Bioenzyme and chemical degumming combined pretreatment method for flax roving

Abstract

The invention belongs to the technical field of treatment of fibers, yarns, threads, fabrics, feathers or fiber products made of the fibers, the yarns, the threads, the fabrics, the feathers or other types in D06 types, and relates to a pretreatment method combining biological enzyme and chemical degumming of flax roving, which comprises the following steps: adding hydrochloric acid and chlorine into clear water according to a ratio of 36.5: 1: 1; the method comprises the following steps: peeling linen fibers, mixing clean water with hydrochloric acid and chlorine, soaking the peeled linen fibers in a mixed solution at 28-32 DEG C for 87-120h, softening the linen fibers and removing impurities in the linen fibers, and evaluating the linen roving processed by different numerical values to obtain the linen roving processed by different numerical values. The overall score of the flax roving processed in the seventh embodiment can reach 92, the manufactured flax roving is even in overall strip arrangement, soft in touch feeling and even in roving evenness, and the internal impurity rate of the flax roving is 0.5%.

Description

Technical Field

[0001] The present invention belongs to the technical field of treating fibers, yarns, threads, fabrics, feathers or fiber products made of these materials that are not included in other categories within category D06, and in particular relates to a pretreatment method for flax roving combining biological enzymes with chemical degumming. Background Art

[0002] Flax fiber is the earliest natural fiber used by humans. It is a bundled plant fiber among natural fibers. It has a natural spindle-shaped structure and unique pectin-like bevel holes, which produce excellent moisture absorption, breathability, antiseptic, antibacterial and low static electricity properties. Flax roving is usually used in the fields of hand-woven textiles, high-end clothing and home accessories. Due to its natural texture, good breathability, good moisture absorption and low static electricity, it is very suitable for use in summer or in environments with high humidity. In the field of handicrafts, flax roving is more often used for weaving, crocheting or weaving tapestries. Due to its rough textile texture and pure natural color, it can create a traditional and simple artistic effect.

[0003] Flax roving is usually pre-treated by multiple steps including raw material preparation, fiber soaking, fiber scouring, fiber bleaching, fiber drying, fiber carding, fiber combing and fiber stretching. The dried flax fiber is put into a pot and scour with high temperature water, and appropriate amount of bleach and softener are added to achieve the purpose of cleaning, bleaching and softening.

[0004] Combined with the existing technology, it is found that due to the presence of a large amount of pectin and impurities inside the flax fiber, the existing flax roving processing technology only removes the pectin and impurities inside the flax fiber by high-temperature boiling, and adds bleaching agent to the clean water to bleach the flax fiber. The flax roving processed by this process has an internal impurity content of 1.4-2%, resulting in the existing flax roving being unable to quickly remove the internal pectin and impurities during the pretreatment process, and reduce the internal impurity content of the flax roving. Summary of the invention

[0005] In order to solve the above technical problems, the present invention provides a pretreatment method of flax roving combining biological enzyme and chemical degumming to solve the problems described in the above background technology.

[0006] The purpose and efficacy of the pretreatment method of flax roving combined with biological enzyme and chemical degumming of the present invention are achieved by the following specific technical means:

[0007] S1 Raw material processing: Select high-quality flax fiber as raw material, wash and screen the flax fiber, remove impurities and bad fibers inside the flax fiber, and select the part with better cellulose quality;

[0008] S2 soaking: adding hydrochloric acid and chlorine to clean water, the ratio of clean water, hydrochloric acid and chlorine is 36.5:1:1, and mixing clean water, hydrochloric acid and chlorine, soaking the stripped flax fiber in the mixed solution, the temperature of the mixed solution is 28-32°C, the water level of the mixed solution is above the flax fiber, and the soaking time is 87-120h, so as to soften it and remove impurities therein;

[0009] S3 Chemical degumming: Place the soaked flax fibers in an electric cooker, add water, sulfuric acid solution for pre-acidification, sodium hydroxide and sodium silicate for alkaline cooking in a ratio of 10:1:1.5:2, and set the temperature of the electric cooker at 60-80°C for 2-2.5 hours;

[0010] S4 biological enzyme: turn off the electric cooker, and when the internal temperature of the flax fiber after soaking is 30-35℃, pour the biological enzyme into the electric cooker, and stir the biological enzyme and flax fiber in the electric cooker for 10-20 minutes;

[0011] S5 Drying: The mixed flax fibers are placed in a dryer at a temperature of 90-105°C for 80-100 minutes.

