Preparation method of high moisture absorption and quick drying modified composite cotton cloth

Abstract

This invention relates to the field of modified fiber technology, specifically a method for preparing a highly absorbent and quick-drying modified composite cotton fabric: Disordered cotton fibers are dispersed and placed in a constant-temperature dilute alkaline solution, stirred, and then washed with deionized water until neutral; an activator is added to the cotton fibers, and the mixture is heated and stirred to react; the reacted cotton fibers are filtered and added to deionized water, stirred evenly, and then a terminal amino compound and a catalyst are added, and the mixture is heated and stirred continuously to react; the reactants are diluted with deionized water, ultrasonically vibrated, dried, and spun into fabric. This invention first activates the cotton fibers, fully exposing the hydroxyl groups, and then performs a grafting reaction with the terminal amino compound. The grafted terminal amino compound can block and deactivate the hydroxyl groups, preventing them from forming hydrogen bonds with water molecules and locking in water. This significantly reduces the water absorption and water retention properties of the cotton fibers, giving them the characteristic of quick-drying after washing.

Description

Technical Field

[0001] This invention relates to the field of modified fiber technology, and in particular to a method for preparing a highly absorbent and quick-drying modified composite cotton fabric. Background Technology

[0002] Because ordinary cotton contains a large number of hydrophilic hydroxyl groups in its molecular structure, these hydroxyl groups form hydrogen bonds with water molecules upon contact with water, locking the water molecules within the cotton fibers. This makes it difficult for moisture to evaporate, resulting in excellent moisture absorption but poor quick-drying properties. Modifying ordinary cotton is an effective solution to this problem. By sealing the hydroxyl groups in the cotton fibers, the hydroxyl groups cannot form hydrogen bonds with water molecules, allowing the cotton to absorb moisture fully and then quickly expel it, achieving quick-drying.

[0003] However, the existing methods of modifying cotton products by blocking hydroxyl groups require the evaporation potential of water in cotton fibers to achieve quick drying after moisture absorption. This necessitates maintaining a high humidity level in the cotton fibers and ensuring a consistently high percentage of moisture in the fibers to guarantee a continuous perspiration effect. This results in unsatisfactory perspiration performance and reduced skin comfort. Summary of the Invention

[0004] To address the above problems, this invention provides a method for preparing a highly absorbent and quick-drying modified composite cotton fabric, comprising the following steps: 1) Disperse the disordered cotton fibers and place them in a constant-temperature dilute alkaline solution. Stir and wash with deionized water until neutral. Set aside for later use. 2) Add an activator to the cotton fibers from step 1), heat and stir to react; 3) After filtering the cotton fibers from step 2), add them to deionized water, stir evenly, add the terminal amino compound and catalyst, heat and stir continuously to react; 4) Add deionized water to the reactants in step 3) to dilute, then ultrasonically vibrate and dry, and weave into fabric to obtain the final product.

[0005] Specifically, the concentration of the dilute alkaline solution is 0.05~0.5 mol / L, and it is either a sodium hydroxide solution or a potassium hydroxide solution. Using a dilute alkaline solution can fully expose the hydroxyl groups in the cotton fibers, providing sufficient reaction sites for subsequent reactions, while not damaging the main chain structure of the cotton fibers, thus ensuring the mechanical properties of the cotton fibers.

[0006] Furthermore, the activator is one of sodium hexametaphosphate, ethylenediaminetetraacetic acid, epichlorohydrin, or glycidyl ether, and the amount used is 1% to 5% of the cotton fiber mass. The activator can effectively penetrate into the cotton fiber and react with the hydroxyl groups in the cotton fiber, causing the molecular chain of the cotton fiber to break and form more active sites, providing favorable conditions for the subsequent introduction of terminal amino compounds.

[0007] Specifically, the terminal amino compound is one of ethylamine, propylamine, butylamine, low-molecular-weight PA, or low-molecular-weight PET. The terminal amino compound reacts with activated cotton fibers, firmly grafting onto the fiber surface and deactivating the hydrophilic hydroxyl groups, thus reducing the cotton fiber's water absorption capacity. Simultaneously, the introduced hydrophobic groups transport moisture from the cotton fiber to the surface, giving the cotton fiber drainage capabilities. By precisely controlling the type and amount of activator and terminal amino compound, the moisture absorption and quick-drying properties of the modified cotton can be optimized to meet the needs of different applications. The catalyst for the reaction between the terminal amino compound and the hydroxyl groups in the cotton fiber is acetic acid or tetrabutyl titanate, with a catalyst dosage of 0.1% to 1% of the cotton fiber mass. The addition of the catalyst significantly reduces the reaction temperature, shortens the reaction time, and improves the reaction efficiency. During heating and stirring, the catalyst promotes effective collisions between the terminal amino compound and the hydroxyl groups in the cotton fiber, increasing the reaction probability and accelerating the reaction. Meanwhile, the selection and dosage of catalysts also have a certain impact on the performance of modified cotton. By optimizing the type and dosage of catalysts, the moisture absorption and quick-drying properties of modified cotton can be further controlled to achieve better application results.

