CN113529472B - Bright yellow antibacterial natural-color bamboo paper pulp and paper product thereof - Google Patents
Bright yellow antibacterial natural-color bamboo paper pulp and paper product thereof Download PDFInfo
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- CN113529472B CN113529472B CN202010303174.0A CN202010303174A CN113529472B CN 113529472 B CN113529472 B CN 113529472B CN 202010303174 A CN202010303174 A CN 202010303174A CN 113529472 B CN113529472 B CN 113529472B
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H11/00—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only
- D21H11/12—Pulp from non-woody plants or crops, e.g. cotton, flax, straw, bagasse
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07G—COMPOUNDS OF UNKNOWN CONSTITUTION
- C07G1/00—Lignin; Lignin derivatives
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08H—DERIVATIVES OF NATURAL MACROMOLECULAR COMPOUNDS
- C08H6/00—Macromolecular compounds derived from lignin, e.g. tannins, humic acids
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
- D21B1/00—Fibrous raw materials or their mechanical treatment
- D21B1/04—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres
- D21B1/12—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres by wet methods, by the use of steam
- D21B1/14—Disintegrating in mills
- D21B1/16—Disintegrating in mills in the presence of chemical agents
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
- D21C1/00—Pretreatment of the finely-divided materials before digesting
- D21C1/06—Pretreatment of the finely-divided materials before digesting with alkaline reacting compounds
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F11/00—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W90/00—Enabling technologies or technologies with a potential or indirect contribution to greenhouse gas [GHG] emissions mitigation
- Y02W90/10—Bio-packaging, e.g. packing containers made from renewable resources or bio-plastics
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Abstract
The invention relates to bright yellow antibacterial natural-color bamboo paper pulp and a paper product thereof. The mass ratio of the sum of the mass of pentosan and acid-insoluble lignin to the mass of cellulose in the bamboo paper pulp is 1 to (0.3-8.0), and the bright yellow natural color bamboo paper pulp is made into 80g/m 2 The yellow chromaticity b after the wafer paper is 23-33, L is 63-72, a is 2-5. The natural components of the bamboo are fully reserved in the bamboo pulp, the hemicellulose with stronger hydrophilic performance and fiber elasticity is fully reserved, the lignin with stronger oil absorption performance is reserved as the components of the pulp product, and the substance components which are naturally present in the bamboo and beneficial to sterilization and disinfection are reserved in the bamboo pulp, so that the proportioning of pentosan, acid-insoluble lignin and cellulose in the bamboo pulp product has excellent antibacterial performance, and therefore the bamboo pulp product has good antibacterial performance, water absorption, oil absorption and writing performance. The product has better advantages when being used as a raw material to develop paper for daily use, food packaging paper and writing paper.
Description
Technical Field
The invention belongs to the field of industrial papermaking, particularly relates to bright yellow antibacterial natural color bamboo paper pulp and a paper product thereof, and provides a pulping method applied to production of the bamboo paper pulp.
Background
With the deep humanity of the environmental protection idea, the natural color paper is popular in the trillion-level paper product market. In recent years, the natural color paper products such as packaging paper, kraft paper, household paper, writing paper and the like have been rapidly expanded and have great market potential. The present production method of natural color paper products has the steps of biological fermentation or traditional chemical method processes and bleaching links reduction. The biological fermentation method is more used for pulping and papermaking of straw pulp, and bamboo with a compact structure is difficult to be used as a biological fermentation method for pulping, so that the application range of the method has certain limitation. The traditional chemical method process reduces bleaching links, reduces harm of chemical raw materials such as partial chlorine, benzene, fluorescent powder and the like to human bodies, but damages energy of intercellular combination through excessive auxiliary agents such as alkali, sodium sulfide, anthraquinone and the like and higher temperature and pressure, damages natural ingredients in cellulose, hemicellulose, lignin and plants to generate partial toxic and harmful substances, causes odor and massive black liquor pollution, has low extraction rate of cellulose of main ingredients of the natural color paper pulp obtained by the production process, seriously damages hemicellulose with stronger hydrophilic performance and fiber elasticity, seriously loses lignin with stronger oil absorption performance, and naturally-existing substance ingredients beneficial to sterilization and disinfection in the bamboo are damaged by high-temperature strong-base environment. In the traditional chemical pulping process, the paper has unsatisfactory color tone, gray and dark color and weak visual pleasure to consumers.
