News Details
No aldehyde flame retardant for cotton
2017-10-20 19:29:26
No aldehyde flame retardant for cotton
The baking temperature and baking time are the important factors affecting the use effect of cotton without aldehydes, directly affecting the crosslinking of flame retardants and fabrics. In order to improve the stability of the flame retardant properties of the fabric, it was used as catalyst for the use of acid-free flame retardants and cotton fabrics in a certain temperature and time. Therefore, the crosslinking reaction must ensure a certain time and temperature, but the temperature is too high, the time too long fabric is brittle, and the fabric feels hard. Should choose 170 ℃ baking conditions of flame retardant, 2 min.
The flame retardant performance was improved with the increase of the dosage of acetal flame retardant. However, when the dosage of flame retardant is increased to a certain extent, the flame retardant performance is no longer improved, and the feeling of the fabric is poor. Meanwhile, the amount of flame retardant will increase the cost. In combination, the amount of flame retardant is suitable for 300g/L.
Because cotton fiber alkali resistant acid, under strong acid conditions strong loss is serious. It can be seen from figure 5 that, with the increase of the pH value of the finishing liquid, the strength of flame retardant fabrics is strengthened, and the strength of the flame retardant fabric is basically undamaged at the pH=6 (the strength value of the non-flame retardant fabric is 603N).
As the pH value increases, the damage length decreases first and then increases, because when the pH is < 4, the damage length decreases with the increase of the pH value. When pH> 4, the increase of pH value is not conducive to the progress of crosslinking reaction, so that the flame retardant property is reduced and the length of damage becomes larger. Comprehensive consideration of strength and flame retardant property, the solution pH value of 4 ~ 5.
The undigested cotton fabric lasts long and is completely destroyed. The damaged length of the flame retardant finishing is 94mm, and the duration of afterburning and smoldering is equal to 0s, which is far less than the b1-grade standard of the flame retardant fabric. (the damage length is less than 150mm, the duration of ignition and the smoldering time is not equal to the 5s). The limit oxygen index (LOI) is 18. One percent goes up to 26. 1% show that the finished fabric has good flame retardant performance. GB/T5455-1997 test method stipulates that the time of contact between flame and fabric is 12s, but the actual test finds: flame and fabric. When contact with 6S, the flame of the fabric gradually extinguishes and no longer burns.
The main reason is that phosphoric acid retardants produced in flame are not volatilize and the air is isolated. At the same time produce poly phosphoric acid has strong dehydration effect, make the carbonized organic matter, the generated carbonized membrane also have played an important role in the air capture large HO, activity and to prevent the spread of flame), so that the fabric has excellent flame retardant performance.
The cracking of cotton fabric can be divided into three stages: the initial lysis stage, the main cracking stage and the residue cracking stage. It can be seen from FIG. 6 that the periodic phase of the cracking of cotton fabric is still in existence. The cracking temperature of each stage of the finished cotton fabric is obviously reduced, and the main cracking stage is more obvious, which is 345. 19-390. 34 ℃ drop to 276. From 73 to 337. 28 ℃, residue from 17 in 700 ci two. 56% increase to 30. 03%.
Triphenyl Phosphate (TPP)
Flame retardant TPP has many advantages, such as excellent transparency, softness, bacterial resistance, and water proof, grease-proof, good electric insulation, as well as good compatibility. Flame retardant TPP is mainly used as the flame-retardant plasticizer for cellulose resin, vinyl resin, natural rubber and synthetic rubber. And it may also be used as the flame-retardant plasticizer for glyceryl triacetate thin ester and film, rigid polyurethane foam, phenolic aldehyde resin, and PPO, etc.
Flame retardant TPP is a kind of halogen-free environment-friendly flame retardant with phosphorus element. Most of the products in the market are self-colored flaky crystal, our product is self-colored crystalline powder, and is more soluble in organic solvents. TPP is not soluble in water, but soluble in benzene, chloroform, ether and acetone, and slightly soluble in Z alcohol. Flame retardant TPP is nonflammable with slight aromatic odor and slight deliquescence. The fusion point is about 50 ℃, and fast melts to hoop-shape when heated. The lubricate effect is excellent, and it is often used as the flame retardant plasticize lubricant. What is more, it is used as the flame retardant for many plastics and resins, such as phenolic aldehyde resin, epoxy resin and so on.
