CN109881527B - Flame-retardant secondary fiber and preparation method and application thereof - Google Patents
Flame-retardant secondary fiber and preparation method and application thereof Download PDFInfo
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Abstract
The invention relates to a flame-retardant secondary fiber, a preparation method and application thereof, and relates to the field of flame-retardant materials. Adding secondary fiber pulp and persulfate into a reactor according to a ratio, heating to 80-90 ℃, stirring for 0.5-1.5 h, then adding melamine polyphosphate into the reactor, continuously stirring for 12-15 h at a constant temperature of 80-90 ℃, taking out the fiber after the reaction is finished, and finally washing the pulp to obtain the flame-retardant secondary fiber. According to the invention, the flame retardant and the components in the secondary fiber are subjected to a grafting reaction, so that the secondary fiber is endowed with a long-term and lasting flame retardant effect. The flame-retardant secondary fiber can be used for preparing flame-retardant kraft liner boards, and can improve the physical strength of the kraft liner boards while ensuring the flame retardance of the kraft liner boards. In addition, the invention has simple process and low production cost, and the waste liquid after the flame-retardant grafting modification can be used for preparing the flame-retardant surface sizing solution, thereby not causing new environmental pollution and having wide market application prospect.
Description
Technical Field
The invention relates to the field of flame-retardant materials, in particular to a flame-retardant secondary fiber and a preparation method and application thereof.
Background
In modern commodity trade, the packaging material plays an important role in the preservation, beautification and protection of commodities, wherein the corrugated packaging cartons account for about 37 percent of the world packaging material. The corrugated case industry in China has rapidly developed in recent years, and the output value of the corrugated case industry in China in 2017 reaches 3924.73 billion yuan. With the rapid updating speed of various products, zero stock management and rapid logistics become rigid requirements, which promote the rapid development of the corrugated case industry. The continuous and rapid development of industries such as electronic commerce and the like also supports the development of the corrugated carton industry. According to statistics of relevant departments, the number of expressage products exceeds 206 hundred million in 2015 in China, and the expressage products are stably kept in the first world; in 2017, the service volume of the national express service enterprises is accumulated to complete 400.6 hundred million express services, and the service volume is increased by 28 percent on year-by-year basis. The kraft liner boards for various packaging cartons of the prior art are generally made of waste paper, and are not subjected to flame retardant treatment under most conditions. At present, the flame retardant technology is only used for a small amount of high-grade packaging cartons or special products, such as export products, a small amount of high-grade consumer goods, flammable and explosive products, military products and the like. The common paper boxes are not subjected to flame retardant treatment, which is a hidden danger, fire disasters occur in the transportation or storage of the packaging paper boxes, and the flame retardant treatment of the kraft paper boards for the packaging paper boxes is an inevitable requirement along with the social progress and the improvement of the living requirements of people.
The invention aims to solve the problem of flame retardance of secondary fibers (waste paper). As is well known, plant fiber is a flammable substance, and kraft boxes for manufacturing packaging cartons are generally produced from secondary fibers (waste paper), and the nature of the plant fiber is various plant fibers such as wood pulp fiber, straw pulp fiber and the like, so the plant fiber is a flammable material, is a flammable material causing fire, and is always the key point of fire fighting. The fire-retardant treatment of the secondary fiber (waste paper) can reduce the hidden danger of fire hazard of the packing carton, delay the spreading speed or trend of flame and reduce casualties and property loss in the fire. The flame-retardant treated kraft liner board is generally difficult to ignite or has long ignition time, can inhibit the propagation of flame, has low heat release rate, and can be automatically extinguished or the flash time can be prolonged, so that more time is provided for evacuation of people, rescue of property and the like. Flame retardancy is therefore an essential important property for the manufacture of kraft liner board for packaging.
The present application has been made for the above reasons.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a flame-retardant secondary fiber and a preparation method and application thereof.
In order to achieve the purpose, the invention adopts the technical scheme that:
a method of making a flame retardant secondary fiber, the method comprising the steps of:
adding secondary fiber pulp and persulfate initiator into a reactor according to a ratio, heating to 80-90 ℃, stirring for 0.5-1.5 h, then adding melamine polyphosphate into the reactor, continuously stirring for 12-15 h at a constant temperature of 80-90 ℃, taking out the fiber after the reaction is finished, and finally washing the pulp to obtain the graft modified flame-retardant secondary fiber.
