Method for modifying cellulosic fibers by using quinoa protein finishing agent

Abstract

The invention discloses a method for modifying cellulosic fibers by using a quinoa protein finishing agent, and relates to the technical field of preparation of quinoa protein finishing agents, the preparation method comprises the following steps: extraction of quinoa protein liquid: extracting protein from quinoa by physical and chemical methods to obtain the quinoa protein liquid; performing modification treatment on the quinoa protein liquid: performing cross-linking modification on the quinoa protein liquid by using polyvinyl alcohol, wherein the mass ratio of the polyvinyl alcohol to the quinoa protein liquid is 0.02: 1 to 0.12: 1; spinning by a wet spinning-stretching method: mixing the modified quinoa protein solution with a cellulose fiber solution, and spinning by adopting the wet spinning-stretching method to form nascent filaments; post-treatment: performing acid pickling, desulfurization, water washing, oiling, dehydration and drying on the nascent filaments to obtain the quinoa protein cellulose fibers. According to the method for modifying the cellulosic fibers by utilizing the quinoa protein finishing agent, the problem that quinoa protein is difficult to combine with the cellulosic fibers in the prior art is solved, and an environment-friendly and efficient fiber modification scheme is provided.

Description

Technical Field

[0001] The invention relates to the technical field of functional cellulose fiber modification, in particular to a method for modifying cellulose fiber by using a quinoa protein finishing agent. Background Art

[0002] Quinoa protein has attracted much attention in the field of food science due to its unique composition and biological activity. Quinoa protein is mainly composed of two types of proteins: albumin and globulin. Among these components, 11S globulin, especially a globulin called chenopodin, accounts for 37% of the total protein content of quinoa. At the same time, 2S albumin also accounts for a considerable proportion, about 35%. These protein molecules are connected to each other by disulfide bonds, forming a stable structure. Quinoa has a rich protein content of between 14% and 22%, which is comparable to the protein content of beef and exceeds the protein content in milk, which is only about 5%. In addition to the high protein content, quinoa protein also contains bioactive components, such as antimicrobial peptides (AMPs), which may help enhance the body's immune function. Quinoa protein is not only high in nutritional value, but also has a variety of functional properties, including good emulsification, foaming and gelling properties. The balanced amino acid composition and comprehensive nutritional properties of quinoa protein make it an important source of protein supplementation in the food industry, increasing the diversity of protein sources and improving the nutritional value of food.

[0003] Regenerated cellulose fiber is a textile fiber obtained by chemical and physical processing of natural cellulose. The raw materials of this fiber mainly rely on abundant renewable resources in nature, including cotton, hemp, bamboo and trees. Compared with traditional cellulose fibers, new regenerated cellulose fibers show higher degree of polymerization and crystallinity, which gives them better mechanical properties, especially in tensile strength and elongation. Modification technology is widely used in its production process, and the modification methods are mainly divided into three categories: physical modification, chemical modification and biological modification. Among them, chemical modification has become the most important modification method due to its significant effect. Chemical modification includes various types of reactions, such as esterification, sulfonation, etherification, ether esterification, cross-linking and graft copolymerization. These reactions are all carried out on the hydroxyl groups in the cellulose molecular structure in order to change its chemical properties and physical properties, so as to meet the needs of a wider range of industrial applications.

[0004] There is no relevant technical report on adding quinoa protein to regenerated cellulose fiber to obtain green textile raw materials through compounding.

[0005] Therefore, in view of this, the existing structure and defects are studied and improved, and a method for modifying cellulose fibers using quinoa protein finishing agent is proposed. Summary of the invention

[0006] In view of the deficiencies in the prior art, the present invention provides a method for modifying cellulose fibers using a quinoa protein finishing agent, which solves the problems raised in the above-mentioned background technology.

[0007] To achieve the above objectives, the present invention is implemented by the following technical scheme: a method for modifying cellulose fiber using quinoa protein finishing agent, the preparation method of which comprises the following steps: Extraction of quinoa protein liquid: extract protein from quinoa by physical and chemical methods to obtain quinoa protein liquid; Modification of quinoa protein liquid: using polyvinyl alcohol to cross-link and modify the quinoa protein liquid, the mass ratio of PVA to quinoa protein liquid is 0.02:1 to 0.12:1; Wet spinning-stretching method spinning: the modified quinoa protein solution is mixed with the cellulose fiber solution, and the wet spinning-stretching method is used for spinning to form primary filaments; Post-treatment: the primary silk strips are acid-washed, desulfurized, washed, oiled, dehydrated and dried to obtain quinoa protein cellulose fibers.

