CN101503828A - Chemical degumming technique for pineapple leaf fiber - Google Patents

Abstract

The invention discloses an ananas hemp chemical degumming process. The process is characterized in that: the process comprises the following steps of ananas hemp piecing out and caging, pre-pickling, boiling, washing, pickling, denaturation, acid washing, washing, lignin removal, washing, greasing and drying procedures. The boiling comprises the following steps: adding the fibril into a 30 percent mixed liquor which is prepared from liquid alkali, trisodium phosphate and water glass and has a weight 15 to 17 folds of that of the fibril, keeping the pressure of 0.1 to 0.15 MPa for 4 to 4.5 hours, and taking out the fibril and washing the fibril by water. The mixed liquor used for boiling the fibril comprises 10 to 12 g/L of the liquid alkali, 0.4 to 0.6 g/L of the trisodium phosphate and 2 to 2.5 g/L of the water glass. The liquid alkali boiling eliminates non-cellulose substances in the ananas hemp, and makes the ananas hemp have a high capillary penetration action. The fiber molecules have relatively uniform lengths; the fiber fineness is high and reaches 550 yarns; and therefore the ananas hemp is suitable for spinning.

Description

A kind of chemical degumming process of pineapple leaf fiber

technical field

The invention relates to a fibril degumming process in the application field of textile technology, in particular to a chemical degumming process for pineapple leaf fibers.

Background technique

Pineapple leaf fiber is a fiber extracted from pineapple leaves and belongs to vein fiber. Relevant studies have shown that after deep processing, this fiber has higher strength than cotton, white appearance, soft and smooth, and feels like silk like linen. It can be blended with natural fibers or synthetic fibers. The fabric is easy to print and dye, sweat-absorbent and breathable, and crisp. It is suitable for making all kinds of medium and high-grade suits, shirts, dresses, ties and various decorative fabrics. In addition, pineapple leaf fiber also has good antibacterial and antibacterial properties.

At present, the utilization of pineapple leaf fiber abroad is still in the research and development stage. In the Philippines, the method of degumming pineapple leaf fibers is: soak the fibers in 0.05% wetting agent for 1 hour, then boil in 5% sodium hydroxide and 0.05% sodium bisulfate solution for 2 hours, and finally use 3% acetic acid solution wash. Yarns spun from this fiber are stiff and not suitable for textile mills, requiring a better softening process.

The domestic Guangxi Silk Hemp Research Institute has also explored a whole set of technology such as pineapple leaf selection, scraping, degumming, fiber scouring and bleaching, etc., and made 160kg of pineapple leaf dry hemp, and tried to weave 100T/2(50: 50) More than 100 meters of pineapple hemp, cassava (silkworm) silk blended fabric, but the fabric is relatively hard, and the degumming technology does not meet the requirements of textile product production. Since the 1990s, China Textile University has also carried out systematic research and exploration on the properties, structure, degumming, and spinning of pineapple leaf fibers. However, the degummed fibers are not soft enough and can only be blended with other fibers. Can only be spun out the yarn of 10 public counts, still have a big gap with the requirement of 20-40 public counts of hemp products of current market demand, also can not be applied to production.

So, so far, there is no pineapple leaf fiber degumming process technology suitable for production both at home and abroad.

Contents of the invention

In order to overcome above-mentioned deficiency, the object of the present invention is to provide the hardness that can reduce pineapple leaf fiber, improve fiber fineness and softness, thereby make it be applicable to the chemical degumming process of pineapple leaf fiber of textile production.

