METHOD FOR PREPARING SALT-RESISTANT AND DETERGENT-RESISTANT ALGINATE FIBER

Abstract

A method for preparing a salt-resistant and detergent-resistant alginate fiber by contacting and infiltrating a finished alginate fiber with a borate-containing adjuvant solution and using selected proper raw materials in selected proportions and reaction conditions. The preparation method solves the problem that the alginate fiber and a fabric made therefrom are neither salt-resistant nor detergent-resistant. The borate-modified alginate fiber and a fabric made therefrom have excellent salt resistances, and can be washed with an alkaline detergent. The swelling degree of the alginate fiber modified by the adjuvant solution can be reduced to 39.8% after the fiber is immersed in a normal saline at 30 C. for 72 h and can be reduced to 55.3% after the fiber is immersed in a standard detergent for 24 h, while the fiber maintains its original morphology without any obvious dissolution phenomenon, and the self flame-resisting performance of the alginate fiber is also maintained.

Claims

1. A method for preparing a salt-resistant and detergent-resistant alginate fiber, wherein the fiber is obtained by contacting and infiltrating an alginate fiber with an adjuvant solution for 1-300 minutes, washing after the infiltration is completed, and then drying; the adjuvant solution is prepared by dissolving a combination of one or more of boric acid, borate, tetraborate, pentaborate, metaborate or perborate in water; the mass fraction of the adjuvant in the adjuvant solution is 0.1-8%, the alginate fiber is contacted with and infiltrated in the adjuvant solution at a temperature of 10-70 C. for a time period of 1-300 minutes, and the pH value of the adjuvant solution is 8-11; and the mass ratio of the alginate fiber to the adjuvant is 3-100:1.

2. The method for preparing a salt-resistant and detergent-resistant alginate fiber of claim 1, wherein the adjuvant solution comprises one or more of boric acid, borate, tetraborate, pentaborate or metaborate; the mass fraction of the adjuvant in the adjuvant solution is 0.3-6%, the alginate fiber is contacted with and infiltrated in the adjuvant solution at a temperature of 40-70 C.; and the mass ratio of the alginate fiber to the adjuvant is 3-50:1.

3. The method for preparing a salt-resistant and detergent-resistant alginate fiber of claim 2, wherein the adjuvant solution comprises one or more of potassium tetraborate, sodium metaborate, boric acid or pentaborate; the mass fraction of the adjuvant in the adjuvant solution is 0.3-4%; the alginate fiber is contacted with and infiltrated in the adjuvant solution at a temperature of 50-55 C.; and the mass ratio of the alginate fiber to the adjuvant is 20-50:1.

4. The method for preparing a salt-resistant and detergent-resistant alginate fiber of claim 1, wherein the alginate fiber is a finished alginate fiber, or a semi-finished alginate fiber after the fiber is removed from a coagulating bath and before the fiber is coated by a glazing agent, or a fabric containing the alginate fiber, wherein the alginate fiber is a calcium alginate fiber, a zinc alginate fiber, a lead alginate fiber, a copper alginate fiber or an aluminum alginate fiber.

5. The method for preparing a salt-resistant and detergent-resistant alginate fiber of claim 1, wherein the pH value of the adjuvant solution is adjusted by using sodium hydroxide, potassium hydroxide, ammonium hydroxide, sodium carbonate, potassium carbonate, sodium bicarbonate or potassium bicarbonate as a conditioning agent.

Description

DETAILED DESCRIPTION

[0018] The invention provides a method for preparing a salt-resistant and detergent-resistant alginate fiber, and in order to make advantages and technical solutions of the invention clearer and more apparent, the invention is further described hereafter in connection with specific examples.

[0019] In the following examples 1-7, the alginate fiber modified by infiltration in an adjuvant was tested for the salt resistance of the alginate fiber according to the swelling-degree variations of the fiber after being immersed in a 30% (o.w.f) NaCl solution with a mass fraction of 0.9% at 30 C. for 72 h, with reference to GB/T8629-2001 and GB/T 3921-2008 standards;

the alginate fiber was tested for its detergent resistance according to the swelling-degree variations of the fiber after being immersed in a 30% (o.w.f) standard detergent solution (a AATCC1993 standard detergent, a non-phosphorus ECE standard detergent, a non-phosphorus IEC standard detergent, and a soap flake specific to fabric test) at 20 C. for 24 h, and the swelling-degree variations of a cotton fiber and a polyester fiber under the same conditions are used for comparison with that of the alginate fiber; and
a knitted fabric made of the calcium alginate fiber (50% of alginate fiber, 50% of cotton, and unsized) was modified, and the modified alginate-fiber knitted fabric was immersed in a solution with the aforementioned conditions, and with reference to GB/T3917.2-1997 Textilestear properties of fabricsPart 2: determination of tear force of tongue shaped test specimens, a trouser shaped test specimen is tested on a YG(B)026H-250 type fabric strength tester for determination of tear forces of the alginate-fiber knitted fabric before and after the immersion.

