Detailed explanation of fabric three-proof (waterproof, oilproof and antistatic) finishing process

Keywords: cotton, polyester-cotton, water-repellent, oil-proof, decontamination, easy to decontaminate and finish

1 Preface

Functional fabrics have a variety of protective functions, thus expanding their scope of use, especially the protective and health-care properties that have beneficial effects on the human body, so the demand has increased year by year in recent years. Over the years, our company has produced a series of workwear fabrics with various functions for domestic and foreign customers. The main varieties include cotton, polyester-cotton, polyester-covered cotton and other woven fabrics, such as: cotton, polyester-cotton, three-proof and easy to remove stains after finishing. The fabric requirements are: water-blocking, oil-proof, decontamination and easy to decontaminate. The customer’s protective finishing requirements for this product are as follows:

Water blocking: 90-100 minutes initially, 70 minutes after 10 washes

Oil-proof: Initial Level 6 Wash 10 times Level 3

Decontamination: Initial Level 4 Wash 10 times Level 3

Easy to remove stains: initial level 4
Wash 10 times, level 3-4

2 Basic Principles

2.1 Mechanism of three-proof finishing

2.1.1 Design principles of water-blocking and breathable fabrics

Water-blocking and breathable fabrics mainly use the difference between the small diameter of external water droplets (20-100 um) and the diameter of human moisture molecules (0.0003-100 um) to make the structural gaps of the designed fabric both It can block the entry of small water droplets from the outside and allow human sweat to be emitted through the fabric. According to the water-repellent and breathable mechanism of fabrics, water-repellent and breathable fabrics can be designed and produced from the following aspects: high-density fabrics, PU-coated fabrics, laminated fabrics and fabrics with functional finishing of fabrics

It can be seen from the basic principle of three-proof finishing: the three-proof finishing is to reduce the surface tension of the fiber through the action of finishing agent, which is lower than the surface tension of water and oil stains, thereby achieving the three-proof Purpose.

2.2 Cleaning up after decontamination

Polyester and other synthetic fibers are hydrophobic and lipophilic fibers, which are very easy to stain and difficult to wash off after being stained with oil.

And re-contamination often occurs during repeated cleaning processes. This phenomenon also occurs when cleaning blended chemical fiber fabrics. After the cotton fiber is treated with anti-wrinkle resin, the hydroxyl groups are blocked to a certain extent, the hydrophilicity is reduced, and staining will also occur. The purpose of post-decontamination finishing is to improve these shortcomings.

After decontamination, it is called SR finishing abroad. SR finishing has two meanings. One is easy decontamination (Soil
Release) finishing,

One ​​is soil repellent finishing. Later, on the basis of fluorine-containing stain-repellent finishing agents, hydrophilic groups were introduced, which developed into a product with the dual functions of stain-repelling and improving grease shedding properties.

2.2.1 Main sources of fabric contamination

The composition of oil pollution is particularly complex and can be roughly divided into three categories:

(1) Solid particle dirt (such as soot, soil, rust, etc.);

(2) Oil and fatty substances (such as machine oil, beef tallow, indoor cooking grease, fat excreted from the body, etc.);

(3) Water-soluble substances (cosmetics, ink, coffee, etc.).

2.2.2 There are generally three ways of contamination on fabrics:

(1) Physical contact: For example, clothing cuffs, collars, etc. are often in contact with the skin and are easily contaminated with fat and dirt. Hydrophobic and lipophilic fibers are more likely to be contaminated.

(2) Electrostatic adsorption: The surface conductivity and hygroscopicity of hydrophobic synthetic fibers such as polyester are very low. Static electricity is easily generated during friction. Particulate dust in the air is caused by friction or induction. Also easily charged, charged particlesDust

Dirt often interacts with the static electricity generated on the fabric, adsorbing it and forming dirt on the fabric.

(3) Re-contamination during cleaning: The critical surface tension of hydrophobic synthetic fibers such as polyester in water is much greater than that in the atmosphere, so the oil stains on the fabric are not easy to wash off and are easily susceptible to damage. Dirt floating in the cleaning fluid is recontaminated.

2.2.3 Decontamination mechanism

Solid dirt is mainly deposited on fabric surface irregularities, fiber gaps, intersecting points, etc. due to static electricity adsorption when in contact with dirt. Grease dirt is mainly deposited through mechanical adsorption and chemical forces ( van der Waals forces and adhesion forces) combined with the fabric surface. Increase the smoothness and antistatic properties of the fabric surface, which can reduce the deposition of solid dirt. To prevent contamination of liquid and oily dirt, the fabric should be made to have water- and oil-repellent properties. The water-repellent and oil-repellent properties of the fabric are based on limited wetting as the condition and premise.

