KR20020042770A - The leather composed by polymer binder - Google Patents

Abstract

PURPOSE: Natural leather recombined by a high molecular binder is provided to minimize the damage caused by harmful materials generated during the manufacture of natural or synthetic leather, to achieve various kinds of leather, and to improve the durability of the leather. CONSTITUTION: In the leather used to manufacture shoes, clothes, furniture and so on, a leather sheet product is made by chemically combining natural leather powder with a high molecular binder. The high molecular binder consists of rubber composition, plastic composition, and urethane composition, which these compositions are able to be used individually or in a mixed condition. In order to increase the strength of the leather, a reinforcing material of natural or synthetic fiber and natural leather itself are attached to the bottom of the leather sheet product.

Description

Natural leather recombined by a polymer binder

The present invention feels the touch of natural leather among the human's favorite touch in leather products used in shoes, clothing and furniture, and durability is developed by the month especially improved products than the existing natural leather to overcome the disadvantages of natural leather and synthetic leather It is to overcome and realize the merits

The history of leather was a long time with the birth of mankind and with the history of the earth. One of the most used materials in human life is leather. However, as shown in the paintings of ancient Egyptian stones around 1550 BC, the skins of animals are peeled, the containers are washed with water, and leather The splitting work to adjust the thickness of the leather, softening the leather to give it flexibility, and finally making the finished leather show no difference from the present tanning process.

The manufacturing process of leather is raw hide (Raw Hide) → Liming → Fleshing → Sorting → Deliming → Bating → Pickling → Tanning → Sorting (Sorting) → Dyeing → Fatliquoring → Drying → Milling → Toggling → Finishing → (Base coat → Medium coat → Top coat) This is common.

Modern leather manufacturing methods are not only more scientific and systematic physical and chemical processes but also multi-stage processes such as biological processes, which are largely composed of wet processes requiring dry water and dry processes in dry conditions. It is done separately.

First, the salt solution is dissolved in a container based on the principle of a continuously circulating watermill called Raceway, and the raw material blood is poured one by one. This is caused by the infiltration of bacteria or mold in the raw material blood after slaughter or during transportation. It is salt curing to prevent it. Then, the raw materials in the paddle or drum are put into water to remove the unnecessary ingredients, and the dehydration pelt is produced by performing a washing process and an unhairing process, a Liming & Reliming process.

The hair loss treated bark is divided into a grain layer and a split layer by a band knife splitting treatment at a thickness required to produce high-quality leather and low-grade leather. It is then put into a drum and subjected to a deliming process to remove the lime components contained in the bark by applying nitrogen- or non-nitrogen-based deliming agents in a prescribed hot water.

The dehydrated napis are subsequently subjected to a bioprocessing process to remove unnecessary ingredients using proteolytic enzymes and then dissociated by adding salt so that it is not sensitive to acidity after washing. After protecting the napi tissue, a pickling process is performed to reduce acidity in the drum by adding acid with sulfuric acid, formic acid, and the like.

Next, tanning process using chromium is made of wet blue having mineral properties by applying metallic coordination compound such as chromium in animal nape state. With chromed blue leather, neutralization, retanning, dyeing and fatliquoring processes are the first step.

Dyed crust is subjected to drying process by hot air at 80 ~ 90 ℃ for perfect chemical bonding between leather and fiber protein during hand work, and then gives proper humidity control and flexibility. In order to achieve this, a milling / staking process is performed. To maintain the smoothness of the leather fabric, it is subjected to a toggling process, which is pulled by a forceps around the fabric.

After that, the drying process is finished by spraying, padding and roll coating through the various coating methods. Natural leather (Genuine leather), which is the final desired product, is made. .

However, these processes include processes that can harm the human body, and these processes are currently used by many environmental organizations in various countries around the world and by international organizations such as the World Organization (UN) and the Organization for Economic Cooperation (OECD). Environmental regulations are being tightened day by day, not only forcing developing countries to participate in the Green Round, but also for regulatory purposes, from raw materials to production processes, distribution, consumption, disposal and recovery, as well as final products. It is no exaggeration to say that R & D, production, sales and exports of products that do not consider the environment by expanding throughout business activities will be completely eliminated internationally.

In order to manufacture raw leather into usable leather, a lot of chemicals are put into it, and many environmental hazards such as waste generation during the manufacturing process are generated, and in particular, urethane coating used for leather surface treatment to increase the value of leather or Environmentally hazardous situations such as DMF or hazardous solvents are often used in the coating process using sprays.

Also, in general, natural leather cannot satisfy the durability of the material desired by consumers alone, so users can not feel the texture of natural leather by coating urethane sheets and other polymer materials on the surface of natural leather. Also recognized as. In order to coat other materials on the leather surface, adhesives should be used, and these adhesives are mostly composed of harmful substances or harmful elements, and harmful gases are scattered into the air during the work process, which is harmful to human body. At present, many engineers are working to solve this problem.

