JPS6123316B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a method for backing a rug made of woven fabric or non-woven fabric, and more specifically, the present invention relates to a method for backing a rug made of woven or non-woven fabric, and more specifically, a dispersion of a polymer having a glass transition point of 20 to 80°C or a blend containing the same as a main component is applied to the back side of the rug. After coating on the target or entire surface, the glass transition point is 0 to 15.
A method for backing a rug, characterized by partially or completely applying a polymer dispersion or a mixture containing it as a main component at a temperature of °C, drying, overlaying a secondary base fabric, and heat-molding. The purpose is to provide a rug that has durability, can be given a certain shape, and has good thermocompression bondability with a secondary base fabric. Conventionally, the so-called buckling method, in which the back side of a rug is treated with synthetic resin or synthetic rubber, has been widely used in order to impart durability to the rug. However, as the uses of rugs expanded and they began to be used in places where the floor was not flat, such as the interior of a car, it became necessary to shape the rug to match the shape of the floor, and the conventional bucking technology It is becoming impossible to satisfy this demand. Furthermore, in addition to the performance that can be formed into automobile rugs, secondary base fabrics such as thick felt-like materials are efficiently formed and heat is applied to the rug at the same time in order to provide heat insulation, sound insulation, elasticity, etc. It is desired that it can be fused. In order to simultaneously satisfy such moldability and heat sealability, it has been proposed to form a covering layer of thermoplastic synthetic resin such as polyethylene on the back surface of the rug. However, this method has a limitation in that it cannot meet the basic performance of the rug, such as preventing thread removal from the rug's vile, unless it is processed by the conventional backing method prior to coating with the thermoplastic synthetic resin. In view of these current circumstances, the present inventors simplified the complicated two-step method of coating with a thermoplastic synthetic resin in addition to the conventional backing process, and easily improved the durability, shapeability, and thermal bonding of rugs. As a result of various studies on banging methods that satisfy the three sexual demands,
The present invention has now been completed. That is, in the present invention, after applying a dispersion of a polymer having a glass transition point of 20 to 80 degrees Celsius or a composition containing the polymer as a main component to the back side of the rug, the glass transition point is 0 to 80 degrees Celsius. A method for backing rugs consists of partially or fully applying a polymer dispersion at 15°C or a blend containing it as a main component, drying, overlaying a secondary base fabric, and heat-molding. This is what we provide. The most important part of the present invention is that two types of polymers with different glass transition points are separately coated on the back side of the rug in order to satisfy the conflicting demands of moldability and heat sealability.
It's about bashing. In other words, a polymer with a high softening point is desirable for shaping and stably holding it, and a polymer with a low softening point is advantageous for heat fusion. In order to maintain this, it is said that it is necessary to be able to form and heat-seal at a temperature of 120°C or less. Under these heat treatment conditions, in order to satisfy the conflicting demands of formability and heat-fusibility, it is necessary to use a hard polymer with a glass transition point of 20 to 80°C on the back side of the rug and a hard polymer with a glass transition point of 0 to 15°C on the back side of the rug. A key feature of the present invention lies in the discovery that separate coating and backing of the soft polymer is necessary. If the glass transition point is outside this range, for example if the glass transition point of the hard polymer is less than 20° C., the shaped rug will gradually lose its shape and its shape stability will decrease. On the other hand, if the glass transition point exceeds 80°C, high temperatures are required to heat, soften, and shape the material, which may damage the fiber material of the rug. Furthermore, if the glass transition point of the soft polymer exceeds 15°C, the thermal adhesion with secondary base fabrics such as felt will be poor, and the glass transition point will be 0°C.
