JPH0528661B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to a cold-proof or waterproof clothing fabric. It is an object of the present invention to provide a clothing fabric that is highly flexible, lightweight, and water-impermeable like clothing fabrics generally made of cloth.

(Prior Art) Flexible, lightweight, and water-impermeable clothing fabrics are suitable for making diving clothing and winter clothing. Clothes made from such fabrics are
Already on sale. The fabric is one or both sides of a sheet obtained by foaming chloroprene rubber, with a fabric made of knitted or jersey attached to it. The fabric contains chloroprene rubber to make it impervious to water.
Since chloroprene rubber has poor tear strength and is susceptible to aging, the fabric has the disadvantage that it tends to tear when exposed to sunlight or wind and rain. Also,
Fabrics with stockinette or jersey pasted on only one side of a foamed chloroprene rubber sheet,
It was often worn with the rubber side facing the skin, but this made the rubber surface less slippery, and powder had to be used to make it slippery. The drawback was that the rubber adhered to the skin, causing a rash.

To prevent chloroprene rubber from aging,
Mixing carbon black as a filler was carried out. However, even with the addition of carbon black, the tear strength and aging resistance could not be significantly improved. Not only that, but when carbon black is mixed, the color is limited to black, and a new drawback arises in that it is not possible to create any color.

Further, in conventional rubber fabrics, since rubber has poor tear strength and easily ages, it was necessary to thicken the rubber layer and attach knitted or jersey fabrics to both sides. When the rubber layer is made thicker and knitted or jersey fabric is laminated on both sides, the fabric becomes thicker and inevitably loses its flexibility. As a result, the fabric was suitable for use in surfing or diving clothing, but was not suitable for general clothing.

(Problems to be Solved by the Invention) This invention aims to improve the aging resistance and flexibility disadvantages associated with rubber foam and to provide a fabric that can be used as general clothing. be.

The inventor attempted to use synthetic resin instead of rubber in order to improve the above-mentioned drawbacks. However, in general, many synthetic resins are hard and few are flexible like rubber. Therefore, it was not easy to replace rubber with synthetic resin. The inventor chose a synthetic resin that was thought to be flexible, and
Various experiments were attempted in an attempt to achieve rubber-like flexibility and elasticity. As a result, vinyl acetate/ethylene copolymer resin with a particularly high vinyl acetate content, specifically, a vinyl acetate-ethylene copolymer resin with a vinyl acetate content of 40-
It has been found that by using a 52% by weight vinyl acetate/ethylene copolymer resin, a material exhibiting flexibility and elasticity that can replace rubber can be obtained. This invention is
It was completed based on this knowledge.

(Means for Solving the Problem) As a result of further experiments, the inventor found that simply using the vinyl acetate/ethylene copolymer resin (hereinafter referred to as copolymer resin) containing a large amount of vinyl acetate, Since the flexibility was still insufficient, it was discovered that a small amount of natural rubber or a specific synthetic rubber should be added to it. In addition, this inventor
When such a copolymer resin is used, unlike when chloroprene rubber is used alone, it is difficult to age, exhibits good physical properties even without mixing carbon black, and can be colored freely. I found that it was clear. Furthermore, this inventor has determined that the blending ratio of copolymer resin and rubber is
We have found it convenient to use a proportion of 10-40 parts by weight of rubber to 90-60 parts by weight.

Furthermore, it was confirmed that the mixture of copolymer resin and rubber obtained as described above should be thoroughly kneaded and foamed in the same manner as when conventional rubber is used alone. It was confirmed that a foaming ratio of 5 to 20 times is appropriate. When foamed in this way, this composition is resistant to aging, so when the foamed material is made into a sheet, it can be used as clothing fabric by simply attaching knitted or jersey fabric to one side of the sheet for reinforcement. It has been confirmed that this fabric can be used as a clothing fabric and is lightweight and highly flexible since it does not require knitted or jersey fabric on both sides. This invention was made based on such confirmation.

This invention has a vinyl acetate content of 40-52% by weight.
A composition of 90 to 60 parts by weight of vinyl acetate/ethylene copolymer resin and 10 to 40 parts by weight of natural or synthetic rubber is foamed to 5 to 20 times the size of a closed cell foam sheet. To provide a cold-proof or waterproof clothing fabric made by laminating jersey fabrics together.

