A banana / pineapple leaf fiber degumming agent and its preparation method and application

Abstract

The invention provides a banana / pineapple leaf fiber degumming agent and a preparation method and application thereof. The banana / pineapple leaf fiber degumming agent comprises the following raw materials in parts by weight: 20-30 parts of alkaline solution, 30-50 parts of ionic liquid, 15-30 parts of degumming aid, 1-5 parts of penetrant, 3-5 parts of chelating agent, 1-5 parts of stabilizer, 1-5 parts of dispersant, 10-15 parts of N-hydroxyphthalimide, 5-10 parts of sodium silicate, and 10-15 parts of ethylene glycol. The banana / pineapple leaf fiber degumming agent has good degumming effect, little damage to the fiber after degumming, and good mechanical properties of the prepared fiber, and has good application prospects in banana / pineapple leaf fiber production.

Description

Technical Field

[0001] The invention relates to the technical field of plant fiber production, and in particular to a banana / pineapple leaf fiber degumming agent and a preparation method and application thereof. Background Art

[0002] Natural plant fiber is one of the most abundant renewable resources in nature. It is biodegradable and environmentally friendly. Its main components, cellulose, hemicellulose and lignin, have functional groups that can participate in chemical reactions in their macromolecular structures. They can be used to prepare functional materials for various purposes, such as highly absorbent materials, heavy metal ion adsorption materials, medical and health materials, etc. They are widely used in the fields of textiles, papermaking and composite materials. For example, agricultural waste such as banana stems and pineapple leaves can be used as raw materials for fiber preparation, avoiding environmental pollution and resource waste caused by discarding them in the field or burning them in the past.

[0003] The process of preparing fibers from raw materials such as banana stems and pineapple leaves generally includes scraping, cleaning, degumming, combing and other processes. Degumming the fibers can ensure their better utilization in the textile processing industry. The quality of degumming largely determines the quality of plant fibers.

[0004] Commonly used degumming agents are generally alkalis. If the alkalinity is too strong, it is easy to cause great damage to the fiber, but if the alkalinity is too low, it is easy to cause a decrease in the degumming effect, so the requirements for process control are relatively high. In the existing banana and pineapple leaf fiber preparation technology, there is a method of degumming using an extractant composed of crude enzyme solution, enzyme stabilizer and alkali solution. Although this method is green and clean and avoids the use of a large amount of alkali, the degumming effect needs to be further improved, and the mechanical properties of the prepared fiber are also poor, which has great limitations in its application in the textile field.

[0005] Therefore, in order to meet the needs of practical applications, it is necessary to provide a banana / pineapple leaf fiber degumming agent with good degumming effect, little fiber damage after degumming, and good mechanical properties of the prepared fiber. Summary of the invention

[0006] In view of the problems existing in the prior art, the purpose of the present invention is to provide a banana / pineapple leaf fiber degumming agent with good degumming effect, little fiber damage after degumming, and good mechanical properties of the prepared fiber, so as to better meet the needs of practical applications.

[0007] To achieve this object, the technical solution of the present invention is as follows:

[0008] The invention provides a banana / pineapple leaf fiber degumming agent. The banana / pineapple leaf fiber degumming agent comprises the following raw materials in parts by weight: 20-30 parts of alkaline solution, 30-50 parts of ionic liquid, 15-30 parts of degumming auxiliary agent, 1-5 parts of penetrant, 3-5 parts of chelating agent, 1-5 parts of stabilizer, 1-5 parts of dispersant, 10-15 parts of N-hydroxyphthalimide, 5-10 parts of sodium silicate and 10-15 parts of ethylene glycol.

[0009] In some embodiments of the present invention, the alkaline solution is selected from at least one of a sodium hydroxide solution and a potassium hydroxide solution with a concentration of 0.1-0.25 mol / L (for example, 0.1 mol / L, 0.13 mol / L, 0.15 mol / L, 0.17 mol / L, 0.19 mol / L, 0.21 mol / L, 0.23 mol / L, 0.25 mol / L or any value therein).

[0010] In some embodiments of the present invention, the method for preparing the ionic liquid comprises the following steps:

[0011] (1) mixing 1-bromooctane and nitrogen methyl imidazole, stirring continuously under nitrogen protection, reacting, and purifying and drying after the reaction is completed;

[0012] (2) Add lactic acid and aqueous hydrogen bromide solution to the product obtained in step (1), stir evenly, and dropwise add aqueous hydrogen peroxide solution with a concentration of 25-30% to react, and the product is an ionic liquid.