Disclosure of Invention
Aiming at the defects of paper products and pulping technology in the prior art and industry, the invention aims to provide bamboo pulp which fully retains natural components of bamboo and has excellent antibacterial property, unique brilliant yellow color and fresh bamboo fragrance; the bamboo paper pulp has a color suitable for human eyes, can well protect the eyes, and is a natural color paper product with good antibacterial property, water absorbability, oil absorbability and writing performance.
It has been found through long-term investigation by the inventors that the yellowness and brightness of pulp and paper products thereof, the antibacterial properties of the paper products are related to the content of pentosan, acid-insoluble lignin and the same, and to the ratio of pentosan, acid-insoluble lignin and cellulose. In order to obtain pulp and paper products with excellent color and antibacterial performance, the applicant of the present invention also optimizes the pulping process for producing pulp with the performance, and realizes that the pulp contains pentosan, acid-insoluble lignin and cellulose with specific content.
In order to solve the technical problem, the invention provides bright yellow natural color bamboo paper pulp, wherein the mass ratio of the sum of the mass of pentosan and acid-insoluble lignin to the mass of cellulose in the bamboo paper pulp is 1 to (0.3-8.0).
The specific gravity of cellulose in the paper pulp is higher in the paper pulp in normal production, while the content of the cellulose in the paper pulp is lower in the invention, two reasons are provided, one is to ensure that pentosan and acid-insoluble lignin in bamboo wood are not excessively degraded in the degradation process, and on the other hand, the method can be realized by recycling and adding substances such as acid-insoluble lignin and pentosan in the papermaking black liquor into the paper pulp, so that the paper pulp has better color index and antibacterial performance.
Preferably, in the bright yellow natural color bamboo pulp, the ratio of the mass sum of the pentosan and the acid-insoluble lignin to the mass of the cellulose in the pulp is 1: (0.50-3.00); it is particularly preferred that the ratio of the sum of the mass of the pentosan and the acid-insoluble lignin to the mass of the cellulose in the pulp is 1: (0.70-2.90).
Preferably, in the bright yellow natural color bamboo pulp, the mass ratio of the pentosan to the acid-insoluble lignin in the pulp is 1 to (0.1-10), preferably, the mass ratio of the pentosan to the acid-insoluble lignin in the pulp is 1 to (0.4-6.0), and particularly preferably, the mass ratio of the pentosan to the acid-insoluble lignin in the pulp is 1 to (1.0-5.5).
Preferably, in the bright yellow natural color bamboo pulp, the sum of the mass of the pentosan, the acid-insoluble lignin and the cellulose accounts for 80 to 99 percent of the mass of the bamboo pulp; preferably, the sum of the mass of the pentosan, the acid-insoluble lignin and the cellulose accounts for 85 to 98 percent of the mass of the bamboo pulp.
Preferably, in the bright yellow natural color bamboo pulp, the bright yellow natural color bamboo pulp is processed to 80g/m 2 The yellow chromaticity b after the wafer paper is 23-33.
Preferably, in the bright yellow natural color bamboo pulp, the bright yellow natural color bamboo pulpMaking into 80g/m 2 L is 63-72, a is 2-5.
The invention also provides a paper product prepared from the bright yellow natural color bamboo paper pulp.
Preferably, in the paper product, the mass percentage of the bright yellow natural color bamboo paper pulp in the paper product is 5-100wt%, preferably, the mass percentage of the bright yellow natural color bamboo paper pulp in the paper product is 50-100wt%, and particularly preferably, the mass percentage of the bright yellow natural color bamboo paper pulp in the paper product is 80-100wt%.
Preferably, in the paper product, the paper product is natural color household paper, kraft paper, rice paper, natural color cultural paper, high-strength low-gram-weight corrugated paper, fiberboard, agricultural film paper, food packaging paper, natural color lunch box or natural color paper cup.
