AU2020100084A4 - Method for preparing temperature-resistant and flame-retardant plant fiber paper by using sodium alginate - Google Patents
Method for preparing temperature-resistant and flame-retardant plant fiber paper by using sodium alginate Download PDFInfo
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- AU2020100084A4 AU2020100084A4 AU2020100084A AU2020100084A AU2020100084A4 AU 2020100084 A4 AU2020100084 A4 AU 2020100084A4 AU 2020100084 A AU2020100084 A AU 2020100084A AU 2020100084 A AU2020100084 A AU 2020100084A AU 2020100084 A4 AU2020100084 A4 AU 2020100084A4
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- plant fiber
- flame
- sodium alginate
- retardant
- resistant
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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
-
- 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
- D21F11/02—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines of the Fourdrinier type
-
- 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
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/20—Macromolecular organic compounds
- D21H17/21—Macromolecular organic compounds of natural origin; Derivatives thereof
- D21H17/24—Polysaccharides
- D21H17/30—Alginic acid or alginates
-
- 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
- D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
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Abstract
Abstract The present invention discloses a method for preparing a temperature-resistant and flame-retardant plant fiber paper by using sodium alginate, comprising the following steps of: adding sodium alginate to an aqueous dispersion solution of plant fiber, mixing uniformly to obtain mixed primary pulp, adding a calcium salt to the mixed primary pulp so that sodium alginate and calcium ions are crosslinked and cured to form calcium alginate so as to obtain crosslinked primary pulp, diluting and dispersing the crosslinked primary pulp, forming by wet dehydration, and squeezing and drying to obtain the temperature-resistant and flame-retardant plant fiber paper. The flame-retardant paper prepared by this method is free of any harmful flame retardant component and will not reduce the strength of the paper; and the paper is high in strength and good in toughness, can be used as an environmental-friendly, degradable, temperature-resistant and flame-retardant material, and has a wide range of applications.
Description
Technical Field
The present invention belongs to the technical field of temperature-resistant and flame-retardant paper production, and particularly relates to a method for preparing temperature-resistant and flame-retardant plant fiber paper by using sodium alginate. The present invention claims priority to Chinese Invention Patent No. 201910364425.3 filed on April 30, 2019.
Background Art
With the progress of society and the improvement of people's living standards, the awareness of environmental protection, safety and health is enhanced increasingly. As the most widely existing natural resource in the world, plant fiber has many advantages, such as renewability, degradability, environmental friendliness, no toxic or side effects, and relatively low cost. Composite materials of the plant fiber are more and more popular, and have been applied in more and more fields such as food baking, indoor decoration, industrial electroplating and automobile interior materials. However, due to low thermal stability and flammability of the plant fiber, the applications of plant fiber in many fields are limited, and many potential safety hazards are also caused.
At present, common methods for producing temperature-resistant paper-based materials mainly include the steps of: adding a temperature-resistant and flame-retardant additive to cellulosic fiber pulp or coating the temperature-resistant and flame-retardant additive on a surface of paper, and adding organic compounds such as halogen and phosphorus flame retardants, for example, decabromodiphenyl ethane, tetrabromobisphenol A and the like; adding inorganic flame retardant particles, for example, phosphorus pentoxide, magnesium hydroxide, aluminum hydroxide, borax and the like; and adding temperature-resistant fiber, for example, aluminum silicate fiber, aramid fiber and the like. However, these methods have certain limitations. In terms of the addition way, the addition of an inorganic flame retardant in the pulp will lead to a low retention rate and
2020100084 16 Jan 2020 seriously influence the strength of materials. By coating the surface with the flame retardant, it is very difficult to obtain paper-based materials with uniform temperature resistance and flame retardancy inside and outside. In terms of the type of the flame retardant, although halogen-containing organic flame retardants have good flame retardant effects, their toxicity and 5 non-degradability cannot be ignored. However, temperature-resistant synthetic fibers have the problems of high cost, low yield, non-degradability and the like at present. Therefore, it is very necessary to prepare a plant fiber paper-based material, which has the advantages of environmental friendliness and degradability of the plant fiber and also has good temperature resistance.
