CN111763385A - High-moisture-absorption flame-retardant pearl cotton and preparation method thereof - Google Patents

High-moisture-absorption flame-retardant pearl cotton and preparation method thereof Download PDF

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CN111763385A
CN111763385A CN202010620131.5A CN202010620131A CN111763385A CN 111763385 A CN111763385 A CN 111763385A CN 202010620131 A CN202010620131 A CN 202010620131A CN 111763385 A CN111763385 A CN 111763385A
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parts
fiber
mixed
agent
mixture
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罗南坤
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Dongguan Xiehao Plastic Packaging Products Co ltd
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Dongguan Xiehao Plastic Packaging Products Co ltd
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    • C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
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Abstract

The invention provides high-moisture-absorption flame-retardant pearl wool, which comprises the following raw materials: 70-80 parts of ethylene, 160 parts of butene copolymer 130-one, 10-19 parts of titanate modified calcium carbonate, 15-20 parts of polyvinyl acetate, 12-15 parts of isooctyl acrylate, 1-3 parts of auxiliary agent, 3-8 parts of mixed fiber, 3-10 parts of dispersing agent, 3-10 parts of antistatic agent, 10-20 parts of foaming agent and 5-10 parts of talcum powder. The invention adopts the mixture of the argil and the light calcium carbonate with the weight part ratio of 1:2-3, improves the thermal stability and the flame retardant effect of the material, and has good promotion effect on the mechanical property of the pearl wool.

Description

High-moisture-absorption flame-retardant pearl cotton and preparation method thereof
Technical Field
The invention belongs to the technical field of polymer preparation, and particularly relates to high-moisture-absorption flame-retardant pearl cotton and a preparation method thereof.
Background
The pearl cotton, also called polyethylene foam cotton, is a non-crosslinked closed-cell structure, EPE for short, is a novel environment-friendly packaging material, is formed by innumerable independent bubbles generated by physically foaming low-density polyethylene ester, overcomes the defects of fragility, deformation and poor recovery of common foam rubber, has the advantages of water resistance, moisture resistance, shock resistance, sound insulation, heat preservation, good plasticity, strong toughness, cyclic reconstruction, environmental protection, strong impact resistance and the like, also has good chemical resistance, and is an ideal substitute of the traditional packaging material. However, for some electronic materials which are particularly sensitive to humidity, the antistatic performance is required to be high, the requirements on the performance of moisture resistance and the like are also high, water is not generated in the product, most of the air entering the packaging material during packaging has certain moisture, and the special increase of the bagged moisture-proof agent not only increases manual operation, but also causes waste of the moisture-absorbing material.
The Chinese patent application 201410151680.7 discloses a moisture-absorbing and anti-seepage pearl cotton which is formed by compounding a surface moisture-absorbing layer, a middle protective layer and a back waterproof layer, increases the production cost and is not beneficial to the popularization of products.
At present, the pearl cotton with flame retardant and moisture absorption functions can not be processed and formed once, and the inventor of the present invention has invented the pearl cotton with high moisture absorption and flame retardant and the preparation method thereof after long-term research.
Disclosure of Invention
The invention aims to provide high-moisture-absorption flame-retardant pearl wool and a preparation method thereof aiming at the characteristic that the flame retardance and the moisture absorption performance are not combined in the prior art.
In order to achieve the purposes, the specific scheme is as follows:
the highly hygroscopic and flame-retardant pearl wool comprises the following raw materials: 70-80 parts of ethylene, 160 parts of butene copolymer 130-one, 10-19 parts of titanate modified calcium carbonate, 15-20 parts of polyvinyl acetate, 12-15 parts of isooctyl acrylate, 1-3 parts of auxiliary agent, 3-8 parts of mixed fiber, 3-10 parts of dispersing agent, 3-10 parts of antistatic agent, 10-20 parts of foaming agent and 5-10 parts of talcum powder.
The auxiliary agent is a mixture of argil and light calcium carbonate, and the weight part ratio of the argil to the light calcium carbonate is 1: 2-3.
The mixed fiber is formed by mixing bamboo fiber and soybean protein fiber, and the weight part ratio of the bamboo fiber to the soybean protein fiber is 3-5: 1.