Preferably, in the bright yellow natural color bamboo pulp, the preparation method of the natural color bamboo pulp comprises a pretreatment step and a pulp grinding step, wherein the pretreatment step comprises the following steps: soaking or spraying the bamboo chips or bamboo strips by using hot alkali liquor, and then soaking or spraying the bamboo chips or bamboo strips by using low-dose hot alkali liquor after the alkali absorbed by the bamboo chips or bamboo strips is 5-15% of the absolute dry weight of the bamboo chips, wherein the total soaking or spraying time is 5-40 hours, so as to obtain the pretreated bamboo raw material, the hot alkali liquor is solution with the sodium hydroxide concentration of 10-500g/l and the temperature of 50-100 ℃, and the solvent of the solution is water.
The plant raw materials for pulping are bamboo raw materials, including but not limited to one or more of bamboo raw materials such as moso bamboo, yellow bamboo, sagittaria trifoliata, green bamboo, single bamboo, phyllostachys pubescens, water bamboo, phyllostachys edulis, dendrocalamus latiflorus, sasa albo-marginata, sifengzhu, siji bamboo, and Phyllostachys nigra.
The invention also provides a method for preparing the bright yellow natural color bamboo pulp, which is characterized by comprising the steps of pretreatment and pulp grinding, wherein the pretreatment step comprises the following steps: soaking or spraying the bamboo chips or bamboo strips with hot alkali liquor, so that the alkali absorbed by the bamboo chips or bamboo strips is 5-15% of the absolute dry weight of the bamboo chips, and then soaking or spraying with low-dose hot alkali liquor for 5-40 hours to obtain the pretreated bamboo raw material, wherein the hot alkali liquor is a solution with the concentration of 10-500g/l of sodium hydroxide and the temperature of 50-100 ℃, and the solvent of the solution is water.
Preferably, the method further comprises the step of recycling the black liquor obtained in the pretreatment step for soaking or spraying. Preferably, the method further comprises the steps of performing acidification treatment on the black liquor obtained in the pretreatment step, and adding the precipitation product into the bamboo pulp.
The performance of the bamboo paper pulp has a great relationship with the reaction temperature in the pulping process. The reaction temperature of the existing chemical pulp process is too high, the low temperature is more than 100 ℃, even at 100 ℃, the boiling is required, sometimes the highest temperature reaches 165-175 ℃, in the process of processing bamboo wood under strong conditions, lignin in the bamboo wood is seriously oxidized, and the product is blackened and darkened. In addition, in order to prevent the oxidized lignin from affecting the color of paper, the prior art only needs to add excessive alkali to completely remove the lignin, but also removes hemicellulose with stronger hydrophilic property and fiber elasticity, and removes substances which are naturally present in bamboo and beneficial to sterilization and disinfection. The product yield is low, the cost is too high due to excessive alkali, the economic benefit is influenced, and the color, bamboo fragrance, water absorption and oil absorption performance, physical performance and sterilization performance of the product are seriously reduced.
Specifically, the invention provides a preparation method of a paper product, which comprises the following steps:
(1) Preparing materials: selecting bamboo raw materials according to product application and raw material resource conditions, cutting raw bamboos into bamboo chips with uniform length and width, screening and washing to remove impurities on the surfaces of the bamboos;
(2) Pretreatment: conveying the processed bamboo chips into a large storage bin, wherein the size of the storage bin is suitable for storing the amount of the bamboo chips for pulping for 2-3 days, heating to 50-100 ℃ by matching with alkali with the concentration of 10-500g/l (calculated by sodium hydroxide) to obtain hot alkali liquor, soaking the bamboo in the hot alkali liquor or spraying the bamboo chips to absorb the alkali with the amount of 5-15% of the absolute dry amount of the bamboo chips, and continuously soaking or spraying the bamboo chips with low-dose hot alkali liquor after the bamboo chips absorb enough alkali liquor, wherein the total soaking or spraying time is 5-40 hours;
(3) Grinding: grinding the pretreated bamboo raw material into thick liquid by using a pulping machine or a kneading machine, promoting lignin in the raw material to be dissolved and dissociated from fibers by virtue of the synergistic action of chemistry, physics and machinery, releasing fiber bundles, and obtaining the fiber material which can fully retain natural bamboo components such as fibers, semi-fibers, lignin and the like of the bamboo;
(4) Pulping: the slurry is washed clean, one of the washing methods is three-stage vacuum countercurrent washing. The bamboo paper pulp after being washed is made into pulp board on a pulp board machine, and the pulp board is purified by a pressure screen and a desander in the process of making the pulp board by the bamboo paper pulp;
(5) Papermaking: the cleaned wet pulp or pulp board is crushed and pulped, and then is subjected to batching, net surfing, drying and curling to prepare products such as natural color household paper, kraft paper, rice paper, agricultural film paper, food packaging paper, natural color cultural paper and the like, or products such as high-strength low-gram heavy corrugated paper, fiber board, natural color lunch boxes, natural color paper cups and the like are prepared by pressing films of grinding tools;
(6) Lignin utilization: and (3) circularly applying the alkali liquor for soaking or spraying the bamboo chips for many times until the black liquor is saturated, acidifying and settling lignin, filtering the lignin, and utilizing or directly adsorbing the lignin on paper pulp to jointly make paper into a paper product.
