CN109897315B - Preparation method of maleic anhydride polypropylene micro-nanofiber/polyvinyl alcohol foam material - Google Patents
Preparation method of maleic anhydride polypropylene micro-nanofiber/polyvinyl alcohol foam material Download PDFInfo
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Abstract
The invention relates to the field of composite materials or high polymer foam materials, in particular to a preparation method of a maleic anhydride polypropylene micro-nanofiber/polyvinyl alcohol foam material. The invention discloses a preparation method of a maleic anhydride polypropylene micro-nanofiber/polyvinyl alcohol foam material, aiming at the problem of low mechanical strength of the existing polyvinyl alcohol foam material, the invention takes PP-g-MAH micro-nanofiber and polyvinyl alcohol which are formed in situ in polyvinyl alcohol as main components, and adds a foaming agent and a cross-linking agent to prepare the polyvinyl alcohol foam composite material, and the mechanical properties of the foam material are effectively improved by utilizing the advantages that the composite materials can mutually make up for the deficiencies and generate a synergistic effect.
Description
Technical Field
The invention relates to the field of composite materials or high polymer foam materials, in particular to a preparation method of a maleic anhydride polypropylene micro-nanofiber/polyvinyl alcohol foam material.
Background
The foaming material has the advantages of light weight, heat resistance, low price and the like, is widely applied to industry, agriculture, packaging industry, transportation industry and the like, and is mainly concentrated on polystyrene foaming materials, polypropylene foaming materials, polyurethane foaming materials and polyethylene foaming materials in China. The traditional foaming material is not easy to degrade in the environment and causes certain pollution to the environment. Polyvinyl alcohol (PVA) is a hydrolysis product of polyvinyl acetate, has a polyhydroxy structure, is nontoxic, has good adhesion, heat resistance and hydrophilicity, and is easy to degrade. The polyvinyl alcohol foam material has good wear resistance and weather resistance, is easy to degrade, has good chemical stability and biocompatibility, but has poor mechanical property, so that the polyvinyl alcohol foam material is not widely applied.
With the change of modern science and technology, the requirements of people on materials are increasingly wide and severe, and the materials with single components are generally difficult to meet the requirements of society and production. Two or more than two heterogeneous, special-shaped and anisotropic materials are combined into a composite material through a certain process, the expected requirements of people on certain performance are met, and the composite material becomes an important way for developing high-performance materials. It can be said that the compounding of materials is the main trend in the development of the material industry today. In order to overcome the performance defect of the foam material, some fiber reinforced materials can be added and bonded into a whole, and the fibers can play a role in transferring load and can endow the foam material with excellent comprehensive performance. When the diameter of the fiber is as small as submicron or nanometer, the fiber shows a series of unusual characteristics, such as: has extremely large specific surface area, leads to the increase of surface energy and activity, thereby generating surface effect, quantum size effect, small size effect and the like. In addition, the nanofiber has surprising characteristics in terms of flexibility, mechanical properties and the like. Patent 201410229516.3 discloses a polyvinyl alcohol syntactic foam comprising polyvinyl alcohol and nanofibers, which is prepared by adding a nanofiber suspension to a polyvinyl alcohol solution, evaporating the solvent under stirring, freeze-forming, and freeze-drying. However, the acquisition of the nano-cellulose used in the method requires chemical or enzymatic pretreatment, and consumes a large amount of energy. The polyvinyl alcohol composite foam material is added with the nano fibers, so that the waterproofness of the foam material is enhanced, and the dimensional stability of the foam is improved; on the other hand, the compressive strength and modulus of the foam are increased.
In-situ fiber forming is a method for forming a fiber reinforced material in situ by drawing two thermodynamically incompatible polymers with different melting points at a temperature above the melting points of the polymers, forming microfibers with a certain length-diameter ratio by a dispersed phase under the combined action of a drawing flow field and a shearing flow field. In the research of the in-situ fiber forming and reinforcing technology, no related research report of the polyvinyl alcohol foaming material reinforced by the in-situ fiber forming is reported at present. Polypropylene (PP) is a thermoplastic polymer with excellent comprehensive performance and one of general high polymer materials with wide application, and a grafted compound of the PP is continuously updated due to the fact that the grafted compound can endow functional characteristics and expand the application field. Maleic anhydride molecules are grafted on a polyethylene molecular chain by means of chemical reaction to prepare maleic acid dry polypropylene (PP-g-MAH), so that the product has good processability and other excellent performances of polyethylene, has re-reactivity and strong polarity of maleic anhydride polar molecules, is favorable for being used as a coupling agent and a re-reaction modifier, and has wide application in the field of plastics.