[0012] S5 Combing and spinning: Place the dried flax fibers on the needle plate of the combing table and comb the flax fibers. Use a spinning machine to straighten the combed flax fibers and twist them into flax roving with a certain tension.

[0013] Preferably, in step S2, clean water, hydrochloric acid and chlorine are poured into the soaking tank, and the flax fibers are spread flat in the soaking tank.

[0014] Preferably, the soaked flax fibers are placed in front of an electric cooker, and the mixed solution on the surface of the flax fibers is removed by artificial drainage.

[0015] Preferably, during the cooking process of the flax fibers in the electric cooker, the flax fibers need to be manually turned over, and the turning frequency is 5 times / 30 minutes.

[0016] Beneficial effects:

[0017] 1. By soaking the flax fiber in a mixed solution of hydrochloric acid and chlorine, the flax fiber can be soaked and bleached for a long time by hydrochloric acid and chlorine, so that the hydrochloric acid and chlorine react with the flax fiber for a long time. After soaking, the flax fiber does not need to be dried, and then it is treated by a method combining chemical degumming and biological enzymes, which can quickly remove pectin and impurities in the flax fiber while maintaining good physical properties of the flax fiber, and can avoid the situation that the existing flax fiber needs to be boiled for a long time during the treatment process. The flax fiber is placed in a dryer for drying, so as to avoid the situation that the flax fiber is easily affected by weather and humidity during the drying process;

[0018] 2. Add hydrochloric acid and chlorine to clean water in a ratio of 36.5:1:1, mix the clean water, hydrochloric acid and chlorine, and immerse the stripped flax fiber in the mixed solution. The calculation of the ratio is based on the fact that chlorine can dissolve in water and partially react with water to generate hydrochloric acid and hypochlorous acid, wherein the chemical equation for the reaction of chlorine with water is Cl2+H2O→HCl+HClO. The above process can remove pigments and impurities in the flax fiber, thereby improving the purity of the flax fiber;

[0019] 3. Turn off the electric cooker. When the internal temperature of the flax fiber after soaking is 30-35℃, pour the biological enzyme into the electric cooker and stir the biological enzyme and flax fiber in the electric cooker for 10-20 minutes. The combination of biological enzyme and chemical degumming can selectively remove pectin, hemicellulose and lignin in the flax fiber, with little damage to the flax fiber, and can control the weight loss rate of flax crude fiber and reduce fiber strength loss.

[0020] 4. After soaking, the flax fibers are placed in front of the electric cooker, and the mixed solution on the surface of the flax fibers is removed by manual drainage. During the cooking process of the flax fibers in the electric cooker, the flax fibers need to be manually turned over, and the turning frequency is 5 times / 30 minutes. By adding clean water, sulfuric acid solution for pre-acidification, sodium hydroxide and sodium silicate for alkaline cooking in the electric cooker, the pectin and impurities inside the flax fibers can be quickly removed, thereby reducing the impurity content inside the flax fibers;

[0021] 5. By evaluating the flax rovings processed with different values, it can be learned that the overall score of the flax roving processed in Example 7 can reach 92 points, the flax roving prepared is evenly arranged in strips, soft to the touch, and the roving is evenly dry, and the internal impurity content of the flax roving is 0.5%. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a flow chart of the pretreatment of flax roving according to the present invention. DETAILED DESCRIPTION

[0023] The present invention will be described below with reference to examples; however, the present invention is not limited to the following examples.