The invention has the beneficial effects that:
1. the bamboo pulp fully retains natural components of bamboo, hemicellulose with strong hydrophilic performance and fiber elasticity is fully retained, lignin with strong oil absorption performance is retained as components of the pulp product, and substance components which are naturally present in the bamboo and are beneficial to sterilization and disinfection are retained in the bamboo pulp, so that the mixture ratio of pentosan, acid-insoluble lignin and cellulose in the bamboo pulp product has excellent antibacterial performance, and the bamboo pulp product has good antibacterial performance, water absorption performance, oil absorption performance and writing performance. The product has better advantages when being used as a raw material to develop paper for daily use, food packaging paper and writing paper.
2. Toilet paper, office paper and the like prepared by the bamboo paper pulp have unique bright yellow and fresh bamboo fragrance, and the yellow chromaticity b of the terminal paper product developed by the bamboo paper pulp is 22-33, which belongs to the yellow range of the color more suitable for human eyes and can well protect eyes.
3. The bamboo pulp is prepared without a cooking process, and the bamboo can be decomposed only by spraying and soaking, namely the decomposition temperature is far lower than that of the prior art, so that the energy consumption can be greatly reduced. The process has low alkali consumption, low effective alkali content in the black liquor, and can directly recycle the black liquor without alkali recovery, thereby achieving the effects of saving water and electricity and reducing energy consumption.
4. The method optimizes the alkali amount to the optimal amount of extracted fiber in the process of preparing the bamboo paper pulp, which is far lower than the prior art, and the alkali can ensure that the structures of cellulose, hemicellulose and lignin are hardly damaged on the premise of dissolving and separating most of the lignin, thereby ensuring high-yield pulping, and no auxiliary agents such as high-pollution sodium sulfide and the like are used, so that the use amount of medicines is reduced, the environmental pollution load is reduced, the cost is reduced, and the economic benefit is improved.
5. The invention greatly reduces the water consumption for washing the paper pulp due to low alkali consumption, and simultaneously, the beating rinsing liquid and the pulping black liquid can be repeatedly applied to higher concentration, thereby further reducing the water consumption, and further solving the technical problems that the black liquid can not be applied, the water consumption is high and a large amount of black liquid is difficult to treat in the original paper industry.
The specific implementation mode is as follows:
the invention is further illustrated by the following non-limiting examples:
example 1: preparation of bamboo pulp
Preparing 2000Kg bamboo sheet with dried raw material by sodium hydroxide, heating to 90-95 deg.C to obtain hot alkali solution, spraying the hot alkali solution onto bamboo with a rotary nozzle with flow rate of 20m 3 The alkali amount absorbed by the bamboo chips is checked in a sampling mode in the spraying process every hour (high spraying amount infiltration), when the alkali amount absorbed by the bamboo chips is about 8 percent of the absolute dry amount of the bamboo chips (the high spraying amount infiltration time reaching the value is measured), the alkali spraying amount of hot alkali liquor is reduced to 10m 3 Spraying bamboo chips with low spraying amount at a speed of one hour, and spraying with low spraying amountThe drenching soaking time is the preset total soaking time minus the high spraying amount soaking time. The total soaking time is calculated by the sum of the two spraying soaking times. And (3) spraying and washing with clear water after the total soaking time is reached, spraying and washing alkali liquor on the surface of the bamboo, and then grinding the soaked and washed bamboo chips into pulp to prepare the bamboo pulp meeting the papermaking quality requirement.
