阅读说明：本技术 一种以杜仲叶林模式枝木为原料制备高白度纸浆的方法 (Method for preparing high-whiteness paper pulp by taking eucommia ulmoides leaf forest mode branches as raw materials ) 是由 陈昌洲 迟明超 王功团 韦洁锐 于 2019-11-14 设计创作，主要内容包括：本发明公开了一种以杜仲叶林模式枝木作为原料制备高白度纸浆的方法。该方法以叶林模式杜仲枝木为原料,并通过碱性过氧化氢机械浆的制浆方法得到纸浆。首先,杜仲本身是名贵的经济树种,具有极高的开发价值。杜仲叶可用于提取杜仲精粉和开发功能饮料,杜仲的树皮具有极高的药用价值,杜仲胶属于天然高分子化合物,已经被广泛应用到橡胶和其他航天材料的开发和利用方面,只有大量的杜仲枝木无法被开发利用。其次,杜仲枝木与其他造纸原料相比具有纤维气孔多、易于漂白等优点,以杜仲叶林模式每年产生废料--杜仲枝木作为原料进行制浆,有利于杜仲叶林模式的综合利用,在保护环境的基础上提高农民的经济效益,也为杜仲叶林模式全综合利用起到了巨大的推进作用。(The invention discloses a method for preparing high-whiteness paper pulp by taking eucommia ulmoides leaf forest mode branches as raw materials. The method takes the leaf forest mode eucommia branch wood as a raw material, and obtains paper pulp by a pulping method of alkaline hydrogen peroxide mechanical pulp. Firstly, eucommia itself is a rare economic tree species, and has extremely high development value. The eucommia leaves can be used for extracting eucommia fine powder and developing functional beverages, the bark of eucommia has extremely high medicinal value, the gutta percha belongs to natural high molecular compounds, and is widely applied to the aspects of development and utilization of rubber and other aerospace materials, and only a large amount of eucommia branches cannot be developed and utilized. And secondly, compared with other papermaking raw materials, the eucommia ulmoides branch wood has the advantages of more fiber pores, easiness in bleaching and the like, and pulping is carried out by taking eucommia ulmoides branch wood which is waste generated in an eucommia ulmoides leaf forest mode every year as a raw material, so that the comprehensive utilization of the eucommia ulmoides leaf forest mode is facilitated, the economic benefit of farmers is improved on the basis of environmental protection, and a huge propulsion effect is also played for the comprehensive utilization of the eucommia ulmoides leaf forest mode.)

1. A method for preparing high-whiteness paper pulp by taking eucommia ulmoides leaf forest mode branches as raw materials is characterized by comprising the following steps:

(1) cutting 1-2 year old eucommia ulmoides oliv forest mode branches into pencil thick and thin wood strips, soaking the pencil thick and thin wood strips in clear water for 24 hours, and then placing the raw materials in hot water at 90 ℃ for treatment for 30 min;

(2) extruding and defibering the branch wood raw material of the eucommia ulmoides leaf forest mode after the hot water treatment by using a spiral extruding and defibering machine, wherein the compression ratio is 4: 1-5: 1;

(3) putting the extruded eucommia ulmoides leaf forest pattern branch raw material into the first stageChemical pre-impregnation, the first stage chemical pre-impregnation of the liquor from H₂O₂NaOH and sodium silicate, wherein H₂O₂The addition amount of the sodium silicate is 2-5% of the absolutely dry eucommia ulmoides branch wood raw material, the addition amount of NaOH is 2-5% of the absolutely dry eucommia ulmoides branch wood raw material, the addition amount of the sodium silicate is 2% of the absolutely dry eucommia ulmoides branch wood raw material, and the treatment is carried out for 1 hour at the temperature of 70-90 ℃;

(4) carrying out secondary extrusion defibering on the eucommia ulmoides leaf forest mode branch wood raw material subjected to the first-stage chemical impregnation by using a spiral extrusion defibering machine, wherein the compression ratio is 4: 1-5: 1;

(5) performing second-stage chemical impregnation on the eucommia ulmoides oliver forest model branch wood raw material subjected to second extrusion, wherein the liquid medicine of the second-stage chemical impregnation is prepared from H₂O₂NaOH and NaSiO₃Composition of, wherein H₂O₂The adding amount of the sodium silicate is 10 percent of the raw material of the absolutely dry eucommia ulmoides leaf forest mode branch wood, the adding amount of the NaOH is 3 percent of the raw material of the absolutely dry eucommia ulmoides leaf forest mode branch wood, the adding amount of the sodium silicate is 2 percent of the raw material of the absolutely dry eucommia ulmoides leaf forest mode branch wood, and the soaking is carried out for 1 hour at the temperature of 70-90 ℃;

(6) and (3) sequentially passing the eucommia ulmoides leaf forest model branch wood raw material subjected to the second-stage chemical impregnation through different disc mill gaps to obtain high-whiteness paper pulp with the disc mill gaps of 0.5mm and 0.2mm respectively, and measuring the whiteness of the paper pulp to be 77.1% ISO-81.2% ISO after paper making.