Summary of the Invention
In order to solve the defects inf the prior art, a first objective of the present invention is to provide a method for preparing a temperature-resistant and flame-retardant plant fiber paper by using sodium alginate. The flame-retardant paper prepared by this method is free of any harmful flame 15 retardant component and will not reduce the strength of the paper; and the paper is high in strength and good in toughness, can be used as an environmental-friendly, degradable, temperature-resistant and flame-retardant material, and has a wide range of applications.
A second objective of the present invention is to provide a temperature-resistant and flame-retardant plant fiber paper obtained by the method.
A third objective of the present invention is to provide an application of the temperature-resistant and flame-retardant plant fiber paper in temperature-resistant and flame-retardant materials.
To achieve the above objectives, the present invention employs the following technical solutions:
A method for preparing a temperature-resistant and flame-retardant plant fiber paper by using sodium alginate is provided, comprising the following steps of: adding sodium alginate to an 25 aqueous dispersion solution of plant fiber, mixing uniformly to obtain mixed primary pulp, adding a calcium salt to the mixed primary pulp so that sodium alginate and calcium ions are crosslinked and cured to form calcium alginate so as to obtain crosslinked primary pulp, diluting and dispersing the crosslinked primary pulp, forming by wet dehydration, and squeezing and drying to obtain the temperature-resistant and flame-retardant plant fiber paper.
Sodium alginate (SA) is a polysaccharide natural polymer material, and is a water-soluble linear
2020100084 16 Jan 2020 polysaccharide carbohydrate that is extracted from kelp of a phaeophyta type or sargassum and composed of l,4-poly-|l-D-mannuronic acid and α-L-guluronic acid. Sodium alginate is an alginic acid derivative extracted from brown kelp. At present, sodium alginate is mostly used in the food industry, but is also used in the pharmaceutical industry and dentistry. Researchers' interest in 5 sodium alginate mainly lies in unique colloid performance of sodium alginate, including film forming performance, biocompatibility, biological bonding performance and the like. It is to be particularly pointed out that sodium alginate can be crosslinked and cured with calcium ions in an aqueous solution of calcium salt to obtain calcium alginate, of which the formation process is a process of converting water-soluble sodium alginate into water-insoluble calcium alginate. After 10 bivalent calcium ions are bonded to carboxylic acid groups on adjacent alginate molecular chains, the calcium ions are surrounded between the adjacent molecular chains to form a structure similar to an egg box. Calcium alginate is a high-molecular carboxylate, which has high thermal stability due to the action of its macromolecules and calcium ions.
When calcium alginate is formed in an aqueous dispersion solution of the plant fiber, the 15 temperature resistance and flame retardancy can be improved; moreover, due to the presence of macromolecular chains, the plant fiber can be bonded closely, thereby preventing the reduction of paper strength.
In order to improve the mixing efficiency of sodium alginate and plant fiber, preferably, sodium alginate is prepared into a solution and then added to the aqueous dispersion solution of the plant 20 fiber. The plant fiber is prevented from affecting the dissolution rate of the sodium alginate and thus affecting the mixing efficiency of the sodium alginate and the plant fiber. Further preferably, the concentration of the sodium alginate solution is 4% to 10% (by mass).
Further preferably, the sodium alginate is prepared into a solution and then added to the aqueous dispersion solution of the plant fiber under the conditions of a temperature of 30 °C to 60 °C and 25 the time being 10 to 40 min. The stirring rate is 80 to 100 rpm.
Preferably, the addition amount of the sodium alginate is 10% to 30% of the mass of the plant fiber.
It has been found through experiments that a better effect is achieved in this range.
