CN103603193B - A kind of flame retardant fabric - Google Patents

Abstract

The invention relates to a flame-retardant cloth, which is a fiber material, specifically including fiber material in the form of woven, knitted or non-fabric, and adopts flame-retardant technology. The flame retardant finishing solution of body, surfactant and high-concentration polyethylene makes it have durable flame retardant performance, and the flame retardant performance does not decrease with the increase of washing times, and this flame retardant finishing does not change the fabric The original characteristics of the fiber, the fabric feels soft, the loss of strength is small, and the comfort and durability of the fabric are basically maintained. It has the characteristics of carbonization in case of fire, self-extinguishing after leaving the fire, and effectively preventing the spread of flames. The protective clothing made of it It can prevent the flame from causing harm to the human body.

Description

a flame retardant fabric

technical field

The invention relates to a flame-retardant cloth, which belongs to the technical field of textile and clothing.

Background technique

Due to the nature of work, clothing fabrics in many industries need to have special properties. For example, domestic and foreign petrochemical, natural gas, fire protection, military police, aviation and other industries all require clothing fabrics with fire-resistant and flame-retardant properties. However, the current production technology of flame-retardant fabrics is all originated from British Aowei Company. The raw material they use is tetrakis hydroxymethyl phosphorus chloride (THPC), but there are halogens in THPC, there are non-environmental factors, and it is flame-retardant. The effect is not very stable, and the flame retardant performance will decrease with the increase of washing times. In addition, "Study on the Toxicity of Tetrahydroxymethylphosphorus Chloride-Urea Initial Formation" published by Wang Liyun et al. shows that the decomposition of THPC will produce formaldehyde, which has adverse effects on the human body.

In view of this, it is necessary to invent a flame-retardant cloth with good flame-retardant effect and safety.

Contents of the invention

The object of the present invention is to overcome the deficiencies in the prior art, and provide a flame-retardant fabric with good flame-retardant effect, safety and environmental protection.

For realizing above-mentioned purpose, the technical scheme that the present invention takes is:

A flame-retardant cloth, which is a fiber material, specifically includes a woven, knitted or non-woven fiber material, which is prepared by the following process:

(1) Flame retardant finishing liquid by padding: padding ordinary cloth with flame retardant finishing liquid, the liquid rolling rate is greater than 70%~85%; the flame retardant finishing liquid contains 400~600g/L tetrakis hydroxymethyl phosphorus sulfate and Low molecular pre-shrinkage body, 4~6g/L surfactant and 10~20g/L high concentration polyethylene (Polyethylene);

(2) Pre-drying: pre-dry the fabric after step (1) padding the flame-retardant finishing solution in a drying oven at 80-90°C for 10-20 minutes;

(3) Ammonia fumigation: the fabric pre-dried in step (2) is subjected to ammonia fumigation treatment in an ammonia fumigation box, and the flow rate of ammonia fumigation is 1200~1500L/min;

(4) Oxidation: Pad the cloth after step (3) ammonia fumigation with an oxidizing solution with a concentration of 30-35%, and the rolling rate is 70%-85%; the speed of padding the oxidizing solution is 30-40m/min , place it for 2~2.5 minutes after padding, and then wash it in water;

(5) Drying: Dry the cloth washed in step (4) in a dryer at 100-110°C for 30-40 seconds.

Further, the amide is urea.

Further, the surfactant is fatty alcohol polyoxyethylene ether.

Further, in the step (4), the washing temperature is 30-40° C., and the washing time is 5-6 minutes.

Further, the oxidation solution in the step (4) is a hydrogen peroxide solution.

Further, a pre-shrinking step is also included.

Further, the low-molecular-weight precondensate of tetrakis hydroxymethyl phosphorus sulfate and amides has a main content of 68-72%, an iron content of less than 0.1%, a viscosity of 50-70, available phosphorus greater than 10%, and a slightly yellowish liquid.

Compared with prior art, the beneficial effect of the present invention is:

The invention adopts THPS-U to make the product more environmentally friendly, safer, non-toxic and tasteless, and replaces the halogen hazard in THPC. After the fabric is padded with flame retardant, the pre-shrinkage body formed by THPS and amide penetrates into the amorphous region and gap of the fiber. Then NH3 is cross-linked with the hydroxymethyl group in the pre-condensation body during ammonia fumigation, and then oxidized to stabilize after forming a flame-retardant polymer inside the fiber. The present invention adopts a unique cross-linking method. According to the characteristics of ammonia, the ammonia fumigation box is independently designed, the ammonia fumigation tank is added, the capacity of the ammonia fumigation box is expanded, the front and rear edges of the fabric are more stable, and the To improve production efficiency, expand the multiple of ammonia fumigation on the original basis. Such flame retardant finishing forms durable cross-linking, which makes it durable flame retardant, and the flame retardant performance does not decrease with the increase of washing times. At the same time, this flame retardant finishing does not change the original characteristics of the fabric fibers. In this way, the original performance of the fabric is maintained, and it has the characteristics of carbonization in case of fire, self-extinguishing after leaving the fire, and effective prevention of flame spread. The protective clothing made of it can prevent the flame from harming the human body and provide effective safety protection for the human body.

