The physical properties of polypropylene

1. Form The longitudinal surface of polypropylene is straight and smooth, and the cross section is round. 2. The biggest advantage of density polypropylene is its light texture. Its density is only 0.91g/cm3, which is the lightest variety among common chemical fibers. Therefore, polypropylene of the same weight can obtain a higher coverage area than other fibers. 3. Strength and elongation Polypropylene has high strength, large elongation, high initial modulus and excellent elasticity. Therefore, polypropylene fiber has good abrasion resistance. In addition, the wet strength of polypropylene is basically equal to the dry strength, so it is an ideal material for making fishing nets and cables. 4. Light moisture absorption and dyeing properties, good warmth retention; almost no moisture absorption, but strong wicking ability, and obvious moisture absorption and perspiration effect; polypropylene fiber has low moisture absorption and almost no moisture absorption, and the moisture regain under general atmospheric conditions is close to zero . But it has a wicking effect and can transmit water vapor through the capillary in the fabric, but it does not have any absorption effect. Polypropylene fiber has poor dyeability and incomplete chromatograms, but the coloring of the original solution can be used to make up for the shortcomings. 5. Acid and alkali resistance Polypropylene fiber has good chemical resistance. In addition to concentrated nitric acid and concentrated caustic soda, polypropylene fiber has good resistance to acids and alkalis, so it is suitable for use as filter materials and packaging materials. 6. ​​Light fastness, etc. Polypropylene has poor light fastness, poor thermal stability, easy aging, and is not resistant to ironing. However, the anti-aging performance can be improved by adding an anti-aging agent during spinning. In addition, polypropylene fiber has good electrical insulation, but it is easy to generate static electricity during processing. Due to the low thermal conductivity of polypropylene, it has good warmth retention. 7. High strength Polypropylene stretch yarn is second only to nylon in strength, but the price is only 1/3 of that of nylon; the fabric is dimensionally stable, has good abrasion resistance and good chemical stability. However, it has poor thermal stability, is not resistant to sunlight, and is prone to aging and brittle damage. For this reason, anti-aging agents are often added to polypropylene.

Varieties of polypropylene

The varieties of polypropylene fibers include filaments (including undeformed filaments and bulky textured filaments), short fibers, bristles, split-membrane fibers, hollow fibers, shaped fibers, various composite fibers, and non-woven fabrics. The main purpose is to make carpets (including carpet base cloth and suede), decorative cloth, furniture cloth, various ropes, strips, fishing nets, linoleum, construction reinforcement materials, packaging materials and industrial cloths, such as filter cloth and bag cloth Wait. In addition, the application in clothing is becoming more and more extensive. It can be blended with a variety of fibers to make different types of blended fabrics. After knitting, it can be made into shirts, outerwear, sportswear, socks, etc. The quilt made of polypropylene hollow fiber is light, warm and elastic. Polypropylene is the Chinese trade name of synthetic fiber isotactic polypropylene fiber made from propylene, a by-product of petroleum refining, also known as polypropylene fiber. According to the "2013-2018 China Polypropylene Fiber Industry Competitive Pattern and Development Trend Research Report", the downstream industry of polypropylene fiber will enter a new round of business cycle in the future, which will bring about the expansion of polypropylene fiber market demand, and the sales of the polypropylene fiber industry have rebounded significantly. , The relationship between supply and demand has been improved, and the profitability of the industry has been steadily improved. At the same time, under the national "Twelfth Five-Year" plan and the general policy of industrial structure adjustment, polypropylene fiber is facing huge market investment opportunities, and the industry is expected to usher in new development opportunities.

What is jute

Upright woody herb, 1-2 meters high, glabrous. Leaves are papery, ovate-lanceolate to narrow-lanceolate, 5-12 cm long, 2-5 cm wide, apex acuminate, base round, hairless on both sides, three veins on both sides of the veins ascend but not half , The midrib has 6-7 pairs of lateral veins, with thick serrations on the edges; petioles are about 2 cm long and pilose. The flowers are solitary or arranged in axillary cymes, with short stalks and stalks; sepals are 4-5 pieces, 3-4 mm long; petals are yellow, obovate, approximately the same length as the sepals; stamens 18-22 pieces , Free; ovary glabrous, stigma lobed. The capsule is spherical, 1 cm in diameter or slightly larger, without an angle at the top, with straight blunt edges and nodules on the surface, with 5 lobes dehiscing. Flowering in summer, the fruit matures after autumn. An annual upright woody herb, 1～4m high, and the whole plant is glabrous. The leaves are papery, ovate-lanceolate to narrow-lanceolate, 5-12cm long, 2-5cm wide, apex acuminate, base round, 3 veins on both sides of the veins are ascending but half, the central vein has lateral veins 6～ Seven pairs, with thick serrations on the edges, and 1 tooth elongated near the base to form a diamond shape; petioles are about 2cm long and pilose; stipules are linear and shed. Cymes are axillary, with several flowers, small, yellow; sepals are light purple, about 4mm in length; petals are obovate, nearly as long as sepals; stamens are numerous; ovary is glabrous. The capsule is spherical, about 1 cm in diameter, with longitudinal ribs and verrucous protrusions, and the top is truncated or depressed, and it is 5-valved at maturity. Flowering period from July to August, fruiting period from September to October.

What's the use of jute thread?

Jute thread means twine or hemp rope, because the natural color of the thread is yellow. In the past, jute bags were stronger and used to hold grains. Jute (Latin scientific name Corchorus capsularis L), belongs to the genus of Tiliaceae jute, bast fiber crop, annual herb, likes warm and humid climate, short-day crop, alias hemp, green hemp, hemp, water hemp, wild Kenaf, round fruit jute, round boll jute, kusane leaf, cownix, three bead grass, sky perilla, hemp bones, etc., is a long, soft, shiny plant fiber that can be woven into high strength Of rough filaments. Jute fiber is one of the cheapest natural fibers. It is second only to cotton in terms of planting amount and wide range of uses. It has the characteristics of good moisture absorption and fast moisture loss. It is mainly used for textile sacks and burlap. The color of the fiber ranges from white to brown, and it is 1–4 meters long. It is native to tropical Asia and is widely cultivated south of the Yangtze River in China.