JPS6125811B2 - - Google Patents

Description

[Detailed description of the invention]

In the present invention, continuous fiber bundles or spun yarns of natural fibers, man-made fibers, synthetic fibers, or inorganic fibers such as glass fibers and carbon fibers are pretreated with a hot-melt powder polyester adhesive that is solid at room temperature, and then immediately extruded. The adhesive adhered to the surface of the fiber bundle is heated and melted using an extruder to uniformly coat only the surface of the fiber bundle, and then coated with molten synthetic resin, which strengthens the original strength of the fibers. The aim is to manufacture synthetic resin-coated fibers with excellent weather resistance and stain resistance by uniformly and firmly adhering synthetic resin only to the fiber surface without losing elasticity, elasticity, or flexibility. It is something to do. Conventionally, the method of coating the surface of untwisted or lightly twisted continuous fibers with synthetic resin is to immerse the fiber bundle as it is in a synthetic resin melt bath or a synthetic resin solution bath dissolved in a solvent, and then cool or heat dry it. manufacture or
Alternatively, a method has been adopted in which a solution or molten synthetic resin is directly coated on the fiber bundle using an extruder, but in either case, in the conventional method, the synthetic resin coats not only the surface of the fiber bundle but also the surface of the fiber bundle. The synthetic resin penetrates between the internal filaments and becomes fixed, which has the advantage of making the bond between the surface resin and the fiber bundle stronger, but since the synthetic resin penetrates into the fiber bundle and becomes fixed, the original strength and elongation of the fiber itself is reduced. In particular, the elasticity and flexibility of the fibers are impaired, and as a result, textiles made of such synthetic resin-coated fibers have poor durability when used in applications under harsh conditions under high loads that require high strength and elongation. There are drawbacks that degrade the quality of the fabric. In view of the above, the present invention has been developed by coating the fiber bundle surface with an adhesive using a powdered polyester adhesive that is solid at room temperature, heat-sealing the adhesive, and immediately applying a molten synthetic resin coating to the fiber bundle. The synthetic resin does not penetrate between the filaments, and the synthetic resin coating is applied only to the surface of the fiber bundle, improving the strength and elongation of the raw fiber bundle.
Weather resistant, without compromising elasticity or flexibility in the slightest.
The present invention was completed after confirming that synthetic resin-coated fibers with high stain resistance could be obtained.The present invention involves first treating fiber bundles with a powdered polyester adhesive at room temperature. Then, using an extruder, the powdered adhesive attached to the surface of the fiber bundle is heated and melted to uniformly adhere only to the surface of the fiber bundle,
Furthermore, the present invention provides a method for producing synthetic resin-coated fibers by adhesively coating the surface of a fiber bundle with a molten synthetic resin. The powdered polyester adhesive that is solid at room temperature used in the present invention is a hot melt adhesive mainly composed of thermoplastic copolymer polyester, with a melting point of 115 to 125°C, 135 to 150°C, or 160°C, depending on the purpose of use.
A compound that is stable at room temperature with a particle size of ~175℃ and a particle size of 1~200μ, such as PES-120P, 140P or 170P.
(all are trade names of hot melt adhesives manufactured by Toagosei Chemical Industry Co., Ltd.) are preferably used. Furthermore, since the adhesive is used as a powdered solid, no solvent is required, and the effective solid content is low at room temperature.
100% by weight (the following percentages are by weight unless otherwise specified)
It is. ), it is non-toxic, has no risk of ignition, and is free from environmental pollution, and has the advantage of not damaging the original texture of the raw fibers because it forms a flexible adhesive layer only on the surface of the fiber bundle. Next, the present invention will be explained in detail. FIG. 1 shows a schematic diagram of an embodiment of the apparatus used in the present invention, in which raw yarn 2 of a cake or cheese roll 1 is glued with a polyester hot-melt adhesive (for example, the above-mentioned PES-170P) that is solid at room temperature. The powdered adhesive is applied to the surface of the yarn 2 through a bath 3 of
First, the extruder 4 heats and melts the powdered adhesive to uniformly coat the surface of the fiber bundle, then immediately coats only the surface of the fiber bundle with the synthetic resin uniformly and firmly, and then stretches it using the tensioner 5. The manufacturing method is simple, and the synthetic resin is uniformly and firmly coated only on the surface of the fiber bundle by pre-treatment with the above-mentioned special room-temperature solid powder adhesive used in the present invention. Thus, the object of the present invention is fully achieved. The raw yarn used in the present invention may be any type of fiber, but nylon, polyester fiber, carbon fiber, and glass fiber are particularly suitable. As the synthetic resin for surface coating, vinyl chloride, acrylic, urethane, nylon, etc. are preferably used. The synthetic resin-coated fiber bundle obtained by the present invention exhibits its properties without losing the strength, elongation, elasticity, flexibility, etc. of the raw fiber bundle itself, and the texture of the raw fiber is not impaired by the coating resin. weatherproof, without
It has the advantage of improving heat resistance, cold resistance, and stain resistance. For example, when elongation is required, nylon is used as the raw material fiber bundle, when dimensional stability is required, polyester fiber is used, and when glass fiber is used as the raw material fiber bundle, the elongation is significantly reduced. Therefore, when carbon fiber is used, a synthetic resin-coated fiber with a large Young's modulus can be obtained. For example, a nylon fiber bundle obtained by using 1890 denier nylon as a raw material fiber bundle, treating it with the polyester adhesive described above, and further coating with 100% molten vinyl chloride compound, and thus manufacturing it by the method of the present invention. is 6720 denier, the amount of synthetic resin covered is 350% of the original yarn, and its tensile strength (Kg/3cm) is 110 kg in length, welder shear, 80 in length.
kg, welder peeling, vertical weight was 37 kg. The most suitable form of the fibers used in the present invention is a non-twisted continuous fiber bundle, but lightly twisted continuous yarns, spun yarns, or thick single fibers are also applicable. For example, single fiber 350 denier (d) to 1500 d/4
Book, full denier, 250d to 6000d, synthetic resin coverage
At 100 to 700% by weight, a synthetic resin-coated fiber bundle of about 500 to 42,000 d can be obtained. Example 1 Using the device shown in Figure 1, the number of single threads was 24.
210d nylon untwisted fiber bundle from cake
It was drawn out at a speed of 500 m/min and first fed into a polyester hot melt type solid powder adhesive (PES-120P manufactured by Toagosei Kagaku Co., Ltd.) bath at room temperature to adhere the powder adhesive to the surface of the nylon fiber bundle. The fiber bundle is then heated, fed into an extruder, and heated to melt and adhere the adhesion adhesive uniformly to the surface of the fiber bundle, then coated with molten vinyl chloride resin, taken out from the extruder, stretched, and wound onto a bobbin to manufacture. It is. The combined amount of the polyester adhesive and vinyl chloride resin adhered to the resulting vinyl chloride resin-coated nylon fiber bundle was approximately 100% by weight, and the thickness was approximately 100% by weight.
It was 420d. The resulting vinyl chloride resin-coated nylon fiber bundles are as shown in Table 1 below, as shown in Table 1 below. There is no decrease in tensile strength and elongation compared to vinyl chloride resin-coated nylon fiber bundles, and there is no decrease in tensile strength and elongation.
There is no decrease in strength in the surface abrasion test (1000 frictions) measured using the ``0849'' method, and the coating is uniformly and firmly adhered to the surface of the nylon fiber bundle, has flexibility, high elasticity, and is easy to weave. When made into a coarsely woven fabric, it has high weather resistance and stain resistance, and does not impair the feel of the nylon fiber bundle itself. Next, the measurement results for the products of the present invention and comparative products are summarized in Table 1.