[0013] In the preparation of the ionic liquid of the present invention, the mass ratio of 1-bromooctane to nitrogen methylimidazole in step (1) is 1:1-2 (for example, it can be 1:1, 1:1.5, 1:2 or any value therein), and the reaction time is 1-2h (for example, it can be 1h, 1.5h, 2h or any value therein).

[0014] In the preparation of the ionic liquid of the present invention, the mass of the lactic acid described in step (2) is 1-2 times that of 1-bromooctane (for example, it can be 1 time, 1.5 times, 2 times or any value therein), the concentration of the aqueous hydrogen bromide solution is 50-55% (for example, it can be 50%, 51%, 52%, 53%, 54%, 55% or any value therein), the mass of the aqueous hydrogen bromide solution is 0.5-0.8 times that of 1-bromooctane (for example, it can be 0.5 times, 0.6 times, 0.7 times, 0.8 times or any value therein); the mass of the hydrogen peroxide is 1-2 times that of 1-bromooctane (for example, it can be 1 time, 1.5 times, 2 times or any value therein), and the reaction time is 2-3h (for example, it can be 2h, 2.5h, 3h or any value therein).

[0015] In some embodiments of the present invention, the method for preparing the degumming aid comprises the following steps:

[0016] (1) Add anthraquinone and hydroxylamine sulfate to concentrated sulfuric acid, heat to 80-90° C., add a catalyst, react for 5-6 hours, filter, and dry to obtain an intermediate product I;

[0017] (2) adding the intermediate product I and isocyanoethyl methacrylate to a solvent, stirring evenly at 0-4° C., reacting for 3-5 hours, extracting and drying to obtain the intermediate product II;

[0018] (3) Add the intermediate product II and ammonium persulfate to N,N-dimethylformamide, stir evenly, heat to 75-85°C under the protection of nitrogen, react for 8-10 hours, extract and dry to obtain a degumming aid.

[0019] In the preparation method of the degumming aid of the present invention, the mass ratio of anthraquinone to hydroxylamine sulfate in step (1) is 1:2-3 (for example, it can be 1:2, 1:2.5, 1:3 or any value therein); the catalyst is selected from vanadium trioxide or vanadium pentoxide, and the mass of the catalyst is 1-3% of anthraquinone (for example, it can be 1%, 2%, 3% or any value therein).

[0020] In the preparation method of the degumming aid of the present invention, the solvent in step (2) is selected from chloroform or dichloromethane; the mass ratio of the intermediate product I to isocyanoethyl methacrylate is 1:2-3 (for example, it can be 1:2, 1:2.5, 1:3 or any value therein).

[0021] In the preparation method of the degumming aid of the present invention, the mass ratio of the intermediate product II to ammonium persulfate in step (3) is 10-20:1 (for example, it can be 10:1, 12:1, 13:1, 14:1, 15:1, 16:1, 17:1, 18:1, 19:1, 20:1 or any value therein).

[0022] In some embodiments of the present invention, the penetrant is selected from propylene glycol polyoxyethylene ether or lauric acid random polyether.

[0023] In some embodiments of the present invention, the chelating agent is selected from one or more combinations of sodium ethylenediaminetetramethylenephosphonate, glucose, metasilicic acid, and polyepoxysuccinic acid.

[0024] In some embodiments of the present invention, the stabilizer is selected from one or more combinations of sodium metabisulfite, ascorbic acid, and butylated hydroxyanisole.

[0025] The dispersant is selected from one or more combinations of polyethylene glycol, calcium stearate, and stearic acid amide.

[0026] A method for preparing a banana / pineapple leaf fiber degumming agent, the method comprising the following steps:

[0027] (1) adding N-hydroxyphthalimide, sodium silicate and ethylene glycol into an alkaline solution and mixing well;

[0028] (2) heating to 40-50° C., adding the ionic liquid, degumming aid, penetrant, chelating agent, stabilizer and dispersant to the system of step (1), stirring and mixing, and standing for 20-30 minutes to obtain a banana / pineapple leaf fiber degumming agent.

