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厦门瑞克曼化工科技有限公司

Xiamen Rickman Chemical Technology Co., Ltd.
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Keywords: Alcohol defoamer

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Classification of common softeners and common quality problems

Source:rickmanchem2020-12-1724

Softener is a kind of chemical substance that can change the static and dynamic friction coefficient of fiber. When we change the coefficient of static friction, feel smooth, it’s easy to move on the fiber or fabric. When the coefficient of dynamic friction is changed, the microstructure between the fibers tends to move with each other, that is, the fibers or fabrics tend to deform. According to the ionic classification , softener has four types: cation, non-ionic, anion, and amphoteric ionic.

 

Types of softener:

1 silicone,  2film,  3 D1821,  4EQDMS, 5 anion

 

Common problems:

1 Feel not as good as it should be. The soft finishing style is varied according to customer requirements, such as soft, smooth, fluffy, soft and waxy, slippery, dry and slippery. Also softeners are depended on different styles. For example, in the film, there are different structures of softener film, its softness, elasticity, smoothness, yellowing, which  affects the water absorption of the fabric. In silicone oil, the modified properties of different modified genes are also different, such as amino silicone oil, hydroxyl silicone oil, epoxy-modified silicone oil, carboxyl modified silicone oil and so on.

2 Become yellowing

The amino group yellowing of  a certain structure of film and amino silicone oil is the main factor. In the film, cationic film is soft, feeling good, and easy to adsorb on the fabric, but easy to be yellowing, which affect hydrophilicity. If the cationic film is changed into soft oil essence, its yellowing will be greatly reduced, hydrophilicity has also been improved.  If the cationic film and hydrophilic silicone oil composite, or hydrophilic finishing agent composite, its hydrophilicity will be improved. Anion film or non - ionic film is not easy to yellowing, some films are not yellowing,and do not affect hydrophilicity. Amino silicone oil is the most widely used , but because the amino will cause discoloration and yellowing,that the higher the ammonia value, the greater the yellowing, it should be changed to low yellowing amino silicone oil, polyether modification, epoxy modification and other non-yellowing silicone oil.

3 Decreased hydrophilicity of the fabric

Generally, the structural problems of the film and the lack of water absorption gene after silicone oil film formation are the main reasons and  the closure of cellulose fiber hydroxyl, wool carboxyl, amino, and other water absorption centers result in decreased water absorption. Hence, anion, non - ion film and hydrophilic silicone oil should be selected as far as possible

4 Deep brown spots

The main reason is that the stain is not cleaned before treatment and the stain is darker when dyeing ,or too much foam in dyeing bath, foam and floral sweater, dye and other mixture on the fabric; Or defoaming agent flicks oil to cause dark oily spot; Or tarry matter in a dye VAT; Or dyes in different cases agglutinate into dark spot; Or the water quality calcium magnesium ion too much and dye bond to stick to the fabric; Hence, during treatment, such as the former treatment to add oil agent for refining, dyeing assistant using low foam, no foam assistant. Defoaming agent is the type of oil  which is not easy to wave. Use a chelator to improve water quality. Add dispersant to prevent dye agglutination. Clean the cylinder with detergent in time.

5 Shallow brown spots

The main reason is that the pretreatment is not uniform, some parts of the poor wool effect, producing a certain dyeing resistance; Or with a repellent substance; Or there is calcium soap, magnesium soap or uneven mercerization on the cloth during pretreatment;Or semi-finished products drying uneven; Or cloth coated with undissolved powder, soda ash and other solid; Or drip water on the dye before drying; Or dye soft treatment, such as after finishing with the auxiliary stains. Hence, during treatment,  such as strengthening pretreatment, pretreatment agent selection must not be easy to form calcium and magnesium soap. The pretreatment must be uniform and thorough (this is related to the selection of scouring agent, osmotic agent, chelating dispersant, mercerizing osmotic agent, etc.), the powder, soda must be well into the cylinder and the production management must be strengthened.

6 Alkali spot

The main reason is that alkali removal after pretreatment (such as bleaching and mercerizing) is not clean or uniform, resulting in alkali spots, so it is necessary to strengthen the process of alkali removal before treatment.

7 Softener stains-reasons

The film material is not good, there is a block of softener adhesive on the fabric; Too much foam after the film is melted. When the cloth is out of the cylinder, the cloth belt will be soiled with soft agent foam. The water quality is not good, the hardness is too high, the impurities in the water combine with the softener and agglutinate on the fabric. Cloth with anionic substances, in the soft processing, and cation softener combined into a stain, or cloth with alkali, so that the softener coagulate. The softener structure is different, some at higher temperatures cause the softener to change from emulsified state to slag adhered to the fabric. Tar-like softener and other substances from the tank fell down and stuck to the fabric.

8 Silicone oil stains-reasom

Cloth PH value does not reach neutral, especially with alkali, resulting in silicone oil demulsification floating oil. Treatment bath water quality is too poor. Hardness is too high, and silicone oil in >150PPM hardness of water is very easy to float oil. The quality problems of silicone oil include poor emulsification (poor choice of emulsifier, poor emulsification process, too large emulsified particles, etc.), and poor shear resistance (mainly problems of silicone oil itself, such as quality of silicone oil, emulsification system, variety of silicone oil, synthesis technology of silicone oil, etc.).

9 Poor fuzz

Poor fluffing is closely related to the operation of the machine (such as tension control, roller speed). For fuzz, on the softening agent (commonly known as waxing), the control of the dynamic and static friction coefficient of the fabric is the key. f the softener is not used well, it will directly cause a poor fuzz, or even lead to a broken or width change.

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