[Table] From the results in Table 1, when using the nylon non-twisted fiber bundle of the present invention, compared to the same conventional nylon non-twisted fiber bundle coated with vinyl chloride resin, the room temperature and humidity are 25℃ and the humidity. As shown in Table 1, the tensile strength measured at 65% is almost the same as the product of the present invention, and the elongation of the conventional product decreases, but the product of the present invention shows no decrease in elongation. Furthermore, the results of the surface abrasion test showed that in the case of the present invention, there was no decrease in strength, whereas in the case of the comparative product, it was destroyed in the surface abrasion test, making it impossible to measure the strength. The reason for this is that the present invention has 100% resin attached only to the surface as shown in Table 1, whereas the comparative product does not dip in the synthetic resin solution even when extruded and coated in the synthetic resin solution. In both cases, the resin is coated only on the surface because it has penetrated into the inside of the fiber bundle.
It is significantly less than 100%, and as a result, the strength decrease in the surface abrasion test, which shows the properties of the surface, is so large that it can lead to destruction. The nature of this surface abrasion largely governs practical use and is the greatest advantage of the present invention. Example 2 Table 2 shows the results of a test conducted in the same manner as in Example 1 using the apparatus shown in FIG. 1 and a polyester filament fiber bundle.

【table】

[Table] As is clear from Table 2, the product of the present invention has greater heat resistance, cold resistance, and so-called weather resistance compared to the case where the core yarn is simply coated with synthetic resin (in this case, vinyl chloride resin). It can be seen that the resistance to rubbing is also extremely high. Therefore, the synthetic resin-coated fibers produced according to the present invention can be effectively used as raw materials for container bags, curing sheets for concrete, etc., windshield sheets, mesh use, etc. under severe conditions. However, the same is true for tensile strength and elongation in Table 1, but in Table 2, there is no significant difference between the present invention and the comparative example. This is because, both in the case of 1 and in the case of the comparative example, the tensile strength and elongation of the fiber itself used for the core yarn is not significantly reduced. Furthermore, as the thickness (total denier) of the raw yarn core yarn increases, the amount of coating resin deposited increases as shown in Table 2 when using a hot melt type powdered polyester adhesive and immediately applying it to an extruder. According to the present invention, it has been found that the

[Brief explanation of the drawing]

FIG. 1 shows a schematic diagram of one embodiment of the apparatus used in the present invention. 1... Cake, 2... Fiber bundle, 3... Adhesive bath, 4... Extruder, 5... Stretching section, 6... Product winding section.

Claims (1)

[Claims] 1. The fiber bundle is treated with a hot melt type powdered polyester adhesive that is solid at room temperature, and then the powdered polyester adhesive attached to the surface of the fiber bundle is first heated and melted to uniformly cover and bond only the surface of the fiber bundle. . A method for producing synthetic resin-coated fibers, which comprises immediately adhering and coating the surface of the fiber bundle with a molten synthetic resin.