Further, according to the technical scheme, the secondary fiber pulp is prepared from domestic old corrugated case waste paper (OCC) and American old corrugated case waste paper (AOCC) serving as raw materials.
Preferably, in the technical scheme, the concentration of the secondary fiber pulp is 3-5 wt%, and the beating degree is 30-35 DEG SR.
Preferably, in the above technical solution, the secondary fiber pulp is prepared by the following method:
OCC raw material and AOCC raw material are pulped, purified, screened and concentrated, and then are mixed and ground into pulp by 1 row and 2 series of conical pulping machines.
Preferably, in the technical scheme, the mass part ratio of the OCC, the AOCC, the persulfate and the melamine polyphosphate is 1: 0.2-0.5: 0.02-0.04: 0.2 to 0.4.
Further, according to the above technical scheme, the persulfate may be any one of sodium persulfate, potassium persulfate, or ammonium persulfate.
The second purpose of the invention is to provide the flame-retardant secondary fiber prepared by the preparation method of the flame-retardant secondary fiber.
The third purpose of the invention is to provide the application of the flame-retardant secondary fiber prepared by the method, which can be used for preparing flame-retardant kraft liner boards.
Compared with the prior art, the flame-retardant secondary fiber and the preparation method and application thereof have the following beneficial effects:
(1) the flame-retardant kraft liner board disclosed by the invention utilizes a reactive flame-retardant principle (rather than an additive type), adopts the reactive flame retardant melamine polyphosphate, and truly becomes a part of the secondary fiber through the graft reaction of the flame retardant and the components in the secondary fiber to prepare the flame-retardant secondary fiber, so that the long-lasting flame-retardant effect of the secondary fiber and the flame-retardant durability of the flame-retardant kraft liner board prepared from the secondary fiber are endowed.
(2) When the flame-retardant secondary fiber prepared by the method is used for preparing the flame-retardant kraft liner board, the combination among fibers cannot be influenced in the papermaking process, so that the flame retardance is ensured, and the physical strength of the kraft liner board is not influenced; moreover, the melamine polyphosphate also has a certain crosslinking effect, and can improve the physical strength of the kraft liner board, so that the kraft liner board prepared from the flame-retardant secondary fiber has good flame retardance and excellent physical strength.
(3) The method has simple process and low production cost, and the waste liquid after the flame-retardant grafting modification can be used for preparing the flame-retardant surface sizing solution, so the method does not cause new environmental pollution and has wider market prospect.
Drawings
FIG. 1 is a flow chart of a process for preparing the flame-retardant secondary fiber of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the following embodiments and accompanying drawings. The present invention is implemented on the premise of the technology of the present invention, and the detailed embodiments and specific procedures are given to illustrate the inventive aspects of the present invention, but the scope of the present invention is not limited to the following embodiments.
Various modifications to the precise description of the invention will be readily apparent to those skilled in the art from the information contained herein without departing from the spirit and scope of the appended claims. It is to be understood that the scope of the invention is not limited to the procedures, properties, or components defined, as these embodiments, as well as others described, are intended to be merely illustrative of particular aspects of the invention. Indeed, various modifications of the embodiments of the invention which are obvious to those skilled in the art or related fields are intended to be covered by the scope of the appended claims.
For a better understanding of the invention, and not as a limitation on the scope thereof, all numbers expressing quantities, percentages, and other numerical values used in this application are to be understood as being modified in all instances by the term "about". Accordingly, unless expressly indicated otherwise, the numerical parameters set forth in the specification and attached claims are approximations that may vary depending upon the desired properties sought to be obtained. At the very least, each numerical parameter should at least be construed in light of the number of reported significant digits and by applying ordinary rounding techniques.