2. The method for preparing high-whiteness pulp from eucommia ulmoides oliver forest mode branches as raw materials according to claim 1, wherein the eucommia ulmoides oliver forest mode branches in the step (1) are 1-2 year old branches of eucommia ulmoides oliver forest mode branches or branches of eucommia ulmoides oliver planting modes.

3. The method for producing high-whiteness pulp from eucommia ulmoides oliver forest type branches as a raw material according to claim 1, wherein the ratio of the amount of sodium hydroxide to the amount of hydrogen peroxide in the chemical used in the first stage impregnation in the step (3) is 1: 1.

Technical Field

The present invention belongs to the field of developing new raw material for paper making. In particular to a method for preparing high-whiteness paper pulp by taking eucommia ulmoides oliver forest mode branches as raw materials.

Background

Eucommia bark belongs to a single family and a single genus of single plants, is a special economic tree species in China, and the planting area in China accounts for more than 95% of the planting area all over the world. However, the traditional arbor planting mode of eucommia ulmoides is not suitable for mechanical operation, comprehensive utilization of eucommia ulmoides cannot be achieved, and the overall economic utilization value is low. Professor Suyin spring develops a brand-new eucommia leaf forest mode on the basis of the eucommia arbor forest mode. The eucommia leaf forest mode is different from the bridge forest mode, and simply speaking, the leaf forest mode is an operation mode of changing tall trees into dwarfed trees, and the eucommia leaf forest mode can overcome the defects of the tree forest mode and has the advantages of planting in the same year and income in the same year; the method has the characteristics of one-time planting and annual income, can realize the maximum development and utilization of leaves and barks of eucommia ulmoides, and because the leaf forest mode adopts a mode of 'stumping' every year to renovate plants, the height of the plants is about 2m, so that the method is suitable for mechanized harvesting; in 2018, the branches and leaves of eucommia ulmoides are batched and have homology of medicine and food, so that the vigorous development of the eucommia ulmoides leaf forest mode in China can be further promoted.

The leaf forest mode generates a large amount of peeled branches every year, the diameter of each branch is 0.5-3 cm, and the branches cannot be used as furniture raw materials due to small diameter and can only be used for low-value combustion and heat production. The eucommia ulmoides leaf forest mode is a development mode of a brand-new economic ecological forest, combines environmental protection and increase of farmer income into a whole, and has high development value. According to the invention, a large number of branches generated in the eucommia ulmoides leaf forest mode are used as the paper pulp and paper making raw materials, so that the comprehensive development and utilization of the eucommia ulmoides leaf forest mode can be promoted, and energy can be saved to provide new raw materials for pulping and paper making.

Chinese patent publication No. CN10193603A describes a method for preparing activated carbon from eucommia ulmoides branches. Crushing eucommia ulmoides branches into wood chips, uniformly mixing the wood chips with an activating agent zinc chloride solution, and carrying out ultrasonic treatment for 4-5 hours; putting the uniformly mixed raw materials into a tubular furnace for carbonization at the temperature of 500-800 ℃; the carbonized raw material is subjected to three working sections of activating agent recovery, rinsing, drying and the like to obtain the activated carbon. The obtained activated carbon is detected, and experimental results show that all indexes of the activated carbon are higher than national requirements. The method for preparing the activated carbon by using the eucommia branch wood has the advantages of low cost, good adsorption performance and the like, but the method has less raw material consumption and cannot effectively solve the problem of branch wood waste caused by large-area planting in a leaf forest mode.

The eucommia ulmoides branch wood is a waste which is not developed and utilized at present, and has the following two characteristics when applied to pulping and papermaking:

1. the raw materials can be directly processed without peeling treatment. In the pulping and papermaking process, the bark fiber content is low, so that chemical liquid is easy to absorb, and the used raw materials must be peeled, otherwise, the paper quality is influenced. Because the branch bark generated in the eucommia ulmoides leaf forest mode has extremely high medicinal value, the branch generated in the eucommia ulmoides leaf forest mode is peeled branch, and the characteristic saves a large amount of mechanical and labor cost for pulping and papermaking enterprises.

