Home >

Microfiber Synthetic Leather Makes Up For The Shortage Of Natural Leather.

2010/9/11 11:15:00 77

??? 日本語 Fran?ais English 中文

Microfiber Synthetic Leather Natural Leather

September 11th, due to natural conditions, cosmopolitan.

Natural leather

There will not be a lot of growth.

Superfine fiber

Synthetic leather can not only supplement the shortage of natural leather in quantity, but also has been applied in more and more fields because of its many properties superior to natural leather.

The application of natural leather processing technology to the production of microfiber synthetic leather is favored by experts and has a bright future.

Because of microfiber synthetic leather and

Genuine leather

There is a certain gap between the properties of the handle, that is, the ultra-fine fiber synthetic leather has the problem of low moisture permeability. Therefore, people have never stopped exploring the leather method of synthetic leather.

The reason why leather has always been popular is that leather has superior moisture absorption and dehumidification function, which can reduce the peculiar smell produced in shoes and improve the micro climate in shoes, so that it has the comfort of wearing and meets the health requirements of the human body.

Comfort (hydrophilicity, sweat absorption, elasticity, breathability, moisture permeability, warmth retention) is the most basic requirement of middle and high grade shoes. Therefore, as shoe material, it must have certain hygroscopicity to ensure that sweat is evenly distributed in the process of wearing.

Hygroscopicity is a basic indicator of fiber properties.

Most of the synthetic fibers lack or do not have enough hygroscopic affinity, so the hygroscopicity is poor.

The moisture absorbency of microfiber synthetic leather is the best in synthetic leather. According to the data, the permeable steam of natural leather is about 800mg/ (10cm2 24h), and the moisture permeability of superfine fiber cloth is about 400mg/ (10cm2 24h). This is mainly due to the hydrophilic group of collagen fiber in natural leather is more than that of superfine fiber, and the speed of natural leather pmission to water vapor is much faster than that of ultrafine fiber.

Compared with the natural leather, the superfine fiber base cloth has smaller density of woven fabric and loosely woven base cloth, resulting in its thin handle.

According to the analysis of histological sections, the single fiber of the superfine fiber base is straight columnar, and forms a net like structure through the intersecting of branches, while the single fiber of natural leather is curved and linear, forming a net solid structure through mutual division.

Therefore, compared with the leather made from natural leather, the superfine fiber base cloth has a large modulus of elasticity and is not easy to embossing.

This research is aimed at improving the water vapor permeability and improving the handle and embossing formability of microfiber synthetic leather.

1 microfiber synthetic leather processing technology

The process mainly includes 2 parts: one is wet processing, the other two is dry finishing.

The basic principle of the process is that the main component of superfine fiber is polyamide fiber. According to the data, the composition and structure of the polyamide fiber are simpler than that of the protein fiber. Only the carboxyl group and amino group exist at the end of the molecular chain. There are a large number of carbon chains and amide groups in the middle of the molecular chain, and no side chain.

The amino content of polyamide fiber is low, and the amino content of nylon 66 and nylon 6 are 0.04mol/kg (fiber) and 0.098mol/kg (fiber), respectively, 1/20 and 1/10 for wool.

The content of carboxyl group of polyamide fiber is higher than that of amino group. At isoelectric point, all amino groups exist in the form of -NH3+ ions, while carboxyl groups exist only in the form of -COOH- ions.

In view of the structure of polyamide fiber, acid hydrolysis and enzymatic hydrolysis technology are used to chemically modify superfine fibers, open their amide bonds and increase their active groups. Then, the retanning, filling, fatliquoring and dyeing technology of natural leather are used to fill the superfine fiber tanning agent between superfine fibers, improve its water vapor permeability and other physical properties, and make the microfiber cloth close to the leather leather.

The basic principle of dry finishing is aimed at different uses of finished products. The technology of natural leather finishing combined with synthetic leather making technology is adopted. The process of sealing, pressing, fine-grained - grit - making - press fine stripe - Top - embossing - soft - throwing is applied to form the superfine fiber sand leather with the appearance of leather.

The wet coating is used to form the next layer, giving the superfine fiber base cloth the surface of the leather like leather. On the basis of this, various kinds of genuine leather finishing technology, such as roll coating, spraying, embossing, printing, film sticking and so on, can be made into a variety of genuine leather appearance and handle.

fashion

Products.