[0008] Furthermore, in the extraction step of the quinoa protein solution, ethanol was used as a grinding solvent, the ratio of quinoa to ethanol was 1:6, and different amounts of polyvinylpyrrolidone (PVP) and glycidyl methacrylate (GMA) were added to the modified quinoa protein.

[0009] Furthermore, in the enzymatic hydrolysis step, the amount of alkaline protease added was 8% of the quinoa protein slurry, the reaction temperature was 30-35° C., and the reaction time was 2 hours.

[0010] Furthermore, in the wet spinning-stretching spinning step, the sodium sulfate concentration in the coagulation bath is 200-320 g / L, the sulfuric acid concentration is 60-120 g / L, the zinc sulfate concentration is 5-50 g / L, the auxiliary agent concentration is 2-30 g / L, the specific gravity is 1.15-1.46, and the temperature is 45-65°C.

[0011] Furthermore, the modified quinoa protein liquid is first subjected to a cross-linking reaction with polyvinyl alcohol to obtain a quinoa protein cross-linked liquid.

[0012] Furthermore, the quinoa protein cross-linked liquid and the viscose spinning liquid are respectively degassed once, and the quinoa protein cross-linked liquid after the first degassed is mixed with the viscose spinning liquid and then degassed for a second time.

[0013] Furthermore, the quinoa protein cross-linking liquid and viscose are wet-spun using a two-bath method to form a thin flow of viscose.

[0014] Furthermore, the viscose stream is treated with a coagulation bath, and the primary filaments are stretched while finally completing the decomposition and regeneration process, fixing the quinoa protein on the cellulose surface to form a stable skin-core structure.

[0015] Furthermore, quinoa protein viscose fiber is obtained after acid washing, desulfurization, water washing, acid washing, water washing, oiling, dehydration and drying.

[0016] Furthermore, the fiber has a protein content of 15%-25% and a breaking strength of 2.2-2.5 cN / dte The present invention provides a method for modifying cellulose fibers using a quinoa protein finishing agent, which has the following beneficial effects: 1. The method for modifying cellulose fiber using quinoa protein finishing agent uses quinoa protein liquid modified by polyvinyl pyrrolidone and glycidyl methacrylate to increase viscosity and provide cross-linking effect. The extracted quinoa protein liquid has good binding property with cellulose fiber, ensuring high protein content and high breaking strength. The content and purity of the extracted quinoa protein liquid, combined with dispersion and cross-linking reaction, have good binding property with cellulose fiber, and both protein content and breaking strength are high.

[0017] 2. The method of modifying cellulose fiber using quinoa protein finishing agent uses polyvinyl alcohol for additional cross-linking modification before spinning, and performs two degassing steps to obtain high-quality quinoa protein fiber. The obtained quinoa protein fiber has the characteristics of high protein content and good fiber breaking strength. Through these innovative steps, not only the physical properties of quinoa protein fiber are improved, but also its functionality is enhanced, providing a new type of high-performance fiber material for the textile industry. DETAILED DESCRIPTION

[0018] The following examples are used to illustrate the present invention, but they are not intended to limit the scope of the present invention. Example

[0019] A method for preparing quinoa protein fiber comprises the following steps: Preparation of modified quinoa protein liquid: Quinoa protein powder modified by polyvinyl pyrrolidone and glycidyl methacrylate is prepared into quinoa protein liquid.

[0020] Cross-linking modification of quinoa protein solution: 5% polyvinyl alcohol (PVA) solution is added to the quinoa protein solution through a metering device in a slow and controlled manner. The mass ratio of PVA solution to quinoa protein solution is precisely controlled to be 0.06:1. Subsequently, the mixed solution is uniformly stirred with a stirrer so that PVA and quinoa protein fully react to form a uniform cross-linked network structure. The modified quinoa protein solution and viscose spinning solution are respectively subjected to the initial degassing treatment to remove the bubbles that may exist in the mixed solution in preparation for the next step of mixing. The quinoa protein solution and the viscose spinning solution after the initial degassing are accurately transported to the pre-spinning process by a metering pump and a supply system in a predetermined ratio for static mixing. The quinoa protein solution and the viscose spinning solution after static mixing are degassed again to ensure the purity and stability of the mixed solution, and the volume ratio of the quinoa protein solution to the viscose solution is strictly controlled at 28%.