[0024] In addition, in the following description, unless otherwise specified, % refers to m / m mass percentage. All reagents, raw materials and instruments used in the present invention are well known in the art and can be purchased from the market, but do not limit the implementation of the present invention. Other reagents and equipment well known in the art can be applied to the implementation of the following embodiments of the present invention.

[0025] Embodiment 1:

[0026] This embodiment provides a pretreatment method of flax roving combining biological enzyme and chemical degumming, and the specific steps are as follows:

[0027] S1 Raw material processing: Select high-quality flax fiber as raw material, wash and screen the flax fiber, remove impurities and bad fibers inside the flax fiber, and select the part with better cellulose quality;

[0028] S2 soaking: adding hydrochloric acid and chlorine to clean water, the ratio of clean water, hydrochloric acid and chlorine is 36.5:1:1, and mixing clean water, hydrochloric acid and chlorine, soaking the stripped flax fiber in the mixed solution, the temperature of the mixed solution is 28-32°C, the water level of the mixed solution is above the flax fiber, and the soaking time is 87-120h, so as to soften it and remove impurities therein;

[0029] S3 Chemical degumming: Place the soaked flax fibers in an electric cooker, add water, sulfuric acid solution for pre-acidification, sodium hydroxide and sodium silicate for alkaline cooking in a ratio of 10:1:1.5:2, and set the temperature of the electric cooker at 60-80°C for 2-2.5 hours;

[0030] S4 biological enzyme: turn off the electric cooker, and when the internal temperature of the flax fiber after soaking is 30-35℃, pour the biological enzyme into the electric cooker, and stir the biological enzyme and flax fiber in the electric cooker for 10-20 minutes;

[0031] S5 Drying: The mixed flax fibers are placed in a dryer at a temperature of 90-105°C for 80-100 minutes.

[0032] S5 Combing and spinning: Place the dried flax fibers on the needle plate of the combing table and comb the flax fibers. Use a spinning machine to straighten the combed flax fibers and twist them into flax roving with a certain tension.

[0033] Further, hydrochloric acid and chlorine are added into the clean water, the ratio of clean water, hydrochloric acid and chlorine is 36.5:1:1, and the clean water, hydrochloric acid and chlorine are mixed, and the stripped flax fiber is immersed in the mixed solution, the temperature of the mixed solution is 31° C., the water level of the mixed solution is above the flax fiber, and the immersion time is 100 hours, so as to soften it and remove impurities therein;

[0034] Further, the soaked flax fibers were placed in an electric cooker, and water, sulfuric acid solution for pre-acidification, sodium hydroxide and sodium silicate were added to the electric cooker for alkaline cooking in a ratio of 10:1:1.5:2. The temperature of the electric cooker was 68° C. for 2.1 h.

[0035] Furthermore, when the internal temperature of the flax fiber after soaking and boiling is 32° C., the biological enzyme is poured into the electric cooker, and the biological enzyme and the flax fiber in the electric cooker are stirred for 17 minutes;

[0036] Furthermore, the mixed flax fibers were placed in a dryer at a drying temperature of 98° C. for a drying time of 96 min.

[0037] Embodiment 2:

[0038] Add hydrochloric acid and chlorine into clean water, the ratio of clean water, hydrochloric acid and chlorine is 36.5:1:1, and mix the clean water, hydrochloric acid and chlorine, immerse the stripped flax fiber in the mixed solution, the temperature of the mixed solution is 28-32°C, the water level of the mixed solution is above the flax fiber, and the immersion time is 87-120 hours to soften it and remove impurities therein;

[0039] By soaking the flax fiber for a long time, hydrochloric acid and chlorine can react with the flax fiber for a long time. The calculation of this ratio is based on the fact that chlorine can dissolve in water and partially react with water to produce hydrochloric acid and hypochlorous acid. The chemical equation for the reaction between chlorine and water is:

[0040] Cl2+H2O→HCl+HClO

[0041] The above process can remove pigments and impurities inside the flax fiber, thereby improving the purity of the flax fiber.