For solving the problems of the technologies described above, the technical scheme adopted in the present invention is: a kind of pineapple leaf fiber chemical degumming process, it is characterized in that adopting following steps:

(1) the fibrils are divided into cages;

(2) Pre-soaking acid: Put the fibrils into the H ₂ SO ₄ solution with a concentration of 2.5-3.5g/L, the bath ratio is 1:15-17, soak at room temperature for 40-50min, and take out the raw hemp;

(3) Scouring: the fibrils are put into a mixed solution prepared by mixing 30% liquid alkali, trisodium phosphate and water glass with a concentration of 15 to 17 times its weight, and the pressure is maintained at 0.1 to 0.15 MPa. After 4 to 4.5 hours, take out the original hemp and rinse with water;

(4) Pickling: Put the fibrils into the H ₂ SO ₄ solution with a concentration of 2.5-3.5g/L, the bath ratio is 1:15-17, soak for 20 minutes at room temperature, and take out the raw hemp;

(5) Denaturation: the fibrils are put into a mixed solution prepared by 30% liquid caustic soda and soda ash at a concentration of 15 to 17 times its weight, soaked at room temperature for 10 minutes, and take out the original hemp;

(6) Pickling: put the fibrils in 65-70g/L H ₂ SO ₄ solution, rinse until the yellow color of the fibers fades, turn white, and there should be no black lumps, take out the raw hemp and rinse with clean water;

(7) Delignification: the fibrils are put into a mixed solution prepared by 30% hydrogen peroxide and 30% liquid alkali with a concentration of 15 to 17 times its weight, and the pressure is kept at 0.1 to 0.15 MPa, and the holding time is 1 Hours, take out the raw hemp and rinse with clean water;

(8) Oiling: Soak the fibrils in hot water at 80-100°C containing emulsified oil for 30 minutes;

(9) The fibrils are dehydrated, shaken, and dried to obtain a lean product.

The content of liquid alkali in the mixed solution used in the scouring process described in the process of the present invention is 10-12g/L, the content of trisodium phosphate is 0.4-0.6g/L, and the content of water glass is 2-2.5g/L.

The content of liquid caustic soda used in the denaturing process described in the process of the present invention is 50-55 g/L, and the content of soda ash is 60-65 g/L.

The content of hydrogen peroxide used in the delignification process described in the process of the present invention is 8-10 g/L, and the content of liquid caustic soda is 3.5-4.5 g/L.

The content of the emulsified oil described in the process of the invention is 0.9-1.2% of the weight of the original fiber.

The beneficial effect of the present invention is that: scouring with lye can dissolve the non-cellulose substances in the pineapple leaf fiber, so that the pineapple leaf fiber has a high degree of capillary penetration, the fiber molecular length is relatively consistent, and the fiber fineness is high, reaching 550 counts, good for spinning.

Description of drawings

Below in conjunction with accompanying drawing and specific embodiment the present invention is described in further detail:

FIG. 1 is a schematic diagram of the network structure of the present invention in practical application.

Example 1

As shown in Figure 1, a kind of pineapple leaf fiber chemical degumming process is characterized in that following steps are adopted:

(1) The fibrils are divided into cages, and each cage is filled with 300kg of fibrils;

(2) Pre-soaking acid: put 300kg of fibrils into _{the H2SO4} solution with a concentration of 2.5g/L, the bath ratio is 1:15, and soak for 40min at room temperature;

(2) Scouring: Put the fibrils into 4500kg of mixed solution, keep the pressure at 0.1MPa, and hold the pressure for 4 hours. The mixed solution is prepared by mixing liquid caustic soda with a concentration of 30%, trisodium phosphate and water glass. Wherein, the content of liquid caustic soda is 10g/L, the content of trisodium phosphate is 0.4g/L, and the content of water glass is 2g/L;

(3) Washing: rinse the scorched fiber with clear water until the pH value is 7;

(4) Pickling: Put the fibrils into H ₂ SO ₄ solution with a concentration of 2.5g/L, the bath ratio is 1:15, and soak for 20 minutes at room temperature;

(5) Denaturation: Put the fibrils into 4500kg of mixed solution and soak at room temperature for 10 minutes. The mixed solution is prepared from liquid caustic soda and soda ash with a concentration of 30%. Wherein, the content of liquid caustic soda is 50g/L, and the content of soda ash is 60g/L;

