Detailed knowledge of flame retardant fabrics–An Lintian

3.Semi-washable fire-retardant fabric

4.Disposable fire-retardant fabric (decoration, curtains, cushions, etc.)

3.1、 The fire prevention mechanism refers to adding a certain fire retardant to some inherently flammable raw fibers (such as polyester, cotton, polyacrylonitrile fiber) to inhibit free radicals during the combustion process; or to change the thermal decomposition process of the fiber to promote dehydration Carbonization; in some cases, the fire retardant decomposes and releases non-flammable gas to cover the surface of the fiber and isolate the air.

2.Fire protection treatment method

1)Improve the strength of fiber-forming polymers Thermal stability

2)raw silk Fireproof modification

Fabric waterproofPost-fire finishing:

1, Fireproof Mechanism

1 ) Covering layer theory: Fire retardant can form a glassy or stable foam covering layer at high temperatures, which has the functions of heat insulation, oxygen insulation, blocking combustible gas from escaping outward, and playing a fire prevention role.

2) Non-combustible gas theory: The fire retardant decomposes into non-combustible gas when heated, and the concentration of combustible gas decomposed from cellulose is diluted below the lower combustion limit.

3) Endothermic theory: Fire retardant reacts endothermically at high temperatures, lowering the temperature to prevent the spread of combustion. In addition, the heat can be transferred out quickly after fabric finishing, so that the cellulose cannot reach the temperature of ignition and combustion.

4) Chemical reaction theory (catalytic dehydration theory): Fire retardant reacts as a Lewis acid with fibers at high temperatures, causing catalytic dehydration and carbonization of fibers, reducing the generation of flammable gases.

2. Fireproof finishing method

1)Padding baking method: It is a widely used fireproofing finishing process. The process flow is padding–pre-baking–Baking–post-processing. Padding fluid is generally composed of fire retardants, catalysts, resins, wetting agents and softeners, and is configured into an aqueous solution or emulsion for post-finishing.

2)dipping Baking method (absorption method): After immersing the tissue in the fire-proof liquid for a certain period of time, it is then dried and baked so that the fire-proof liquid is absorbed by the fiber polymer.

3)Organic solvent method: Yes The advantage of using non-water-soluble fire retardants is low energy consumption during fire retardant finishing. However, in actual operation, attention should be paid to the toxicity and flammability of solvents.

4)Coating method: The fire retardant is mixed into the resin, and the fire retardant is fixed on the fabric by the adhesive effect of the resin. According to different mechanical equipment, it is divided into blade coating method and pouring coating method.

4. The back of the fireproof cloth Finishing technology and commonly used additives

At present, the mainstream fire protection processes include the prophenyl ammonia fumigation process and CPPost-finishing process. The proben process is suitable for formaldehyde that is not suitable for work clothes that are not worn close to the body. The advantage is that the loss of breaking strength of the fabric is small. The relative fastness of fabrics made from the same natural cotton fabric after finishing is much higher. Generally, Luben can basically meet the GB8965.1-2009 B standard requirements, and CPcan only meet the C level standard , it is basically difficult to achieve the BBlevel standard. However, for fire-proof clothing that is close to the skin, it is not recommended to use fabrics with proben finishing technology, but it is recommended to use CPCPCP with low formaldehyde content. >Craft or permanent fire-resistant fabrics such as acrylonitrile and Nomex. For customers with higher requirements for color and feel, it is also recommended to use CPCP technology or fire-retardant fabrics made of acrylonitrile and Nomex. Currently, Most of the customers’ coats are made of fire-resistant workwear using the proben process and then finished with fire-resistant fabrics.

(The addition of formaldehyde-removing additives to the Prubenzene process can control the formaldehyde content below 75PPm）

Process flow:

Pluben: padding fireproof finishing liquid → pre-drying → ammonia fumigation → washing → drying → pre-shrinking → finished product (requires hot air primer and ammonia fumigation machine)

2、CP: padding fireproof finishing liquid → pre-drying → baking → washing → drying → pre-shrinking → finished product (general dyeing factories can do it)

Commonly used additives:

According to the application method, they are divided into additive fire retardants and reactive fire retardants. According to the composition, additive fire retardants Agents mainly include inorganic fire retardants, halogen fire retardants(organic chlorides and organic bromides), phosphorus fire retardants(red phosphorus, phosphate esters and Halogenated phosphates, etc.)and nitrogen-based fire retardants, etc.

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