[0029] The invention discloses an application of a banana / pineapple leaf fiber degumming agent in the preparation of plant fiber. The application conditions of the banana / pineapple leaf fiber degumming agent in the preparation of plant fiber are as follows: a degumming temperature of 35° C.-40° C. (for example, 35° C., 36° C., 37° C., 38° C., 39° C., 40° C. or any value therein), and a degumming time of 1-5 h (for example, 1 h, 2 h, 3 h, 4 h, 5 h or any value therein).

[0030] Compared with the prior art, the present invention has the following beneficial effects:

[0031] (1) The banana / pineapple leaf fiber degumming agent prepared by the present invention, by adding ionic liquid, the anions inside the ionic liquid can effectively reduce the internal bond between fiber molecules, decompose lignin, remove impurities, and improve the degumming effect of the degumming agent, so that the prepared fiber has a low residual glue rate, good appearance, and no damage.

[0032] (2) The banana / pineapple leaf fiber degumming agent prepared by the present invention can remove excess primary free radicals or peroxy free radicals in plant fibers by adding a degumming auxiliary agent, thereby preventing cellulose from being severely oxidized and improving the mechanical properties of the fibers.

[0033] (3) The banana / pineapple leaf fiber degumming agent prepared by the present invention can selectively oxidize the primary hydroxyl groups in the cellulose molecules by adding N-hydroxyphthalimide, while having no effect on the secondary alcohol groups, thereby catalyzing the degradation of lignin and improving the degumming effect. DETAILED DESCRIPTION

[0034] The present invention will be described below in conjunction with specific embodiments. It should be noted that the following examples are examples of the present invention, which are only used to illustrate the present invention, but not to limit the present invention. Without departing from the gist or scope of the present invention, other combinations and various improvements within the concept of the present invention may be carried out. In the following examples, the compounds and related reagents used can be purchased from the market, wherein 1-bromooctane is purchased from Tianmen Hengchang Chemical Co., Ltd., nitrogen methyl imidazole and hydrogen bromide are purchased from Shenzhen Jintenglong Industrial Co., Ltd., anthraquinone is purchased from Jiangsu Walde Chemical Co., Ltd., hydroxylamine sulfate, isocyanoethyl methacrylate, and sodium ethylenediaminetetramethylenephosphonate are purchased from Shanghai Ba Gan Chemical Co., Ltd., and N-hydroxyphthalimide is purchased from Weifang Kairui Chemical Co., Ltd.

[0035] Preparation of ionic liquid I

[0036] (1) 200 g of 1-bromooctane and 250 g of nitrogen methyl imidazole were mixed under nitrogen protection, stirred continuously, and reacted for 2 h. After the reaction, the mixture was purified and dried.

[0037] (2) Add 400 g of lactic acid and 100 g of 50% aqueous hydrogen bromide solution to the product obtained in step (1), stir evenly, add 200 g of 30% aqueous hydrogen peroxide solution dropwise, and react for 2 h. The product is ionic liquid I.

[0038] Preparation of ionic liquid II

[0039] (1) Mix 200 g of 1-bromooctane and 400 g of nitrogen methyl imidazole under nitrogen protection, continue stirring, and react for 1 hour. After the reaction is completed, purify and dry.

[0040] (2) Add 200 g of lactic acid and 150 g of 55% aqueous hydrogen bromide solution to the product obtained in step (1), stir evenly, add 250 g of 30% aqueous hydrogen peroxide solution dropwise, and react for 2 h. The product is ionic liquid II.

[0041] Preparation of degumming aid I

[0042] The preparation method comprises the following steps:

[0043] (1) Add 100 g of anthraquinone and 300 g of hydroxylamine sulfate to 1000 g of concentrated sulfuric acid, heat to 90° C., add 0.5 g of vanadium trioxide, react for 6 h, filter and dry to obtain intermediate product I;

[0044] (2) 10 g of intermediate product I and 30 g of isocyanoethyl methacrylate were added to 60 g of chloroform, stirred evenly at 4° C., reacted for 5 h, and after extraction and drying, intermediate product II was obtained;

[0045] (3) Take 20 g of intermediate product II and 1 g of ammonium persulfate and add them to 50 g of N,N-dimethylformamide, stir evenly, heat to 85° C. under the protection of nitrogen, react for 10 h, extract and dry to obtain degumming aid I.

