JPH0764975B2 - Lightfast polyamide composition - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a light-resistant polyamide composition, and more particularly to a light-resistant polyamide composition suitable for fibers requiring light resistance.

(Prior Art) Polyamide has excellent physical properties and is widely used as a fiber, a film, and other molded articles. However, when it is used as a fiber for poor light resistance and exposed to sunlight, There are problems that the strength and elongation properties are deteriorated and the dyed product is discolored.

Conventionally, in order to improve the light resistance of polyamide, it has been performed to mix heavy metal salts such as manganese and copper into polyamide. For example, Japanese Patent Publication No. 59-50709 discloses polyamide fiber containing a copper compound. A fabric for automobile interiors has been proposed in which a fabric made of is dyed with a complex salt dye containing gold and which has improved fastness to light dyeing.

However, car mats, car seats, artificial lawns, tents,
When used as a fiber for applications such as nets and materials for civil engineering that are exposed to high temperature for a long time, sufficient light resistance cannot be obtained by only containing a copper compound. In addition,
Car seats are often lined with polyolefins such as polyethylene and polypropylene, so that heat is not easily dissipated to the outside, the backing material deteriorates due to heat and gas is generated, and the polyamide fibers on the seat surface are exposed to high temperatures. Deterioration and discoloration are easily promoted by this gas.

(Problems to be Solved by the Invention) The present invention is a molding having excellent light resistance, which does not cause deterioration in strength and elongation characteristics or fading of dyed products even when exposed to sunlight at high temperature for a long time. An object of the present invention is to provide a polyamide composition that gives a product (fiber).

(Means for Solving Problems) The present invention achieves the above object, and the gist thereof is as follows.
It is as follows.

Polycondensate B obtained by reacting polyamide with copper compound A as Cu at 30 to 1000 ppm and a diol compound represented by the following general formula, pentaerythritol and triphenylphosphite at a molar ratio of about 1: 1: 2 is 100. A light-resistant polyamide composition blended up to 5000 ppm.

[R ₁ and R ₂ represent a hydrogen atom or an alkyl group having 1 to 4 carbon atoms, and R ₃ represents a 1,4-phenylene group or a 1,4-cyclohexylene group. ] As the copper compound A in the present invention, inorganic acid salts and organic acid salts, such as cuprous chloride, cupric chloride, cuprous bromide,
Cupric bromide, cuprous iodide, copper sulfate, copper phosphate, copper borate, copper nitrate, copper acetate, copper stearate and the like are preferably used.

The diol compound represented by the above general formula for forming the polycondensate B is 4,4′-dihydroxy-diphenylmethane, 4,4′-dihydroxy-diphenyl-1,1-ethane, 4,4′-dihydroxy. -Diphenyl-2,2-propane (bisphenol A), 4,4'-dihydroxy-diphenyl-2,2-butane and the phenylene groups of these compounds are
A compound converted to a 1,4-cyclohexylene group is used, and bisphenol A is particularly preferable.

This polycondensate B is considered to be a polymer having the following repeating units.

The amount of the copper compound A to be added is 30 to 1000 ppm, preferably 100 to 500 ppm as Cu. If the amount of the copper compound A is too small, the light resistance improving effect becomes insufficient, and if it is too large, the polyamide is colored, which is not preferable.

The polycondensate B content is 100 to 5000 ppm, preferably
500 to 3000 ppm is suitable. If the amount of the polycondensate B is too small, the light resistance improving effect becomes insufficient, and if it is too large, the melt viscosity of the polyamide increases and the molding (spinning) properties deteriorate, which is not preferable.

The copper compound A and the polycondensate B may be added to the polyamide either during or after the polymerization of the polyamide.
Generally, a method of blending with polyamide chips and molding is adopted.

Typical polyamides to which the present invention is applied include aliphatic polyamides (including mixtures and copolymers) such as nylon 6, nylon 66, nylon 46, and nylon 610. It can also be applied to a polyamide having a group.