[0042] Embodiment three:

[0043] Turn off the electric cooker. When the internal temperature of the flax fiber after soaking is 30-35°C, pour the biological enzyme into the electric cooker and stir the biological enzyme and flax fiber in the electric cooker for 10-20 minutes.

[0044] The combination of biological enzymes and chemical degumming can selectively remove pectin, hemicellulose and lignin from flax fibers with little damage to the flax fibers. It can control the weight loss rate of flax crude fibers and reduce fiber strength loss.

[0045] Embodiment 4:

[0046] Place the soaked flax fibers in an electric cooker, add water, sulfuric acid solution for pre-acidification, sodium hydroxide and sodium silicate for alkaline cooking in a ratio of 10:1:1.5:2, and set the temperature of the electric cooker at 60-80°C for 2-2.5 hours.

[0047] The chemical equation for the reaction of sulfuric acid solution and sodium hydroxide is:

[0048] H2SO4+2NaOH→Na2SO4+2H2O

[0049] The chemical equation for the reaction of sulfuric acid solution and sodium silicate is:

[0050] H2SO4+Na2SiO3→Na2SO4+H2SiO3

[0051] After soaking, the flax fibers are placed in front of an electric cooking pot, and the mixed solution on the surface of the flax fibers is removed by manual drainage. During the boiling process of the flax fibers in the electric cooking pot, the flax fibers need to be turned over manually, with a turning frequency of 5 times / 30 minutes. By adding clean water, sulfuric acid solution for pre-acidification, sodium hydroxide and sodium silicate for alkaline boiling in the electric cooking pot, pectin and impurities inside the flax fibers can be quickly removed, thereby reducing the impurity content inside the flax fibers.

[0052] Embodiment five:

[0053] First, high-quality flax fibers are selected as raw materials. The flax fibers are cleaned and screened, and impurities and bad fibers inside the flax fibers are removed. The cellulose part with better quality is selected, and hydrochloric acid and chlorine are added to clean water. The ratio of clean water, hydrochloric acid and chlorine is 36.5:1:1. Clean water, hydrochloric acid and chlorine are mixed, and the stripped flax fibers are immersed in the mixed solution. The temperature of the mixed solution is 28°C, and the water level of the mixed solution is above the flax fibers. The soaking time is 87 hours to soften it and remove impurities. The soaked flax fibers are placed in an electric cooker, and clean water and sulfuric acid solution are added to the electric cooker for pre-acidification. , sodium hydroxide and sodium silicate alkali boiling in the ratio of 10:1:1.5:2, the temperature of the electric cooking pot is 60℃, the time is 2h, the electric cooking pot is turned off, when the internal temperature of the flax fiber after boiling is 30℃, the biological enzyme is poured into the electric cooking pot, and the biological enzyme and flax fiber in the electric cooking pot are stirred for 10min, the mixed flax fiber is placed in the dryer, the drying temperature is 90℃, the drying time is 80min, the dried flax fiber is placed on the needle plate of the combing table, and the flax fiber is combed, the combed flax fiber is straightened by a spinning machine, and twisted into flax roving with a certain tension.

