate.

The lubricant of the present invention may be sold in the form of a 0.5 to 10% by weight aqueous solution. In use, the lubricant may be applied to the electric wire itself to be inserted, or the lubricant may be applied to the inside of the piping and the electric wire may be inserted into the lubricant.

It is also possible to employ both means at the same time.

Attachment to electric wire @ mountain is 100 to 300 (+/
m2 (covered area).

When the lubricant of the present invention is used, the lubricity is improved compared to conventional waxes, animal and vegetable oil emulsions, and stone caps, and there is essentially no fear of corrosion or swelling of the wire sheathing material. , Piping] 2. Afterwards, there are very few solid components remaining in the piping, and the solvent (water) easily evaporates and disappears, which has a negative impact on electric wires and cables.

The present invention will be explained below with reference to Examples.

Example 1 Sodium polyacrylate (15 mol%)-polyacrylamide (85 mol%) copolymer (approximately 1,000,000 molecules
0) Dissolve 1 g uniformly in 99πβ of water with stirring. The viscosity of the obtained lubricant was once 2000c
ps (30”C).

The flattenability test of the obtained moisturizing agent against polyethylene 1F-3, J: and soft vinyl chloride was measured using an inclined static [q] friction measuring machine. The adhesion rate of the lubricant was 1 (in terms of solid content) per 1 m 2 of polyethylene or soft vinyl chloride.

The test results are shown in Table 1.

Smoothness test: Fix the test film (polyethylene and soft PVC) on a sample stand, place the sample stand on a tilting static friction measuring machine, gradually tilt the sample stand, and measure the tan of the inclination angle when the sample starts to slide.
This was taken as the coefficient of friction.

Next, we conducted an experiment on the deterioration of the wire coating material using the following method.

Polyethylene, soft vinyl chloride (red), soft vinyl chloride (black), and chloroprene were used as samples, and 5g of them were immersed in the above lubricant and left at 60°C for 300 hours/l. Weight change ratio (%) of the test materials. This was done by measuring. The results are shown in Table-2.

Support i1 Sodium polyacrylate (molecular weight approximately 5,000,000) 2J
was dissolved in 98ffβ of water. The resulting viscosity was 1500c
ps (30°C).

Using this lubricant, a smoothness test and a deterioration test for wire coating material were conducted in the same manner as in Example 1.

The results are shown in Table-1 and Table-2.

X 1 Sodium methacrylate (molecule m approx. 10000000) 0
．． 7g was dissolved in water and 99.3ml of cod. The viscosity of the obtained lubricant was 2000 cps (30°C). Using this lubricant, a smoothness test and a deterioration test for electric wire coating materials were conducted in the same manner as described in Example 1. The resulting knots are shown in Table 1J3 and Table 2.

11 Craftsman polyacrylamide (molecular weight approximately 5,000,000) 1.
5 (I) was dissolved in 98.5 ml of water. The viscosity of the obtained lubricant was 2000 cpS (30°C). Using this lubricant, the smoothness test and A deterioration test was conducted on the wire covering material.The obtained results are shown in Tables 1 and 2.

Comparative Example 1 The following was used as a commonly known Jun 8'J agent.

Prescription 1 m It Paraffin wax 20% Hardened beef tallow oil 10% Polyoxyethylene (degree of polymerization -2O) 10% Stearyl 1-chill water 60% The above lubricant was prepared, and its smoothness test and wire coating material deterioration test were conducted. The same conditions as in Example 1 were used.

The obtained results are not shown in Table-1 and Table-2.

Comparative Example 2 A test was conducted under the same conditions as in Example 1, using only distilled water as a comparison target for a wire coating material deterioration test. The results obtained are shown in Table 2.

Table-1 (friction coefficient) Table-2 (Wire covering material) (Numbers indicate weight variation%.)

Claims (1)

[Claims] 1. General formula: [In the formula, RJ3 J: and R' are each independently 1."
or CH3, M is H or an alkali metal, and m
+11 is a number from 10,000 to 200,000 (in which case one of m and n may be O)] as a basic example nucleus, and a lubricant for electric wire/cable inlet containing a water-soluble compound. 2. The lubricant according to item 1, wherein n is 5000 or more. 3. The lubricant according to item 1, wherein the compound has a viscosity of 100 to 100,000 cps as an aqueous solution with a concentration of 0.5 to 10.0% by weight.