Reasons and countermeasures for poor waterproofing and oil-proofing of fabrics in the initial stage after finishing:
1.Performance of waterproof and oil-repellent agent:
Cationic water and oil repellent agents have better stability and adsorption capacity to fibers than non-ionic and anionic products. The smaller the molecular weight of the additives contained in the product, the better the film-forming properties. The molecular structure of the waterproof and oil-repellent agent determines the oil-proof performance.
2.Usage amount of waterproof and oil-repellent agent:
Under normal processing conditions, the waterproof and oil-proof effect increases as the dosage increases; however, after reaching saturation, when the dosage increases, the waterproof and oil-proof effect no longer improves, and the product performance reaches its limit.
3.Baking conditions:
Polymer waterproof and oil-repellent agents require high temperatures to cross-link and form films. Insufficient baking will affect the film-forming properties, resulting in poor waterproof and oil-repellent effects. The baking temperature is also critical. The higher the temperature, the better it is for waterproofing and oil resistance. In order to avoid yellowing and discoloration of the fabric, the temperature should be limited, but the baking time can be extended to improve the waterproof and oil-proof effect.
4.Front fabric processing:
The pre-treated fabric must be refined and clean. The residual oil and wax will affect the adsorption capacity of the fabric to the waterproof and oil-repellent agent. The pH of the fabric before finishing must not be alkaline.
5.Compounded with other additives (such as softeners, antistatic agents):
Compound softeners are often non-ionic and cationic, rather than anionic. Non-ionic softeners have less impact on the waterproof and oil-proof effect, but the hand feel is not ideal; using a small amount of cationic silicone softeners will produce a better hand feel. Non-ionic antistatic agents are often used. Although cationic antistatic agents have good antistatic effects, they will significantly reduce the waterproof and oil-proof effects after being bathed with waterproof and oil-repellent agents, so they should not be used.
6.Fabric structure:
The liquid-carrying rate of polyester high-density fabrics is often less than 30%, and the waterproof rating is <100 points under normal dosage. Increasing the dosage, adding synergists (fluorine-free waterproof synergist Texnology®XR88) or raising the setting temperature can improve the waterproofness. Oil effect. Blended fabrics such as nylon and polyester will have water marks on the surface when used alone. Adding melamine resin can improve this phenomenon. Only when the nylon fabric is above the isoelectric point and the potential displayed on the fabric is negative charge, can it better absorb the positively charged waterproof and oil-repellent agent molecules and show a better waterproof and oil-proof effect.
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