[0054] Embodiment six:

[0055] Firstly, high-quality flax fiber is selected as raw material, and the flax fiber is cleaned and screened, and impurities and bad fibers inside the flax fiber are removed, and the part with better cellulose quality is selected, and hydrochloric acid and chlorine are added into clean water, and the ratio of clean water, hydrochloric acid and chlorine is 36.5:1:1, and the clean water, hydrochloric acid and chlorine are mixed, and the stripped flax fiber is immersed in the mixed solution, and the temperature of the mixed solution is 29℃, and the water level of the mixed solution is above the flax fiber, and the immersion time is 95h to soften it and remove impurities therein, and the soaked flax fiber is placed in an electric cooker, and clean water and sulfuric acid solution are added into the electric cooker for pre-acidification, Sodium hydroxide and sodium silicate are alkaline boiled in a ratio of 10:1:1.5:2, the temperature of the electric cooker is 65℃, the time is 2.1h, the electric cooker is turned off, when the internal temperature of the flax fiber after boiling is 32℃, the biological enzyme is poured into the electric cooker, and the biological enzyme and flax fiber in the electric cooker are stirred for 15min, the mixed flax fiber is placed in a dryer, the drying temperature is 95℃, the drying time is 90min, the dried flax fiber is placed on the needle plate of the combing table, and the flax fiber is combed, the combed flax fiber is straightened using a spinning machine, and twisted into flax roving with a certain tension.

[0056] Embodiment seven:

[0057] First, high-quality flax fibers are selected as raw materials. The flax fibers are cleaned and screened, and impurities and bad fibers inside the flax fibers are removed. The cellulose part with better quality is selected, and hydrochloric acid and chlorine are added to clean water. The ratio of clean water, hydrochloric acid and chlorine is 36.5:1:1. Clean water, hydrochloric acid and chlorine are mixed, and the stripped flax fibers are immersed in the mixed solution. The temperature of the mixed solution is 31°C, and the water level of the mixed solution is above the flax fibers. The soaking time is 100 hours to soften it and remove impurities. The soaked flax fibers are placed in an electric cooker, and clean water and sulfuric acid solution are added to the electric cooker for pre-acidification. , sodium hydroxide and sodium silicate alkali boiling in the ratio of 10:1:1.5:2, the temperature of the electric cooking pot is 68℃, the time is 2.1h, the electric cooking pot is turned off, when the internal temperature of the flax fiber after boiling is 32℃, the biological enzyme is poured into the electric cooking pot, and the biological enzyme and flax fiber in the electric cooking pot are stirred for 17min, the mixed flax fiber is placed in the dryer, the drying temperature is 98℃, the drying time is 96min, the dried flax fiber is placed on the needle plate of the combing table, and the flax fiber is combed, the combed flax fiber is straightened by a spinning machine, and twisted into flax roving with a certain tension.

[0058] Embodiment eight:

[0059] Firstly, high-quality flax fiber is selected as raw material, and the flax fiber is cleaned and screened, and impurities and bad fibers inside the flax fiber are removed, and the part with better cellulose quality is selected, and hydrochloric acid and chlorine are added into clean water, and the ratio of clean water, hydrochloric acid and chlorine is 36.5:1:1, and the clean water, hydrochloric acid and chlorine are mixed, and the stripped flax fiber is immersed in the mixed solution, and the temperature of the mixed solution is 32℃, and the water level of the mixed solution is above the flax fiber, and the immersion time is 120h to soften it and remove impurities therein, and the soaked flax fiber is placed in an electric cooker, and clean water and sulfuric acid solution are added into the electric cooker for pre-acidification, Sodium hydroxide and sodium silicate are alkaline boiled in a ratio of 10:1:1.5:2, the temperature of the electric cooker is 80℃, the time is 2.5h, the electric cooker is turned off, when the internal temperature of the flax fiber after boiling is 35℃, the biological enzyme is poured into the electric cooker, and the biological enzyme and flax fiber in the electric cooker are stirred for 20min, the mixed flax fiber is placed in a dryer, the drying temperature is 105℃, the drying time is 100min, the dried flax fiber is placed on the needle plate of the combing table, and the flax fiber is combed, the combed flax fiber is straightened using a spinning machine, and twisted into flax roving with a certain tension.