Shows that the flame retardant on flame generated in poly (phosphoric acid has strong dehydration, dehydration and the cotton fiber and carbonized, effectively reduce the fiber decomposition activation energy, so that the temperature of the flame retardant cotton fiber after the cracking stage is decreased obviously. And flame retardant on flame generated in the phosphate layer are cut off from the air, suppresses the sinistral glucose to further cracking, reduces the formation of combustible pyrolysis products, 700 ℃ cracking residue increased 12. 47%.
At present, SEM has been widely used in the analysis of the carbon layer of polyester. Because cotton fibers are different from polyester, the fabric cracking residue has no obvious carbon layer and is still fibrous when analyzed by SEM. It can be seen from figure 7 that the surface of the non-flame retardant fabric is smooth; After finishing the fabric surface adhesive residue pyrolysis products of flame retardant, flame retardant of early cracking effectively suppresses the fabric to continue cracking, more confirmed the condensed phase flame retardant mechanism of the flame retardant.
(1) phosphoric acid ester flame retardants were prepared by using phosphoric acid and ethylene glycol as raw materials and concentrated sulfuric acid as catalyst. The structure of flame retardants was characterized by using the FT 1 IR and H - NMR spectrum.
(2) the molecular mass distribution of phosphate flame retardants is equal to 1,250.
(3) the homemade flame retardant finishing of cotton fabric was used to optimize craft: flame retardant 300 g/L, butane tetracarboxylic acid 80 g/L, 170 ℃ baking 2 min of liquid pH control in 4 ~ 5. The damage length of the cotton fabric is 94mm, the continuous combustion and the smouldering are all 0s, and the LOI value is up to 26. 1%, meets flame retardant woven fabric B1 standard.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
http://www.yaruichem.com
The baking temperature and baking time are the important factors affecting the use effect of cotton without aldehydes, directly affecting the crosslinking of flame retardants and fabrics. In order to improve the stability of the flame retardant properties of the fabric, it was used as catalyst for the use of acid-free flame retardants and cotton fabrics in a certain temperature and time. Therefore, the crosslinking reaction must ensure a certain time and temperature, but the temperature is too high, the time too long fabric is brittle, and the fabric feels hard. Should choose 170 ℃ baking conditions of flame retardant, 2 min.
The flame retardant performance was improved with the increase of the dosage of acetal flame retardant. However, when the dosage of flame retardant is increased to a certain extent, the flame retardant performance is no longer improved, and the feeling of the fabric is poor. Meanwhile, the amount of flame retardant will increase the cost. In combination, the amount of flame retardant is suitable for 300g/L.
Because cotton fiber alkali resistant acid, under strong acid conditions strong loss is serious. It can be seen from figure 5 that, with the increase of the pH value of the finishing liquid, the strength of flame retardant fabrics is strengthened, and the strength of the flame retardant fabric is basically undamaged at the pH=6 (the strength value of the non-flame retardant fabric is 603N).
As the pH value increases, the damage length decreases first and then increases, because when the pH is < 4, the damage length decreases with the increase of the pH value. When pH> 4, the increase of pH value is not conducive to the progress of crosslinking reaction, so that the flame retardant property is reduced and the length of damage becomes larger. Comprehensive consideration of strength and flame retardant property, the solution pH value of 4 ~ 5.
The undigested cotton fabric lasts long and is completely destroyed. The damaged length of the flame retardant finishing is 94mm, and the duration of afterburning and smoldering is equal to 0s, which is far less than the b1-grade standard of the flame retardant fabric. (the damage length is less than 150mm, the duration of ignition and the smoldering time is not equal to the 5s). The limit oxygen index (LOI) is 18. One percent goes up to 26. 1% show that the finished fabric has good flame retardant performance. GB/T5455-1997 test method stipulates that the time of contact between flame and fabric is 12s, but the actual test finds: flame and fabric. When contact with 6S, the flame of the fabric gradually extinguishes and no longer burns.