In addition to the copper compound A and the polycondensate B, the polyamide composition of the present invention includes a matting agent such as titanium dioxide, an antistatic agent, a heat-resistant agent, an antioxidant, an ultraviolet absorber, a transparency improving agent, and a coloring agent. Various additives such as an inhibitor can be added. In particular, it is preferable to use an alkali halide compound such as potassium iodide, potassium bromide, potassium chloride, etc. in combination as a coloring preventing agent because the coloring by the copper compound is suppressed.

The fiber from the polyamide composition of the present invention exhibits significantly superior light resistance as compared with conventional ones, and is preferably used in the above-mentioned applications where a high degree of light resistance is required.

(Examples) Next, specific examples will be described.

The measuring methods and evaluation methods in the examples are as follows.

Relative viscosity (ηr) 96% sulfuric acid was used as a solvent, and the concentration was 1 g / dl and the temperature was 25 ° C.

Lightfastness Treat the sample with a fade meter at 83 ° C for 100-300 hours,
The degree of discoloration and fading was evaluated on a scale of 5 with 5 being the best.

Coloring degree The coloring degree of the filament yarn was observed with the naked eye and evaluated in 3 grades with 3 being the best.

Possibility of operability Based on the degree of increase in melt viscosity of the polyamide composition, evaluation was made in 3 grades with 3 being the best.

Example: Nylon 6 chips of ηr3.05 were blended with the additives shown in Table 1 at the addition amounts shown in Table 1 (unit: ppm, copper compound as Cu) to prepare an extruder type melt spinning machine. Supplied, spun at a spinning temperature of 270 ° C, spun from a spinneret with 80 Y-shaped nozzles, cooled by blowing 18 ° C air, and applied with an oil agent by a two-stage oiling roller, and then taken out. A stuffer system was used for crimping and winding, and 1200d / 80f crimped yarn (BCF) was obtained. The conditions for drawing and crimping are: draw ratio 3.50, preheat temperature 130 ℃, air temperature 230
℃, air pressure 5.5kg / cm ² , processing speed 2000m / min.

The crimped yarn is tufted onto a polyethylene non-woven base fabric to make a fabric with a pile weight of 630 g / m ² , dyed in a gray or beige color with a complex salt dye containing gold, and backed with polyethylene (overlaying polyethylene film at 150 ° C. It was heat-treated) to obtain a car seat cloth.

Table 1 shows the operability, the coloring degree of filament, and the light resistance of the car seat fabric.

Nos. 1 to 5 and 11 to 13 are Examples, and Nos. 6 to 10 and 14 to 16 are Comparative Examples.

In Table 1, JPH-3800 is a hydrogenation product of bisphenol A, a polycondensation product of pentaerythritol and triphenylphosphite with a molar ratio of 1: 2 (manufactured by Johoku Chemical Co., Ltd.),
JPP-3300 is a polycondensate of Bisphenol A, pentaerythritol and triphenyl phosphite in a molar ratio of 1: 1: 2 (manufactured by Johoku Chemical Co., Ltd.), 2-MBI is 2-mercaptobenzimidazole, and Irganox 1010 is hinder. The dephenol type antioxidant (made by Ciba-Geigy) is shown.

(Effects of the Invention) According to the present invention, a molded article (fiber having excellent light resistance) which does not deteriorate in strength and elongation characteristics and does not discolor a dyed product even when exposed to sunlight at high temperature for a long time (fiber) ) Are provided.

Claims (1)

[Claims] 1. A polyamide containing copper compound A as Cu in an amount of 30 to 10
The diol compound, pentaerythritol, and triphenylphosphite represented by the following general formula at 00 ppm are approximately
100 to 5000 ppm of polycondensate B reacted at a molar ratio of 1: 1: 2
A blended lightfast polyamide composition. [R ₁ and R ₂ represent a hydrogen atom or an alkyl group having 1 to 4 carbon atoms, and R ₃ represents a 1,4-phenylene group or a 1,4-cyclohexylene group. ]