The mixed fiber is subjected to ultrasonic treatment, and the specific treatment mode is as follows: treating the mixed bamboo fiber and soybean protein fiber with the weight ratio of 1:1 for 2-5min by ultrasonic wave, freezing at-10 deg.C for 30-50min, adding the rest bamboo fiber, and continuing ultrasonic treatment for 2-5 min.
The dispersant is sodium lignosulfonate.
The antistatic agent is a mixture of glycerol ethylene distearamide and polybenzimidazole, and comprises the following components in parts by weight: 1: 5-8.
The foaming agent is butane and azodicarbonamide according to the weight portion ratio of 1: 1-2.
A highly hygroscopic and flame retardant pearl wool is prepared by the following steps:
a. putting ethylene, a butylene copolymer, titanate modified calcium carbonate and calcium stearate into a reaction kettle to perform high-pressure compression polymerization reaction;
b. removing unreacted ethylene from the product obtained in the step a by using a separator, then carrying out melt extrusion and drying to obtain low-density polyethylene;
c. placing the auxiliary agent into a crushing device of a superfine crusher for mixing and crushing, and screening to obtain a superfine crushed mixture with the particle size of 280-320 meshes;
d. placing low-density polyethylene, polyvinyl acetate and isooctyl acrylate into a reaction kettle, raising the temperature of the reaction kettle to 230-260 ℃, and preserving the temperature for 20-40 minutes to obtain a mixed reactant in a molten state after full reaction;
e. placing polybenzimidazole and glycerol ethylene distearamide as antistatic agents, sodium lignosulfonate as dispersing agents, butane as foaming agents and azodicarbonamide into a high-speed mixer, and heating and mixing at the temperature of 92-98 ℃ at the speed of 800-900 revolutions per minute for 5-10 minutes to obtain a heating and stirring mixture;
f. putting the mixed reactant in the molten state in the step d and the heated and stirred mixture in the step e into a stirrer together, stirring and mixing at the speed of 110-120 revolutions per minute at the temperature of 260-280 ℃, and adding the mixed fiber into the stirred mixture to form a polymerization product in the molten state;
g. adding the ultrafine crushed mixture in the step c into the polymerization product in the molten state in the step f to form mixed sol, simultaneously injecting a foaming agent and talcum powder, and continuously foaming at the temperature of 300 ℃ at 260 ℃ so as to generate a large amount of bubbles in the mixed sol to form a foaming master batch;
h. and g, adding the foaming master batch in the step g into a single-screw extruder for continuous extrusion, and cooling and molding the extruded material to obtain the high-moisture-absorption flame-retardant pearl cotton.
The advantages and the principle of the invention are as follows:
1. the invention does not use flame retardant, and the pearl cotton prepared under the condition of matching various additives has excellent flame retardant effect.
2. The invention adopts the mixture of the argil and the light calcium carbonate with the weight part ratio of 1:2-3, improves the thermal stability and the flame retardant effect of the material, and has good promotion effect on the mechanical property of the pearl wool.
3. The mixed fiber is formed by mixing bamboo fiber and soybean protein fiber, wherein the chemical components of the bamboo fiber mainly comprise cellulose, hemicellulose and lignin, the cellulose, the hemicellulose and the lignin belong to high polysaccharide, the soybean protein fiber is fiber with a certain protein space structure, and the soybean protein fiber can be yellowed at high temperature. The bamboo fiber and the soybean protein fiber are mixed according to a proportion and then treated by ultrasonic wave, the end part of the bamboo fiber can be embedded into the space structure of the soybean protein fiber, and the bamboo fiber is wrapped after freezing treatment, so that the prepared mixed fiber not only can improve the volume of the fiber, improve the moisture absorption performance of the material, but also can reduce the fiber density, and the subsequently prepared pearl cotton has stronger mechanical property.
4. The invention also adopts the antistatic agent mixed in a certain proportion, so that the pearl wool has stronger antistatic property, and the talcum powder Mg3[Si4O10](OH)2The crystal belongs to a monoclinic system, and the crystal is in a pseudo-hexagonal or rhombic sheet shape and is occasionally seen. Usually in the form of a dense mass, leaf, radial, fibrous mass, and positively promotes the mechanical properties of the material.
