阅读说明：本技术 一种无纺布专用纤维素纤维的制备方法 (Preparation method of special cellulose fiber for non-woven fabric ) 是由 郑柏山 刘勇 么志高 刘辉 陈冲 李胜国 安娜 田健泽 郑晓晨 于捍江 赵秀媛 于 2020-06-30 设计创作，主要内容包括：本发明涉及一种无纺布专用纤维素纤维的制备方法,以浆粕为原料,在用浆粕制备纤维素纤维的过程中加入碱木素或天然植物色素。与现有普通纤维素纤维的生产方法相比,本发明在纤维素纤维的工艺过程中取消了漂白,加入碱木素或天然植物色素,得到的纤维色泽天然,是一种可广泛用于非织造领域的纤维,且能够达到国标GB/T14463-2008或相关行业标准的产品要求。(The invention relates to a preparation method of special cellulose fiber for non-woven fabric, which takes pulp as raw material, and alkali lignin or natural plant pigment is added in the process of preparing the cellulose fiber by the pulp. Compared with the prior production method of the common cellulose fiber, the invention cancels bleaching in the process of the cellulose fiber, adds alkali lignin or natural plant pigment, obtains the fiber with natural color, is the fiber which can be widely used in the non-woven field, and can meet the product requirements of the national standard GB/T14463-2008 or related industrial standards.)

1. A preparation method of special cellulose fiber for non-woven fabric is characterized in that pulp is used as a raw material, and alkali lignin or natural plant pigment is added in the process of preparing the cellulose fiber by using the pulp.

2. The method for preparing cellulose fiber specially used for non-woven fabric according to claim 1, wherein the process for preparing cellulose fiber by pulp comprises: the pulp is prepared into viscose dope through a glue making process, the viscose dope is prepared into spinning dope, the spinning dope is spun through a spinning process to prepare nascent fiber bundles, and the nascent fiber bundles are treated through a post-treatment process to prepare finished cellulose fibers.

3. The method for preparing cellulose fiber specially used for non-woven fabric according to claim 2, wherein the alkali lignin or the natural plant pigment is added in the step of preparing the spinning solution or in the post-treatment process of the nascent fiber bundle.

4. The method for preparing cellulose fiber specially used for non-woven fabric according to any one of claims 1 to 3, characterized in that the natural plant pigment comprises one or two of curcumin and gardenia yellow.

5. The method for preparing the cellulose fiber specially used for the non-woven fabric according to claim 4, wherein the method for preparing the natural plant pigment comprises the following steps:

1) freeze drying plant material containing natural plant pigment for 48 hr, pulverizing with pulverizer, and sieving to obtain plant powder; adding 70% ethanol solution into the plant powder, performing ultrasonic extraction at 40 deg.C for 45min, and filtering to obtain primary plant pigment extractive solution;

2) adding the plant powder residue filtered in the step 1) into an ethanol solution with the volume fraction of 70%, performing ultrasonic extraction again at 40 ℃ for 45min, filtering to obtain a secondary plant pigment extracting solution, and combining the two extracting solutions;

3) distilling and purifying the combined extracting solution obtained in the step 2) by a rotary evaporator to obtain a plant pigment stock solution, wherein the effective components in the plant pigment stock solution are one or two of curcumin monomers and gardenia yellow monomers;

4) and adding sodium lignosulfonate into deionized water to be completely dissolved, mixing with the plant pigment stock solution after dissolving, and stirring for 30min under high shear to obtain the natural plant pigment.

6. The preparation method of the cellulose fiber specially used for the non-woven fabric as claimed in claim 5, wherein the content of the effective component in the plant pigment stock solution is not less than 30%, the content of the sodium lignosulfonate is not less than 20% of the effective component of the natural plant pigment, and the adding amount of the natural plant pigment is 0.05-10% of the effective component of the alpha cellulose in the viscose stock solution.