In this invention, a vinyl acetate/ethylene copolymer resin, that is, a copolymer resin is used. The copolymer resin is characterized by a higher vinyl acetate content than the vinyl acetate/ethylene copolymer resin that has been widely used up until now. That is, general copolymer resins have a vinyl acetate content of 5 to 26% by weight.
However, the copolymer resin used in this invention has a high vinyl acetate content of 40-52% by weight.

In this invention, natural or synthetic rubber is used together with the copolymer resin. Synthetic rubbers that can be used have 1-2 or 1-4 bonds, such as polybutadiene rubber, isoprene rubber, styrene-butadiene rubber, etc.

In this invention, the mixing ratio of the copolymer resin and rubber is 90-60 parts by weight for the former and 10-40 parts by weight for the latter. This ratio was determined from experiments. That is, the copolymer resin is more than 90 parts, and therefore the rubber is more than 90 parts.
If the amount is less than 10 parts, the resulting composition will have poor flexibility; conversely, if the copolymer resin is less than 60 parts and the rubber is more than 40 parts, the composition will age easily and have poor mechanical properties. This is because the strength, particularly the tear strength, deteriorates, making it impossible to obtain satisfactory results. This composition is made by not only simply mixing the copolymer resin and rubber, but also by thoroughly kneading them under heating to obtain a uniform composition.

In this invention, a foaming agent is used to foam the composition of copolymer resin and rubber. As the foaming agent, a solid compound that decomposes at a temperature equal to or higher than the softening point of the composition and foams gas is used. As the solid compound, one that is already known as a foaming agent for rubber or synthetic resin is used. For example, dinitrosopentamethylenetetramine or azodicarbonamide can be used. The amount of blowing agent is between 5 and 20 parts by weight per 100 parts by weight of the composition as described above.

In this invention, in order to facilitate foaming of the copolymer resin, a crosslinking agent is added along with a foaming agent, and an activator and a plasticizer are also added. As a crosslinking agent,
Use organic peroxides such as dicumyl peroxide. For example, diethylene glycol is used as the activator, and dioctyl phthalate is used as the plasticizer. Their amounts are based on the resin composition described above.
It is appropriate to use 0.7-1.4 parts by weight of the crosslinking agent, 0.5-2 parts by weight of the activator, and 1.5-5 parts by weight of the plasticizer per 100 parts by weight.

In this invention, fillers and colorants can be added to the resin composition as necessary. As the filler, for example, 1 to 40 parts by weight of talc, calcium carbonate, magnesium carbonate, white enamel, white carbon, etc. can be added to 100 parts by weight of the resin composition. Any color can be imparted to the coloring agent by adding any dye or pigment.

A mixture of the copolymer resin and rubber to which the various substances mentioned above have been added is first made into a uniform composition by thoroughly kneading the mixture. For this purpose, these mixtures are placed in a roll or extruder and kneaded under heat. The uniform composition thus obtained is once formed into a sheet shape. In the sheet state, the composition is still in an unfoamed state. Thereafter, the resulting sheet is placed in a press and heated to a temperature higher than the kneading temperature mentioned above to decompose the foaming agent, and then the sheet is foamed by removing the press pressure. In this way, a sheet expanded 5-20 times is obtained. Among these, a foaming ratio of 10 to 12 times is appropriate. This foam sheet is of a closed cell type and has the property of being impermeable to water and air. The reason why the foaming ratio is limited to 5 to 20 times is that foaming ratios within this range exhibit appropriate mechanical strength, lightness, and elasticity.

The foamed sheet thus obtained is then annealed. Annealing foam sheet 80
This is done by heating to -100℃ for 60-120 minutes. At this time, the foam sheet shrinks to some extent. The shrinkage should be kept below 10% in terms of volume. The annealed foam sheet is then used for clothing.
5mm thick, 6-12mm for boot lining material
sliced to a thickness of .

The sliced foam sheet is laminated with a knitted or jersey fabric on at least one side thereof to obtain a cold-proof or waterproof clothing fabric according to the present invention. Adhesive is used for bonding. As the adhesive, an adhesive made of neoprene rubber is suitable.

