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Your location: Home > Related Articles > A breakthrough has been achieved in the sustainable and formaldehyde-free flame retardant finishing technology of pure cotton.

A breakthrough has been achieved in the sustainable and formaldehyde-free flame retardant finishing technology of pure cotton.

Author:QINSUN Released in:2022-12 Click:143

Product introduction

According to the statistics of international fire brigades, there are 6-7 million fires in the world every year. Fires accounted for more than 80%, of which bedding, home textiles and clothing were the main causes of fire. Textiles and clothing are in direct contact with humans. Once they burn, they can cause partial burns on the skin and cause pain. In addition, the harmful gases produced by the burning of textiles are also harmful to human life, such as carbon monoxide, carbon dioxide, nitrogen oxides, ammonia and aldehyde gases, etc., causing people to suffocate or poison and die.

The so-called flame-retardant textile refers to textiles made of flame-retardant fibers or textiles after flame-retardant finishing, which reduces flammability to varying degrees. Textiles that slow their burning rate quickly self-extinguishnd is after leaving the fire source and releases less toxic smoke, so they have non-flammable properties.

Current flame retardant textile finishing process

Fiber flame retardant and fabric flame retardant (i.e. fabric finish). Compared with flame retardant fiber production, flame retardant finishing is more flexible. It can make the fabric flame retardant according to the final use requirements of the product and can be combined with other finishes such as waterproof, antibacterial and antistatic for multi-purpose finishes. The process is simple.

The flame retardant finishing method of the fabric should be determined based on the structure of the fabric, end use and flame retardant performance requirements and other factors.

There are generally four finishing processes:

1. Dip and dry method

Dip and dry method is also called exhaustion method, is itimpregnating the fabric with a finishing solution containing a flame retardant or a certain time and then drying it, so that the flame retardant is soaked into the fiber and the flame retardant and fiber molecules are adsorbed by the van der Waals force. In general, the flame retardant effect obtained by the dipping and drying method is not durable, the flame retardant is easy to fall off after washing, and the fabric loses the flame retardant effect.

2. Filling and baking method

The process of filling and baking method is filling → drying → baking → washing after treatment. Filling is also generally composed of flame retardants, crosslinking agents, catalysts, additives and surfactants, etc. The excess is determined according to the type of fabric and the performance requirements of the flame retardant. Drying is generally carried out at about 100°C. The firing temperature is based on Determination of flame retardant, cross-linking agent and fiberltype

3. Coating method

The coating method is to mix the flame retardant into the coating agent, and the coating is coated by the coating machine. The coating agent is applied to the surface of the fabric, and after drying, the coating agent is cross-linked to form a film, and the flame retardant is evenly distributed in the coating film to play a role in flame retardancy. When the flame retardant is insoluble in water or cannot be mixed with the fiber Coating processes can be used when the molecules form crosslinks.

4. Continuous spray method

Continuous spray method is generally applied to large curtains, carpets, etc. The flame retardant finish is done by manual spray method. In addition, for fabrics with fluff patterns, tufts and piles on the surface, if the filling method will damage the fluff patterns on the surface, the continuous spray method is generally used.

Textile Flame Retardant Test Method

1. 45 degree combustion test method:

For a sample placed in a 45 degree direction, measure the time required or measure the post-burning and smoldering time, the damaged area and the damaged length of the sample after burning, or measure the burning time of the sample until the sample is burned. The number of times the flame must be removed from the bottom by a certain distance. This method is applicable to the flammability test of edible textiles. Compliant standards are: ASTM D1230, FTMS 191-5908, CFR 16 Part1610, CAL IF TB117, NFPA702, GB/T 14644.

2. Test method for horizontal flammability:

To ensure that the horizontally placed sample ignites according to the standard time, measure the distance and time of the flame spread and use the flame spread rate to characterize the resistance of the fabric. flammable properties. This methode is suitable for testing all kinds of textiles, especially automotive interior fabrics. Compliant standards are: ISO 3795, FMVSS 302, DIN 75200, SAE J369, ASTM D5132, JIS D1201, AU169, FZ/T 01028.

3. Green Burning Test Method:

Ignite the sample directly under the vertically suspended sample strip and test the afterflame time, smoldering time and damage length or area of ​​the sample to evaluate the flame retardant properties of the fabric. This method is suitable for testing the combustion properties of children\'s clothing, decorative fabrics, laminated fabrics, coated fabrics, etc. Compliant standards include ASTM D6413-99, DOC-FF 3/71, CALIF TB-117, GB/T 5455, CPAI -84.