Detailed Description
The technical solution of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1:
the pearl wool comprises the following raw materials: 70kg of ethylene, 130kg of butene copolymer, 10kg of titanate modified calcium carbonate, 15kg of polyvinyl acetate, 15kg of isooctyl acrylate, 1kg of auxiliary agent, 7kg of mixed fiber, 3kg of dispersing agent, 5kg of antistatic agent, 10kg of foaming agent and 6kg of talcum powder.
The auxiliary agent is a mixture of argil and light calcium carbonate, and the weight part ratio of the argil to the light calcium carbonate is 1: 2.
The mixed fiber is formed by mixing bamboo fiber and soybean protein fiber, and the weight part ratio of the bamboo fiber to the soybean protein fiber is 1: 1.
The mixed fiber is treated by ultrasonic wave, and the specific treatment mode is as follows: treating the mixed bamboo fiber and the soybean protein fiber with the weight ratio of 1:1 for 2-5min by using ultrasonic waves, freezing for 30-50min at the temperature of-10 ℃, and continuing to perform ultrasonic treatment for 2-5 min.
The dispersant is sodium lignosulfonate.
The antistatic agent is a mixture of glycerol ethylene distearamide and polybenzimidazole, and the weight parts of the antistatic agent are as follows: 1: 6.
the foaming agent is butane and azodicarbonamide according to the weight portion ratio of 1:2, or a mixture thereof.
The preparation method of the pearl cotton comprises the following steps:
a. putting ethylene, a butylene copolymer, titanate modified calcium carbonate and calcium stearate into a reaction kettle to perform high-pressure compression polymerization reaction;
b. removing unreacted ethylene from the product obtained in the step a by using a separator, then carrying out melt extrusion and drying to obtain low-density polyethylene;
c. placing the auxiliary agent into a crushing device of a superfine crusher for mixing and crushing, and screening to obtain a superfine crushed mixture with the particle size of 280-320 meshes;
d. placing low-density polyethylene, polyvinyl acetate and isooctyl acrylate into a reaction kettle, raising the temperature of the reaction kettle to 230-260 ℃, and preserving the temperature for 20-40 minutes to obtain a mixed reactant in a molten state after full reaction;
e. placing polybenzimidazole and glycerol ethylene distearamide as antistatic agents, sodium lignosulfonate as dispersing agents, butane as foaming agents and azodicarbonamide into a high-speed mixer, and heating and mixing at the temperature of 92-98 ℃ at the speed of 800-900 revolutions per minute for 5-10 minutes to obtain a heating and stirring mixture;
f. putting the mixed reactant in the molten state in the step d and the heated and stirred mixture in the step e into a stirrer together, stirring and mixing at the speed of 110-120 revolutions per minute at the temperature of 260-280 ℃, and adding the mixed fiber into the stirred mixture to form a polymerization product in the molten state;
g. adding the ultrafine crushed mixture in the step c into the polymerization product in the molten state in the step f to form mixed sol, simultaneously injecting a foaming agent and talcum powder, and continuously foaming at the temperature of 300 ℃ at 260 ℃ so as to generate a large amount of bubbles in the mixed sol to form a foaming master batch;
h. and g, adding the foaming master batch in the step g into a single-screw extruder for continuous extrusion, and cooling and molding the extruded material to obtain the pearl cotton in the embodiment 1.
Example 2:
the pearl wool comprises the following raw materials: 72kg of ethylene, 140kg of butene copolymer, 19kg of titanate modified calcium carbonate, 16kg of polyvinyl acetate, 13kg of isooctyl acrylate, 2kg of auxiliary agent, 4kg of mixed fiber, 6kg of dispersing agent, 8kg of antistatic agent, 12kg of foaming agent and 8kg of talcum powder.
The auxiliary agent is a mixture of argil and light calcium carbonate, and the weight part ratio of the argil to the light calcium carbonate is 1: 3.
The mixed fiber is formed by mixing bamboo fiber and soybean protein fiber, and the weight part ratio of the bamboo fiber to the soybean protein fiber is 2: 1.
The mixed fiber is treated by ultrasonic wave, and the specific treatment mode is as follows: treating the mixed bamboo fiber and soybean protein fiber with the weight ratio of 1:1 for 2-5min by ultrasonic wave, freezing at-10 deg.C for 30-50min, adding the rest bamboo fiber, and continuing ultrasonic treatment for 2-5 min.
The dispersant is sodium lignosulfonate.