[0046] Preparation of degumming aid II

[0047] The preparation method comprises the following steps:

[0048] (1) Add 100 g of anthraquinone and 200 g of hydroxylamine sulfate to 1000 g of concentrated sulfuric acid, heat to 80° C., add 0.3 g of vanadium trioxide, react for 5 h, filter and dry to obtain intermediate product I;

[0049] (2) Take 10 g of intermediate product I and 20 g of isocyanoethyl methacrylate and add them to 30 g of chloroform, stir evenly, react for 5 h, extract and dry to obtain intermediate product II;

[0050] (3) Take 10 g of the intermediate product II and 1 g of ammonium persulfate and add them to 50 g of N,N-dimethylformamide, stir evenly, heat to 75°C under the protection of nitrogen, react for 8 hours, extract and dry to obtain the degumming aid II.

[0051] Example 1

[0052] The invention discloses a degumming agent for banana / pineapple leaf fiber. The degumming agent comprises the following raw materials in parts by weight: 30 parts of 0.25 mol / L sodium hydroxide solution, 150 parts of ionic liquid, 130 parts of degumming aid, 5 parts of propylene glycol polyoxyethylene ether, 5 parts of sodium ethylenediaminetetramethylenephosphonate, 5 parts of sodium pyrosulfite, 5 parts of polyethylene glycol, 15 parts of N-hydroxyphthalimide, 10 parts of sodium silicate and 15 parts of ethylene glycol.

[0053] Preparation method:

[0054] (1) adding N-hydroxyphthalimide, sodium silicate and ethylene glycol into a sodium hydroxide solution and mixing;

[0055] (2) heating to 50° C., adding ionic liquid I, degumming aid I, propylene glycol polyoxyethylene ether, sodium ethylenediaminetetramethylenephosphonate, sodium pyrosulfite and polyethylene glycol to the system of step (1), stirring and mixing, and standing for 30 minutes to obtain a degumming agent for banana / pineapple leaf fiber.

[0056] Example 2

[0057] A banana / pineapple leaf fiber degumming agent comprises the following raw materials in parts by weight: 30 parts of 0.1 mol / L sodium hydroxide solution, 150 parts of ionic liquid, 130 parts of degumming aid, 5 parts of propylene glycol polyoxyethylene ether, 5 parts of sodium ethylenediaminetetramethylenephosphonate, 5 parts of sodium pyrosulfite, 5 parts of polyethylene glycol, 15 parts of N-hydroxyphthalimide, 10 parts of sodium silicate and 15 parts of ethylene glycol.

[0058] The preparation method is the same as that in Example 1.

[0059] Example 3

[0060] A banana / pineapple leaf fiber degumming agent comprises the following raw materials in parts by weight: 20 parts of 0.1 mol / L sodium hydroxide solution, 150 parts of ionic liquid, 130 parts of degumming aid, 5 parts of propylene glycol polyoxyethylene ether, 5 parts of sodium ethylenediaminetetramethylenephosphonate, 5 parts of sodium pyrosulfite, 5 parts of polyethylene glycol, 15 parts of N-hydroxyphthalimide, 10 parts of sodium silicate and 15 parts of ethylene glycol.

[0061] The preparation method is the same as that in Example 1.

[0062] Example 4

[0063] The invention discloses a degumming agent for banana / pineapple leaf fiber. The degumming agent comprises the following raw materials in parts by weight: 20 parts of 0.1 mol / L sodium hydroxide solution, 50 parts of ionic liquid II, 30 parts of degumming aid I, 5 parts of propylene glycol polyoxyethylene ether, 5 parts of sodium ethylenediaminetetramethylenephosphonate, 5 parts of sodium pyrosulfite, 5 parts of polyethylene glycol, 15 parts of N-hydroxyphthalimide, 10 parts of sodium silicate and 15 parts of ethylene glycol.

[0064] The preparation method is the same as that in Example 1.

[0065] Example 5

[0066] The invention discloses a degumming agent for banana / pineapple leaf fiber. The degumming agent comprises the following raw materials in parts by weight: 20 parts of 0.1 mol / L sodium hydroxide solution, 30 parts of ionic liquid II, 30 parts of degumming aid I, 5 parts of propylene glycol polyoxyethylene ether, 5 parts of sodium ethylenediaminetetramethylenephosphonate, 5 parts of sodium pyrosulfite, 5 parts of polyethylene glycol, 15 parts of N-hydroxyphthalimide, 10 parts of sodium silicate and 15 parts of ethylene glycol.