[0008] This invention can obtain high-performance moisture-wicking and quick-drying modified cotton by controlling the process parameters of each step. The specific process parameters are controlled as follows: the temperature of the constant-temperature dilute alkali solution in step 1) is 30~40℃; the heating temperature in step 2) is 40~60℃ and the stirring time is 1~3h; the heating temperature in step 3) is 50~70℃ and the reaction time is 6~12h.

[0009] The moisture-wicking and quick-drying modified cotton prepared by the above method in this invention is equivalent to grafting terminal amino compounds onto cotton fibers. The function of the terminal amino compounds is to seal the hydrophilic hydroxyl groups in the cotton fibers, thus depriving the cotton fibers of their water-absorbing properties. Based on this approach, this invention can be further optimized by using a crosslinking agent to crosslink the terminal amino compounds grafted onto the cotton fibers, connecting the terminal amino compounds between the cotton fibers to form a three-dimensional network structure of cotton fibers, thereby improving the mechanical properties of the cotton fibers, such as their resistance to deformation.

[0010] Specifically, after the reaction in step 3) is complete, a crosslinking agent is added to the system, and the temperature is maintained while stirring for 1-2 hours. The crosslinking agent is selected from polyfunctional compounds, such as polyethylene glycol diglycidyl ether or trimethylolpropane triglycidyl ether. These crosslinking agents can effectively crosslink the terminal amino compounds grafted onto cotton fibers, forming a stable network structure, further enhancing the deformation resistance and durability of the modified cotton. By precisely controlling the type and amount of crosslinking agent, the overall performance of the modified cotton can be optimized to meet the needs of different application scenarios.

[0011] This invention first activates cotton fibers, fully exposing the hydroxyl groups, and then performs a grafting reaction with terminal amino compounds. The grafted terminal amino compounds deactivate the hydroxyl groups, preventing them from forming hydrogen bonds with water molecules and locking in water. This significantly reduces the water absorption and retention properties of the cotton fibers, giving them the characteristic of quick-drying after washing. The moisture-wicking and quick-drying modified cotton prepared using this method can be used to make quilts. Due to its low water absorption and high water drainage properties, the prepared quilts can be directly washed. Detailed Implementation

[0012] The present invention will be described below with reference to examples. These examples are only used to explain the present invention and are not intended to limit the scope of the present invention.

[0013] Example 1 A method for preparing a highly absorbent and quick-drying modified composite cotton fabric includes the following steps: 1) After dispersing the disordered cotton fibers, place them in a 0.05 mol / L sodium hydroxide solution at 40℃, stir, and then wash with deionized water until neutral. Set aside for later use. 2) Add sodium hexametaphosphate at a weight of 3% of the cotton fiber to the cotton fiber in step 1), heat to 60°C and stir for 1 hour; 3) After filtering the cotton fibers after the reaction in step 2), add them to deionized water, stir evenly, add PA6 with a number average molecular weight of 2000 (3% by weight of cotton fibers) and tetrabutyl titanate (3% by weight of cotton fibers), heat to 70°C, and react for 6 hours while stirring. 4) Add deionized water to the reactants in step 3) to dilute, then ultrasonically vibrate and dry, and weave into fabric to obtain the final product.

[0014] Example 2 A method for preparing a highly absorbent and quick-drying modified composite cotton fabric includes the following steps: 1) After dispersing the disordered cotton fibers, place them in a 0.5 mol / L potassium hydroxide solution at 30°C, stir, and then wash with deionized water until neutral. Set aside for later use. 2) Add 1% by weight of ethylenediaminetetraacetic acid to the cotton fibers in step 1), heat to 40°C and stir for 3 hours; 3) After filtering the cotton fibers from step 2), add them to deionized water, stir evenly, then add 7% butylamine and 1% acetic acid by weight of the cotton fibers, heat to 50°C, and react for 12 hours while stirring. 4) Add deionized water to the reactants in step 3) to dilute, then ultrasonically vibrate and dry, and weave into fabric to obtain the final product.