The antistatic agent is a mixture of glycerol ethylene distearamide and polybenzimidazole, and the weight parts of the antistatic agent are as follows: 1: 6.
the foaming agent is a mixture of butane and azodicarbonamide, and the weight part ratio is 1: 2.
the preparation method is the same as example 1.
Example 3:
the pearl wool comprises the following raw materials: 76kg of ethylene, 152kg of butene copolymer, 15kg of titanate modified calcium carbonate, 18kg of polyvinyl acetate, 14kg of isooctyl acrylate, 1kg of auxiliary agent, 3kg of mixed fiber, 8kg of dispersing agent, 3kg of antistatic agent, 16kg of foaming agent and 9kg of talcum powder.
The auxiliary agent is a mixture of argil and light calcium carbonate, and the weight part ratio of the argil to the light calcium carbonate is 1: 2.
The mixed fiber is formed by mixing bamboo fiber and soybean protein fiber, and the weight part ratio of the bamboo fiber to the soybean protein fiber is 3: 1.
The mixed fiber is treated by ultrasonic wave, and the specific treatment mode is as follows: treating the mixed bamboo fiber and soybean protein fiber with the weight ratio of 1:1 for 2-5min by ultrasonic wave, freezing at-10 deg.C for 30-50min, adding the rest bamboo fiber, and continuing ultrasonic treatment for 2-5 min.
The dispersant is sodium lignosulfonate.
The antistatic agent is a mixture of glycerol ethylene distearamide and polybenzimidazole, and the weight parts of the antistatic agent are as follows: 1: 8.
the foaming agent is a mixture of butane and azodicarbonamide, and the weight part ratio is 1: 1.
the preparation method is the same as example 1.
Example 4:
the pearl wool comprises the following raw materials: 78kg of ethylene, 156kg of butene copolymer, 13kg of titanate modified calcium carbonate, 16kg of polyvinyl acetate, 12kg of isooctyl acrylate, 3kg of auxiliary agent, 8kg of mixed fiber, 5kg of dispersing agent, 6kg of antistatic agent, 18kg of foaming agent and 10kg of talcum powder.
The auxiliary agent is a mixture of argil and light calcium carbonate, and the weight part ratio of the argil to the light calcium carbonate is 1: 3.
The mixed fiber is formed by mixing bamboo fiber and soybean protein fiber, and the weight part ratio of the bamboo fiber to the soybean protein fiber is 4: 1.
The mixed fiber is treated by ultrasonic wave, and the specific treatment mode is as follows: treating the mixed bamboo fiber and soybean protein fiber with the weight ratio of 1:1 for 2-5min by ultrasonic wave, freezing at-10 deg.C for 30-50min, adding the rest bamboo fiber, and continuing ultrasonic treatment for 2-5 min.
The dispersant is sodium lignosulfonate.
The antistatic agent is a mixture of glycerol ethylene distearamide and polybenzimidazole, and the weight parts of the antistatic agent are as follows: 1: 5.
the foaming agent is a mixture of butane and azodicarbonamide, and the weight part ratio is 1: 2.
the preparation method is the same as example 1.
Example 5:
the pearl wool comprises the following raw materials: 80kg of ethylene, 160kg of butene copolymer, 14kg of titanate modified calcium carbonate, 17kg of polyvinyl acetate, 15kg of isooctyl acrylate, 2kg of auxiliary agent, 6kg of mixed fiber, 7kg of dispersing agent, 9kg of antistatic agent, 20kg of foaming agent and 5kg of talcum powder.
The auxiliary agent is a mixture of argil and light calcium carbonate, and the weight part ratio of the argil to the light calcium carbonate is 1: 1.
The mixed fiber is formed by mixing bamboo fiber and soybean protein fiber, and the weight part ratio of the bamboo fiber to the soybean protein fiber is 5: 1.
The mixed fiber is treated by ultrasonic wave, and the specific treatment mode is as follows: treating the mixed bamboo fiber and soybean protein fiber with the weight ratio of 1:1 for 2-5min by ultrasonic wave, freezing at-10 deg.C for 30-50min, adding the rest bamboo fiber, and continuing ultrasonic treatment for 2-5 min.
The dispersant is sodium lignosulfonate.
