1. Block copolyetherester type easy stain remover and finishing process
Block copolyetherester type easy stain remover (referred to as polyether ester) is an early durable stain remover for polyester. Its trade name is Permalose T. It is produced by the British ICI Company. It can make polyester and its blended fabrics It has excellent properties of easy decontamination, resistance to moisture re-contamination and antistatic properties. Polyether ester easy detergents have a similar structure to polyester. During the heat treatment process during finishing, they form co-crystals or co-solvents with polyester and have good wash resistance. Polyetherester is formed by the condensation polymerization of ethylene terephthalate and polyoxyethylene.
The easy decontamination performance of polyetherester is due to the fact that the block copolymer is evenly distributed on the surface of hydrophobic polyester, and the oxygen atoms in the polyoxyethylene groups can form hydrogen bonds with water molecules, making the polyester hydrophilic. The application process of polyetherester easy stain remover is mainly emulsion padding method, and the weight gain of polyester-cotton blended fabrics is 1% to 3%.
Process flow: padding (padding rate 70%) → drying (120~130℃) → heat treatment (190℃×30s) → flat washing and drying. If the easy-to-decontaminate finishing agent is mixed with resin DMDHEU, PU, etc., using magnesium chloride as a catalyst, it can obtain two functions: durable pressing and easy decontamination.
2. Polyacrylic acid type easy stain remover and finishing process
Polyacrylic acid-based easy detergents are generally copolymer emulsions, which have good low-temperature film-forming properties. Changing the composition of the copolymer can adjust the softness and hardness of the film, and have good adhesion to fibers. Polyacrylic acid type easy stain remover is composed of vinyl monomers with hydrophilic groups (such as acrylic acid, methacrylic acid, etc.) and vinyl monomers with hydrophobic groups (such as ethyl acrylate, etc.).
Research has found that acrylic acid (or a mixture of acrylic acid and methacrylic acid)/ethyl acrylate copolymer has ideal stain removal properties. The content of carboxyl groups in polyacrylic acid-based easy-to-use stain removers is very important, and must be at least 20% (volume ratio). Adding vinyl monomers with reactive groups (such as N-hydroxymethylacrylamide) to polyacrylic acid-type easy-to-decontaminate agents can improve the durability of the easy-to-decontaminate finishing effect. Polyacrylic acid-type easy-to-remove agents have good easy-to-remove properties, but they may stain more easily when worn than those without easy-to-remove finishing. Therefore, it is necessary to ensure that the film formed has a certain rigidity and swelling rate.
The easy decontamination finishing process of polyacrylic acid type easy decontamination agent is as follows: two dips and two rollings → drying (tentering) → baking (155~165℃, 3~5 min) → flat washing → drying → mechanical softening treatment . Padding fluid composition: 3% to 5% polyacrylic acid type easy-to-decontaminate agent, appropriate amount of anti-gelling agent.
The easy decontamination performance of polyacrylic acid type detergent is closely related to its structure. The easy decontamination performance is the result of the joint action of its hydrophilicity, electrostatic charge, swelling property and surface activity.
After finishing, the uneven areas on the fiber surface that are easy to bury granular dirt are wrapped and filled by the hydrophilic copolymer film to prevent “micro-adsorption”. It is also effective for hydrophobic synthetic fibers with smooth surfaces. In addition, the spaces between the yarns will also be filled with hydrophilic copolymers, thus preventing “giant adsorption”. The polyacrylic acid-type easy-to-remove agent is anionic in the lotion, which increases the electromotive force on the fabric surface. The dirt in the lotion is also negatively charged, and the surface of the polymer film generates a repulsive force against the dirt. In addition, the potential difference at the oil-water interface also reduces the interfacial tension of oil in water, making it easy for oily dirt to roll into beads and leave. Polyacrylic acid type easy stain remover has a hydrophilic group and has a low affinity for oily stains. During washing, the contact angle of oily stains on the fabric surface is larger than that of unfinished samples, and it is easy to follow Adam’s “beading” mechanism. Remove from fibers. Polyacrylic acid type easy detergent has both hydrophilicity and certain lipophilicity, and can play a cleaning role. The excellent stain-removing performance of polyacrylic acid-type easy-to-detergent is related to its violent swelling in the lotion. The swelling is caused by the mutual repulsion between negatively charged carboxyl groups. This repulsive force causes the curled and easy-to-remove copolymer molecular chains to stretch and elongate, increasing the volume of the film and generating mechanical force to expel the oil and dirt attached to it.
Hydrophilicity is the main feature of polyacrylic acid-type stain-repellent copolymer. Hydrophilicity changes the interfacial tension between fiber/oil stain and fiber/lotion, which is conducive to the departure of oil stains in a “rolling bead” manner. Among them, the interface Tension and water play a major role in diffusion at the fiber/oil interface.
For oil-stained hydrophobic fibers such as polyester fabrics, the diffusion of water or washing liquid is slow and incomplete. The effect of water is only on the edge of the oil film. It is very difficult for oil to automatically detach from hydrophobic fibers. The surface hydrophilicity of fibers treated with polyacrylic acid-type stain-repellent copolymer is increased, and the capillary pores are reduced at the same time, preventing the diffusion of oil stains into the interior of the yarn and the capillary pores. During washing, the hydrophilic copolymer greatly accelerates the diffusion of water into the interior of the fabric and yarn, so that the interface between the oil stain on the fiber surface and the easy-to-decontaminate copolymer film will be separated due to hydration, and the water can penetrate into the easy-to-decontaminate copolymer. The entire film is used to remove oil stains.
Extended reading: https://www.yingjietex.com /product/750D-Polyester-Straw-Mat-Dobby-OXFORD-Fabric.html
Extended reading: https://www.china-fire-retardant.com /post/9571.html
Extended reading: https: //www.yingjietex.com/product/Two-way-stretch-satin-Printing-fabric.html
Extended reading:https://www.alltextile.cn/product/product-37-169.html
Extended reading:https://www.china-fire-retardant.com/post/9398.html
Extended reading:https://www.china-fire-retardant.com/post/9377.html
Extended reading:https://www.brandfabric.net/elastic-knitted-fabric-4mm -sponge-elastic-knitted-composite-fabric/
Extended reading:https://www.yingjietex.com/product/Semi-dull-Nylon-taffeta-Fabric.html
Extended reading: https://www.brandfabric.net/ottoman-pongee-coated-breathable-fabric/
Extended reading:https://www.yingjietex.com/product/Ottoman-Pongee-coated-breathable-Fabric.htm