The flame retardant finishing liquid in the present invention comprises 400~600 g/L THPS-U, 4~6g/L surfactant and 10~20g/L high concentration polyethylene, polyethylene is compatible in the whole flame retardant system, and It can increase the slippage between yarns, make the fabric soft and smooth, improve the tear strength of the fabric, so as to meet the environmental strength requirements of clothing; the surfactant has strong acid resistance, and assists the flame retardant to penetrate evenly into the yarn In the middle of the thread, the fabric has a high amount of flame-retardant ingredients uniformly, thereby improving the performance of the flame-retardant finishing liquid and high flame-retardant performance. The present inventor has obtained the best composition and ratio of the finishing liquid through a large amount of tests and repeated studies, and has completed the present invention.

The flame-retardant cloth provided by the invention is soft to the touch, has little strength loss, basically maintains the comfort and durability of the fabric, and is suitable for making various protective clothing, bedding, decorative articles, and children's flame-retardant pajamas.

detailed description

The present invention will be further described in detail below in the form of examples, and the implementation details of the present invention will be given, but it should not be considered as a limitation of the present invention.

The THPS-U low-molecular-weight precondensate used in the embodiment of the present invention has a main content of 68-72%, an iron content of less than 0.1%, a viscosity of 50-70, and available phosphorus greater than 10%. It is a slightly yellow liquid.

Example 1

(1) Padding flame retardant finishing solution: Padding ordinary cloth containing 400g/L Flame retardant finishing solution of THPS-U, 6g/L fatty alcohol polyoxyethylene ether and 20g/L high concentration polyethylene, the squeeze rate is greater than 70%~85%;

(2) Pre-drying: Pre-dry the fabric after step (1) padding the flame-retardant finishing solution in a drying oven at 90°C for 20 minutes;

(3) Ammonia fumigation: The fabric pre-dried in step (2) is subjected to ammonia fumigation treatment in an ammonia fumigation box, and the flow rate of ammonia fumigation is 1200L/min;

(4) Oxidation: Put the fabric after ammonia fumigation in step (3) in the oxidizing solution with a concentration of 30%, and the rate of the oxidizing solution is 70%; Then wash in water, specifically water with a temperature of 35°C, and the washing time is 5 minutes;

(5) Drying: Dry the cloth washed in step (4) in a dryer at 100°C for 30 seconds.

Example 2

(1) Padding flame retardant finishing solution: pad 100Kg pure cotton canvas with a flame retardant finishing solution containing 500g/L THPS-U, 5g/L fatty alcohol polyoxyethylene ether and 15g/L high-concentration polyethylene, the rolling rate 85%;

(2) Pre-drying: Pre-dry the fabric after step (1) padding with flame retardant finishing solution in a drying oven at 85°C for 15 minutes;

(3) Ammonia fumigation: The fabric pre-dried in step (2) is subjected to ammonia fumigation treatment in an ammonia fumigation box, and the flow rate of ammonia fumigation is 1300L/min;

(4) Oxidation: Put the cloth after step (3) ammonia fumigation in the oxidizing solution with a concentration of 35%, and the rolling rate is 75%; , and then placed in water at a temperature of 35°C, and the washing time was 5 minutes;

(5) Drying: Dry the cloth washed in step (4) in a dryer at 110°C for 35 seconds;

(6) Pre-shrunk.

Example 3

(1) Padding flame retardant finishing solution: pad 100Kg pure cotton canvas with a flame retardant finishing solution containing 600g/L THPS-U, 4g/L fatty alcohol polyoxyethylene ether and 10g/L high-concentration polyethylene. The rate is 85%;

(2) Pre-drying: Pre-dry the fabric after step (1) padding the flame-retardant finishing solution in a drying oven at 80°C for 10 minutes;

(3) Ammonia fumigation: the fabric pre-dried in step (2) is subjected to ammonia fumigation treatment in an ammonia fumigation box, and the flow rate of ammonia fumigation is 1500L/min;

(4) Oxidation: Put the fabric after ammonia fumigation in step (3) in the oxidizing solution with a concentration of 30%, and the rate of the oxidizing solution is 80%; Then put it in water at a temperature of 40°C, and wash with water for 5 minutes;

(5) Drying: Dry the cloth washed in step (4) in a dryer at 105°C for 35 seconds.

comparative example 1

The steps are the same as those in Example 2, except that the THPS-U in step (1) is replaced by the initial contraction of urea of tetrahydroxymethylphosphorus chloride (THPC).

comparative example 2

The steps are the same as in Example 2, except that no fatty alcohol polyoxyethylene ether is added in step (1).

comparative example 3

The steps are the same as those in Example 2, except that no high-concentration polyethylene compound is added in step (1).