7. The method for preparing cellulose fiber specially used for non-woven fabric according to claim 5, wherein the plant material containing natural plant pigment comprises one or two of rhizome of Curcuma longa and fruit of Gardenia jasminoides Ellis; in the steps 1) and 2), the material-liquid ratio of the plant powder or the plant powder residue to the ethanol solution is 1g to 20 mL.

8. The method for preparing cellulose fiber specially used for non-woven fabric according to any one of claims 1 to 3, characterized in that the addition amount of the alkali lignin is 0.5-15% of the weight of the alpha cellulose in the viscose stoste.

9. The preparation method of the cellulose fiber special for the non-woven fabric according to any one of claims 1 to 3, characterized in that the dry strength of the cellulose fiber is more than or equal to 2.5cN/dtex, the wet strength is more than or equal to 1.1cN/dtex, and the whiteness is 30-60%.

Technical Field

The invention relates to a preparation method of a cellulose fiber special for non-woven fabrics, belonging to the field of preparation of fibers special for non-woven fabrics.

Background

With the tightening of national environmental protection policies, environmental protection meanings are getting deeper and deeper, and green health increasingly becomes the basic requirement of the public and also becomes an important consideration of the government to enterprises. Along with environmental protection tides, the environmental protection trend of products in various industries is becoming more and more obvious, people increasingly demand natural products, most common fiber products in life do not need to be over bleached any more, fluorescent whitening agents are not used, and the pollution to water and the environment is reduced while the production cost is controlled. Meanwhile, with the research of the metabolism mechanism of the synthetic pigment in the human body, the synthetic pigment is found to generate chronic toxicity to the human body, and a plurality of countries have already issued relevant laws to prohibit the application of the synthetic pigment.

The natural plant pigment is diketone pigment and carotenoid pigment, and comprises one or two of curcumin monomer and gardenia yellow monomer, which are easily dissolved in organic solvent, and the pigment with strong stability and colorability is formed after extraction, is not easy to fade after coloring, but is sensitive to light, heat and iron ions, and has poor light resistance, heat resistance and iron ion resistance. At present, the method is mainly applied to food processes such as cakes, candies, beverages, ice cream, colored wine and the like, and also applied to the pharmaceutical industry and animal feeds. The invention is especially provided for obtaining the cellulose fiber special for the non-woven fabric.

The alkali lignin is obtained by adding strong alkali into the wood chips for cooking, dissolving the lignin in alkali liquor and then performing spray drying, and the alkali lignin has a wide relative molecular mass range from hundreds to millions, and has different functions due to different application modes.

In addition, lignosulfonates have been used as dispersants for dye processing since 1909, and lignin-based dispersants have been widely used in the dye industry over a hundred years of development. In a dye system, the oleophilic base end of the lignosulfonate is towards the dye, the hydrophilic base end is towards water, and the dye particles are prevented from being condensed through the synergistic action of electrostatic repulsion and steric hindrance, so that the effects of dilution and dispersion are achieved. In the commercial dye, lignosulfonate is added as a filling agent type dispersing agent to play a role in stabilizing and diluting, so that the quality of the dye is ensured and the cost is reduced. The natural plant pigment is directly added into the viscose stock solution, and the natural plant pigment can also be regarded as a dye. However, natural plant pigment has poor dispersion performance in viscose, and is easy to generate agglomeration, so that dark yellow spots are generated on finished fibers. In order to solve the problem, the natural plant pigment is more uniformly distributed in the viscose, and sodium lignosulfonate is introduced into the natural plant pigment as a dispersing agent.

Disclosure of Invention

The invention aims to solve the technical problem of providing a preparation method of the special cellulose fiber for the non-woven fabric, and the prepared fiber presents natural color and has the characteristics of cleanness, no fluorescence, low residual sulfur and the like.

The technical scheme for solving the technical problems is as follows: a preparation method of special cellulose fiber for non-woven fabric takes pulp as raw material, and alkali lignin or natural plant pigment is added in the process of preparing the cellulose fiber by using the pulp.