The present invention minimizes the human damage caused by the harmful substances produced when manufacturing natural leather or synthetic leather in a product composed of leather used for shoes, clothing and furniture, and also the texture and texture of natural leather and the processing of synthetic leather. The natural leather is powdered to maintain freedom and high durability, and then the powdered natural leather is formed into a polymer compound such as rubber, and the polymer is processed into a molecular ring to form a new leather concept. By minimizing the harmfulness to the human body during manufacturing, it is possible to express a variety of livestock with the freedom of processing, has a feeling of natural leather when a person uses it, and gives sufficient durability to the dangerous elements generated when using it to perform its function smoothly. High value-added new leather concept It is to manufacture.

The present invention physically decomposes the natural leather in the leather products used in shoes, clothing, furniture, etc. and then made the powder state by chemically recombining the natural leather powder by a binder which is a polymer compound that can connect the natural leather. It is characterized by the development of a new material that is characterized by its affinity with the human body and the durability of the polymer compound to enable the leather material to be used in human life in an environmentally friendly manner.

The theory of the present invention is as follows.

In leather products used for shoes, clothing, furniture, etc., natural leather is physically decomposed into powder state, and then binder is formed by high molecular compound to chemically recombine natural leather powder, salted to remove moisture Natural leather without leather surface, tanned leather skin, urethane coating, or other surface treatment is put into a roll that exerts a grinder or shearing force and is broken down into small particles to make natural leather powder. Resin-based polymer compounds, etc.) and other additives are well mixed and dispersed in a natural leather powder and a mixer, and then the temperature and pressure are controlled under the reaction conditions applicable to the polymer to chemically bond the molecules of the polymer compound to each other. New leather material as a new material by fixing It is.

The material has the properties of natural leather and synthetic leather at the same time to strictly express the natural leather powder by using a high molecular compound to bind the link again to be used as a leather product. Moisture absorption and human-friendliness show the characteristics of natural leather, and it shows the characteristics of polymer compound with excellent physical properties in durability, modulus of elasticity, and sheet expressability. When using polymers such as rubber, rubber latex, liquid rubber, urethane resin, Ethylene Vinyl Acetate, and Styrene Butadiene Styrene as binders, environmentally harmful elements and substances harmful to the human body, environmental pollution generated during processing and workers It can virtually eliminate the harmful factors to the health of the human body. At this time, natural leather can be added from 1% to 300% compared to the polymer compound and up to 500% depending on the required physical properties. Depending on the amount of polymer can be used to adjust.

As described above, in terms of the human body feel of the polymer compound produced as a binder, the durability of using the feeling of natural leather is characterized in that the ease of manufacturing the durability of the polymer material has the advantages of synthetic leather.

In addition, leather sheet products can be made by adhering a reinforcing material to the lower part of the natural leather binder. The reinforcing material is composed of natural fiber and synthetic fiber such as polyester, polyamide, polyethylene, polypropylene, polyacrylic, polyurethane, rayon, etc., and it is woven into knitted fabric, twill fabric, teaching fabric, nonwoven fabric, etc. Use the form. By adhering such reinforcing materials, high strength natural leather products can be obtained.

As can be seen from the above description, among leather products used in shoes, clothing, and furniture, one of human's favorite touches is the feel of natural leather and the like. The composed natural leather is clearly different from the existing leather products or synthetic leather and shows excellent performance as follows.

First, you can feel the excellent grip, touch, and touch of natural leather that you can't feel in synthetic leather, so it is friendly to human body and can apply the texture and advantages of natural leather as it is.

Second, it has a very high durability compared to general natural leather.

Third, it does not use harmful substances used to process natural leather, so it is environmentally friendly and it is harmless to human body when working.

Fourth, it is possible to recycle the scrap portion generated during leather processing, high recycling of resources.

Fifth, various colors and patterns are possible, so new designs can be applied.

Sixth, it costs less than natural leather.

Seventh, it is possible to give the behavioral characteristics of the material to the appearance change such as elasticity and creep, which is not seen in the existing leather.

Claims (8)

Leather products used in footwear, clothing and furniture, leather sheet products characterized in that the natural leather powder is made by chemical bonding with a polymer binder The leather sheet product according to claim 1, wherein the polymer binder is composed of a rubber composition, a plastic composition, and a urethane resin composition. The leather sheet product according to claim 1, wherein the polymer binder is made of a rubber composition, a plastic composition, or a uretan resin composition alone or in a mixture. The leather seat product according to claim 1, which is made by adding 1% to 300% of natural leather powder compared to the rubber composition. The leather seat product according to claim 1, wherein 1% to 300% of natural leather powder is added to the composition of Ethylene Vinyl Acetate. The leather seat product according to claim 1, which is made by adding 1% to 300% of natural leather powder compared to Styrene Butadiene Styrene. The leather seat product according to claim 1, wherein natural leather powder is added by 1% to 300% of the urethane resin-based polymer composition. The leather sheet product of claim 1, wherein a reinforcing material woven in the form of a knitted fabric, a twill fabric, a woven fabric, and a nonwoven fabric of natural and synthetic fibers is formed on the lower portion of the leather sheet product to make a high strength product.