Example 1

[0020] (1) Preparation of Boric-Acid Immersion Solution when the Boric Acid Solution (Immersion Solution) was Selected as the Adjuvant

[0021] 8 g of boric acid was dissolved in deionized water to formulate a 400 g immersion solution, and heated to 70 C., and the pH value of the solution was adjusted to 8 by adding Na.sub.2CO.sub.3;

(2) Preparation of Boric-Acid-Modified Alginate Fiber

[0022] 40 g of calcium alginate fiber was immersed into the boric-acid immersion solution obtained by step (1) for 10 minutes, and then the immersed alginate fiber was washed with deionized water, and dried to obtain a boric-acid-modified alginate fiber.

[0023] Table 1 is a collection of fiber swelling-degree data for the modified alginate fiber prepared in this example.

TABLE-US-00001 TABLE 1 Pure Alginate Boric-Acid-Modified Cotton Polyester Specimen Fiber Alginate Fiber Comparison Fiber Fiber NaCl Solution 373.4% 45.8% 87.7% 54.1% 51.7% AATCC1993 Standard 76.1% 62.6% 69.8% Detergent Non-Phosphorus ECE 63.2% 60.5% 65.1% Standard Detergent Non-Phosphorus IEC 64.7% 61.2% 64.8% Standard Detergent Soap Flake Specific to 83.6% 62.8% 70.4% Fabric Test *: represents being dissolved, with the same meaning in the following tables.

Example 2

[0024] (1) Preparation of Sodium-Tetraborate Immersion Solution when the Sodium Tetraborate Solution (Immersion Solution) was Selected as the Adjuvant

[0025] 0.5 g of sodium tetraborate was dissolved in deionized water to formulate a 500 g immersion solution, and heated to 50 C., and the pH value of the solution was adjusted to 10 by adding NaOH;

(2) Preparation of Sodium-Tetraborate-Modified Alginate Fiber

[0026] 50 g of lead alginate fiber was immersed into the sodium-tetraborate immersion solution obtained by step (1) for 300 minutes, and then the immersed alginate fiber was washed with deionized water, and dried to obtain a sodium-tetraborate-modified alginate fiber with the swelling-degree test data as shown in table 2.

TABLE-US-00002 TABLE 2 Pure Alginate Sodium-Tetraborate-Modified Cotton Polyester Specimen Fiber Alginate Fiber Comparison Fiber Fiber NaCl Solution 373.4% 102.7% 70.4% 54.1% 51.7% AATCC1993 Standard 126.5% 62.6% 69.8% Detergent Non-Phosphorus ECE 115.4% 60.5% 65.1% Standard Detergent Non-Phosphorus IEC 113.0% 61.2% 64.8% Standard Detergent Soap Flake Specific to 136.1% 62.8% 70.4% Fabric Test

Example 3

[0027] (1) Preparation of Ammonium-Pentaborate Immersion Solution when the Ammonium Pentaborate Solution (Immersion Solution) was Selected as the Adjuvant Solution:

[0028] 1 kg of ammonium pentaborate was dissolved in deionized water to formulate a 35 kg immersion solution, and heated to 60 C., and the pH value of the solution was adjusted to 9 by adding ammonium hydroxide;

(2) Preparation of Ammonium-Pentaborate-Modified Alginate Fiber

[0029] 5 kg of zinc alginate fiber was immersed into the ammonium-pentaborate immersion solution obtained by step (1) for 20 minutes, and then the immersed alginate fiber was washed with deionized water, and dried to obtain an ammonium-pentaborate-modified alginate fiber with the swelling-degree test data as shown in table 3.