Example 1
The preparation method of the flame-retardant secondary fiber comprises the following steps:
(1) mixing the components in a mass ratio of 1: 0.2 of domestic old corrugated container waste paper (OCC) and American old corrugated container waste paper (AOCC) are pulped by a hydrapulper, high-concentration deslagging is carried out, then coarse screening, fine screening and thickener concentration treatment are carried out, 1 row and 2 rows of conical pulping machines are used for series connection mixed pulping, secondary fiber pulp with the concentration of 3 percent and the pulping degree of 30 DEG SR is obtained, and the secondary fiber pulp is stored in a pulping tank for standby;
(2) adding the secondary fiber pulp obtained in the step (1) and ammonium persulfate into a reactor, heating to 80 ℃, stirring for 1.5h, then adding melamine polyphosphate into the reactor, continuously stirring for 15h at constant temperature of 80 ℃, taking out the fiber after the reaction is finished, and finally washing the pulp to obtain the graft-modified flame-retardant secondary fiber, wherein: the mass ratio of the OCC raw material to the AOCC raw material to the ammonium persulfate to the melamine polyphosphate is 1: 0.2: 0.02: 0.2.
example 2
The preparation method of the flame-retardant secondary fiber comprises the following steps:
(1) mixing the components in a mass ratio of 1: 0.3 of domestic old corrugated container waste paper (OCC) and American old corrugated container waste paper (AOCC) are pulped by a hydrapulper, high-concentration deslagging is carried out, then coarse screening, fine screening and thickener concentration treatment are carried out, 1 row and 2 rows of conical pulping machines are used for series connection mixed pulping, secondary fiber pulp with the concentration of 4 percent and the pulping degree of 32 DEG SR is obtained, and the secondary fiber pulp is stored in a pulping tank for standby;
(2) adding the secondary fiber pulp obtained in the step (1) and potassium persulfate into a reactor, heating to 80 ℃, stirring for 1.5h, then adding melamine polyphosphate into the reactor, continuously stirring for 13h at constant temperature of 85 ℃, taking out the fiber after the reaction is finished, and finally washing the pulp to obtain the graft-modified flame-retardant secondary fiber, wherein: the mass ratio of the OCC raw material to the AOCC raw material to the potassium persulfate to the melamine polyphosphate is 1: 0.3: 0.03: 0.3.
example 3
The preparation method of the flame-retardant secondary fiber comprises the following steps:
(1) mixing the components in a mass ratio of 1: 0.4 of domestic old corrugated container waste paper (OCC) and American old corrugated container waste paper (AOCC) are pulped by a hydrapulper, high-concentration deslagging is carried out, then coarse screening, fine screening and thickener concentration treatment are carried out, 1 row and 2 rows of conical pulping machines are used for series connection mixed pulping, secondary fiber pulp with the concentration of 5 percent and the pulping degree of 30 DEG SR is obtained, and the secondary fiber pulp is stored in a pulping tank for standby;
(2) adding the secondary fiber pulp obtained in the step (1) and ammonium persulfate into a reactor, heating to 86 ℃, stirring for 1h, then adding melamine polyphosphate into the reactor, continuously stirring for 15h at constant temperature of 86 ℃, taking out the fiber after the reaction is finished, and finally washing the pulp to obtain the graft-modified flame-retardant secondary fiber, wherein: the mass ratio of the OCC raw material to the AOCC raw material to the ammonium persulfate to the melamine polyphosphate is 1: 0.4: 0.025: 0.25.
example 4
The preparation method of the flame-retardant secondary fiber comprises the following steps:
(1) mixing the components in a mass ratio of 1: 0.5 of domestic old corrugated container waste paper (OCC) and American old corrugated container waste paper (AOCC) are pulped by a hydrapulper, high-concentration deslagging is carried out, then coarse screening, fine screening and thickener concentration treatment are carried out, 1 row and 2 rows of conical pulping machines are used for series connection mixed pulping, secondary fiber pulp with the concentration of 3 percent and the pulping degree of 35 DEG SR is obtained, and the secondary fiber pulp is stored in a pulping tank for standby;
(2) adding the secondary fiber pulp obtained in the step (1) and sodium persulfate into a reactor, heating to 90 ℃, stirring for 0.5h, then adding melamine polyphosphate into the reactor, continuously stirring at constant temperature of 90 ℃ for 12h, taking out the fiber after the reaction is finished, and finally washing the pulp to obtain the graft-modified flame-retardant secondary fiber, wherein: the mass ratio of the OCC raw material to the AOCC raw material to the sodium persulfate to the melamine polyphosphate is 1: 0.5: 0.04: 0.4.