Knitted or jersey fabrics are generally stretchable and have sufficient mechanical strength. However, this fabric freely permeates water and air. Therefore, when the above-mentioned sliced foam sheets are pasted together, the resulting pasted material becomes impermeable to water and air, and has thermal insulation properties, since the foam sheets are of closed cell type. Become. Moreover, this bonded product has sufficient flexibility and stretchability. Therefore, it is suitable for use as a cold-proof or waterproof clothing fabric.

(Effect of the invention) The cold-proof or waterproof clothing fabric according to the present invention has a vinyl acetate content of 40-52% by weight as a resin.
Since the composition was made by mixing 90-60 parts by weight of copolymer resin with 10-40 parts by weight of natural or synthetic rubber, chloroprene rubber alone was used. Compared to the materials used, it does not age easily, has excellent mechanical strength, especially resistance to tearing, and is easy to foam. Therefore, it can be foamed to a high degree of expansion and exhibits flexibility and elasticity similar to that of rubber. Since the composition does not easily age, there is no need to coat both sides of the foam sheet when it is made into a foam sheet.
Since it is sufficient to reinforce only one side with stockinette or jersey fabric, the thickness of the bonded product can be reduced. Therefore, it can be used as a flexible clothing material. Furthermore, since it is sufficient to cover one side, the colored side of the foam sheet can be exposed, resulting in a beautiful appearance. Furthermore, since the foam sheet has good slipperiness, it is easy to put on and take off even when the foam sheet is used in direct contact with the skin. In addition, since it is easy to foam, it can be foamed to a high magnification.
Therefore, a lightweight clothing material can be obtained even when knitted or jersey fabric is bonded to both sides, and since it is sufficient to bond knitted or jersey fabric to only one side, an even lighter clothing material can be obtained. Furthermore, since the foam sheet is a closed cell type, it has no air permeability or water permeability.
Therefore, it exhibits sufficient buoyancy in water, and is cold and waterproof. Therefore, the laminated fabric according to the present invention is excellent as a cold-proof or waterproof clothing fabric, and furthermore, because it easily floats due to air bubbles, it can also be used as a fabric for life preservers.

In particular, the fabric according to the present invention can be used for diving clothing,
It is suitable for making various products such as cold protection gear for surfing, fishing or skiing, clothing for fishing floats, rain protection, cold weather gloves, life jackets, rider wear, inner wear, and lining materials for cold weather boots.

(Example) Next, an example will be described to explain the details of the fabric according to the present invention. In the following, parts simply mean parts by weight.

Example 100 parts of vinyl acetate-ethylene polymer with a vinyl acetate content of 45% by weight, 25 parts of isoprene rubber as a synthetic rubber, 11 parts of dinitrosopentamethylenetetramine as a blowing agent, and 1 part of dicumyl peroxide as a crosslinking agent. 1 part, 2 parts of diethylene glycol as an activator, 3 parts of dioctyl phthalate as a plasticizer, 3 parts of Sunaid LP (manufactured by Sanshin Kagaku Co., Ltd.) as a softener, and 5 parts of talc as a filler were mixed.

This mixture was thoroughly kneaded using a roll at 60°C, and the kneaded product was formed into a film with a thickness of 1 to 2 mm, and the films were stacked to a desired thickness to form a masticated sheet. This masticated sheet is unfoamed. This mastication sheet is placed in a press and weighs 150Kg/
After heating to 170° C. for 24 minutes under a pressure of cm ² , the pressure was released to allow foaming. In this way, the volume is approximately
The foam was expanded 10 times to obtain a foam sheet with a thickness of 35 mm.

This foam sheet was annealed at 100°C for 15 hours. Thereafter, the sheet was sliced into 1-2 mm thick pieces. The sliced sheet was adhered to a stockinette fabric on one side with a neoprene adhesive to obtain a clothing fabric according to the present invention. This fabric was particularly suitable for making diving suits.

Compared to conventional fabrics using chloroprene rubber, this fabric has greater strength, especially tear strength, and is about half the weight of fabrics with the same strength, has a smooth surface, and feels good on the skin. It was excellent as a cloth for clothing.

Claims (1)

[Claims] 1. A free-standing foam made by foaming a composition of 90-60 parts by weight of vinyl acetate/ethylene copolymer resin with a vinyl acetate content of 40-52% by weight and 10-40 parts by weight of natural or synthetic rubber to a size of 5-20 times. A cold-proof or waterproof clothing fabric made by laminating stockinette or jersey fabric on at least one side of a cellular foam sheet.