After melt spinning to produce anti-fouling fibers, the filaments are treated with an oil containing a hydrophobic smoothing agent (solid at room temperature), and then heated, drawn and crimped. Make other oil ingredients except hydrophobic smoothing agent fall off. For example, the stain-resistant colored carpet yarn invented in Japan is made by melt-spinning a thermoplastic polymer containing liquid color pigments and then finishing it by the above method.

Conduct easy stain-repellent finishing and water-repellent and oil-repellent finishing on fabrics. There are many kinds of water- and oil-repellent finishing agents and finishing processes for fabrics, which can be optimized through experiments.

3 Three-proof, easy decontamination finishing process

It has been proved through experiments that the three-proof finishing and the easy-decontamination finishing will affect each other. In order to solve this problem, we found the process balance point after many experiments: adopt the three-proof and easy-decontamination The one-bath padding process of finishing agent goes through drying, baking and other processes, so that the fabric can achieve the three-proof effect and achieve the purpose of easy decontamination.

3.1 Finishing varieties

Pure cotton 20×16
128×60; T/C 20×16 128×60; CVC 32×32 130×70

3.2 Process flow:

Input cloth (coloring and unloading cloth → finishing liquid after padding (75% liquid rate → drying → baking (180℃, 40-45 seconds) → cooling → cloth dropping → pre- Shrinking

3.3 Process prescription:

Three-proof, easy to remove and finish (one bath)

Prescription 1:

HPC-6 60g/l Recipe 2: EASY 40-60g/l

CP-R 60g/l
GA-2 20-40g/l

Substitute acid 2g/l Substitute acid 2g/l

4 Product Testing

4.1 test standard:

Water blocking is tested according to AATCC193-2007 standard IS09865: 1991 standard;

Oil resistance is tested according to AATCC118-2007 standard;

Easy to remove stains according to AATCC130-2010 standard test.

4.2 test results:

Three defenses:

(1) Pure cotton 20×16 128×60

Initial: water repellent 100 points After washing 10 times: water repellent 70-80 points

Oil-proof Level 6 Oil-proof Level 3

Decontamination level 4 Decontamination level 3

Easy to decontaminate Level 4 Easy to decontaminate Level 3-4

(2)
T/C20×16 128×60

Initial: water repellent 100 points After washing 10 times: water repellent 70-80 points

Oil-proof Level 6 Oil-proof Level 3

Decontamination level 5 Decontamination level 3

Easy to decontaminate Level 4 Easy to decontaminate Level 3-4

Passed inspection: all functional indicators meet customer requirements;

Color fastness: all meet the national standard.

5 Conclusion

Three-proof post-finishing uses the effect of post-finishing agents to reduce the surface tension of the fiber, lower than the surface tension of water and oil stains,

It has water-repellent and oil-repellent properties to achieve three-proof purposes. Through process optimization, HPC-6 three-proof finishing agent and easy decontamination are selected

The finishing agent CP-R (or the three-proof finishing agent EASY easy decontamination finishing agent GA-2) can reach the balance point between the conflict between the three prevention and easy decontamination, thus achieving Product functional finishing requirements.

After finishing, the dyeing fastness all reaches the national standard, and all functional indicators can meet the requirements.

AAAFYYTRUYJY76I

Disclaimer:

Disclaimer: Some of the texts, pictures, audios, and videos of some articles published on this site are from the Internet and do not represent the views of this site. The copyrights belong to the original authors. If you find that the information reproduced on this website infringes upon your rights, please contact us and we will change or delete it as soon as possible.

AAA; Oil-proof Level 3

Decontamination level 5 Decontamination level 3

Easy to decontaminate Level 4 Easy to decontaminate Level 3-4

Passed inspection: all functional indicators meet customer requirements;

Color fastness: all meet the national standard.

5 Conclusion

Three-proof post-finishing uses the effect of post-finishing agents to reduce the surface tension of the fiber, lower than the surface tension of water and oil stains,

It has water-repellent and oil-repellent properties to achieve three-proof purposes. Through process optimization, HPC-6 three-proof finishing agent and easy decontamination are selected

The finishing agent CP-R (or the three-proof finishing agent EASY easy decontamination finishing agent GA-2) can reach the balance point between the conflict between the three prevention and easy decontamination, thus achieving Product functional finishing requirements.

After finishing, the dyeing fastness all reaches the national standard, and all functional indicators can meet the requirements.

AAAFYYTRUYJY76I

Disclaimer:

Disclaimer: Some of the texts, pictures, audios, and videos of some articles published on this site are from the Internet and do not represent the views of this site. The copyrights belong to the original authors. If you find that the information reproduced on this website infringes upon your rights, please contact us and we will change or delete it as soon as possible.

AA