The antistatic agent is a mixture of glycerol ethylene distearamide and polybenzimidazole, and the weight parts of the antistatic agent are as follows: 1: 6.
the foaming agent is a mixture of butane and azodicarbonamide, and the weight part ratio is 1: 1.
the preparation method is the same as example 1.
Example 6:
the pearl wool comprises the following raw materials: 75kg of ethylene, 135kg of butene copolymer, 16kg of titanate modified calcium carbonate, 20kg of polyvinyl acetate, 14kg of isooctyl acrylate, 3kg of auxiliary agent, 5kg of mixed fiber, 10kg of dispersing agent, 10kg of antistatic agent, 17kg of foaming agent and 7kg of talcum powder.
The auxiliary agent is a mixture of argil and light calcium carbonate, and the weight part ratio of the argil to the light calcium carbonate is 1: 4.
The mixed fiber is formed by mixing bamboo fiber and soybean protein fiber, and the weight part ratio of the bamboo fiber to the soybean protein fiber is 6: 1.
The mixed fiber is treated by ultrasonic wave, and the specific treatment mode is as follows: treating the mixed bamboo fiber and soybean protein fiber with the weight ratio of 1:1 for 2-5min by ultrasonic wave, freezing at-10 deg.C for 30-50min, adding the rest bamboo fiber, and continuing ultrasonic treatment for 2-5 min.
The dispersant is sodium lignosulfonate.
The antistatic agent is a mixture of glycerol ethylene distearamide and polybenzimidazole, and the weight parts of the antistatic agent are as follows: 1: 5.
the foaming agent is a mixture of butane and azodicarbonamide, and the weight part ratio is 1: 2.
the preparation method is the same as example 1.
Comparative example 1, raw material proportions and preparation method reference example 4 with the following differences: mixed fibers are not adopted, only bamboo fibers are adopted, and soybean protein fibers are not added.
Comparative example 2, raw material ratio and preparation method referring to example 4, the difference is: mixed fibers are not adopted, only soybean protein fibers are adopted, and bamboo fibers are not added.
Comparative example 3: raw material ratios and preparation methods reference example 4 with the following differences: bamboo fibers and soybean protein fibers are normally mixed without being subjected to a special step treatment.
Comparative example 4: the raw materials are proportioned according to example 4, and the preparation method comprises the following steps: a. putting ethylene, a butylene copolymer, titanate modified calcium carbonate and calcium stearate into a reaction kettle to perform high-pressure compression polymerization reaction;
b. removing unreacted ethylene from the product obtained in the step a by using a separator, then carrying out melt extrusion and drying to obtain low-density polyethylene;
c. placing the auxiliary agent into a crushing device of a superfine crusher for mixing and crushing, and screening to obtain a superfine crushed mixture with the particle size of 280-320 meshes;
d. placing low-density polyethylene, polyvinyl acetate, isooctyl acrylate, antistatic agent polybenzimidazole and glycerol ethylene distearamide, foaming agent butane, azodicarbonamide, mixed fiber, dispersing agent and talcum powder into a reaction kettle, raising the temperature of the reaction kettle to 230-260 ℃, and preserving the temperature for 20-40 minutes to obtain a mixed reactant in a molten state after the reaction is fully performed; then placing the mixture in a high-speed mixer to form a foaming master batch;
c. and g, adding the foaming master batch in the step g into a single-screw extruder for continuous extrusion, and cooling and molding the extruded material to obtain the pearl cotton in the comparative example 4.
The pearl cotton obtained in the above example and comparative examples 1 to 4 were tested, and the test results are as follows:
Figure BDA0002564911740000071
from the above data, it is shown that examples 1 to 6 are significantly higher than comparative examples 1 to 4 in terms of mechanical properties, especially tensile strength and elongation at break.
The comparative example has no significant disadvantage in terms of antistatic properties.
In terms of flame retardancy, the oxygen indexes of examples 1 and 6 are found to be lower than 26% by testing the oxygen index, and are not flame retardant grades, so that examples 2 to 5 have significant advantages in terms of flame retardancy.
