Common problems and countermeasures in waterproof and oil-proof finishing
Water- and oil-repellent finishing has been developing more and more rapidly in recent years. Organofluorine resin is a water-repellent and oil-proof finishing agent with excellent performance. It is widely used in work clothes, high-end interior decorations, shoes and socks, bed sheets, luggage, etc. due to its high effectiveness, resistance to deterioration, and ease of use. products. However, many printing and dyeing manufacturers often encounter some problems when using organic fluorine finishing agents, such as poor initial water repellency, poor durability, water stains and streaks, large color changes, etc. In response to the above problems, through many experiments, we found the causes of the problems and put forward the main countermeasures to solve the problems.
Problem 1. Poor initial water-repellent performance
1. Reason:
Through experiments, it is believed that there are only three main reasons for poor initial water-repellent performance:
First, finishing cloth ; The scouring or coloring cloth is not cleaned sufficiently, and scouring agent, leveling agent, dispersant, penetrating agent and other additives remain on the cloth.
Second, the working fluid problem is that the concentration is improperly used or the concentration changes during finishing; or the working fluid is affected by mechanical stirring, temperature, mixing chemicals, etc., and its stability is affected. Then there is the improper preparation sequence of working fluid.
Third, due to the finishing conditions, the water blocking agent is not properly selected, or the drying and baking conditions are insufficient and uneven. The main countermeasures to solve the above problems can start from the following aspects.
2. Main countermeasures
2.1 Before water-blocking finishing, the finishing cloth should be fully washed.
2.2 Choose a water-blocking agent suitable for finishing fibers. Newly prepared working fluid may be continuously added during finishing. Strengthen the temperature control of the finishing cloth to prevent the hot cloth from entering the studio directly after drying. Understand the compatibility of the blended chemicals and prepare the working fluid according to the mixing sequence. When other additives are diluted with warm water, they need to be cooled before adding the AG series water blocking agent. The prepared working fluid must be used within 24 hours.
2.3 The drying and baking temperatures should be uniform, and the baking temperature should not be too low, generally above 140°C.
Problem 2. Poor durability of water blocking agent
1. Reasons:
1.1 The finishing cloth is not washed enough.
1.2 The finishing conditions, especially the baking conditions, are not met.
1.3 The influence of cross-linking agent, resin and color-fixing agent.
2. Main countermeasures;
2.1 Cloths colored with direct dyes or reactive dyes and then fixed must be washed thoroughly.
2.2 Select the appropriate cross-linking agent or resin and use it within the shelf life.
Problem 3. Water repellent stains
1. Reasons:
1.1 The working fluid has poor stability. This can be determined by observing the surface of the working fluid after high-speed stirring to see if there is scum on the roll.
1.2 Malignant bubbles may occur. This can be touched by hand. If it agglomerates and turns into scum, it is a malignant bubble.
2. Main countermeasures:
2.1 Pay attention to the temperature of the working fluid not exceeding 35C.
2.2 When malignant bubbles are found, add stabilizer (isopropyl alcohol).
Problem 4. Water blocking streaks
1. Reasons:
1.1 Uneven coloring.
1.2 The uneven rolling pressure causes uneven rolling fluid.
1.3 The permeability of the working fluid is poor and the liquid flows down. This phenomenon is more common in fabrics with poor permeability such as high density.
2. Main countermeasures:
2.1 Ensure uniform coloring.
2.2 Use a uniform rolling car, and pay attention to cleaning the rolls and rolling grooves frequently.
2.3 Choose water-blocking agents with high permeability and combined penetrants.
Question 5. There is a big change in the color finish
1. Reason:
The main reason for the color change is the deepening effect of fluorine-containing resin. This is also a phenomenon that cannot be completely avoided during the water blocking finishing process.
2. Main countermeasures:
To solve the color change, you can confirm the degree of color change through preliminary tests, and then carry out color matching; after finishing, you can replenish the newly prepared working fluid in time (with automatic liquid adding device) Better) to prevent head and tail color differences.
The above are the problems that often occur during water- and oil-repellent finishing. We selected a variety of water-repellent and oil-repellent finishing agents for testing, and found that by adopting the above measures and selecting excellent water-repellent and oil-repellent finishing agents (such as Japan’s Meisei series water-repellent agents), the above problems were basically solved and the water-repellent and oil-repellent finishing agent was improved. Oil effect, high customer satisfaction rate for water-repellent orders. In short, choosing a suitable water- and oil-repellent finishing agent will provide a good foundation for the water- and oil-repellent finishing of fabrics; during the finishing process, the finishing cloth, working fluid, and finishing conditions are necessary to obtain good water- and oil-repellent effects. guarantee.
AAASDGGERY6UFGH
Extendedreading:https://www.yingjietex.com/product/Imitate-Hemp-In-Disorder-Dobby-Polyester-OXFORD-Fabric.html