Preferably, the concentration of the aqueous dispersion solution of the plant fiber is 3% to 6% (by mass). It has been found through experiments that if the concentration is too low, the concentration 30 of drugs will be reduced and the modification effect is poor; and if the concentration is too high,
2020100084 16 Jan 2020 the fiber dispersion uniformity is reduced and the effect will be poor.
In order to improve the reaction efficiency of calcium ions and sodium alginate, preferably, the calcium salt is dissolved in water and then added to the mixed primary pulp. Further preferably, the concentration of the aqueous solution of the calcium salt is 10% to 20% (by mass).
Further preferably, the time for the sodium alginate and the calcium ions to undergo crosslinking and curing is 20 to 30 min.
Preferably, the mass ratio of the addition amount of the calcium salt to the addition amount of the sodium alginate is 0.9:1.1.
Preferably, the forming by wet dehydration is performed by a fourdrinier papermaking machine or 10 an inclined wire papermaking machine.
Further preferably, when the fourdrinier papermaking machine is adopted for forming, the material concentration is 0.05% to 0.5% (by mass). When the inclined wire papermaking machine is adopted for forming, the material concentration is 0.01% to 0.03% (by mass).
Preferably, the drying temperature is 105±5°C.
The present invention has the following beneficial effects:
(1) In the present invention, firstly, plant fiber is blended in a water system environment by using sodium alginate; then, by virtue of the crosslinking effect of a calcium salt, a plant fiber/calcium alginate network system with high thermal stability is prepared; and a temperature-resistant and flame-retardant paper is prepared by wet forming, drying and other processes.
(2) The temperature-resistant and flame-retardant plant fiber paper prepared by the process of the present invention uses natural and harmless components as raw materials, and is a temperature-resistant and flame-retardant plant fiber paper that is natural, environmentally friendly and degradable.
Detailed Description of the Invention
It is to be pointed out that the following detailed description is exemplary and intended to provide further explanation to the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as the common meanings interpreted by a person of ordinary skill in the art to which the present invention belongs.
It is to be noted that the terms used herein are merely for describing specific implementations, rather than limiting exemplary implementations of the present application. Unless otherwise specified in the context, as used herein, a singular form also includes a plural form. In addition, it should be understood that the term comprise and/or include, when used in this description, means the presence of features, steps, operations, devices, components and/or combinations thereof.
The plant fiber described in the present application is derived from fiber raw materials such as wood, bamboo and straw, and can be prepared into papermaking primary pulp such as wood pulp, bamboo pulp and straw pulp.
The calcium salt described in the present application refers to a compound that can be ionized to obtain calcium ions when it is dissolved in water, such as calcium chloride, calcium lactate, calcium sulfate or the like.
In order to enable those skilled in the art to understand the technical solutions of the present application more clearly, the technical solutions of the present application will be described below in detail in conjunction with specific embodiments and comparative examples.
Embodiment 1:
Softwood pulp fiber was dispersed to a concentration of 3%, sodium alginate having a concentration of 4% was added at a stirring speed of 80 rpm and a temperature of 30°C, and the mixture was stirred and mixed for 10 min, where the addition amount of the sodium alginate was 10% of the mass of the plant fiber. Then, a calcium chloride solution having a concentration of 10% was added, where the addition amount of the calcium chloride solution was 10% of the mass of the plant fiber, the stirring speed was 100 rpm and the time was 20 min; and the system was re-dispersed, then dehydrated and formed at a concentration of 0.01% by a fourdrinier papermaking machine, and squeezed and dried to obtain a flame-retardant plant fiber paper.