[0067] The preparation method is the same as that in Example 1.

[0068] Example 6

[0069] The invention discloses a degumming agent for banana / pineapple leaf fiber. The degumming agent comprises the following raw materials in parts by weight: 20 parts of 0.1 mol / L sodium hydroxide solution, 30 parts of ionic liquid II, 30 parts of degumming aid II, 5 parts of propylene glycol polyoxyethylene ether, 5 parts of sodium ethylenediaminetetramethylenephosphonate, 5 parts of sodium pyrosulfite, 5 parts of polyethylene glycol, 15 parts of N-hydroxyphthalimide, 10 parts of sodium silicate and 15 parts of ethylene glycol.

[0070] The preparation method is the same as that in Example 1.

[0071] Example 7

[0072] The invention discloses a degumming agent for banana / pineapple leaf fiber. The degumming agent comprises the following raw materials in parts by weight: 20 parts of 0.1 mol / L sodium hydroxide solution, 30 parts of ionic liquid II, 15 parts of degumming aid II, 5 parts of propylene glycol polyoxyethylene ether, 5 parts of sodium ethylenediaminetetramethylenephosphonate, 5 parts of sodium pyrosulfite, 5 parts of polyethylene glycol, 15 parts of N-hydroxyphthalimide, 10 parts of sodium silicate and 15 parts of ethylene glycol.

[0073] The preparation method is the same as that in Example 1.

[0074] Example 8

[0075] The invention discloses a banana / pineapple leaf fiber degumming agent, which comprises the following raw materials in parts by weight: 20 parts of 0.1 mol / L sodium hydroxide solution, 30 parts of ionic liquid II, 15 parts of degumming aid II, 1 part of propylene glycol polyoxyethylene ether, 5 parts of sodium ethylenediaminetetramethylenephosphonate, 5 parts of sodium pyrosulfite, 5 parts of polyethylene glycol, 15 parts of N-hydroxyphthalimide, 10 parts of sodium silicate and 15 parts of ethylene glycol.

[0076] The preparation method is the same as that in Example 1.

[0077] Example 9

[0078] The invention discloses a banana / pineapple leaf fiber degumming agent, which comprises the following raw materials in parts by weight: 20 parts of 0.1 mol / L sodium hydroxide solution, 30 parts of ionic liquid II, 15 parts of degumming aid II, 1 part of propylene glycol polyoxyethylene ether, 3 parts of sodium ethylenediaminetetramethylenephosphonate, 5 parts of sodium pyrosulfite, 5 parts of polyethylene glycol, 15 parts of N-hydroxyphthalimide, 10 parts of sodium silicate and 15 parts of ethylene glycol.

[0079] The preparation method is the same as that in Example 1.

[0080] Example 10

[0081] The invention discloses a banana / pineapple leaf fiber degumming agent, which comprises the following raw materials in parts by weight: 20 parts of 0.1 mol / L sodium hydroxide solution, 30 parts of ionic liquid II, 15 parts of degumming aid II, 1 part of propylene glycol polyoxyethylene ether, 3 parts of sodium ethylenediaminetetramethylenephosphonate, 1 part of sodium pyrosulfite, 5 parts of polyethylene glycol, 15 parts of N-hydroxyphthalimide, 10 parts of sodium silicate and 15 parts of ethylene glycol.

[0082] The preparation method is the same as that in Example 1.

[0083] Embodiment 11

[0084] The invention discloses a banana / pineapple leaf fiber degumming agent, which comprises the following raw materials in parts by weight: 20 parts of 0.1 mol / L sodium hydroxide solution, 30 parts of ionic liquid II, 15 parts of degumming aid II, 1 part of propylene glycol polyoxyethylene ether, 3 parts of sodium ethylenediaminetetramethylenephosphonate, 1 part of sodium pyrosulfite, 1 part of polyethylene glycol, 15 parts of N-hydroxyphthalimide, 10 parts of sodium silicate and 15 parts of ethylene glycol.

[0085] The preparation method is the same as that in Example 1.

