Pure cotton fabric, soft touch, good hygroscopicity, comfortable and comfortable to wear. Favored by the market. In order to change the shortcomings of cotton fabrics that are easy to wrinkle and wear during washing, the fabrics are often treated with no-iron resin.
Resin finishing agents are available in formaldehyde-free and formaldehyde-containing resins. The formaldehyde-free resin is green and environmentally friendly, but the processed fabric has low resilience and cannot meet the requirements of shrink-proof and wrinkle-proof of pure cotton fabric. Formaldehyde-containing resins are mostly N-methylolamide modified resins.
After no-iron finishing of formaldehyde-containing resins, the harm of formaldehyde released on fabrics to consumers and the environment has attracted attention from all walks of life. Countries around the world have formulated a series of strict standards for the amount of formaldehyde released on clothing and decorative textiles. Such as: China's GBl8401-2001 stipulates the formaldehyde limit: 20 for baby clothing
ppm, 75 ppm for clothing that directly contacts the skin; 300 ppm for clothing that does not directly contact the skin; Japan regulates the formaldehyde limit: 75 ppm for clothing that directly contacts the skin; 300 ppm for shirts and pajamas for men and women with less direct skin contact. At present, the non-iron finishing of cotton fabrics mostly uses low-formaldehyde finishing agents.
According to the processing process, there are six types of anti-wrinkle or no-iron finishing of pure cotton fabrics: pre-baking and drying cross-linking, post-baking and drying cross-linking, moisture cross-linking, wet short steaming, ready-to-wear ironing and vapor cross-linking (VP finishing) Craftsmanship.
The tide cross-linking process is commonly used to produce thin fabrics such as high-end shirts and bed sheets. The fabric is padded with resin solution, dried to a specific moisture content, and then stacked and reacted at a temperature of 20-30 ° C. Moisture cross-linking reacts at low temperature, which can make the finished fabric achieve a very good anti-wrinkle and no-iron effect, with good resilience and flatness, and strong damage is also small. However, due to the use of strong acids as catalysts, the choice of dyes is limited, and the process time is very long, the process parameters are difficult to accurately control, it is easy to cause quality deviations, and the production efficiency is not high.
The wet short steaming process, the strength retention rate, flatness and washing resistance of the fabric after finishing are obviously better than the conventional baking and finishing process. Wet short steaming process, temperature 130 ℃, humidity 37 ± 2%, time 3 minutes, strict requirements, steaming should be soaped and washed. Restricted by equipment, it has not been widely promoted.
Gas-phase cross-linking has extremely strict requirements on equipment and environmental protection, and the process conditions are difficult to control. Currently, only Nisshinbo and Youngor are in use.
Non-ironing of ready-to-wear, mostly refers to making garments impregnated with resin finishing liquid in a garment factory or a washing factory, and then setting and baking. It is different from the post-baking process of fabric.
The pre-baking and drying cross-linking process is what we usually call ironing and finishing. The fabric prepared by this method is dry and wrinkle-proof, has good resilience and flatness, and can obtain a general appearance and a general no-iron effect, but it can not obtain permanent folds and creases, and has strong damage. Poor wet and wrinkle resistance, creases will still occur after washing; feels harder. Due to low equipment requirements, simple processing methods, and high production efficiency, it is conducive to continuous production; it is the most commonly used production process in ironing and finishing for printing and dyeing enterprises.
Physical and chemical index of super soft instant film:
Composition: Fatty acid imidazoline compound
Appearance: light yellow flakes
PH value: 4.5-6.5 (6-10% slurry)
Ionicity: cation
Chemical method:
Cold compounding: Add 6-10% of the soft film gradually to the water at about 30 ℃ under stirring, stir for 3-5min to disperse it, let it stand for 2-4h, and then stir at low speed until it becomes a uniform slurry.
Warm method: Add 6-10% of the film to the room temperature water under stirring, stir for 3-5min, then gradually heat to 60-70 ℃, continue to stir at low speed until it becomes a uniform slurry, cool and reserve.
Use process:
Padding type: 2-3g / L, temperature 30-40 ℃, two dip two rolling or one dip one rolling.
Immersion type: 0.3-0.8% (o.w.f), bath ratio 1: 10-15, temperature 40-50 ℃, 15-30min.
Application characteristics:
It is suitable for the softness of needles, shuttles, polyester / cotton fabrics, and can give the clothes a soft and smooth effect when washed.
Can be used for yarn lubrication, sanding, and fluffing to make fluffing smooth.