application example 1
The flame-retardant secondary fiber prepared in example 1 is used for preparing a flame-retardant kraft liner board, and the preparation method of the flame-retardant kraft liner board comprises the following steps:
(1) adding a polyacrylamide (CPAM) reinforcing agent and a retention dehydration promoter into the flame-retardant secondary fiber according to the proportion to obtain pulp for papermaking;
wherein: the mass ratio of the flame-retardant secondary fiber to the reinforcing agent is 1: 0.002;
the retention dehydration accelerant consists of polydiallylammonium chloride, a cationic starch/bentonite compound and a composite microbial enzyme, wherein the composite microbial enzyme is prepared from the following components in percentage by mass of 1: 1, degrading surface fiber to remove part of fine fiber, increasing the gap of wet paper sheet and speeding up the water filtering speed of wet paper sheet on the paper machine net. The mass ratio of the flame-retardant secondary fiber, the polydiallylammonium chloride, the cationic starch/bentonite compound and the composite microbial enzyme is 1: 0.0005: 0.008: 0.00003; the mass ratio of the cationic starch to the bentonite in the cationic starch/bentonite compound is 1: 0.4.
(2) feeding the slurry obtained in the step (1) to a net part of a net folding paper machine through a feeding system to be made into wet paper sheets, and carrying out surface sizing treatment after squeezing and drying; the surface sizing amount is 3 percent (corresponding to the weight of paper, namely the weight of the flame-retardant secondary fiber), and the sizing concentration is 8 percent; after sizing, drying the mixture by a drying cylinder at 100 ℃, and then carrying out soft calendaring to obtain the flame-retardant kraft liner board;
the soft calendaring process specifically adopts a double-roller soft calendaring technology;
the formula of the surface sizing agent comprises the following components: the surface sizing agent consists of cationic starch, styrene-acrylate copolymer and graft-modified waste liquid (containing melamine polyphosphate). The mass ratio of the flame-retardant secondary fiber to the cationic starch to the styrene-acrylate copolymer to the waste liquid after graft modification is as follows: 1: 0.01: 0.01: 0.1.
application example 2
The flame-retardant secondary fiber prepared in example 2 is used for preparing a flame-retardant kraft liner board, and the preparation method of the flame-retardant kraft liner board comprises the following steps:
(1) adding a polyacrylamide (CPAM) reinforcing agent and a retention dehydration promoter into the flame-retardant secondary fiber according to the proportion to obtain pulp for papermaking;
wherein: the mass ratio of the flame-retardant secondary fiber to the reinforcing agent is 1: 0.003;
the retention dehydration accelerant consists of polydiallylammonium chloride, a cationic starch/bentonite compound and a composite microbial enzyme, wherein the composite microbial enzyme is prepared from the following components in percentage by mass of 1: 2, degrading surface fiber to remove part of fine fiber, increasing the gap of wet paper sheet and speeding up the water filtering speed of wet paper sheet on the paper machine net. The mass ratio of the flame-retardant secondary fiber, the polydiallylammonium chloride, the cationic starch/bentonite compound and the composite microbial enzyme is 1: 0.0008: 0.01: 0.00004; the mass ratio of the cationic starch to the bentonite in the cationic starch/bentonite compound is 1: 0.5.
(2) feeding the slurry obtained in the step (1) to a net part of a net folding paper machine through a feeding system to be made into wet paper sheets, and carrying out surface sizing treatment after squeezing and drying; the surface sizing amount is 4% (corresponding to the weight of paper, namely the weight of the flame-retardant secondary fiber), and the sizing concentration is 9%; after sizing, drying the mixture by a drying cylinder at 100 ℃, and then carrying out soft calendaring to obtain the flame-retardant kraft liner board;
the soft calendaring process specifically adopts a double-roller soft calendaring technology;
the formula of the surface sizing agent comprises the following components: the surface sizing agent consists of cationic starch, styrene-acrylate copolymer and graft-modified waste liquid (containing melamine polyphosphate). The mass ratio of the flame-retardant secondary fiber to the cationic starch to the styrene-acrylate copolymer to the waste liquid after graft modification is 1: 0.015: 0.015: 0.15.
