CN-118386344-B - Method for synergy flocculation of bamboo fibers

CN118386344BCN 118386344 BCN118386344 BCN 118386344BCN-118386344-B

Abstract

The invention discloses a method for synergy flocculation of bamboo fibers, which comprises the steps of S1, cleaning and cutting original bamboo fibers to obtain the bamboo fibers, S2, immersing the bamboo fibers in an acid solution, stopping acid treatment when lignin in the bamboo fibers reaches a preset lignin removal rate to obtain the bamboo fibers with partial lignin removed from secondary walls, S3, immersing the bamboo fibers in an alkali solution, stopping treatment when polysaccharide content in the bamboo fibers reaches the preset polysaccharide removal rate to obtain the bamboo fibers with partial polysaccharide removed from the secondary walls, S4, sampling, placing the bamboo fibers in an ultrasonic cleaner, adding filler and water, taking the filling rate with optimal performance as a final filling rate, recording treatment time, S5, drying and drying the bamboo fibers, opening and wetting, roller carding and cross lapping, and sending the bamboo fibers into a needling machine for needling reinforcement to obtain bamboo fiber flocculus. The invention combines acid treatment, alkali treatment and filler, reduces the difference of strength and flexibility of the secondary wall in different directions, and realizes uniformity and consistency of fibers.

Inventors

SHI YANG
GE SHENGBO
WEI KEXIN
KANG XUELIAN

Assignees

南京林业大学

Dates

Publication Date: 20260512
Application Date: 20240524

Claims (8)

1. The method for synergy flocculation of the bamboo fiber is characterized by comprising the following steps: S1, selecting original bamboo fibers with good quality, and cleaning and cutting the bamboo fibers to obtain bamboo fibers with the specification of 5-10cm for removing impurities; S2, immersing the bamboo fibers obtained in the S1 into an acid solution with the pH of 1.5-2.5 for treatment, wherein the concentration of the acid solution is 0.5-5%, the acid treatment time is 75-80min, periodically sampling in the treatment process to monitor the lignin content in the bamboo fibers, and stopping the acid treatment when the lignin removal rate reaches a preset value to obtain the bamboo fibers with the lignin in the secondary walls partially removed; The method for monitoring the lignin content in the bamboo fiber comprises the following specific steps of: S21, collecting the bamboo fibers before treatment as a monitoring object, testing the initial lignin content by using a Klason method or an ultraviolet spectrum method, and recording as S 0 ; S22, taking out 2% of samples at intervals of 20-25min in the acid treatment process, testing the lignin content of the acid treatment by using the method in S21, and recording as S n ; S23, calculating lignin removal rate Comparing with the preset lignin removal rate range S Pre-preparation , stopping acid treatment when the lignin removal rate is within the preset lignin removal rate range; S3, immersing the bamboo fibers obtained in the S2 into an alkali solution with the pH of 11-13 for treatment, wherein the concentration of the alkali solution is 2% -5%, the alkali treatment time is 45-60min, monitoring the polysaccharide content in the bamboo fibers in the treatment process, and stopping the treatment when the polysaccharide content reaches a preset polysaccharide removal rate to obtain the bamboo fibers with partial polysaccharide removal in the secondary walls; The method for monitoring the polysaccharide content in the bamboo fiber comprises the following specific steps of: S31, collecting the bamboo fiber before treatment as a monitoring object, testing the initial polysaccharide content by using a phenol-sulfuric acid method or a high performance liquid chromatography, and recording as T 0 ; S32, taking out 2% of samples at intervals of 30-35min in the alkali treatment process, testing the content of alkali-treated polysaccharide by using the method in S31, and recording as T n ; S33, calculating the polysaccharide removal rate Comparing with the predetermined polysaccharide removal rate range T Pre-preparation , stopping the alkali treatment when the polysaccharide removal rate is within the predetermined polysaccharide removal rate range; S4, placing the bamboo fiber obtained in the S3 into an ultrasonic cleaner, adding filler and water, cleaning at 1200-1500W, detecting the filling rate of the bamboo fiber in real time, simultaneously performing performance test on the bamboo fiber, taking the filling rate with the optimal performance as the final filling rate, recording the treatment time, and cleaning all the bamboo fiber; S5, drying the bamboo fibers cleaned in the S4, opening and wetting the bamboo fibers, carding by a roller, cross-lapping, and carrying out needling reinforcement by a needling machine to obtain bamboo fiber flakes.
2. The method for synergistic flocculation of bamboo fibers as set forth in claim 1, wherein in said step S23, the predetermined lignin removal rate range S Pre-preparation is determined by the steps of: S231, respectively preparing a plurality of different lignin removal rate samples with lignin removed by 10%, 30%, 50%, 70% and 90%; s232, comparing strength and toughness indexes of samples with different lignin removal rates in different bamboo fibers, and measuring strength and toughness parameters of each sample through mechanical test equipment; S233, selecting the degree of the lignin removal rate to optimize the performance indexes of different bamboo fibers as a preset lignin removal rate range.
3. The method for synergistic flocculation of bamboo fibers as set forth in claim 1, wherein the specific step of stopping the acid treatment in S2 comprises washing the bamboo fibers with a sodium carbonate solution until pH=7, taking out, washing with deionized water for 10-15min, and drying.
4. The method for synergistic flocculation of bamboo fibers as set forth in claim 1, wherein in the step S2, the acid solution is sulfuric acid solution or hydrochloric acid solution, wherein the concentration of the sulfuric acid solution is 1% -5% and the concentration of the hydrochloric acid solution is 0.5% -3%.
5. The method for producing the synergistic flocculation of the bamboo fibers according to claim 1, wherein in the step S3, the alkali solution is sodium hydroxide solution or potassium hydroxide solution.
6. The method for synergistic flocculation of bamboo fibers as claimed in claim 1, wherein in said step S33, the predetermined polysaccharide removal rate range T Pre-preparation is determined by: s331, respectively preparing a plurality of samples with different polysaccharide removal rates, wherein the polysaccharide removal rates are 10%, 30%, 50%, 70% and 90% of the samples; S332, comparing strength and toughness indexes of samples with different polysaccharide removal rates in different bamboo fibers, and measuring strength and toughness parameters of each sample through mechanical test equipment; S333, selecting the degree of the polysaccharide removal rate to optimize the performance indexes of different bamboo fibers as a preset polysaccharide removal rate range.
7. The method for synergistic flocculation of bamboo fibers as set forth in claim 1, wherein in S4, the filler is one of calcium carbonate, silica or talc.
8. The method for synergistic flocculation of bamboo fibers as set forth in claim 1, wherein the specific step of stopping the alkali treatment in S3 comprises rinsing the bamboo fibers with a dilute acetic acid solution until pH=7, taking out, rinsing with deionized water for 10-15min, and drying.