Embodiment 2:
Softwood pulp fiber was dispersed to a concentration of 4%, sodium alginate having a concentration of 7% was added at a stirring speed of 90 rpm and a temperature of 50°C, and the mixture was stirred and mixed for 30 min, where the addition amount of the sodium alginate was 20% of the mass of the plant fiber. Then, a calcium lactate solution having a concentration of 15% was added, where the addition amount of the calcium lactate solution was 20% of the mass of the plant fiber, the stirring speed was 130 rpm and the time was 25 min; and the system was
2020100084 16 Jan 2020 re-dispersed, then dehydrated and formed at a concentration of 0.3% by a fourdrinier papermaking machine, and squeezed and dried to obtain a flame-retardant plant fiber paper.
Embodiment 3:
Softwood pulp fiber was dispersed to a concentration of 6%, sodium alginate having a concentration of 10% was added at a stirring speed of 100 rpm and a temperature of 60°C, and the mixture was stirred and mixed for 40 min, where the addition amount of the sodium alginate was
30% of the mass of the plant fiber. Then, a calcium lactate solution having a concentration of 20% was added, where the addition amount of the calcium lactate solution was 30% of the mass of the plant fiber, the stirring speed was 160 rpm and the time was 30 min; and, the system was 10 re-dispersed, then dehydrated and formed at a concentration of 0.5% by a fourdrinier papermaking machine, and squeezed and dried to obtain a flame-retardant plant fiber paper.
Embodiment 4:
Softwood pulp fiber was dispersed to a concentration of 4%, sodium alginate having a concentration of 6% was added at a stirring speed of 90 rpm and a temperature of 50°C, and the 15 mixture was stirred and mixed for 30 min, where the addition amount of the sodium alginate was
20% of the mass of the plant fiber. Then, a calcium lactate solution having a concentration of 15% was added, where the addition amount of the calcium lactate solution was 20% of the mass of the plant fiber, the stirring speed was 130 rpm and the time was 25 min; and the system was re-dispersed, then dehydrated and formed at a concentration of 0.01% by an inclined wire 20 papermaking machine, and squeezed and dried to obtain a flame-retardant plant fiber paper.
Embodiment 5:
Softwood pulp fiber was dispersed to a concentration of 4%, sodium alginate having a concentration of 6% was added at a stirring speed of 90 rpm and a temperature of 50°C, and the mixture was stirred and mixed for 30 min, where the addition amount of the sodium alginate was 25 20% of the mass of the plant fiber. Then, a calcium salt solution having a concentration of 15% was added (the ratio of calcium chloride to calcium lactate was 1:1), where the addition amount of the calcium salt solution was 20% of the mass of the plant fiber, the stirring speed was 130 rpm and the time was 25 min; and the system was re-dispersed, then dehydrated and formed at a concentration of 0.01% by an inclined wire papermaking machine, and squeezed and dried to 30 obtain a flame-retardant plant fiber paper.
2020100084 16 Jan 2020
Embodiment 6:
Softwood pulp fiber was dispersed to a concentration of 4% and stirred and mixed at a stirring speed of 90 rpm and a temperature of 50°C for 30 min; and then the system was re-dispersed, then formed at a concentration of 0.01% by an inclined wire papermaking machine, and squeezed and 5 dried to obtain a plant fiber paper.
Performance indexes of samples in embodiments
| Embodiment | Tensile index (N.m/g) | Burst index (KPa.m2/g) | Oxygen index |
| 1 | 10.25 | 2.12 | 26 |
| 2 | 12.56 | 3.26 | 28 |
| 3 | 15.45 | 4.10 | 30 |
| 4 | 12.05 | 3.01 | 26 |
| 5 | 12.30 | 3.15 | 27 |
| 6 | 7.12 | 1.25 | 19 |
The foregoing description merely shows preferred embodiments of the present application and is not intended to limit the present invention. Various alterations and variations can be made to the present application by those skilled in the art. Any modification, equivalent replacement, 10 improvement and the like made without departing from the spirit and principle of the present application shall fall into the protection scope of the present application.