(6) Pickling: put the fibrils in 65g/L H ₂ SO ₄ solution, and rinse until the yellow color of the fibers fades and turns white without black lumps;

(7) Washing: rinse the fibrils with clear water until the pH value is 7;

(8) Delignification: the fibrils are put into 4500kg mixed solution, the pressure is maintained at 0.1 MPa, and the pressure holding time is 1 hour; the mixed solution is prepared from 30% hydrogen peroxide and 30% liquid caustic soda. Wherein, the content of hydrogen peroxide is 8g/L, and the content of liquid caustic soda is 3.5g/L;

(9) Washing: rinse the fibrils with clear water until the pH value is 7;

(10) Oiling: Soak the fibrils in 80°C hot water with emulsified oil for 30 minutes. Wherein the emulsified oil content is 0.9% of the original fiber weight;

(11) The fibrils are dehydrated, shaken, and dried to obtain a lean product.

Example 2

(1) The fibrils are divided into cages, and each cage is filled with 300kg of fibrils;

(2) Pre-soaking acid: put 300kg of fibrils into _{the H2SO4} solution with a concentration of 3.0g/L, the bath ratio is 1:16, and soak for 45min at room temperature;

(3) Scouring: Put the fibrils into 4800kg of mixed solution, keep the pressure at 0.13MPa, and hold the pressure for 4.2 hours. The mixed solution is prepared by mixing liquid caustic soda with a concentration of 30%, trisodium phosphate and water glass. Wherein, the content of liquid caustic soda is 11g/L, the content of trisodium phosphate is 0.5g/L, and the content of water glass is 2.3g/L;

(4) Washing: rinse the scorched fiber with clear water until the pH value is 7;

(5) Pickling: Put the fibrils into the H ₂ SO ₄ solution with a concentration of 3.0g/L, the bath ratio is 1:16, and soak for 20 minutes at room temperature;

(6) Denaturation: Put the fibrils into 4800kg of mixed solution and soak at room temperature for 10min. The mixed solution is prepared from liquid caustic soda and soda ash with a concentration of 30%. Wherein, the content of liquid caustic soda is 53g/L, and the content of soda ash is 63g/L;

(7) Pickling: put the fibrils in 67g/L H ₂ SO ₄ solution, rinse until the yellow color of the fibers fades, turn white, and there should be no black lumps;

(8) Washing: rinse the fibrils with clear water until the pH value is 7;

(9) Delignification: the fibrils are placed in 4800 kg of mixed solution, and the pressure is maintained at 0.13 MPa for 1 hour. The mixed solution is prepared from 30% hydrogen peroxide and 30% liquid caustic soda. Wherein, the content of hydrogen peroxide is 9g/L, and the content of liquid caustic soda is 4.0g/L;

(10) Washing: rinse the fibrils with clear water until the pH value is 7;

(11) Oiling: Soak the fibrils in 90°C hot water containing emulsified oil for 30 minutes. Wherein the emulsified oil content is 1.0% of the original fiber weight;

(12) The fibrils are dehydrated, shaken, and dried to obtain a dry product.

Example 3

(1) The fibrils are divided into cages, and each cage is filled with 300kg of fibrils;

(2) Pre-dipping acid: put 300kg of fibrils into _{the H2SO4} solution with a concentration of 3.5g/L, the bath ratio is 1:17, and soak for 50min at room temperature;

(3) Scouring: Put the fibrils into 5100kg of mixed solution, keep the pressure at 0.15MPa, and hold the pressure for 4.5 hours. The mixed solution is prepared by mixing liquid caustic soda with a concentration of 30%, trisodium phosphate and water glass. Wherein, the content of liquid caustic soda is 12g/L, the content of trisodium phosphate is 0.6g/L, and the content of water glass is 2.5g/L;

(4) Washing: rinse the scorched fiber with clear water until the pH value is 7;

(5) Pickling: Put the fibrils into the H ₂ SO ₄ solution with a concentration of 3.5g/L, the bath ratio is 1:17, and soak for 20 minutes at room temperature;