[0086] Example 12

[0087] The invention discloses a banana / pineapple leaf fiber degumming agent, which comprises the following raw materials in parts by weight: 20 parts of 0.1 mol / L sodium hydroxide solution, 30 parts of ionic liquid II, 15 parts of degumming aid II, 1 part of propylene glycol polyoxyethylene ether, 3 parts of sodium ethylenediaminetetramethylenephosphonate, 1 part of sodium pyrosulfite, 1 part of polyethylene glycol, 10 parts of N-hydroxyphthalimide, 10 parts of sodium silicate and 15 parts of ethylene glycol.

[0088] The preparation method is the same as that in Example 1.

[0089] Example 13

[0090] The invention discloses a banana / pineapple leaf fiber degumming agent, which comprises the following raw materials in parts by weight: 20 parts of 0.1 mol / L sodium hydroxide solution, 30 parts of ionic liquid II, 15 parts of degumming aid II, 1 part of propylene glycol polyoxyethylene ether, 3 parts of sodium ethylenediaminetetramethylenephosphonate, 1 part of sodium pyrosulfite, 1 part of polyethylene glycol, 10 parts of N-hydroxyphthalimide, 5 parts of sodium silicate and 15 parts of ethylene glycol.

[0091] The preparation method is the same as that in Example 1.

[0092] Embodiment 14

[0093] The invention discloses a banana / pineapple leaf fiber degumming agent, which comprises the following raw materials in parts by weight: 20 parts of 0.1 mol / L sodium hydroxide solution, 30 parts of ionic liquid II, 15 parts of degumming aid II, 1 part of propylene glycol polyoxyethylene ether, 3 parts of sodium ethylenediaminetetramethylenephosphonate, 1 part of sodium pyrosulfite, 1 part of polyethylene glycol, 10 parts of N-hydroxyphthalimide, 5 parts of sodium silicate and 10 parts of ethylene glycol.

[0094] The preparation method is the same as that in Example 1.

[0095] Comparative Example 1

[0096] The difference from Example 1 is that no ionic liquid is added.

[0097] Comparative Example 2

[0098] The difference from Example 1 is that no degumming aid is added.

[0099] Comparative Example 3

[0100] The difference from Example 1 is that N-hydroxyphthalimide is not added.

[0101] Comparative Example 4

[0102] The difference from Example 1 is that no ionic liquid, degumming aid, or N-hydroxyphthalimide is added.

[0103] The banana / pineapple leaf fiber degumming agent prepared in the embodiment and the comparative example was used in the production of pineapple fiber. The degumming conditions were as follows: the degumming temperature was 35° C. and the degumming time was 1.5 h. The performance of the produced pineapple fiber was tested. The tensile strength and breaking strength were tested with reference to the national standard GB 7689.5-2001. The residual glue rate was tested with reference to the standard GB / T18147.2-2008. The specific situation is shown in Table 1.

[0104] Table 1 Performance test results of banana / pineapple leaf fiber degumming agents prepared in Examples and Comparative Examples

[0105]

[0106]

[0107] By comparing the test results of Comparative Example 1 with those of Example 1, it can be seen that the banana / pineapple leaf fiber degumming agent prepared in Example 1 adds ionic liquid, so that the fiber prepared by the degumming process has a good appearance and a low residual glue rate; by comparing Comparative Example 2 with Example 1, it can be seen that the tensile strength and breaking strength of the fiber can be significantly improved by adding a degumming aid; by comparing Comparative Example 3 with Example 1, it can be seen that when the degumming agent of the present invention does not add N-hydroxyphthalimide, the degumming effect will be significantly reduced; by comparing Comparative Example 4 with Example 1, it can be seen that the addition of ionic liquid, degumming aid and N-hydroxyphthalimide is crucial to the degumming effect of the degumming agent. When they are not added, the tensile strength and breaking strength will be greatly reduced, the residual glue rate will be significantly increased, and the appearance of the prepared plant fiber is poor. By comprehensively comparing the test results of various embodiments and comparative examples, it can be seen that the banana / pineapple leaf fiber degumming agent provided by the present invention can remove excess primary free radicals or peroxy free radicals in plant fibers by using a degumming aid, thereby preventing cellulose from being severely oxidized and improving the mechanical properties of the fibers; by adding N-hydroxyphthalimide, the primary hydroxyl groups of cellulose molecules can be selectively oxidized, while having no effect on secondary alcohol groups, thereby catalyzing the degradation of lignin and improving the degumming effect; by adding ionic liquids, the internal bond effect between fiber molecules can be effectively reduced, lignin can be decomposed, impurities can be removed, and the degumming effect of the degumming agent can be improved, so that the produced fiber has a low residual glue rate, a good appearance, and no damage.