Disclosure of Invention
The invention aims to provide a preparation method of a high-strength PVA (polyvinyl alcohol) foaming material, and particularly discloses a preparation method of a maleic anhydride polypropylene micro-nano fiber/polyvinyl alcohol foaming material, aiming at the problem of low mechanical strength of the existing polyvinyl alcohol foaming material.
The technical scheme of the invention is realized as follows:
a preparation method of a maleic anhydride polypropylene micro-nanofiber/polyvinyl alcohol foam material comprises the following steps:
(1) weighing PVA and glycerol according to the weight parts, putting the PVA and the glycerol into a high-speed mixer, controlling the mixing temperature to be 50-70 ℃, uniformly mixing, then melting, blending and granulating by using a double-screw extruder at 150-180 ℃ to obtain plasticized PVA particles;
(2) putting the plasticized PVA particles obtained in the step (1) and PP-g-MAH (maleic anhydride grafted polypropylene) particles into a high-speed mixer according to parts by weight, controlling the mixing temperature to be 50-70 ℃, uniformly mixing, then melting, blending and extruding by using a double-screw extruder at 160-180 ℃, simultaneously stretching by 4-12 times through a traction device, and then cutting the stretched blended material strips into particles to obtain blended particles;
(3) adding the blended particles obtained in the step (2) into deionized water, and stirring for 2-4 hours at the temperature of 85-95 ℃ until polyvinyl alcohol is completely dissolved to form a uniform solution;
(4) and (3) cooling the uniform solution obtained in the step (3) to 20-30 ℃, adding a surfactant, a foaming agent and starch, stirring for 5-10 min, adding a cross-linking agent and a catalyst, stirring uniformly to obtain a mixture, pouring the mixture into a mold, crosslinking, foaming and curing at 50-80 ℃ for 3-5 hours, taking out the foam, fully washing, and removing residues to obtain the PP-g-MAH nanofiber/PVA composite foaming material.
The PVA and the glycerol are added in the step (1) in the weight parts of 70-80 parts and 20-30 parts in sequence.
In the step (1), PVA is selected from PVA1799 or PVA1797, wherein the polymerization degree of PVA1799 is 1700, and the alcoholysis degree is 99%, and the polymerization degree of PVA1797 is 1700, and the alcoholysis degree is 97%.
In the step (2), the weight parts of the PVA and the PP-g-MAH particles are 70-95 parts and 5-30 parts in sequence, and the grafting ratio of the PP-g-MAH particles is 1%.
The adding weight parts of the blended particles and the deionized water in the step (3) are 0.8-1.5 parts and 8.5-9.2 parts in sequence.
In the step (4), the addition weight parts of the surfactant, the foaming agent and the starch are 0.1-0.3 part, 0.2-0.8 part and 0.1-0.5 part in sequence; the addition amount of the cross-linking agent and the catalyst is 0.1-0.5 part.
In the step (4), the surfactant is one of sodium dodecyl sulfate, sodium dodecyl benzene sulfonate and silicone oil, the foaming agent is one of n-pentane and monofluoro-dichloroethane, the cross-linking agent is one of formaldehyde and glutaraldehyde, and the catalyst is one of hydrochloric acid and sulfuric acid.
