What points need to pay attention to when buying mildew protection agent
What points do you need to pay attention to when buying mildew prevention agents?
Problem one, the initial waterproof performance of anti-mildew agent is poor
1. Reasons:
Through the experiment, it is believed that there are three main reasons for the poor initial waterproof performance:
(1) Processing cloth; The scouring or dyeing cloth is not sufficiently cleaned, and the scouring agent, levelling agent, dispersant, penetrant and other auxiliary agents remain on the cloth.
(2) Working fluid problems, improper use of concentration or concentration changes during processing; Or, the working fluid is affected by mechanical stirring, temperature, and mixing agents, and its stability is affected. Then there are the reasons for the improper preparation sequence of the working fluid bath PH value.
(3) Reasons for processing conditions, inadequate selection of waterproofing agents, or inadequate drying and baking conditions, and uneven mildew proofing agents. The main countermeasures to solve the above problems can be started from the following aspects
2. Main countermeasures
(1) Before waterproof processing, the processed cloth should be fully washed.
(2) Choose the waterproof agent suitable for processing fiber, and constantly supplement the newly formulated working fluid as far as possible during processing. Strengthen the temperature management of the processing cloth, the drying temperature does not exceed 130 ° C, and avoid previous cross-linking. Avoid drying hot cloth directly into the studio. Understand the compatibility of the waterproofing agent, prepare the working liquid correctly according to the dispensing sequence, and the prepared working liquid should be used within 24h.
(3) The drying and baking temperature should be uniform, and the baking temperature should not be too low, generally above 150℃.
Problem two, the durability of waterproof agent is poor
1. Reasons:
(1) Insufficient washing of processed cloth.
(2) The processing conditions, especially the baking conditions, do not meet.
(3) Influence of crosslinking agent, resin and fixing agent.
2. Main countermeasures;
(1) The cloth dyed with direct dye or reactive dye after fixing color should be fully washed.
(2) Select the appropriate crosslinker or resin and use it within the shelf life.
(3) Choosing the appropriate waterproof agent and dosage is to ensure the durability effect.
Problem three, water proofing
1. Reasons:
⑴ Poor stability of the working fluid. This can be determined by observing the surface of the working liquid after high-speed stirring and whether there is scum on the roll.
(2) Malignant vesicles may be produced. This can be touched by hand, and if it clumps and becomes scum, it is a malignant bubble.
2. Main countermeasures:
(1) Pay attention to control the temperature of the working liquid does not exceed 35C.
(2) When malignant bubbles are found, a stabilizer (isopropyl alcohol) is added.
(3) Water repellent should be used within the shelf life.
Problem four, anti-mildew agent streaks
1. Reasons:
(1) Uneven pre-treatment and uneven dyeing.
(2) Uneven rolling pressure, resulting in uneven rolling liquid.
(3) The permeability of the working fluid is poor, and the liquid flows down, which is more common in fabrics with poor permeability such as high density and thick fabrics.
2. Main countermeasures:
(1) Ensure that the pre-treatment process and dyeing are uniform.
(2) Use uniform rolling, and pay attention to often clean the roll and groove.
(3) Choose a waterproofing agent with high permeability and a small amount of non-ionic penetrant.