[0015] Example 3 A method for preparing a highly absorbent and quick-drying modified composite cotton fabric includes the following steps: 1) Disperse the disordered cotton fibers and place them in a 0.25 mol / L potassium hydroxide solution at 35°C. Stir and wash with deionized water until neutral. Set aside for later use. 2) Add 3% glycidyl ether by weight of the cotton fibers to the cotton fibers in step 1), heat to 50°C and stir for 2 hours; 3) After filtering the cotton fibers from step 2), add them to deionized water and stir evenly. Then add 5% of the weight of the cotton fibers, PA56 with a number average molecular weight of 1000, and 2% of the weight of the cotton fibers, acetic acid. Heat to 60°C and react for 10 hours while stirring. Then add 30% of the weight of PA56, polyethylene glycol diglycidyl ether or trimethylolpropane triglycidyl ether, and continue stirring while maintaining the temperature for 3 hours. 4) Add deionized water to the reactants in step 3) to dilute, then ultrasonically vibrate and dry, and weave into fabric to obtain the final product.

[0016] Example 4 A method for preparing a highly absorbent and quick-drying modified composite cotton fabric includes the following steps: 1) After dispersing the disordered cotton fibers, place them in a sodium hydroxide solution or potassium hydroxide solution with a concentration of 0.05~0.5mol / L at 30~40℃, stir, and then wash with deionized water until neutral. 2) Add sodium hexametaphosphate, ethylenediaminetetraacetic acid, epichlorohydrin or glycidyl ether, accounting for 1% to 5% of the weight of the cotton fibers to the cotton fibers in step 1), heat to 40 to 60°C and stir for 1 to 3 hours. 3) After filtering the cotton fibers after the reaction in step 2), add them to deionized water and stir evenly. Then add 7% of the cotton fiber weight of PET with a number average molecular weight of 3000 and 3% of the cotton fiber weight of tetrabutyl titanate. Heat to 65°C and react for 9 hours with stirring. Then add 20% of the PET weight of trimethylolpropane triglycidyl ether and continue stirring for 1 hour while maintaining the temperature. 4) Add deionized water to the reactants in step 3) to dilute, then ultrasonically vibrate and dry, and weave into fabric to obtain the final product.

[0017] Comparative Example 1 A cotton fabric woven from untreated disordered cotton fibers from Example 1.

[0018] The cotton fibers from Examples 1-4 and Comparative Example 1 were subjected to relevant performance tests, as shown in Table 1. The data in Table 1 show that, compared to the natural cotton fiber of Comparative Example 1, the moisture-wicking and quick-drying modified cotton prepared by the method of this invention exhibits superior performance in multiple performance dimensions. Specifically, regarding the differences between Examples 1 and 2 and Examples 3 and 4, step 3) of Examples 3 and 4 involves the addition of a crosslinking agent, which further seals the free amino groups of the terminal amino compounds, forming a larger network structure. Therefore, the water absorption and retention performance is further reduced, and the shape stability of the modified composite cotton fabric is also improved to some extent. Examples 1 and 2 did not add a crosslinking agent; although the moisture-wicking and quick-drying performance of the modified cotton fibers prepared in these examples is significantly improved compared to natural cotton fibers, their shape stability is still slightly insufficient.

[0019] Table 1. Performance testing of cotton fibers in Examples 1-4 and Comparative Example 1 The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method for preparing a highly absorbent and quick-drying modified composite cotton fabric, characterized in that, Includes the following steps: 1) Disperse the disordered cotton fibers and place them in a constant-temperature dilute alkaline solution. Stir and wash with deionized water until neutral. Set aside for later use. 2) Add an activator to the cotton fibers from step 1), heat and stir to react; 3) After filtering the cotton fibers from step 2), add them to deionized water, stir evenly, add the terminal amino compound and catalyst, heat and stir continuously to react; 4) Add deionized water to the reactants in step 3) to dilute, then ultrasonically vibrate and dry, and weave into fabric to obtain the final product.

2. The method according to claim 1, characterized in that, In step 1), the concentration of the dilute alkaline solution is 0.05~0.5mol / L, and it is a sodium hydroxide solution or a potassium hydroxide solution.

3. The method according to claim 1, characterized in that, In step 2), the activator is one of sodium hexametaphosphate, ethylenediaminetetraacetic acid, epichlorohydrin, or glycidyl ether.

4. The method according to claim 1, characterized in that, In step 3), the terminal amino compound is one of ethylamine, propylamine, butylamine, low molecular weight PA, and low molecular weight PET.

5. The method according to claim 1, characterized in that, In step 3), the catalyst is acetic acid or tetrabutyl titanate.

6. The method according to claim 1, characterized in that, In step 1), the temperature of the constant-temperature dilute alkali solution is 30~40℃; in step 2), the heating temperature is 40~60℃ and the stirring time is 1~3h; in step 3), the heating temperature is 50~70℃ and the reaction time is 6~12h.

7. The method according to any one of claims 1 to 6, characterized in that, Step 3) After the reaction is complete, add the crosslinking agent to the system, maintain the temperature and continue stirring for 1-2 hours.

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