The invention has the beneficial effects that: compared with the prior production method of the common cellulose fiber, the invention cancels bleaching in the process of the cellulose fiber, adds alkali lignin or natural plant pigment, obtains the fiber with natural color, is the fiber which can be widely used in the non-woven field, and can meet the product requirements of the national standard GB/T14463-2008 or related industrial standards.

On the basis of the technical scheme, the invention can be further improved as follows.

Further, the pulp comprises one or more of wood pulp, bamboo pulp and cotton pulp.

Further, the process for preparing cellulose fiber by using pulp comprises the following steps: the pulp is prepared into viscose dope through a glue making process, the viscose dope is prepared into spinning dope, the spinning dope is spun through a spinning process to prepare nascent fiber bundles, and the nascent fiber bundles are treated through a post-treatment process to prepare finished cellulose fibers.

Further, the glue making process comprises the following steps: dipping, squeezing, yellowing, post-dissolving, filtering and defoaming; the spinning process adopts wet spinning; the post-treatment process comprises the following steps: high-temperature cooking degassing, acid washing, water washing, desulfurizing, oiling and drying.

The beneficial effect of adopting the further scheme is that: the bleaching process of the fiber refining stage is cancelled, the bleaching is to improve the whiteness of the fiber, so that the color of the fiber is brighter and whiter, a large amount of production water is consumed in the bleaching process, and partial bleaching liquid components can be remained in the fiber. The non-woven fabrics used on the medical sanitary materials cannot have bright and white luster, and the bleaching process is omitted in the invention for enlarging the application range of the non-woven fabrics.

Further, the alkali lignin or the natural plant pigment is added in the step of preparing the spinning solution, or in the post-treatment process of the nascent fiber bundle.

The method has the advantages that the natural plant pigment can be added into the viscose stock solution to prepare a spinning stock solution or added into a post-treatment process of nascent fiber bundles, specifically, the oiling step in the post-treatment process is implemented, the oiling agent used in the oiling step is a special oiling agent for non-woven fabric fibers, the concentration of the oiling agent is 3.5-4.0 g/L, and the temperature is 60-65 ℃.

According to the invention, preferably, the natural plant pigment is added into the viscose stock solution and is uniformly blended to obtain the spinning stock solution. The obtained fiber is natural in color by adding natural plant pigment, has the characteristics of no peculiar smell, low residual sulfur, cleanness, no fluorescence and the like, and can be used for special fiber of non-woven fabric.

Further, the natural plant pigment comprises one or two of curcumin and gardenia yellow.

Further, the preparation method of the natural plant pigment comprises the following steps:

1) freeze drying plant material containing natural plant pigment for 48 hr, pulverizing with pulverizer, and sieving to obtain plant powder; adding 70% ethanol solution into the plant powder, performing ultrasonic extraction at 40 deg.C for 45min, and filtering to obtain primary plant pigment extractive solution;

2) adding the plant powder residue filtered in the step 1) into an ethanol solution with the volume fraction of 70%, performing ultrasonic extraction again at 40 ℃ for 45min, filtering to obtain a secondary plant pigment extracting solution, and combining the two extracting solutions;

3) distilling and purifying the combined extracting solution obtained in the step 2) by a rotary evaporator to obtain a plant pigment stock solution, wherein the effective components in the plant pigment stock solution are one or two of curcumin monomers and gardenia yellow monomers;

4) and adding sodium lignosulfonate into deionized water to be completely dissolved, mixing with the plant pigment stock solution after dissolving, and stirring for 30min under high shear to obtain the natural plant pigment.

Further, the content of active ingredients in the plant pigment stock solution is more than or equal to 30%, the content of sodium lignosulfonate accounts for more than or equal to 20% of the active ingredients of the natural plant pigment, and the adding amount of the natural plant pigment is 0.05-10% of the weight of the active ingredients of the natural plant pigment in the viscose stock solution.