2. The eucommia branch wood has more grain hole structures. Branches produced in the eucommia ulmoides leaf forest mode have huge roots in the ground to provide sufficient water and inorganic salt for the branches, and the branches have a higher growth speed, so that adjacent cells have more pits to serve as exchange channels of water and nutrients. In the pulp and paper making process, the existence of a large number of pores provides a channel for the penetration of liquid medicine and the outflow of lignin (see the scanning electron microscope image of eucommia bark pulp in the description of the attached drawings).

Disclosure of Invention

The invention aims to provide a method for preparing high-whiteness paper pulp by taking eucommia ulmoides leaf forest mode branches as raw materials.

The technical scheme of the invention for solving the technical problems is as follows.

A method for preparing high-whiteness paper pulp by taking eucommia ulmoides leaf forest mode branches as raw materials comprises the following steps:

(1) sawing 1-2 years old eucommia ulmoides branch wood, cutting into pencil thickness, soaking in clear water for 24h, and treating the raw materials in hot water at 90 ℃ for 30 min;

(2) extruding and defibering the eucommia ulmoides branch wood raw material subjected to hot water treatment by using a screw extruding and defibering machine, wherein the compression ratio is 4: 1-5: 1;

(3) putting the extruded eucommia ulmoides branch wood raw material into a first section of chemical preimpregnation, wherein the liquid medicine of the first section of chemical preimpregnation is prepared from H₂O₂NaOH and NaSiO₃Composition of, wherein H₂O₂The addition amount of the sodium hydroxide is 2-5% of the raw material of the absolutely dry eucommia ulmoides branch wood, the addition amount of the NaOH is 2-5% of the raw material of the absolutely dry eucommia ulmoides branch wood, and the NaSiO₃The addition amount of the eucommia ulmoides branch wood is 2 percent of the raw material of the absolutely dry eucommia ulmoides branch wood, and the eucommia ulmoides branch wood is soaked for 1 hour at the temperature of 70-90 ℃;

(4) performing secondary extrusion and defibering on the eucommia ulmoides branch wood raw material subjected to the first-stage chemical impregnation by using a spiral extrusion defibering machine, wherein the compression ratio is 4: 1-5: 1

(5) Performing a second stage of chemical impregnation on the eucommia ulmoides branch raw material subjected to the second extrusion, wherein the liquid medicine of the second stage of chemical impregnation mainly comprises H₂O₂NaOH and NaSiO₃Composition of, wherein H₂O₂The addition amount of the sodium hydroxide is 10 percent of the raw material of the absolutely dry eucommia bark branches, the addition amount of the NaOH is 3 percent of the raw material of the absolutely dry eucommia bark branches, and the NaSiO₃The addition amount of the eucommia ulmoides branch wood is 2 percent of the raw material of the absolutely dry eucommia ulmoides branch wood, and the eucommia ulmoides branch wood is soaked for 1 hour at the temperature of 70-90 ℃;

(6) sequentially passing the eucommia ulmoides branch wood raw material subjected to two-stage chemical impregnation through different disc mill gaps to obtain high-whiteness paper pulp;

the eucommia ulmoides branches in the step (1) are 1-2 year old branches in an eucommia ulmoides leaf forest mode, and can also be branches in other eucommia ulmoides planting modes; the compression ratio of the extrusion fluffer in the steps (2) and (4) is 4: 1-5: 1; NaOH and H in the chemicals used in the first stage of impregnation in step (3)₂O₂The ratio of the dosage is 1: 1.

The method of the invention has the following advantages:

1. the eucommia ulmoides branch wood is not required to be peeled, and can be directly used for papermaking production, so that the production efficiency is improved, and the production cost is reduced;

2. the existence of the texture hole structure lines during chemical impregnation provides a channel for liquid medicine to enter the fibers (see the scanning electron microscope image of eucommia ulmoides pulp in the figure description), improves the utilization efficiency of the liquid medicine, and saves the raw material cost.

3. The method not only solves the problem of storage and treatment of a large number of branches generated by the eucommia ulmoides leaf mode, but also provides a new raw material source for the pulping and papermaking industry, and increases the income of farmers while protecting the environment.

Drawings

FIG. 1 is a scanning electron microscope image of eucommia ulmoides branch paper with an illumination time of 1 year in example 1 of the present invention;

FIG. 2 is a scanning electron micrograph of eucommia ulmoides branch paper in example 3 of the present invention;

FIG. 3 is a scanning electron microscope image of eucommia ulmoides branch wood paper in example 5 of the present invention;

FIG. 4 is a scanning electron microscope image of eucommia ulmoides branch paper in example 7 of the present invention;

Detailed Description

The present invention will be described with reference to specific embodiments. The embodiments described below are preferred embodiments of the present disclosure, which are provided only for illustrating and explaining the present invention and are not intended to limit the present invention.