Fibrilia composite modification method with functions of improving elongation at break of fibers and endowing ammonia gas with intelligent visual detection

Abstract

The invention relates to a fibrilia composite modification method with functions of improving fiber elongation at break and endowing ammonia gas with intelligent visual detection. The fibrilia composite modification method comprises the following steps: step 1, soaking fibrilia in a high-concentration zinc chloride solution (the mass fraction of zinc chloride is 63-65%) for modification; step 2, extracting purple cabbage with water to prepare a purple cabbage extracting solution, then putting the fibrilia modified by zinc chloride into the purple cabbage extracting solution, finishing for a period of time at room temperature, taking out and drying to obtain the composite modified fibrilia. According to the modification method, the elongation at break of the jute fibers can be effectively improved, and the jute fibers are endowed with an ammonia gas visual intelligent color-changing indication function.

Description

Technical Field

[0001] This invention relates to a hemp fiber modification technology, and more specifically, to a hemp fiber composite modification method that combines improving fiber breaking elongation and providing intelligent visual detection function for ammonia. Background Technology

[0002] Hemp fiber is a natural cellulose fiber, characterized by its ruggedness, coolness, breathability, rapid moisture absorption and dissipation, and antibacterial properties. It is also renewable and biodegradable, making it a green functional fiber. While hemp fiber boasts high strength, its coarseness and low elongation at break negatively impact its performance in clothing and limit its applications.

[0003] Ammonia is a colorless, pungent, and toxic gas. High concentrations of ammonia can directly threaten human health and cause environmental pollution. Ammonia can also form explosive mixtures with air, igniting and exploding upon contact with open flames or high temperatures. Monitoring ammonia can alert to leaks, preventing harm to public health, and can also quickly indicate spoilage risks by detecting ammonia release from meat, shrimp, crab, and other products. Summary of the Invention

[0004] The technical problem this invention aims to solve is to address the above-mentioned shortcomings by providing a composite modification method for hemp fibers that simultaneously improves fiber breaking elongation and imparts intelligent visual detection functionality for ammonia. This invention's method can significantly improve the breaking elongation of hemp fibers through modification and also endows the hemp fibers with intelligent visual detection functionality for ammonia.

[0005] The technical solution of the present invention is as follows: A method for modifying hemp fibers to improve fiber breaking elongation and provide intelligent visual detection of ammonia gas includes the following steps: Step 1: Soak the hemp fiber in a high-concentration zinc chloride solution (63%-65% by mass) to modify it, and obtain zinc chloride-modified hemp fiber. Step 2: Prepare purple cabbage extract by water extraction of purple cabbage, then soak the zinc chloride modified hemp fiber in the purple cabbage extract at room temperature for a period of time, take it out and dry it to obtain the composite modified hemp fiber.

[0006] Furthermore, the soaking time in step 1 is 15-60 minutes.

[0007] Furthermore, the zinc chloride modification temperature in step 1 is 30-50℃.

[0008] Furthermore, in step 2, the preparation process of the purple cabbage extract is as follows: purple cabbage is placed in water with a solid-liquid ratio of 1:5-1:20, the extraction temperature is 50-100℃, the extraction time is 0.5-2h, and the purple cabbage extract filtrate is obtained by filtration after extraction.

[0009] Furthermore, the soaking and finishing time of the purple cabbage in step 2 is 5-30 minutes. The beneficial effects of this invention are: (1) The hemp fiber prepared by the present invention has an intelligent visual detection function for ammonia. The composite modified hemp fiber is purple and turns blue when it comes into contact with ammonia. (2) The elongation at break of the hemp fiber after composite modification in this invention is greatly improved. This is because the excess zinc ions in the high-concentration zinc chloride solution form coordinate bonds with the hydroxyl groups in cellulose, destroying the hydrogen bond network between cellulose molecules, causing the hemp fiber to swell and its crystallinity to decrease, thus making the fiber easier to elongate. The swelling and ion adsorption effects of zinc chloride also improve the hemp fiber's adsorption capacity for purple cabbage. The dyeing depth of the fiber after zinc chloride treatment is significantly higher than that after non-zinc chloride pretreatment. Detailed Implementation

[0010] The principles and features of the present invention are described below. The examples given are only for explaining the present invention and are not intended to limit the scope of the present invention.

