JPS6213431A - Flexible resin composition for fabric pipe - Google Patents

Abstract

PURPOSE:A resin composition improved in flexibility, solvent resistance and bearing rusting resistance, prepared by mixing a polyester resin comprising an aliphatic dibasic acid and an aliphatic glycol with a caprolactone-modified epoxy resin and an aminoaldehyde resin. CONSTITUTION:A resin composition containing a polyester resin (A) containing an aliphatic dibasic acid and 10-40wt% aliphatic glycol, a caprolactone-modified epoxy resin (B) of the formula (wherein m is 1-6 and n is 1-9) and an aminoaldehyde resin (c) at such a ratio that the caprolactone-modified epoxy resin is used in an amount of 5-20wt%, based on the polyester resin, and the aminoaldehyde resin is used in an amount of 5-25wt%, based on the total amount of the resins [(A)+(B)+(C)]. Examples of the aminoaldehyde resin (C) used include melamine resins, urea resins and benzoguanamine resins.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a flexible resin composition for cloth pipes that has improved flexibility, solvent resistance, bearing rust resistance, etc.

Technical background of the invention and its problems] Oil-based resins, oil-modified alkyd resins, etc. have been used as varnishes for heavy pipes. However, since all of these resins contain fatty acids, they have essential drawbacks: 1. Large change in coloring during heat drying 2. Poor flexibility 8. 3. The Y change is large. 3. The solvent resistance is poor. 4. The bearing's rust resistance is large. 5. There is an oil smell. Up to now, various tests have been carried out in an attempt to improve these shortcomings, but no satisfactory results have been obtained.

[Object of the Invention] The object of the present invention was to eliminate the drawbacks of the conventional technology, and it has improved flexibility, solvent resistance, bearing rust resistance, less color change, and has no oil odor. The purpose of the present invention is to provide a flexible resin composition for cloth pipes that does not

[Summary of the Invention] As a result of extensive studies aimed at achieving the above object, the present inventor has developed an oil-free product in which a methylene long chain bond is introduced into the molecule to have an intramolecular plasticizing effect without using fatty acids. By using polyester resin of The present invention is based on the following: (△) Two aliphatic groups!, (, Polyester containing 10 to 401% of acid J3 and aliphatic glycol resin and (B)
Contains a caprolactone-modified epoxy resin represented by the general formula (where m is not an integer of 1 to 6 and n is not an integer of 1 to 9) and (C) an aminoaldehyde resin, and the caprolactone-modified epoxy resin is applied to a polyester resin. 5 to 20% by weight of aminoaldehyde resin to total resin ffl [(A) + (B)
+(C)] This is a flexible resin composition for filter cloth pipes, characterized in that it contains 5 to 25% by weight of each of I and D2.

The polyester resin (A) used in the present invention is an aliphatic dibasic acid represented by the general formula % formula % (where x is an integer of 4 to 10) and a general formula % formula % (where y is 4 to 10). It is a polyester resin containing 10 to 40i 1% of aliphatic glycol represented by the following integer. Examples of aliphatic dibasic acids include adipic acid, sebadinic acid, and dodecanoic acid, which may be used alone or in combination.
Use by mixing more than one species. In addition to aliphatic digroup II,
Acid components such as isophthalic acid, tetrahydrophthalic acid, fumaric acid, maleic anhydride, etc. are also used. As aliphatic glycols, 1.4-bublene glycol, 1.5-
Bentanediol, 1,6-hexylene diol, 1.
Examples include 10-decanediol, which may be used alone or in combination of two or more. Furthermore, in addition to the aliphatic glycols mentioned above, alcohol components such as nibrene gelcol, propylene glycol, diethlene glycol, neopentyl glycol, glycerin, trimethylolpropane, pentaerythritol, diglycerin, dipentaerythritol, and sorbitol are used. can do. (A) The aliphatic dibasic acid J3 and the aliphatic glycol occupying in the polyester resin are preferably in the range of 10 to 40% by weight based on the solid content of the polynisder resin.

If it is less than 10%, the flexibility will be significantly reduced, which is not preferable. Moreover, if it exceeds 40% by weight, the solvent resistance and film toughness will deteriorate and it will not be suitable for practical use.

As the caprolactone-modified epoxy resin (B) used in the present invention, ε-caprolactone is subjected to an addition reaction with a Tpolysiloxane resin, so a specific compound is Plaxel Gl 03. Praxel G104, Praxel G1
05 (both manufactured by Daicel Corporation, product name), etc.
These may be used alone or in combination of two or more. The blending ratio of the caprolactone-modified epoxy resin is preferably in the range of 5 to 20% by weight based on the solid content of the polyester resin.

If the blending ratio is less than 5% by weight, the flexibility and anti-corrosion effect on bearings will be reduced, and if it exceeds 20% by weight, drying properties will be reduced, which is not preferred.