The invention has the beneficial effects that:
1. the method comprises the steps of firstly, taking PP-g-MAH and plasticized PVA as raw materials, preparing a composite material with the PVA as a matrix and the PP-g-MAH as a disperse phase through twin-screw extrusion and stretching, wherein the PP-g-MAH forms in-situ microfiber in the PVA matrix due to the shearing, stretching and other effects exerted by a continuous phase in the process; and then dissolving the PP-g-MAH/PVA composite material in water, adding a foaming agent and a cross-linking agent to prepare the PP-g-MAH/PVA composite foaming material, wherein the PVA is dissolved in the water and the PP-g-MAH is not dissolved in the process, so that the micro-nano fiber structure of the dispersed PP-g-MAH is maintained to achieve the purpose of in-situ reinforcement. Meanwhile, the PVA and the PP-g-MAH have hydrogen bond action, so that the compatibility between the PVA and the PP-g-MAH is improved, PP-g-MAH microfibers can be uniformly dispersed in a polyvinyl alcohol matrix, the diameter of the microfibers can reach the nanometer level, and the mechanical property of the polyvinyl alcohol foam material is effectively improved.
2. The polymer nanofiber prepared by the melt blending method has the advantages of low cost, mild condition, easiness in control, easiness in obtaining raw materials, environmental friendliness, suitability for industrial large-scale production and the like. The foaming material can be applied to industries such as drinks, foods, brewing, pharmacy, chemical engineering, sewage treatment, environmental protection and the like, and meets the requirements of higher technical conditions in a clarification and purification, solid-liquid separation and filtration recovery system.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments of the present invention, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without inventive effort based on the embodiments of the present invention, are within the scope of the present invention.
Example 1
The preparation method of the maleic anhydride polypropylene micro-nanofiber/polyvinyl alcohol foam material comprises the following steps:
putting 700 g of polyvinyl alcohol (PVA 1799) and 300 g of glycerol into a high-speed mixer, controlling the mixing temperature at 70 ℃, and uniformly mixing; melt blending and granulating by a double-screw extruder at 180 ℃ to obtain plasticized polyvinyl alcohol particles. Putting 900 g of plasticized PVA and 100 g of PP-g-MAH into a high-speed mixer, controlling the mixing temperature at 70 ℃, and uniformly mixing; and (3) melting, blending and extruding by using a double-screw extruder at 180 ℃, simultaneously performing 6-time stretching by using a traction device, and then pelletizing the stretched blend strips.
Adding 8 g of the blended particles into 92 g of deionized water, and stirring for 2 hours at the temperature of 90 ℃ until polyvinyl alcohol is completely dissolved to form a uniform solution; then cooling the solution to 20 ℃, adding 1 g of sodium dodecyl benzene sulfonate, 5 g of n-pentane and 1 g of starch, stirring for 10min, adding 1 g of glutaraldehyde and 1 g of hydrochloric acid, and stirring uniformly; and finally, pouring the mixture into a mold, crosslinking, foaming and curing at 50 ℃ for 5 hours, taking out the foam, fully washing, and removing residues to obtain the PP-g-MAH nanofiber/PVA composite foam material. The tensile strength of this foam was 2.1 MPa.
Example 2
The preparation method of the maleic anhydride polypropylene micro-nanofiber/polyvinyl alcohol foam material comprises the following steps:
putting 800 g of polyvinyl alcohol (PVA 1797) and 200 g of glycerol into a high-speed mixer, controlling the mixing temperature at 70 ℃, and uniformly mixing; melt blending and granulating by a double-screw extruder at 165 ℃ by adopting a conventional method to obtain plasticized polyvinyl alcohol particles. Putting 850 g of plasticized polyvinyl alcohol and 150 g of PP-g-MAH into a high-speed mixer, controlling the mixing temperature at 70 ℃, and uniformly mixing; and (3) melting, blending and extruding by using a double-screw extruder at 180 ℃, simultaneously carrying out 8-time stretching by using a traction device, and then cutting the stretched blend into particles.
Adding 15 g of the blended particles into 85 g of deionized water, stirring for 4 hours at the temperature of 85 ℃ until polyvinyl alcohol is completely dissolved to form a uniform solution, then cooling the solution to 30 ℃, adding 2 g of sodium dodecyl benzene sulfonate, 7 g of n-pentane and 2 g of starch, stirring for 10min, adding 2 g of glutaraldehyde and 1.5 g of hydrochloric acid, and stirring uniformly; and finally, pouring the mixture into a mold, crosslinking, foaming and curing at 50 ℃ for 5 hours, taking out the foam, fully washing, and removing residues to obtain the PP-g-MAH nanofiber/PVA composite foam material. The tensile strength of this foam was 3.9 MPa.
