Water resistant natural cork fabric adhesive cork fabrics for women shoes and bags

The softwood cork tree (called cork oak abroad) is difficult to adapt to high cold and high temperature climates. It generally grows in mountain forests at an altitude of 400-2000 meters in subtropical and temperate climate zones. Within the range of 32 to 35 degrees north latitude, cork resources can be found in most mountainous areas that meet the geographical and climatic conditions. For example, Portugal, Spain, the southern region of France, as well as the Qinba Mountains in my country, southwestern Henan, Algeria, etc.
Portugal ranks first in the world in cork exports and is known as the "Kingdom of Cork" because of its special Mediterranean climate, which is suitable for the growth of cork raw materials. At the same time, Portugal is the earliest in the world in the development of cork resources, export of raw materials, and deep processing of products. one of the countries. Algeria's softwood production ranks among the top in the world.
The Qinba Mountains in Shaanxi, my country, are also rich in cork resources, accounting for more than 50% of the country's cork resources. Therefore, Shaanxi is known as the "Cork Capital" in the industry. Relying on this resource advantage, large domestic cork manufacturers are mainly concentrated here.
Cork is composed of many flat cells arranged radially. The cell cavity often contains resin and tannin compounds, and the cells are filled with air. Therefore, cork is often colored, light and soft, elastic, impermeable, not susceptible to the effects of chemicals, and is a poor conductor of electricity, heat and sound. It is composed of 14-sided dead cells arranged radially from each other in a hexagonal prism pattern. Typical cell diameter is 30 microns and cell thickness is 1 to 2 microns. There are ducts between cells. The space between two adjacent cells is composed of 5 layers, two of which are fibrous, followed by two suberized layers, and a woody layer in the middle. There are more than 50 million cells per 1 cubic centimeter. .
characteristic
This structure makes the cork skin have very good elasticity, sealing, heat insulation, sound insulation, electrical insulation and friction resistance. In addition, it is non-toxic, odorless, small in specific gravity, soft to the touch, and not easy to catch fire. It still has no Man-made products are comparable. In terms of chemical properties, the ester mixture formed by several hydroxy fatty acids and phenolic acids is a characteristic component of cork, collectively called suberin.
This type of material is resistant to corrosion and chemical attack. Therefore, in addition to being corrosive to concentrated nitric acid, concentrated sulfuric acid, chlorine, iodine, etc., it has no chemical effect on water, grease, gasoline, organic acids, salts, esters, etc. It has a wide range of uses, such as bottle stoppers, insulation layers of refrigeration equipment, lifebuoys, sound insulation panels, etc.
Products
①Natural cork products. After cooking, softening and drying, it is directly cut, stamped, turned and other methods to make finished products such as plugs, pads, handicrafts, etc.
② Baked cork products. The leftover materials of natural cork products are crushed and compressed into shapes, baked in an oven at 260 to 316°C for 1 to 1.5 hours, and then cooled into cork bricks for low-temperature insulation. It can also be manufactured by superheated steam heating method.
③Cemented cork products. Cork fine particles are mixed with powder and adhesives (such as resin, rubber) and pressed into cemented cork products, such as floor veneers, sound insulation boards, heat insulation boards, etc., which are widely used in aerospace, ships, machinery, construction, etc.
④Cork rubber products. It is made of cork powder as raw material and about 70% rubber content. It has the compressibility of cork and the elasticity of rubber. It is mainly used as high-quality low and medium-pressure static sealing materials for engines, etc., and can also be used as anti-seismic, sound insulation, friction materials, etc.