In the spraying (namely the infiltration process), the flowing black liquor contains alkali liquor and is mixed with hot alkali liquor for cyclic application, and the number of cyclic spraying application can be adjusted.
According to the above operation, a plurality of bamboo chips were treated, and the treatment conditions of the M01-M08 groups were as shown in Table 1 below.
TABLE 1 conditions of treating each group of bamboo chips with hot alkali solution
| Bamboo chip processing set | Soaking time (hours) | Alkali concentration (g/L) | Black liquor recycling sleeve (times) |
| M01 | 12 | 90 | 0 |
| M02 | 12 | 100 | 0 |
| M03 | 10 | 130 | 0 |
| M04 | 14 | 130 | 1 |
| M05 | 13 | 90 | 2 |
| M06 | 15 | 100 | 2 |
| M07 | 18 | 90 | 3 |
| M08 | 16 | 100 | 4 |
The concentration of decomposition components in the black liquor is improved by hot alkali liquor spraying and black liquor circulating application, the water consumption can be reduced, the water consumption is reduced by water spraying washing, and the sprayed water can also be recycled application. The energy consumption is low in the spraying process, only the alkali liquor needs to be heated, the bamboo chips are soaked in the spraying mode, the requirement on the field is low, the bamboo chips can be soaked in a large scale, and the quantity of the soaked bamboo chips is large.
The bamboo pulp prepared by the above method has a unique bright yellow color in appearance (see example 3 later in the color after paper making), and is perceived to have a fresh bamboo flavor in taste.
The components of the bamboo pulp obtained after each group of bamboo chips are detected, the contents of cellulose, acid-insoluble lignin and pentosan are mainly measured, the pentosan is measured according to GB/T745-2003 (measurement of pulp pentosan), the acid-insoluble lignin is measured according to GB/T747-2003 (measurement of pulp acid-insoluble lignin), and the cellulose is measured according to the nitric acid-ethanol method for measuring the content of the cellulose in pulping and papermaking analysis and detection). Other components contained in the bamboo pulp were not detected. The composition of each group of bamboo pulp obtained by soaking is shown in the following table 2.
Table 2 detection results of the contents of polypentaose, acid-insoluble lignin and cellulose in bamboo pulp components
| Bamboo pulp sample number | Pentosan content (%) | Acid-insoluble lignin content (%) | Cellulose content (%) |
| M01 | 12.26 | 5.26 | 72.44 |
| M02 | 5.23 | 5.26 | 84.94 |
| M03 | 6.63 | 7.21 | 74.48 |
| M04 | 10.96 | 12.66 | 67.71 |
| M05 | 11.64 | 16.33 | 65.35 |
| M06 | 9.42 | 17.50 | 62.83 |
| M07 | 11.36 | 20.17 | 66.17 |
| M08 | 8.34 | 44.00 | 37.87 |
Because the alkali liquor soaked in the preparation process of the bamboo pulp is low in concentration and low in strength, components which are naturally present in the bamboo and beneficial to antibacterial property are reserved, and components which are beneficial to water absorption and oil absorption are reserved, so that the pulp product has good antibacterial property, water absorption, oil absorption and writing performance.
Example 2: testing of antibacterial property of bamboo paper pulp
After the bamboo paper pulp is used for producing toilet paper through a household paper production line, the sample toilet paper is numbered as W01-W08 according to the sample numbers M01-M08 of the bamboo paper pulp, meanwhile, toilet paper of natural color paper produced by bamboo of two manufacturers on the market is used as a reference, the numbers are D01 and D02, and antimicrobial performance measurement is carried out under the same conditions. The determination of the microorganism index was carried out according to the method of appendix C of GB/T20810-2018. The measurement results are shown in table 3 below.
TABLE 3 toilet paper antimicrobial Performance results
The examination of the toilet paper prepared by the bamboo paper pulp of the example 1 and the toilet paper on the market shows that the microbiological indexes meet the standard requirements. The total number of bacterial colonies of the toilet paper prepared from the bamboo pulp of example 1 is less than or equal to 1/5 of the specification of less than or equal to 600CFU/g, and none of the bacterial colonies exceeds 100CFU/g. The antimicrobial index of the bamboo pulp toilet paper on the market meets the standard requirement, but the antimicrobial performance is lower. As can be seen from table 3, the antibacterial properties of W04-W08 are significantly higher, and also from the components of the prepared bamboo pulp, the antibacterial properties are higher due to the high content of pentosan and acid-insoluble lignin.