TABLE-US-00003 TABLE 3 Pure Alginate Ammonium-Pentaborate-Modified Cotton Polyester Specimen Fiber Alginate Fiber Comparison Fiber Fiber NaCl Solution 373.4% 75.5% 89.0% 54.1% 51.7% AATCC1993 Standard 92.3% 62.6% 69.8% Detergent Non-Phosphorus ECE 87.1% 60.5% 65.1% Standard Detergent Non-Phosphorus IEC 86.5% 61.2% 64.8% Standard Detergent Soap Flake Specific to 104.8% 62.8% 70.4% Fabric Test

Example 4

[0030] (1) Preparation of Composite Immersion Solution when a Composite Solution (Immersion Solution) of a Combination of Potassium Tetraborate, Sodium Metaborate and Boric Acid Dissolved in Water was Selected as the Adjuvant Solution:

[0031] 10 g of potassium tetraborate, 5 g of sodium metaborate and 5 g of boric acid were dissolved in deionized water to formulate a 500 g immersion solution, and heated to 50 C., and the pH value of the solution was adjusted to 10 by adding KOH;

(2) Preparation of Modified Composite Alginate Fiber

[0032] 200 g of zinc alginate fiber was immersed into the composite immersion solution obtained by step (1) for 10 minutes, and then the immersed alginate fiber was washed with deionized water, and dried to obtain a modified composite alginate fiber with the swelling-degree test data as shown in table 4.

TABLE-US-00004 TABLE 4 Pure Alginate modified composite Cotton Polyester Specimen Fiber Alginate Fiber Comparison Fiber Fiber NaCl Solution 373.4% 39.8% 89.0% 54.1% 51.7% AATCC1993 Standard 68.4% 62.6% 69.8% Detergent Non-Phosphorus ECE 57.8% 60.5% 65.1% Standard Detergent Non-Phosphorus IEC 55.3% 61.2% 64.8% Standard Detergent Soap Flake Specific to 70.6% 62.8% 70.4% Fabric Test

Example 5

[0033] (1) Preparation of Potassium-Metaborate Immersion Solution when the Potassium Metaborate Solution (Immersion Solution) was Selected as the Adjuvant Solution:

[0034] 60 g of potassium metaborate was dissolved in deionized water to formulate a 1 kg immersion solution, and heated to 40 C., and the pH value of the solution was adjusted to 11 by adding KHCO.sub.3;

(2) Preparation of Potassium-Metaborate-Modified Alginate Fiber

[0035] 180 g of copper alginate fiber was immersed into the potassium-metaborate immersion solution obtained by step (1) for 1 minute, and then the immersed alginate fiber was washed with deionized water, and dried to obtain a potassium-metaborate-modified alginate fiber with the swelling-degree test data as shown in table 5.

TABLE-US-00005 TABLE 5 Pure Alginate Potassium-Metaborate-Modified Cotton Polyester Specimen Fiber Alginate Fiber Comparison Fiber Fiber NaCl Solution 373.4% 61.9% 82.5% 54.1% 51.7% AATCC1993 Standard 88.3% 62.6% 69.8% Detergent Non-Phosphorus ECE 72.5% 60.5% 65.1% Standard Detergent Non-Phosphorus IEC 71.7% 61.2% 64.8% Standard Detergent Soap Flake Specific to 95.9% 62.8% 70.4% Fabric Test

Example 6

[0036] (1) Preparation of Sodium-Perborate Immersion Solution when the Sodium Perborate Solution (Immersion Solution) was Selected as the Adjuvant Solution:

[0037] 16 g of sodium perborate was dissolved in deionized water to formulate a 200 g immersion solution, and heated to 70 C., and the pH value of the solution was adjusted to 10 by adding ammonium hydroxide;

(2) Preparation of Sodium-Perborate-Modified Alginate Fiber

[0038] 80 g of aluminum alginate fiber was immersed into the sodium-perborate immersion solution obtained by step (1) for 20 minutes, and then the immersed alginate fiber was washed with deionized water, and dried to obtain a sodium-perborate-modified alginate fiber with the swelling-degree test data as shown in table 6.

TABLE-US-00006 TABLE 6 Pure Alginate Sodium-Perborate-Modified Cotton Polyester Specimen Fiber Alginate Fiber Comparison Fiber Fiber NaCl Solution 373.4% 68.3% 35.2% 54.1% 51.7% AATCC1993 Standard 94.5% 62.6% 69.8% Detergent Non-Phosphorus ECE 81.8% 60.5% 65.1% Standard Detergent Non-Phosphorus IEC 79.0% 61.2% 64.8% Standard Detergent Soap Flake Specific to 99.6% 62.8% 70.4% Fabric Test

Example 7

[0039] (1) The Adjuvant Solution is Selected as being Prepared from a Mixture of Sodium Tetraborate, Sodium Metaborate and Boric Acid, and the Particular Preparation Method is as Follows:

[0040] 25 g of potassium tetraborate, 15 g of sodium metaborate and 10 g of boric acid were dissolved in deionized water to formulate a 1 kg immersion solution, and heated to 40 C., and the pH value of the solution was adjusted to 10 by adding NaOH;

(2) Preparation of Composite Modified Fabric Made of Alginate Fiber

[0041] A 200 g knitted fabric made of calcium alginate fiber was immersed into the composite immersion solution obtained by step (1) for 10 minutes, and then the immersed alginate fiber was washed with deionized water, and dried to obtain a modified composite fabric made of alginate fiber. Tear-force data of the knitted fabric is as shown in table 7.