As the aminoaldehyde resin (C) used in the present invention,
Melamine resins, urea resins, benzoguanamine resins, etc. are included, and these act as curing agents for the resin composition.
Specific examples include, for example, melamine resins such as Super Beckamine J-820 (manufactured by Dainippon Ink and Chemicals, trade name), Kneepan 208E-60, and Kneepan 220.
(manufactured by Mikata Car Pressure Chemical Co., Ltd., trade name), Bansemin 125-6
0 (manufactured by Harima Kasei Kogyo Co., Ltd., trade name), and these may be used alone or in a mixture of two or more.

The blending ratio of aminoaldehyde resin is 5% of the total resin solid content.
It is desirable that the content be in the range of ~25% by weight.

Blend 17J to 5 weight (If it is less than 1%, the drying properties and solvent resistance will decrease, and if it exceeds 25%, the resin will become hard, which is not preferable. Therefore, it is limited to the above range.

The flexible resin composition for cloth pipes of the present invention can be produced extremely easily by blending a polynisder resin, a caprolactone-modified epoxy resin, and an aminoaldehyde resin.
Usually, this resin composition is dissolved in a solvent and used as a varnish. Further, other additives may be added as necessary within a range that does not impede the effects of the present invention.

The flexible resin composition for cloth pipes thus obtained is used for impregnating varnish tubes used in electrical equipment and the like.

[Embodiment 1 of the Invention Next, the present invention will be explained with reference to Examples, but the present invention is not limited by these Examples.

Examples 1-2 The polyester resin components shown in Table 1 are placed in a flask, and the temperature is gradually raised while stirring in the presence of nitrogen gas.

1f The temperature rise rate is about 15°C per hour from 30°C to 230°C. When the temperature reaches 230°C, a small amount of xylene is added and the xylene is refluxed while maintaining the temperature at a constant temperature of 230°C to cause an esterification reaction, and the produced condensed water is removed from the system. When the acid value became 3 or less, heating was stopped and the reaction was terminated by cooling to obtain a polyester resin. After adding a solvent to this polyester resin and dissolving it,
Varnishes of Examples 1 and 2 were prepared by adding predetermined amounts of caprolactone-modified epoxy resin J3 and aminoaldehyde resin.

Comparative Examples 1-2 Polyester resins were obtained using the compositions shown in Table 1 in the same manner as in Example 1. Add a solvent to this polyester resin to dissolve it, then add aminoaldehyde resin,
Varnishes of Comparative Example 1.2 were each prepared.

Using the varnishes obtained in Examples 1 and 2 and Comparative Examples 1 and 2, a 3φ polyester sleeve was treated with varnish, and heated and dried at 1110°C for 20 minutes four times to produce a varnish dupe. About this varnish tube: bending resistance, oil resistance, moist heat resistance, dielectric breakdown voltage,
Tests were conducted for solvent resistance, flexibility, and bearing rust resistance. The results are shown in Table 2, and the remarkable effects of the present invention were recognized in all properties.

Each test was conducted in the following manner.

Bending resistance, oil resistance, heat and humidity resistance, and dielectric breakdown voltage are J
According to l5-C-2347.

Styrene resistance and xylene resistance were determined by immersing a varnish tube in styrene or xylene and determining changes in appearance. Flexibility is the end of 200m varnish tube 5c
m was fixed, 59 loaded eggs were suspended from the other end, and the amount of deflection from the fixed part was measured before heating and after heating at 150° C. for 24 hours.

Bearing rust resistance is determined by testing bearings and varnish tubes using NSK N5-7 grease at a temperature of 1.
Place the bearing in a beaker controlled to 70% relative humidity at 0°C, seal it, and then place it in a thermostatic cypress at 10°C for 2 months to determine the rusting/XL state of the bearing surface as the surface rusting area ratio (%). It was shown in

Table 1 (Varnish composition) Table 2 (Characteristics) [Effects of the invention] As is clear from the above explanation and Table 2, the flexible resin composition for cloth pipes of the present invention maintains its flexibility even over time. Excellent solvent resistance and bearing rust resistance. Since no fatty acids are used, there is no color change and no oily odor. Therefore, it is suitable for varnish duping.

Claims (1)

[Scope of Claims] 1 (A) aliphatic dibasic acid and aliphatic glycol
A polyester resin containing 0 to 40% by weight, and (B) a caprolactone-modified epoxy resin represented by the general formula ▲ Numerical formula, chemical formula, table, etc. ▼ (where m is an integer of 1 to 6 and n is an integer of 1 to 9) and (C) aminoaldehyde resin, containing 5 to 20% by weight of caprolactone-modified epoxy resin based on the polyester resin and aminoaldehyde resin based on the total resin amount [(A) + (B) + (C)]. A flexible resin composition for cloth pipes, characterized in that the composition contains 5 to 25% by weight of each.