[0011] Based on the information contained in this application, various changes to the precise description of the invention can be readily made by those skilled in the art without departing from the spirit and scope of the appended claims. It should be understood that the scope of the invention is not limited to the defined processes, properties, or components, as these embodiments and other descriptions are merely illustrative of specific aspects of the invention. In fact, various modifications to embodiments of the invention that will be apparent to those skilled in the art or related fields are covered within the scope of the appended claims.

[0012] To better understand the invention and not to limit its scope, all figures indicating amounts, percentages, and other numerical values ​​used in this application should, in all cases, be understood to be modified by the word "approximately." Therefore, unless specifically stated otherwise, the numerical parameters listed in the specification and appended claims are approximate values ​​and may vary depending on the desired properties being sought. Each numerical parameter should at least be considered as obtained based on reported significant figures and through conventional rounding methods. Example

[0013] This embodiment of a method that combines improved fiber breaking elongation and intelligent visual detection of ammonia includes the following steps: Step 1: Prepare a zinc chloride solution with a mass concentration of 63.5% by mixing 50.8g of zinc chloride and 29.2g of water. Soak the hemp fiber in the zinc chloride solution at 40℃ for 40 minutes to modify it, and then take it out.

[0014] Step 2: Weigh 20g of purple cabbage and put it into 100g of water. Extract at 90℃ for 30 minutes and then filter to obtain purple cabbage extract. Then, put the hemp fiber modified by zinc chloride in Step 1 into the purple cabbage extract and soak it at room temperature for 10 minutes. After taking it out and drying it, you can obtain composite modified hemp fiber.

[0015] Comparative Example 1: The specific process is the same as in Example 1, but the concentration of the zinc chloride solution used is 7%, which is a low-concentration zinc chloride solution.

[0016] Control group: unmodified hemp fiber.

[0017] The fiber properties of the above-mentioned hemp fibers were tested respectively. The mechanical properties of the fibers were determined according to GB5886-86, and the results are shown in Table 1 below: Table 1 sample Elongation at break (%) Example 1 9.11 Comparative Example 1 3.38 control group 3.30 As can be seen from the table, the breaking elongation of the composite-modified hemp fiber increased significantly compared to the unmodified fiber, while treatment with low-concentration zinc chloride showed little change. The composite-modified hemp fiber changed from purple to blue upon contact with ammonia gas.

[0018] The above description provides examples of the preferred embodiments of the present invention, and any parts not described in detail are common knowledge to those skilled in the art. The scope of protection of the present invention is defined by the claims.

Claims

1. A method for composite modification of hemp fibers that simultaneously improves fiber breaking elongation and imparts intelligent visual detection function for ammonia, characterized in that, Includes the following steps: Step 1: Soak the hemp fiber in a zinc chloride solution with a mass fraction of 63%-65% to modify it, and obtain zinc chloride modified hemp fiber; Step 2: Prepare purple cabbage extract by water extraction of purple cabbage, then soak the zinc chloride modified hemp fiber in the purple cabbage extract, take it out and dry it to obtain the composite modified hemp fiber.

2. The method for composite modification of hemp fibers according to claim 1, which combines improved fiber breaking elongation and intelligent visual detection of ammonia, is characterized in that, The soaking time in step 1 is 15-60 minutes.

3. The method for composite modification of hemp fibers according to claim 1, which combines improved fiber breaking elongation and intelligent visual detection function for ammonia, is characterized in that... The zinc chloride modification temperature in step 1 is 30-50℃.

4. The method for composite modification of hemp fibers according to claim 1, which combines improved fiber breaking elongation and intelligent visual detection function for ammonia, is characterized in that, In step 2, the preparation process of purple cabbage extract is as follows: purple cabbage is placed in water with a solid-liquid ratio of 1:5-1:20, the extraction temperature is 50-100℃, the extraction time is 0.5-2h, and the purple cabbage extract is obtained by filtration after extraction.

5. The method for composite modification of hemp fiber according to claim 1, which simultaneously improves fiber breaking elongation and imparts intelligent visual detection function for ammonia, is characterized in that, The soaking time for the purple cabbage in step 2 is 5-30 minutes.