[0021] Spinning: Wet spinning-stretching method is used. The viscose solution that has been thoroughly degassed and contains quinoa protein is introduced into the spinning machine through a dedicated glue supply pipeline. The viscose solution is accurately metered by a metering pump to ensure the consistency and repeatability of the liquid flow during the spinning process. During the transportation process, the viscose solution passes through the candle filter again to remove any possible residual particle impurities to ensure the purity of the spinning solution. The filtered viscose solution continues to pass through the curved tube, which is part of the spinning machine. Its design helps to further stabilize the liquid flow and guide it to the spinneret assembly. The viscose solution passes through the numerous spinneret holes in the spinneret assembly under pressure to form a fine viscose stream.

[0022] Curing and stretching: After the viscose stream passes through the spinneret, it first enters a coagulation bath containing a specific concentration of chemicals. The coagulation bath contains 280g / L sodium sulfate, 90g / L sulfuric acid, 25g / L zinc sulfate, and 10g / L additives. The specific gravity of the coagulation bath is controlled at 1.27 and kept at 50°C. These conditions provide an ideal environment for the curing of the viscose stream. In the coagulation bath, the viscose stream quickly solidifies and forms primary filaments. This step is a key stage in fiber formation and determines the initial physical structure of the fiber. The primary filaments are collected by the godet and bundled for subsequent stretching and curing processes. The bundled primary filaments undergo a stretching mechanism, which not only further refines the fiber but also helps to improve its mechanical properties. While stretching, the primary filaments complete the decomposition and regeneration process in the curing bath. This step has a decisive influence on the final performance and structure of the fiber. In the curing bath, the silkworm pupa protein is effectively fixed on the surface of the cellulose fiber through chemical and physical effects, forming a stable skin-core structure.

[0023] Step 5: Post-treatment: The fiber bundles are cut into certain specifications, and then subjected to acid washing, desulfurization, water washing, secondary acid washing, secondary water washing, oiling, dehydration, and drying to obtain quinoa protein viscose fiber. Example

[0024] A method for preparing quinoa protein fiber comprises the following steps: Preparation of modified quinoa protein liquid: Quinoa protein powder modified by polyvinyl pyrrolidone and glycidyl methacrylate is prepared into quinoa protein liquid.

[0025] Cross-linking modification of quinoa protein solution: 2% polyvinyl alcohol solution is slowly added to quinoa protein solution through a metering device, and the mass ratio of polyvinyl alcohol solution to quinoa protein solution is 0.08:1, respectively, and mixed evenly with a stirrer. The mixed quinoa protein solution and viscose spinning solution are degassed once, and then transported to the pre-spinning process by a metering pump and a supply system in proportion for static mixing, and then degassed again. The volume ratio of quinoa protein solution to viscose solution is 16%.

[0026] Spinning: Wet spinning-stretching method is used. The viscose solution that has been thoroughly degassed and contains quinoa protein is introduced into the spinning machine through a dedicated glue supply pipeline. The viscose solution is accurately metered by a metering pump to ensure the consistency and repeatability of the liquid flow during the spinning process. During the transportation process, the viscose solution passes through the candle filter again to remove any possible residual particle impurities to ensure the purity of the spinning solution. The filtered viscose solution continues to pass through the curved tube, which is part of the spinning machine. Its design helps to further stabilize the liquid flow and guide it to the spinneret assembly. The viscose solution passes through the numerous spinneret holes in the spinneret assembly under pressure to form a fine viscose stream.

[0027] Curing and stretching: After the viscose stream passes through the spinneret, it first enters a coagulation bath containing a specific concentration of chemicals. The coagulation bath contains 230 grams per liter (g / L) of sodium sulfate, 90g / L of sulfuric acid, 16g / L of zinc sulfate, and 6g / L of additives. The specific gravity of the coagulation bath is controlled at 1.15 and the temperature is maintained at 50°C. These conditions provide an ideal environment for the curing of the viscose stream. In the coagulation bath, the viscose stream quickly solidifies and forms primary filaments. This step is a key stage in fiber formation and determines the initial physical structure of the fiber. The primary filaments are collected by the godet and bundled for subsequent stretching and curing processes. The bundled primary filaments undergo a stretching mechanism, which not only further refines the fiber but also helps to improve its mechanical properties. While stretching, the primary filaments complete the decomposition and regeneration process in the curing bath. This step has a decisive influence on the final performance and structure of the fiber. In the curing bath, the silkworm pupa protein is effectively fixed on the surface of the cellulose fiber through chemical and physical effects, forming a stable skin-core structure.

[0028] Post-treatment: the fiber bundles are cut into certain specifications, and then subjected to acid washing, desulfurization, water washing, secondary acid washing, secondary water washing, oiling, dehydration and drying to obtain quinoa protein viscose fiber.