application example 3
The flame-retardant secondary fiber prepared in example 3 is used for preparing a flame-retardant kraft liner board, and the preparation method of the flame-retardant kraft liner board comprises the following steps:
(1) adding a polyacrylamide (CPAM) reinforcing agent and a retention dehydration promoter into the flame-retardant secondary fiber according to the proportion to obtain pulp for papermaking;
wherein: the mass ratio of the flame-retardant secondary fiber to the reinforcing agent is 1: 0.004;
the retention dehydration accelerant consists of polydiallylammonium chloride, a cationic starch/bentonite compound and a composite microbial enzyme, wherein the composite microbial enzyme is prepared from the following components in percentage by mass of 1: 1, degrading surface fiber to remove part of fine fiber, increasing the gap of wet paper sheet and speeding up the water filtering speed of wet paper sheet on the paper machine net. The mass ratio of the flame-retardant secondary fiber, the polydiallylammonium chloride, the cationic starch/bentonite compound and the composite microbial enzyme is 1: 0.001: 0.012: 0.00005; the mass ratio of the cationic starch to the bentonite in the cationic starch/bentonite compound is 1: 0.8.
(2) feeding the slurry obtained in the step (1) to a net part of a net folding paper machine through a feeding system to be made into wet paper sheets, and carrying out surface sizing treatment after squeezing and drying; the surface sizing amount is 5 percent (corresponding to the weight of paper, namely the weight of the flame-retardant secondary fiber), and the sizing concentration is 10 percent; after sizing, drying the mixture by a 120 ℃ drying cylinder, and then carrying out soft calendaring to obtain the flame-retardant kraft liner board;
the soft calendaring process specifically adopts a double-roller soft calendaring technology;
the formula of the surface sizing agent comprises the following components: the surface sizing agent consists of cationic starch, styrene-acrylate copolymer and graft-modified waste liquid (containing melamine polyphosphate). The mass ratio of the flame-retardant secondary fiber to the cationic starch to the styrene-acrylate copolymer to the waste liquid after graft modification is 1: 0.02: 0.02: 0.2.
application example 4
The flame-retardant secondary fiber prepared in example 4 is used for preparing a flame-retardant kraft liner board, and the preparation method of the flame-retardant kraft liner board comprises the following steps:
(1) adding a polyacrylamide (CPAM) reinforcing agent and a retention dehydration promoter into the flame-retardant secondary fiber according to the proportion to obtain pulp for papermaking;
wherein: the mass ratio of the flame-retardant secondary fiber to the reinforcing agent is 1: 0.0025;
the retention dehydration accelerant consists of polydiallylammonium chloride, cationic starch/bentonite and composite microbial enzyme, wherein the composite microbial enzyme is prepared from the following components in percentage by mass: 1, degrading surface fiber to remove part of fine fiber, increasing the gap of wet paper sheet and speeding up the water filtering speed of wet paper sheet on the paper machine net. The mass ratio of the flame-retardant secondary fiber, the polydiallylammonium chloride, the cationic starch/bentonite compound and the composite microbial enzyme is 1: 0.0008: 0.009: 0.000045, respectively; the mass ratio of the cationic starch to the bentonite in the cationic starch/bentonite compound is 1: 0.55.
(22) feeding the slurry obtained in the step (21) to a net part of a net folding paper machine through a feeding system for papermaking to form a wet paper sheet, and performing surface sizing treatment after pressing and drying; the surface sizing amount was 3.5% (corresponding to the weight of paper, i.e. the weight of flame-retardant secondary fibers), and the sizing concentration was 8%; after sizing, drying the mixture by a drying cylinder at 100 ℃, and then carrying out soft calendaring to obtain the flame-retardant kraft liner board;
the soft calendaring process specifically adopts a double-roller soft calendaring technology;
the formula of the surface sizing agent comprises the following components: the surface sizing agent consists of cationic starch, styrene-acrylate copolymer and graft-modified waste liquid (containing melamine polyphosphate). The mass ratio of the flame-retardant secondary fiber to the cationic starch to the styrene-acrylate copolymer to the waste liquid after graft modification is 1: 0.015: 0.015: 0.15.
the main performance indexes of the flame-retardant kraft liner boards prepared in application examples 1 to 4 were tested. The flame retardance is tested by adopting an oxygen index instrument according to the ASTM D2863 oxygen index test standard; the stiffness is tested according to the standard GB/T22364 + 2008 'determination of bending stiffness of paper and paperboard'; the burst index is tested according to the standard GB/T454-2002 'determination of paper burst strength'; the breaking length was measured according to GB-T12914-2008 "determination of tensile Strength of paper and paperboard" standards, and the results are shown in Table 1.