Description

Method for synergy flocculation of bamboo fibers Technical Field The invention relates to the technical field of bamboo fibers, in particular to a method for synergy flocculation of bamboo fibers. Background Bamboo fiber is cellulose fiber extracted from natural bamboo. The bamboo fiber has the characteristics of good air permeability, instant water absorption, strong wear resistance, good dyeing property and the like, and has the functions of natural antibiosis, bacteriostasis, mite removal, deodorization, ultraviolet resistance and the like. The process of making the bamboo fiber into the floccule is that the bamboo fiber is processed into the floccule. The bamboo fiber is cellulose fiber extracted from natural bamboo, has the characteristics of good air permeability, instant water absorption, strong wear resistance, good dyeing property and the like, and also has the functions of natural antibiosis, bacteriostasis, mite removal, deodorization and ultraviolet resistance. The existing process for making the bamboo fiber into the cotton wool comprises the following steps of selecting fresh bamboo, removing the outer skin and the sections, leaving pure bamboo poles, crushing and bleaching the bamboo to obtain pure bamboo pulp, spinning the bamboo pulp to obtain slender bamboo fibers, and further processing the bamboo fibers, such as cutting, crushing and the like, so as to form floccules. Because the bamboo fiber is an environment-friendly material, the product of the bamboo fiber flocculation has certain environment-friendly property. However, the secondary wall of the bamboo fiber is of a multi-layer structure, in particular an ultra-microstructure formed by compounding primary walls and thin and thick alternate multi-layer secondary walls, more lignin and polysaccharide exist in the secondary walls, the lignification degree is high, the fiber feel is hard due to the too high lignin content, the flexibility and the processability of the fiber are affected, and the fiber is easy to break or abrade in the processing process due to the too high polysaccharide. And the secondary walls are as many as 8-9 layers, and the cell walls of each layer are thicker, so that the tensile strength of the fiber is high, and meanwhile, the secondary walls are layered more, so that the fiber performance difference is large, and the processing is difficult. Disclosure of Invention The invention overcomes the defects of the prior art and provides a method for synergy flocculation of bamboo fibers. In order to achieve the aim, the technical scheme adopted by the invention is that the method for producing the flocculation by synergy of the bamboo fiber comprises the following steps: S1, selecting original bamboo fibers with good quality, and cleaning and cutting the bamboo fibers to obtain bamboo fibers with the specification of 5-10cm for removing impurities; S2, immersing the bamboo fibers obtained in the S1 into an acid solution with the pH of 1.5-2.5 for treatment, wherein the concentration of the acid solution is 0.5-5%, the acid treatment time is 75-80min, periodically sampling in the treatment process to monitor the lignin content in the bamboo fibers, and stopping the acid treatment when the lignin removal rate reaches a preset value to obtain the bamboo fibers with the lignin in the secondary walls partially removed; S3, immersing the bamboo fibers obtained in the S2 into an alkali solution with the pH of 11-13 for treatment, wherein the concentration of the alkali solution is 2% -5%, the alkali treatment time is 45-60min, monitoring the polysaccharide content in the bamboo fibers in the treatment process, and stopping the treatment when the polysaccharide content reaches a preset polysaccharide removal rate to obtain the bamboo fibers with partial polysaccharide removal in the secondary walls; S4, placing the bamboo fiber obtained in the S3 into an ultrasonic cleaner, adding filler and water, cleaning at 1200-1500W, detecting the filling rate of the bamboo fiber in real time, simultaneously performing performance test on the bamboo fiber, taking the filling rate with the optimal performance as the final filling rate, recording the treatment time, and cleaning all the bamboo fiber; S5, drying the bamboo fibers cleaned in the S4, opening and wetting the bamboo fibers, carding by a roller, cross-lapping, and carrying out needling reinforcement by a needling machine to obtain bamboo fiber flakes. In a preferred embodiment of the present invention, in the step S2, the specific steps of monitoring the lignin content in the bamboo fiber are as follows: S21, collecting the bamboo fibers before treatment as a monitoring object, testing the initial lignin content by using a Klason method or an ultraviolet spectrum method, and recording as S 0; S22, taking out 2% of samples at intervals of 20-25min in the acid treatment process, testing the lignin content of the acid treatment by using the method in S21, and recording as S n; S23,