Example 3: paper color testing of bamboo pulp
The obtained bamboo pulp prepared in example 1 was made into 80g/M2 round piece paper, the number of the round piece paper prepared from the bamboo pulp slurry M01-M08 was Z01-Z08, two samples K01 and K02 were taken from the natural color paper prepared from commercially available bamboo pulp, and the lightness coordinate L, the chromaticity coordinate a, and the yellow chromaticity b were measured by a device color spectrum (CHN spec) gloss meter. The specific results are shown in Table 4 below.
Table 4 paper color results table
| Numbering | L* | a* | b* |
| Z01 | 80.36 | 2.57 | 26.43 |
| Z02 | 58.60 | 3.26 | 27.81 |
| Z03 | 70.64 | 2.39 | 24.59 |
| Z04 | 65.71 | 4.99 | 25.11 |
| Z05 | 71.13 | 2.81 | 26.45 |
| Z06 | 70.39 | 3.26 | 27.81 |
| Z07 | 68.97 | 4.30 | 24.59 |
| Z08 | 63.25 | 3.05 | 25.11 |
| K01 | 76.64 | -1.53 | 20.91 |
| K02 | 85.44 | 0.82 | 27.81 |
By measuring the color of the paper made from the pulp prepared in example 1 to be in the range of L63-72, a 2-5,b, 22-33, the end product had a color suitable for the human eye, and was very pleasing to the eye.
Claims (6)
1. A bright yellow natural color bamboo pulp, wherein the mass ratio of the sum of the mass of pentosan and acid-insoluble lignin to the mass of cellulose in the bamboo pulp is 1: (0.70-2.90), wherein the mass ratio of the pentosan to the acid-insoluble lignin is 1: (1.0-5.5), the sum of the weight of the pentosan, the acid-insoluble lignin and the cellulose accounts for 80-99 percent of the weight of the bamboo pulp, and the bright yellow natural color bamboo pulp is made into 80g/m 2 The yellow chromaticity b of the wafer paper is 23-33, L is 63-72, a is 2-5, the yellow chromaticity is shown in the specificationThe preparation method of the natural color bamboo paper pulp comprises a pretreatment step and a pulp grinding step, wherein the pretreatment step comprises the following steps: spraying the bamboo chips or bamboo strips with hot alkali liquor, so that the alkali absorbed by the bamboo chips or bamboo strips is 5-15% of the absolute dry weight of the bamboo chips, and then spraying with low-dose hot alkali liquor for 5-40 hours to obtain the pretreated bamboo raw material, wherein the hot alkali liquor is a solution with the sodium hydroxide concentration of 10-500g/l and the temperature of 50-100 ℃, and the solvent of the solution is water.
2. The natural color bamboo pulp according to claim 1, characterized in that the sum of the mass of pentosan, acid-insoluble lignin and cellulose accounts for 85-98% by mass of the bamboo pulp.
3. A paper product prepared from the bright yellow natural color bamboo pulp of any one of claims 1-2, wherein the mass percentage of the bright yellow natural color bamboo pulp in the paper product is 5-100wt% of the mass of the paper product.
4. The paper product according to claim 3, characterized in that the mass percentage of the bright yellow natural color bamboo pulp in the paper product is 50-100 wt.% of the mass of the paper product.
5. The paper product according to claim 4, characterized in that the percentage of the bright yellow natural color bamboo pulp in the paper product is 80-100 wt.% based on the mass of the paper product.
6. The paper product of claim 5, wherein the paper product is natural color household paper, kraft paper, natural color cultural paper, high-strength low-grammage corrugated paper, fiberboard, agricultural film paper, food packaging paper, natural color lunch boxes or natural color paper cups.
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| CN107988643A (en) * | 2016-10-26 | 2018-05-04 | 佛山源诚顺生态纺织科技有限公司 | A kind of preparation method that true qualities bamboo cellulose fibre is prepared using true qualities bamboo made fiber pulp |
| CN107988835A (en) * | 2017-10-16 | 2018-05-04 | 四川永丰纸业股份有限公司 | A kind of method that low temperature displacement dipping produces high yield pulp1 true qualities bamboo pulp |
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