TABLE-US-00007 TABLE 7 Knitted Fabric Made of Pure Knitted Fabric Made of Modified Alginate Fiber, N/mm Composite Alginate Fiber, N/mm Before After Before After Specimen Immersing Immersing Comparison Immersing Immersing Comparison NaCl Solution 21.3 15.2 28.6% 21.8 20.9 4.1% AATCC1993 21.3 13.9 34.7% 21.8 19.8 9.2% Standard Detergent Non-Phosphorus 21.3 14.5 31.9% 21.8 20.3 6.9% ECE Standard Detergent Non-Phosphorus 21.3 14.7 31.0% 21.8 203 6.9% IEC Standard Detergent Soap Flake 21.3 13.1 38.5% 21.8 19.4 11.0% Specific to Fabric Test

Example 8

[0042] (1) The Adjuvant Solution is Selected as being Prepared from a Mixture of Sodium Tetraborate, Ammonium Pentaborate and Boric Acid, and the Particular Preparation Method is as Follows:

[0043] 5 g of potassium tetraborate, 5 g of ammonium pentaborate and 5 g of boric acid were dissolved in deionized water to formulate a 5 kg immersion solution, and heated to 55 C., and the pH value of the solution was adjusted to 9.5 by adding NaOH;

(2) Preparation of Composite Modified Fabric Made of Alginate Fiber

[0044] A 750 g knitted fabric made of calcium alginate fiber was immersed into the composite immersion solution obtained by step (1) for 180 minutes, and then the immersed alginate fiber was washed with deionized water, and dried to obtain a modified composite fabric made of alginate fiber. Tear-force data of the knitted fabric is as shown in table 8.

TABLE-US-00008 TABLE 8 Knitted Fabric Made of Pure Knitted Fabric Made of Modified Alginate Fiber, N/mm Composite Alginate Fiber, N/mm Before After Before After Specimen Immersing Immersing Comparison Immersing Immersing Comparison NaCl Solution 21.3 15.2 28.6% 22.6 22.0 2.7% AATCC1993 21.3 13.9 34.7% 22.6 21.2 6.2% Standard Detergent Non-Phosphorus 25.3 14.5 31.9% 22.6 21.8 3.5% ECE Standard Detergent Non-Phosphorus 21.3 14.7 31.0% 22.6 21.7 4.0% IEC Standard Detergent Soap Flake 21.3 13.1 38.5% 22.6 20.5 9.3% Specific to Fabric Test

Example 9

[0045] (1) Preparation of Ammonium-Pentaborate Immersion Solution when the Ammonium Pentaborate Solution (Immersion Solution) was Selected as the Adjuvant Solution:

[0046] 5 g of ammonium pentaborate was dissolved in deionized water to formulate a 2 kg composite immersion solution, and heated to 45 C., and the pH value of the solution was adjusted to 9 by adding ammonium hydroxide;

(2) Preparation of Composite Modified Fabric Made of Alginate Fiber

[0047] A 400 g knitted fabric made of calcium alginate fiber was immersed into the composite immersion solution obtained by step (1) for 240 minutes, and then the immersed alginate fiber was washed with deionized water, and dried to obtain a modified composite fabric made of alginate fiber. Tear-force data of the knitted fabric is as shown in table 9.

TABLE-US-00009 TABLE 9 Knitted Fabric Made of Pure Knitted Fabric Made of Modified Alginate Fiber, N/mm Composite Alginate Fiber, N/mm Before After Before After Specimen Immersing Immersing Comparison Immersing Immersing Comparison NaCl Solution 21.3 15.2 28.6% 22.1 21.1 4.4% AATCC1993 21.3 13.9 34.7% 22.1 20.3 8.0% Standard Detergent Non-Phosphorus 21.3 14.5 31.9% 22.1 20.9 5.3% ECE Standard Detergent Non-Phosphorus 21.3 14.7 31.0% 22.1 20.9 5.3% IEC Standard Detergent Soap Flake 21.3 13.1 38.5% 22.1 19.7 10.6% Specific to Fabric Test