The moisture absorption performance of examples 1-6 is significantly better than that of comparative examples 1-4 in terms of moisture absorption, with the most significant moisture absorption performance of examples 3-4.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

Claims (8)

1. The highly hygroscopic and flame-retardant pearl wool comprises the following raw materials: 70-80 parts of ethylene, 160 parts of butene copolymer 130-one, 10-19 parts of titanate modified calcium carbonate, 15-20 parts of polyvinyl acetate, 12-15 parts of isooctyl acrylate, 1-3 parts of auxiliary agent, 3-8 parts of mixed fiber, 3-10 parts of dispersing agent, 3-10 parts of antistatic agent, 10-20 parts of foaming agent and 5-10 parts of talcum powder.
2. The highly hygroscopic and flame retardant pearl wool according to claim 1, wherein: the auxiliary agent is a mixture of argil and light calcium carbonate, and the weight part ratio of the argil to the light calcium carbonate is 1: 2-3.
3. The highly hygroscopic and flame retardant pearl wool according to claim 1, wherein: the mixed fiber is formed by mixing bamboo fiber and soybean protein fiber, and the weight part ratio of the bamboo fiber to the soybean protein fiber is 3-5: 1.
4. The highly hygroscopic and flame retardant pearl wool according to claim 3, wherein: the mixed fiber is subjected to ultrasonic treatment, and the specific treatment mode is as follows: treating the mixed bamboo fiber and soybean protein fiber with the weight ratio of 1:1 for 2-5min by ultrasonic wave, freezing at-10 deg.C for 30-50min, adding the rest bamboo fiber, and continuing ultrasonic treatment for 2-5 min. .
5. The highly hygroscopic and flame retardant pearl wool according to claim 1, wherein: the dispersant is sodium lignosulfonate.
6. The highly hygroscopic and flame retardant pearl wool according to claim 1, wherein: the antistatic agent is a mixture of glycerol ethylene distearamide and polybenzimidazole, and comprises the following components in parts by weight: 1: 5-8.
7. The highly hygroscopic and flame retardant pearl wool according to claim 1, wherein: the foaming agent is butane and azodicarbonamide according to the weight portion ratio of 1: 1-2.
8. The preparation method of the high-moisture-absorption and flame-retardant pearl wool according to any one of 1 to 7 comprises the following steps:
a. putting ethylene, a butylene copolymer, titanate modified calcium carbonate and calcium stearate into a reaction kettle to perform high-pressure compression polymerization reaction;
b. removing unreacted ethylene from the product obtained in the step a by using a separator, then carrying out melt extrusion and drying to obtain low-density polyethylene;
c. placing the auxiliary agent into a crushing device of a superfine crusher for mixing and crushing, and screening to obtain a superfine crushed mixture with the particle size of 280-320 meshes;
d. placing low-density polyethylene, polyvinyl acetate and isooctyl acrylate into a reaction kettle, raising the temperature of the reaction kettle to 230-260 ℃, and preserving the temperature for 20-40 minutes to obtain a mixed reactant in a molten state after full reaction;
e. placing polybenzimidazole and glycerol ethylene distearamide as antistatic agents, sodium lignosulfonate as dispersing agents, butane as foaming agents and azodicarbonamide into a high-speed mixer, and heating and mixing at the temperature of 92-98 ℃ at the speed of 800-900 revolutions per minute for 5-10 minutes to obtain a heating and stirring mixture;
f. putting the mixed reactant in the molten state in the step d and the heated and stirred mixture in the step e into a stirrer together, stirring and mixing at the speed of 110-120 revolutions per minute at the temperature of 260-280 ℃, and adding the mixed fiber into the stirred mixture to form a polymerization product in the molten state;
g. adding the ultrafine crushed mixture in the step c into the polymerization product in the molten state in the step f to form mixed sol, simultaneously injecting a foaming agent and talcum powder, and continuously foaming at the temperature of 300 ℃ at 260 ℃ so as to generate a large amount of bubbles in the mixed sol to form a foaming master batch;
h. and g, adding the foaming master batch in the step g into a single-screw extruder for continuous extrusion, and cooling and molding the extruded material to obtain the high-moisture-absorption flame-retardant pearl cotton.
CN202010620131.5A 2020-07-01 2020-07-01 High-moisture-absorption flame-retardant pearl cotton and preparation method thereof Withdrawn CN111763385A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114588791A (en) * 2022-02-28 2022-06-07 采纳科技股份有限公司 Filtering membrane and preparation method thereof

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114588791A (en) * 2022-02-28 2022-06-07 采纳科技股份有限公司 Filtering membrane and preparation method thereof

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