If it is less than this, there will be disadvantages such as a decrease in the imprinting effect, and the object of the present invention cannot be satisfied. The glass transition point in the present invention is the temperature at which the specific volume, specific heat, refractive index, thermal conductivity, dielectric constant, elastic modulus, etc. of a polymer changes discontinuously, and can be easily determined by differential thermal analysis. can be measured. The glass transition point of the polymer used in the present invention is important, and the composition itself is not particularly limited. Examples of so-called hard polymers with a glass transition point of 20 to 80°C include vinyl acetate, styrene, and methacrylic acid. Single or copolymers containing monomers such as methyl and vinyl chloride as main components are preferred, such as polyvinyl acetate, polyvinyl chloride emulsion, styrene-acrylic ester, vinyl chloride-acrylic ester, and vinyl chloride-vinyl acetate. Examples include ethylene copolymer emulsion. The so-called soft polymer having a glass transition point of 0 to 15°C is preferably one copolymerized with the above monomers such as ethylene, acrylic ester, vinyl ester, etc. For example, vinyl acetate-acrylic ester, vinyl acetate-ethylene, vinyl chloride, etc. -Vinyl acetate-ethylene copolymer emulsion, etc. Note that, for example, vinyl chloride-vinyl acetate-ethylene copolymer emulsion is exemplified as both a hard polymer and a soft polymer, but this is due to differences in their composition ratios, etc. Such a hard and soft polymer can be used as a dispersion as it is or as a mixture with various additives such as thickeners, fillers, colorants, flame retardants, and dispersants. The rug used in the present invention is a rug made of woven fabric or non-woven fabric, and the fiber materials include wool, rayon,
Natural or synthetic fibers such as polyacrylonitrile, polyamide, polyester, polypropylene, and polyvinyl chloride are used, and the structure of the rug is not particularly limited, but it is generally called tufted carpet or needle punch carpet. . When applying a dispersion (or mixture) of the above-mentioned hard and soft polymers with different glass transition points, first apply the hard polymer, dry it appropriately if necessary, and then apply the soft polymer. The principle is to do so. The basic application method is to apply a hard polymer to the entire surface of the back of the rug, and then overcoat the coated surface with a soft polymer. It is also effective to apply only one layer to the entire surface and partially apply the other layer, for example, in a striped or mesh pattern. Of course, even in such cases, the principle is to apply the hard polymer first. In order to obtain the desired effect in the present invention, the coating amount of the polymer is important, and generally the total amount of both hard polymers is selected as a solid content in the range of 100 to 1000 g/m ² . The composition of the amount of polymer applied is as follows:
It is preferable that either of them accounts for 30% or more by weight of the total of the two types. The desired durability of the rug can be obtained by applying and drying the above-mentioned polymers, but shaping and heat fusion with the secondary base fabric are performed by heating and molding the applied rug. . That is, the rug obtained by applying both of the above-mentioned polymers and drying if necessary is heated with hot air,
After preheating to 80 to 120°C using infrared rays or other methods, a secondary base fabric (including felt, cotton shavings, juute, etc.) is applied to the coated surface, and pressure is applied using a cooled mold with an arbitrary shape. Shaping and heat-sealing are performed by methods such as tightening and shaping, or pressing with a heated mold and cooling the mold in the pressed state. Thus, the rug backed by the method of the present invention has durability, and by overlapping and pressing the secondary base fabric, an arbitrary stable shape and a strong integration of the secondary base fabric can be achieved. Ru. Hereinafter, the present invention will be explained with reference to Examples. Example 1 Sodium polyacrylate was blended with a vinyl chloride-vinyl acetate-ethylene copolymer emulsion having a glass transition point of 20°C to prepare a composition having a solid content of 30% by weight and a viscosity of 5000 centipoise. The above composition was applied by a roll coater method to a needle punch carpet having a basis weight of 600 g/m ² made of polypropylene fibers formed into a web by a needle punching method, and dried in a hot air circulation dryer at 110°C. The coating amount of the above composition at this time was 300 g/m ² in terms of solid content. Next, a vinyl acetate-ethylene copolymer emulsion having a glass transition point of 5° C. was applied on top of this by a spray method at a dry solid content of 150 g/m ² .
It was dried in a hot air dryer at 110°C. The thus obtained carpet was heated in hot air at 120℃ for 10 minutes.
After preheating for a few minutes, a felt made of cotton waste is applied to the coated surface and pressed for three minutes using a pair of molds with uneven shapes. After cooling, the carpet is taken out to improve the shapeability of the carpet and the heat fusion with the felt material. Performance tested. The results are shown in Table 1. Example 2 A blended composition was prepared in the same manner as in Example 1 except for using a vinyl chloride-vinyl acetate-ethylene copolymer emulsion with a glass transition point of 30°C,
The carpet was treated in the same way. Next, a vinyl acetate-ethylene copolymer emulsion with a glass transition point of 15°C was treated in exactly the same manner as in Example 1, and the resulting carpet was also tested for formability and heat-fusibility in the same manner. I went there. The results are shown in Table 1. Comparative Examples 1 to 4 Carpets were treated in the same manner as in Example 1 using polymerized or copolymer emulsions having the glass transition points shown in Table 1, and each of the resulting carpets was treated in exactly the same manner. Moldability and heat fusion properties were tested. These results are shown in Table 1.

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Claims (1)

[Claims] 1 After partially or completely applying a dispersion of a polymer with a glass transition point of 20 to 80°C or a compound containing it as a main component to the back side of the rug, the glass transition point is 0 to 15°C. A method for backing a rug, which comprises partially or fully applying a polymer dispersion or a mixture containing the polymer as a main component, drying, overlapping a secondary base fabric, and heat-molding.