[0029] Comparative Example 1 The difference between this embodiment and embodiment 1 is that the addition amount of the 3% polyvinyl alcohol solution is 5% of the quinoa protein solution.

[0030] Comparative Example 2 The difference between this embodiment and embodiment 1 is that the addition amount of the 2% polyvinyl alcohol solution is 10% of the quinoa protein solution.

[0031] Comparative Example 3 The difference between this embodiment and embodiment 1 is that no polyvinyl alcohol solution is added to the quinoa protein liquid after the primary modification for secondary cross-linking modification.

[0032] Comparative Example 4 The difference between this embodiment and embodiment 1 is that degassing is performed only once after the quinoa protein is mixed with the viscose spinning solution.

[0033] The protein content and fiber breaking strength of the above examples and comparative examples were tested, and the test results are shown in the following table.

[0034]

[0035] The embodiments of the present invention are given for the purpose of illustration and description, and are not intended to be exhaustive or to limit the invention to the disclosed forms. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiments are selected and described in order to better illustrate the principles and practical applications of the present invention and to enable those of ordinary skill in the art to understand the present invention and thereby design various embodiments with various modifications suitable for specific uses.

Claims

1. A method for modifying cellulose fibers using a quinoa protein finishing agent, characterized in that: The preparation method comprises the following steps: Extraction of quinoa protein liquid: extract protein from quinoa by physical and chemical methods to obtain quinoa protein liquid; Modification of quinoa protein liquid: using polyvinyl alcohol to cross-link and modify the quinoa protein liquid, the mass ratio of PVA to quinoa protein liquid is 0.02:1 to 0.12:1; Wet spinning-stretching method spinning: the modified quinoa protein solution is mixed with the cellulose fiber solution, and the wet spinning-stretching method is used for spinning to form primary filaments; Post-treatment: acid washing, desulfurization, water washing, oiling, dehydration and drying the primary silk strips to obtain quinoa protein cellulose fibers; In the extraction step of quinoa protein solution, ethanol was used as the grinding solvent, the ratio of quinoa to ethanol was 1:6, and different amounts of polyvinyl pyrrolidone (PVP) and glycidyl methacrylate (GMA) were added to the modified quinoa protein.

2. The method for modifying cellulose fiber using a quinoa protein finishing agent according to claim 1, characterized in that: In the enzymatic hydrolysis step, the amount of alkaline protease added was 8% of the quinoa protein slurry, the reaction temperature was 30-35°C, and the reaction time was 2 hours.

3. The method for modifying cellulose fiber using a quinoa protein finishing agent according to claim 1, characterized in that: In the wet spinning-stretching spinning step, the sodium sulfate concentration in the coagulation bath is 200-320 g / L, the sulfuric acid concentration is 60-120 g / L, the zinc sulfate concentration is 5-50 g / L, the auxiliary agent concentration is 2-30 g / L, the specific gravity is 1.15-1.46, and the temperature is 45-65°C.

4. The method for modifying cellulose fiber using a quinoa protein finishing agent according to claim 1, characterized in that: Firstly, the modified quinoa protein liquid is subjected to a cross-linking reaction with polyvinyl alcohol to obtain a quinoa protein cross-linking liquid.

5. The method for modifying cellulose fiber using a quinoa protein finishing agent according to claim 4, characterized in that: The quinoa protein cross-linking liquid and the viscose spinning liquid are respectively degassed once, and the quinoa protein cross-linking liquid after the first degashing is mixed with the viscose spinning liquid and then degassed twice.

6. The method for modifying cellulose fiber using quinoa protein finishing agent according to claim 5, characterized in that: The quinoa protein cross-linking liquid and viscose are wet-spun by a two-bath method to form a thin flow of viscose.

7. The method for modifying cellulose fiber using quinoa protein finishing agent according to claim 6, characterized in that: The viscose stream is treated with a coagulation bath, and the primary filaments are stretched while completing the decomposition and regeneration process, fixing the quinoa protein on the cellulose surface to form a stable skin-core structure.

8. The method for modifying cellulose fiber using quinoa protein finishing agent according to claim 1, characterized in that: The quinoa protein viscose fiber is obtained after acid washing, desulfurization, water washing, acid washing, water washing, oiling, dehydration and drying.

9. The method for modifying cellulose fiber using a quinoa protein finishing agent according to claim 1, characterized in that: The fiber has a protein content of 15%-25% and a breaking strength of 2.2-2.5 cN / dte.

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