The main reason is that phosphoric acid retardants produced in flame are not volatilize and the air is isolated. At the same time produce poly phosphoric acid has strong dehydration effect, make the carbonized organic matter, the generated carbonized membrane also have played an important role in the air capture large HO, activity and to prevent the spread of flame), so that the fabric has excellent flame retardant performance.
The cracking of cotton fabric can be divided into three stages: the initial lysis stage, the main cracking stage and the residue cracking stage. It can be seen from FIG. 6 that the periodic phase of the cracking of cotton fabric is still in existence. The cracking temperature of each stage of the finished cotton fabric is obviously reduced, and the main cracking stage is more obvious, which is 345. 19-390. 34 ℃ drop to 276. From 73 to 337. 28 ℃, residue from 17 in 700 ci two. 56% increase to 30. 03%.
Triphenyl Phosphate (TPP)
Flame retardant TPP has many advantages, such as excellent transparency, softness, bacterial resistance, and water proof, grease-proof, good electric insulation, as well as good compatibility. Flame retardant TPP is mainly used as the flame-retardant plasticizer for cellulose resin, vinyl resin, natural rubber and synthetic rubber. And it may also be used as the flame-retardant plasticizer for glyceryl triacetate thin ester and film, rigid polyurethane foam, phenolic aldehyde resin, and PPO, etc.
Flame retardant TPP is a kind of halogen-free environment-friendly flame retardant with phosphorus element. Most of the products in the market are self-colored flaky crystal, our product is self-colored crystalline powder, and is more soluble in organic solvents. TPP is not soluble in water, but soluble in benzene, chloroform, ether and acetone, and slightly soluble in Z alcohol. Flame retardant TPP is nonflammable with slight aromatic odor and slight deliquescence. The fusion point is about 50 ℃, and fast melts to hoop-shape when heated. The lubricate effect is excellent, and it is often used as the flame retardant plasticize lubricant. What is more, it is used as the flame retardant for many plastics and resins, such as phenolic aldehyde resin, epoxy resin and so on.
Shows that the flame retardant on flame generated in poly (phosphoric acid has strong dehydration, dehydration and the cotton fiber and carbonized, effectively reduce the fiber decomposition activation energy, so that the temperature of the flame retardant cotton fiber after the cracking stage is decreased obviously. And flame retardant on flame generated in the phosphate layer are cut off from the air, suppresses the sinistral glucose to further cracking, reduces the formation of combustible pyrolysis products, 700 ℃ cracking residue increased 12. 47%.
At present, SEM has been widely used in the analysis of the carbon layer of polyester. Because cotton fibers are different from polyester, the fabric cracking residue has no obvious carbon layer and is still fibrous when analyzed by SEM. It can be seen from figure 7 that the surface of the non-flame retardant fabric is smooth; After finishing the fabric surface adhesive residue pyrolysis products of flame retardant, flame retardant of early cracking effectively suppresses the fabric to continue cracking, more confirmed the condensed phase flame retardant mechanism of the flame retardant.
(1) phosphoric acid ester flame retardants were prepared by using phosphoric acid and ethylene glycol as raw materials and concentrated sulfuric acid as catalyst. The structure of flame retardants was characterized by using the FT 1 IR and H - NMR spectrum.
(2) the molecular mass distribution of phosphate flame retardants is equal to 1,250.
(3) the homemade flame retardant finishing of cotton fabric was used to optimize craft: flame retardant 300 g/L, butane tetracarboxylic acid 80 g/L, 170 ℃ baking 2 min of liquid pH control in 4 ~ 5. The damage length of the cotton fabric is 94mm, the continuous combustion and the smouldering are all 0s, and the LOI value is up to 26. 1%, meets flame retardant woven fabric B1 standard.
Copyright: Zhang Jia Gang YaRui Chemical co.,Ltd
http://www.yaruichem.com
Spanish
French
Italian
Portuguese
Japanese
Korean
Arabic
Russian