Example 4

Comparing Example 2 of the present invention with Comparative Example 1, the results of various performance parameters tested by "GB/T 5455 Textile Combustion Performance Test: Vertical Method" are shown in Table 1.

Table 1

project Example 2 Comparative example 1 Comparative example 2 Comparative example 3 Standard Class B Afterburning time (S) 0 0 0 0 2 Smoldering time (S) 0 0 0 0 2 Radial damage length (mm) 34.1 73.5 43.7 53.5 100 Weft damage length (mm) 32.0 70.6 40.8 50.6 100 Flame retardant performance after washing 50 times Afterburning time (S) 0 1 0 1 2 Smoldering time (S) 0 1 0 1 2 Radial damage length (mm) 34.9 98.0 48.0 58.0 100 Weft damage length (mm) 33.3 97.3 47.3 57.3 100 Radial tear strength (N) twenty four 19.6 twenty one 19.6 20 Weft tear strength (N) 22.4 18.4 22.4 17.6 20

It can be seen from Table 1 that the flame-retardant cloth provided by the present invention has a good flame-retardant effect, and it can still ensure good flame retardancy after repeated washing.

Example 6

Comparing Example 2 of the present invention with Comparative Example 1, after washing at 95°C for 50 times, the hand feeling was evaluated on a scale of 1-5, wherein 1 indicated poor/rough hand feeling, and 5 indicated very comfortable and soft hand feeling. The hand feeling of the fabric in Test Example 2 was 2, the hand feeling of Comparative Example 1 was 5, and the hand feeling of Comparative Example 3 was 4.

The flame retardant cloth provided by the present invention has excellent flame retardant effect and meets the requirements of the international GB-8965-98 <flame retardant protective clothing>. Meet ISO, EN11611(EN470-1)/ISOEN11612(EN531)/ASTMD6413/NFPA2112/BS5852/ASTM1506/ENV50354 and other standards. It is low-toxic and environmentally friendly, safe and reliable for the human body, breathable, moisture-permeable, soft to the touch and comfortable to wear.

The above embodiments are only used to illustrate the technical solutions of the present invention without limitation. Although the present invention has been described in detail with reference to preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced. Without departing from the spirit and scope of the technical solutions of the present invention, all of them should be included in the scope of the claims of the present invention.

Claims (3)

1. a flame retardant fabric, which is fibrous material, specifically includes woven, knitting or non-woven form fibrous material, it is characterised in that: prepared by the following technique of concrete employing:

(1) fire retarding treating liquid is padded: common cloth is padded fire retarding treating liquid, pick-up rate 85%；Described fire retarding treating liquid comprises the low molecule preshrunk body of 400 ~ 600g/L tetrakis hydroxymetyl phosphonium sulfuric and acid amides, 4 ~ 6g/L surfactant and the highly concentrated polyethylene of 10 ~ 20g/L；

(2) prebake: the prebake 10 ~ 20min in the drying baker of 80 ~ 90 DEG C of the cloth after step (1) is padded fire retarding treating liquid；

(3) ammonia cure: the cloth after step (2) prebake is carried out in ammon-smoking box ammonia cure process, and ammonia cure flow is 1200 ~ 1500L/min；

(4) aoxidize: the cloth after step (3) ammonia cure is padded oxidation solution that concentration is 30 ~ 35% again, and pick-up rate is 70% ~ 85%；The speed padding oxidation solution is 30 ~ 40m/min, places 2 ~ 2.5min, then clean in water after padding；

(5) dry: the cloth after washing step (4) dries 30 ~ 40s in the dryer of 100 ~ 110 DEG C；

Described acid amides is urea；

Described surfactant is AEO；

In described step (4), oxidation solution is hydrogen peroxide solution.

2. a kind of flame retardant fabric according to claim 1, it is characterised in that: in described step (4), washing temperature is 30 ~ 40 DEG C, and washing time is 5 ~ 6min.

3. a kind of flame retardant fabric according to any one of claim 1 or 2, it is characterised in that: content 68-72% based on the low molecule preshrunk body of described tetrakis hydroxymetyl phosphonium sulfuric and acid amides, iron content is less than 0.1%, and viscosity 50-70, available phosphorus is more than 10%, slightly yellow liquid.