Preferably, the addition amount of the sodium lignosulphonate is 20-30% of the effective components.

The beneficial effect of adopting the further scheme is that the addition amount can be properly adjusted according to different whiteness of the prepared cellulose fiber.

The invention adopts an organic solvent extraction method to obtain the plant pigment stock solution, and the content of the effective components is more than or equal to 30 percent. The preparation method of the common plant pigment also comprises purification steps such as refining and the like, but the invention does not need subsequent purification treatment, and the obtained plant pigment can be directly added into the viscose stock solution or the oiling step. Firstly, curcumin monomers and gardenia yellow monomers are alcohol-soluble compounds, most impurities of the curcumin monomers and gardenia yellow monomers are lipid substances, ethanol extraction is favorable for dissolving out the plant pigment monomers, the dielectric constant of an ethanol solution with the volume fraction of 70 percent is higher than that of other concentrations, ultrasonic extraction is carried out for 45min at 40 ℃, the purity of the plant pigment monomers already meets the use requirement, generally, petroleum ether is adopted for extraction for purification of the plant pigment, and the petroleum ether is not suitable for preparing high-cleanliness fibers for non-woven fabrics. Secondly, the spinning bath is followed by a spinning disk with a filter which filters impurities larger than 1 μm, so that it is not necessary to purify the phytochrome of the invention. On the basis, sodium lignosulfonate is dissolved with deionized water to prepare a solution, and then the solution is mixed and stirred with a plant pigment stock solution to obtain the natural plant pigment, wherein the content of active ingredients in the plant pigment stock solution is more than or equal to 30%, and the content of sodium lignosulfonate accounts for more than or equal to 20% of the active ingredients of the natural plant pigment.

Further, the plant material containing natural plant pigment comprises one or two of rhizome of Curcuma longa and fruit of Gardenia jasminoides Ellis; in the steps 1) and 2), the material-liquid ratio of the plant powder or the plant powder residue to the ethanol solution is 1g to 20 mL.

Further, the addition amount of the alkali lignin is 0.5-15% of the weight of the alpha cellulose in the viscose stock solution.

Furthermore, the dry strength of the cellulose fiber is more than or equal to 2.5cN/dtex, the wet strength is more than or equal to 1.1cN/dtex, and the whiteness is 30-60%.

Detailed Description

The principles and features of this invention are described below in conjunction with examples which are set forth to illustrate, but are not to be construed to limit the scope of the invention.

The invention firstly adopts the following steps to prepare the plant pigment stock solution:

1) freeze drying plant material containing natural plant pigment for 48 hr, pulverizing with pulverizer, and sieving to obtain plant powder; adding 70% ethanol solution into the plant powder, performing ultrasonic extraction at 40 deg.C for 45min, and filtering to obtain primary plant pigment extractive solution;

2) adding the plant powder residue filtered in the step 1) into an ethanol solution with the volume fraction of 70%, performing ultrasonic extraction again at 40 ℃ for 45min, filtering to obtain a secondary plant pigment extracting solution, and combining the two extracting solutions;

3) distilling and purifying the combined extracting solution obtained in the step 2) by a rotary evaporator to obtain a plant pigment stock solution, wherein the effective components in the plant pigment stock solution are one or two of curcumin monomers and gardenia yellow monomers.

The content of active ingredients in the plant pigment stock solution is more than or equal to 30 percent, and for the convenience of subsequent experiment calculation, the content of the active ingredients in the plant pigment stock solution is 30 percent as a conversion standard.

In addition, the plant material containing natural plant pigment comprises one or two of rhizome of Curcuma longa and fruit of Gardenia jasminoides Ellis, and different plant pigment stock solutions are obtained according to the plant material, such as curcumin stock solution obtained from rhizome of Curcuma longa and Gardenia jasminoides Ellis xanthate solution obtained from fruit of Gardenia jasminoides Ellis.