[0108] The above implementation modes are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with this technology to understand the content of the present invention and implement it, and they cannot be used to limit the protection scope of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be included in the protection scope of the present invention.

Claims

1. A banana / pineapple leaf fiber degumming agent, characterized in that: The invention comprises the following raw materials in parts by weight: 20-30 parts of alkaline solution, 30-50 parts of ionic liquid, 15-30 parts of degumming aid, 1-5 parts of penetrant, 3-5 parts of chelating agent, 1-5 parts of stabilizer, 1-5 parts of dispersant, 10-15 parts of N-hydroxyphthalimide, 5-10 parts of sodium silicate and 10-15 parts of ethylene glycol; The preparation method of the degumming auxiliary agent comprises the following steps: (1) Add anthraquinone and hydroxylamine sulfate to concentrated sulfuric acid, heat to 80-90° C., add a catalyst, react for 5-6 hours, filter, and dry to obtain an intermediate product I; (2) adding the intermediate product I and isocyanoethyl methacrylate to a solvent, stirring evenly at 0-4° C., reacting for 3-5 hours, extracting and drying to obtain the intermediate product II; (3) adding the intermediate product II and ammonium persulfate to N,N-dimethylformamide, stirring evenly, heating to 75-85° C. under the protection of nitrogen, reacting for 8-10 hours, extracting and drying to obtain a degumming aid; The preparation method of the ionic liquid comprises the following steps: (1) mixing 1-bromooctane and nitrogen methyl imidazole, stirring continuously under nitrogen protection, reacting, and purifying and drying after the reaction is completed; (2) Add lactic acid and aqueous hydrogen bromide solution to the product obtained in step (1), stir evenly, and dropwise add aqueous hydrogen peroxide solution with a concentration of 25-30% to react, and the product is an ionic liquid.

2. The banana / pineapple leaf fiber degumming agent according to claim 1, characterized in that: The alkaline solution is selected from at least one of a sodium hydroxide solution and a potassium hydroxide solution with a concentration of 0.1-0.25 mol / L.

3. The banana / pineapple leaf fiber degumming agent according to claim 1, characterized in that: The penetrant is selected from propylene glycol polyoxyethylene ether or lauric acid random polyether.

4. The banana / pineapple leaf fiber degumming agent according to claim 1, characterized in that: The chelating agent is selected from one or more combinations of sodium ethylenediaminetetramethylenephosphonate, glucose, metasilicic acid, and polyepoxysuccinic acid.

5. The banana / pineapple leaf fiber degumming agent according to claim 1, characterized in that: The stabilizer is selected from one or more combinations of sodium pyrosulfite, ascorbic acid, and butylated hydroxyanisole.

6. The banana / pineapple leaf fiber degumming agent according to claim 1, characterized in that: The dispersant is selected from one or more combinations of polyethylene glycol, calcium stearate, and stearic acid amide.

7. A method for preparing a banana / pineapple leaf fiber degumming agent as claimed in any one of claims 1 to 6, characterized in that: The preparation method of the banana / pineapple leaf fiber degumming agent comprises the following steps: (1) adding N-hydroxyphthalimide, sodium silicate and ethylene glycol into an alkaline solution and mixing well; (2) heating to 40-50° C., adding the ionic liquid, degumming aid, penetrant, chelating agent, stabilizer and dispersant to the system of step (1), stirring and mixing, and standing for 20-30 minutes to obtain a banana / pineapple leaf fiber degumming agent.

8. Use of the banana / pineapple leaf fiber degumming agent as claimed in any one of claims 1 to 6 in the preparation of banana / pineapple leaf fiber, wherein the application conditions of the banana / pineapple leaf fiber degumming agent in the preparation of banana / pineapple leaf fiber are: degumming temperature 35° C.-40° C., degumming time 1-5 h.

Images