[0060] Embodiment nine:

[0061] The flax rovings produced with different values ​​in Examples 5-8 were evaluated, and sensory evaluation standards were established based on slivering, softness, uniformity and impurity content;

[0062] Table 1: Sensory evaluation table of flax roving

[0063] Group stripedness Softness Uniformity Impurity rate Embodiment 5 Arranged evenly Soft touch The yarn is more uniform 2.5％ Embodiment 6 Uneven arrangement Soft touch Uniform yarn dryness 1.4％ Embodiment 7 Evenly arranged Very soft touch The yarn is very uniform 0.5％ Embodiment 8 Arranged evenly Soft touch Uneven yarn evenness 1％

[0064] Establish a score table based on the sensory evaluation table in Table 1;

[0065] Table 2: Comprehensive score table of flax roving

[0066] Group Stripeness score Softness score Neatness score Impurity rate score Comprehensive score Embodiment 5 15 17 11 10 53 Embodiment 6 5 15 19 15 54 Embodiment 7 25 23 22 22 92 Embodiment 8 15 17 5 17 54

[0067] By evaluating the flax roving processed with different values, it can be known that the overall score of the flax roving processed in Example 7 can reach 92 points, the flax roving prepared is evenly arranged in strips, soft to the touch, and the roving strips are uniform, and the internal impurity rate of the flax roving is 0.5%. Combining Table 1 and Table 2, it can be known that the flax roving prepared in the present application can greatly reduce the internal impurity rate of the flax roving and improve the overall quality of the flax roving.

[0068] Technical personnel should note that although the present invention has been described according to the above specific implementation methods, the inventive concept of the present invention is not limited to this invention, and any modification using the inventive concept will be included in the scope of protection of this patent.

Claims

1. A pretreatment method for flax roving combining biological enzyme and chemical degumming, characterized in that: The pretreatment method of flax roving combining biological enzyme and chemical degumming specifically comprises the following steps: S1 Raw material processing: Select high-quality flax fiber as raw material, wash and screen the flax fiber, remove impurities and bad fibers inside the flax fiber, and select the part with better cellulose quality; S2 soaking: adding hydrochloric acid and chlorine to clean water, the ratio of clean water, hydrochloric acid and chlorine is 36.5:1:1, and mixing clean water, hydrochloric acid and chlorine, soaking the stripped flax fiber in the mixed solution, the temperature of the mixed solution is 28-32°C, the water level of the mixed solution is above the flax fiber, and the soaking time is 87-120h, so as to soften it and remove impurities therein; S3 Chemical degumming: Place the soaked flax fibers in an electric cooker, add water, sulfuric acid solution for pre-acidification, sodium hydroxide and sodium silicate for alkaline cooking in a ratio of 10:1:1.5:2, and set the temperature of the electric cooker at 60-80°C for 2-2.5 hours; S4 biological enzyme: turn off the electric cooker, and when the internal temperature of the flax fiber after soaking is 30-35℃, pour the biological enzyme into the electric cooker, and stir the biological enzyme and flax fiber in the electric cooker for 10-20 minutes; S5 Drying: The mixed flax fibers are placed in a dryer at a temperature of 90-105°C for 80-100 minutes. S5 Combing and spinning: Place the dried flax fibers on the needle plate of the combing table and comb the flax fibers. Use a spinning machine to straighten the combed flax fibers and twist them into flax roving with a certain tension.

2. The pretreatment method of flax roving combining biological enzyme and chemical degumming according to claim 1, characterized in that: In step S2, clean water, hydrochloric acid and chlorine are poured into the soaking tank, and the flax fibers are spread flat in the soaking tank.

3. The pretreatment method of flax roving combining biological enzyme and chemical degumming according to claim 1, characterized in that: The soaked flax fibers are placed in front of the electric cooker, and the mixed solution on the surface of the flax fibers is removed by artificial drainage.

4. The pretreatment method of flax roving combining biological enzyme and chemical degumming according to claim 1, characterized in that: During the cooking process of the flax fibers in the electric cooker, the flax fibers need to be manually turned over, with a turning frequency of 5 times / 30 minutes.

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