(6) Denaturation: put the fibrils into 5100 kg of mixed solution, soak at room temperature for 10 min. The mixed solution is prepared from liquid caustic soda and soda ash with a concentration of 30%. Wherein, the content of liquid caustic soda is 55g/L, and the content of soda ash is 65g/L;

(7) Pickling: Put the fibrils in 70g/L H ₂ SO ₄ solution, rinse until the yellow color of the fibers fades, turn white, and there should be no black lumps;

(8) Washing: rinse the fibrils with clear water until the pH value is 7;

(9) Delignification: Put the fibrils into 5100 kg of mixed solution, keep the pressure at 0.15 MPa, and hold the pressure for 1 hour. The mixed solution is prepared from 30% hydrogen peroxide and 30% liquid caustic soda. Wherein, the content of hydrogen peroxide is 10g/L, and the content of liquid caustic soda is 4.5g/L;

(10) Washing: rinse the fibrils with clear water until the pH value is 7;

(11) Oiling: Soak the fibrils in 100°C hot water containing emulsified oil for 30 minutes. Wherein the emulsified oil content is 1.2% of the original fiber weight;

(12) The fibrils are dehydrated, shaken, and dried to obtain a dry product.

Claims (5)

1, a kind of chemical degumming technique for pineapple leaf fiber is characterized in that adopting the following step:

(1) fibrillation divides the dress cage;

(2) pre-pickling: fibrillation is put into the H that concentration is 2.5～3.5g/L ₂SO ₄In the solution, bath raio is 1:15～17, soaks 40～50min at normal temperatures, takes out raw ramie;

(3) kiering: the concentration that fibrillation is put into 15～17 times of its weight is the mixed solution that 30% liquid caustic soda, tertiary sodium phosphate and waterglass mixed preparing form, and the 0.1～0.15MPa that keep-ups pressure, takes out the raw ramie flushing with clean water at 4～4.5 hours dwell times;

(4) pickling: fibrillation is put into the H that concentration is 2.5-3.5g/L ₂SO ₄In the solution, bath raio is 1:15～17, and normal temperature soaks 20min down, takes out raw ramie;

(5) sex change: the concentration that fibrillation is put into 15～17 times of its weight is 30% liquid caustic soda and the formulated mixed solution of soda ash, and soak at room temperature 10min takes out raw ramie;

(6) pickling: fibrillation is put into the H of 65～70g/L ₂SO ₄In the solution, rinsing to fiber yellow takes off, and turns white, and black patch can not be arranged, and takes out the raw ramie flushing with clean water;

(7) delignification: what fibrillation was put into 15～17 times of its weight is 30% hydrogen peroxide and 30% the formulated mixed solution of liquid caustic soda by concentration, the 0.1～0.15MPa that keep-ups pressure, and 1 hour dwell time was taken out the raw ramie flushing with clean water;

(8) oil supply: fibrillation soaks 30min in containing 80～100 ℃ of hot water of oil emulsion;

(9) fibrillation dewaters, trembles fiber crops, oven dry, get final product refined silk.

2. chemical degumming technique for pineapple leaf fiber according to claim 1 is characterized in that: described content to liquid caustic soda in the used mixed solution of raw ramie kiering is 10～12g/L, and the content of tertiary sodium phosphate is 0.4～0.6g/L, and the content of waterglass is 2～2.5g/L.

3. chemical degumming technique for pineapple leaf fiber according to claim 1 is characterized in that: described content to the used liquid caustic soda of raw ramie sex change is 50～55g/L, and the content of soda ash is 60～65g/L.

4. chemical degumming technique for pineapple leaf fiber according to claim 1 is characterized in that: described content to the used hydrogen peroxide of raw ramie delignification is 8～10g/L, and the content of liquid caustic soda is 3.5～4.5g/L.

5. chemical degumming technique for pineapple leaf fiber according to claim 1 is characterized in that: described oil emulsion content is 0.9～1.2% of fibrillation weight.

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