Table 1 main performance index test result table of flame retardant kraft liner board manufactured by application examples 1 to 4
| Technical index | Example 1 | Example 2 | Example 3 | Example 4 |
| Quantitative g/m2 | 80 | 90 | 84 | 86 |
| Stiffness mN.m | 1.1 | 1.2 | 1.15 | 1.6 |
| Burst index Kpa m2/g | 2.1 | 2.3 | 2.24 | 2.18 |
| Fracture length km | 3.5 | 3.8 | 3.7 | 3.6 |
| Flame retardancy (% limiting oxygen index) | 27.2 | 28.9 | 27.5 | 28.5 |
The results in table 1 show that the flame-retardant kraft liner board prepared from the flame-retardant secondary fiber of the invention has good and durable flame retardance, no halogen, no toxicity and good physical strength, and the waste liquid after grafting modification of the invention is used for preparing the flame-retardant surface sizing solution, so that the process is simple, pollution-free, low in production cost and has wider market prospect.
Claims (6)
1. A preparation method of flame-retardant secondary fiber is characterized by comprising the following steps: the method comprises the following steps:
adding secondary fiber pulp and persulfate initiator into a reactor according to a ratio, heating to 80-90 ℃, stirring for 0.5-1.5 h, then adding melamine polyphosphate into the reactor, continuously stirring for 12-15 h at a constant temperature of 80-90 ℃, taking out the fiber after the reaction is finished, and finally washing the pulp to obtain the graft modified flame-retardant secondary fiber; wherein: the secondary fiber pulp is prepared by using domestic old corrugated case waste paper OCC and American old corrugated case waste paper AOCC as raw materials; the mass part ratio of OCC, AOCC, persulfate and melamine polyphosphate is 1: 0.2-0.5: 0.02-0.04: 0.2 to 0.4.
2. The method for preparing a flame-retardant secondary fiber according to claim 1, characterized in that: the concentration of the secondary fiber pulp is 3-5 wt%, and the beating degree is 30-35°SR。
3. The method for preparing a flame-retardant secondary fiber according to claim 1, characterized in that: the secondary fiber pulp is prepared by adopting the following method:
OCC raw material and AOCC raw material are pulped, purified, screened and concentrated, and then are mixed and ground into pulp by 1 row and 2 series of conical pulping machines.
4. The method for preparing a flame-retardant secondary fiber according to claim 1, characterized in that: the persulfate is any one of sodium persulfate, potassium persulfate or ammonium persulfate.
5. The flame-retardant secondary fiber prepared by the method for preparing the flame-retardant secondary fiber according to any one of claims 1 to 4.
6. The use of the flame-retardant secondary fiber prepared by the method of any one of claims 1 to 4, wherein: the flame-retardant secondary fiber can be used for preparing flame-retardant kraft liner boards.
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| CN105862490A (en) * | 2016-04-05 | 2016-08-17 | 华南理工大学 | Environment-friendly type flame retardant paper and preparation method thereof |
| CN107022804A (en) * | 2017-03-17 | 2017-08-08 | 宁波三邦超细纤维有限公司 | Fire-retardant degradable antibacterial polylactic acid elastomer and preparation method thereof |
| CN108556447A (en) * | 2018-04-04 | 2018-09-21 | 东莞顺裕纸业有限公司 | A kind of fire-retardant brown paper |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105862490A (en) * | 2016-04-05 | 2016-08-17 | 华南理工大学 | Environment-friendly type flame retardant paper and preparation method thereof |
| CN107022804A (en) * | 2017-03-17 | 2017-08-08 | 宁波三邦超细纤维有限公司 | Fire-retardant degradable antibacterial polylactic acid elastomer and preparation method thereof |
| CN108556447A (en) * | 2018-04-04 | 2018-09-21 | 东莞顺裕纸业有限公司 | A kind of fire-retardant brown paper |
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