Claims (10)
1. A method for preparing a temperature-resistant and flame-retardant plant fiber paper by using sodium alginate, comprising the following steps of: adding sodium alginate to an aqueous dispersion solution of plant fiber, mixing uniformly to obtain mixed primary pulp, adding a calcium salt to the mixed primary pulp so that sodium alginate and calcium ions are crosslinked and cured to form calcium alginate so as to obtain crosslinked primary pulp, diluting and dispersing the crosslinked primary pulp, forming by wet dehydration, and squeezing and drying to obtain the temperature-resistant and flame-retardant plant fiber paper.
2. The method according to claim 1, characterized in that the sodium alginate is prepared into a solution and then added to the aqueous dispersion solution of the plant fiber.
3. The method according to claim 1, characterized in that the addition amount of the sodium alginate is 10% to 30% of the mass of the plant fiber.
4. The method according to claim 1, characterized in that the concentration of the aqueous dispersion solution of the plant fiber is 3% to 6%.
5. The method according to claim 1, characterized in that the calcium salt is dissolved in water and then added to the mixed primary pulp.
6. The method according to claim 5, characterized in that the time for the sodium alginate and the calcium ions to undergo crosslinking and curing is 20 to 30 min.
7. The method according to claim 1, characterized in that the mass ratio of the addition amount of the calcium salt to the addition amount of the sodium alginate is 0.9:1.1.
8. The method according to claim 1, characterized in that the forming by wet dehydration is performed by a fourdrinier papermaking machine or an inclined wire papermaking machine; preferably, when the fourdrinier papermaking machine is adopted for forming, the material concentration is 0.05% to 0.5% (by mass); and when the inclined wire papermaking machine is adopted for forming, the material concentration is 0.01% to 0.03% (by mass).
9. A temperature-resistant and flame-retardant plant fiber paper obtained by the method according to any of claims 1 to 8.
10. An application of the temperature-resistant and flame-retardant plant fiber paper according to
2020100084 16 Jan 2020 claim 9 in a temperature-resistant and flame-retardant material.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910364425.3A CN110172864B (en) | 2019-04-30 | 2019-04-30 | Method for preparing plant fiber temperature-resistant flame-retardant paper by using sodium alginate |
| CN201910364425.3 | 2019-04-30 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| AU2020100084A4 true AU2020100084A4 (en) | 2020-02-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AU2020100084A Ceased AU2020100084A4 (en) | 2019-04-30 | 2020-01-16 | Method for preparing temperature-resistant and flame-retardant plant fiber paper by using sodium alginate |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN110172864B (en) |
| AU (1) | AU2020100084A4 (en) |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103937023B (en) * | 2014-04-04 | 2016-05-11 | 青岛大学 | A kind of preparation method of light body calcium alginate base cavernous body functional material |
| CN103937039B (en) * | 2014-04-04 | 2016-04-13 | 青岛大学 | A kind of preparation method of alginate calcium base cavernous body functional materials |
| CN105133415B (en) * | 2015-07-09 | 2017-04-12 | 东岚高科(青岛)有限公司 | Environmentally-friendly marine organism base flame retardation paper and production method thereof |
| CN108425245B (en) * | 2018-04-08 | 2020-08-14 | 美雅(龙南)服饰有限公司 | Preparation method of flame-retardant cotton fiber |
| CN109162096B (en) * | 2018-08-31 | 2021-01-26 | 山东绿纤工程设计有限公司 | Method for preparing flame-retardant Lyocell cellulose fiber based on post-treatment method |
| CN109267318B (en) * | 2018-09-17 | 2021-12-17 | 山东绿纤工程设计有限公司 | Flame-retardant lyocell fiber and preparation method thereof |
-
2019
- 2019-04-30 CN CN201910364425.3A patent/CN110172864B/en active Active
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2020
- 2020-01-16 AU AU2020100084A patent/AU2020100084A4/en not_active Ceased
Also Published As
| Publication number | Publication date |
|---|---|
| CN110172864A (en) | 2019-08-27 |
| CN110172864B (en) | 2021-12-31 |
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