Example 3
The preparation method of the maleic anhydride polypropylene micro-nanofiber/polyvinyl alcohol foam material comprises the following steps:
adding 750 g of polyvinyl alcohol (PVA 1797) and 250 g of glycerol into a high-speed mixer, controlling the mixing temperature at 50 ℃, and uniformly mixing; and (3) carrying out melt blending and granulation by using a double-screw extruder at 170 ℃ by adopting a conventional method to obtain plasticized polyvinyl alcohol particles. Putting 850 g of plasticized PVA and 150 g of PP-g-MAH into a high-speed mixer, controlling the mixing temperature at 50 ℃, and uniformly mixing; melt blending and extruding the mixture by a double-screw extruder at 180 ℃, simultaneously drawing the mixture by 10 times by a traction device, and then cutting the drawn mixture into particles.
10 grams of the blended particles were added to 90 grams of deionized water and stirred at 95 ℃ for 2 hours until the polyvinyl alcohol was completely dissolved to form a homogeneous solution. Cooling the solution to 25 ℃, adding 2 parts of lauryl sodium sulfate, 6 parts of monofluoro dichloroethane and 3 parts of starch, stirring for 8min, adding 2 parts of formaldehyde and 3 parts of sulfuric acid, and uniformly stirring; and then pouring the mixture into a mold, crosslinking, foaming and curing at 70 ℃ for 4 hours, taking out the foam, fully washing, and removing residues to obtain the PP-g-MAH nanofiber/PVA composite foam material. The tensile strength of this foam was 4.6 MPa.
Example 4
The preparation method of the maleic anhydride polypropylene micro-nanofiber/polyvinyl alcohol foam material comprises the following steps:
putting 720 g of polyvinyl alcohol (PVA 1799) and 280 g of glycerol into a high-speed mixer, controlling the mixing temperature at 70 ℃, and uniformly mixing; and (3) carrying out melt blending and granulation by a double-screw extruder at 160 ℃ by adopting a conventional method to obtain plasticized polyvinyl alcohol particles. Putting 950 g of plasticized polyvinyl alcohol and 50 g of PP-g-MAH into a high-speed mixer, controlling the mixing temperature at 70 ℃, and uniformly mixing; melt blending and extruding the mixture by a double-screw extruder at 170 ℃, simultaneously performing 4 times of stretching by a traction device, and then pelletizing the stretched blend strands.
Adding 11 g of the blended particles into 89 g of deionized water, and stirring for 2 hours at the temperature of 95 ℃ until polyvinyl alcohol is completely dissolved to form a uniform solution; cooling the solution to 27 ℃, adding 2 parts of silicone oil, 7 parts of monofluoro dichloroethane and 2.5 parts of starch, stirring for 7min, adding 2 parts of formaldehyde and 2 parts of sulfuric acid, and uniformly stirring; and then pouring the mixture into a mold, crosslinking, foaming and curing at 65 ℃ for 4.5 hours, taking out the foam, fully washing, and removing residues to obtain the PP-g-MAH nanofiber/PVA composite foam material. The tensile strength of this foam was 3.2 MPa.
Example 5
The preparation method of the maleic anhydride polypropylene micro-nanofiber/polyvinyl alcohol foam material comprises the following steps:
760 g of polyvinyl alcohol (PVA 1797) and 240 g of glycerol are put into a high-speed mixer, the mixing temperature is controlled at 60 ℃, and the mixture is uniformly mixed; and (3) carrying out melt blending and granulation by using a double-screw extruder at 170 ℃ by adopting a conventional method to obtain plasticized polyvinyl alcohol particles. Putting 700 g of plasticized polyvinyl alcohol and 300 g of PP-g-MAH into a high-speed mixer, controlling the mixing temperature at 70 ℃, and uniformly mixing; melt blending and extruding the mixture by a double-screw extruder at 190 ℃, simultaneously drawing the mixture by 12 times by a drawing device, and then cutting the drawn mixture into particles.
Adding 12 g of the blended particles into 88 g of deionized water, stirring for 3 hours at the temperature of 92 ℃ until polyvinyl alcohol is completely dissolved to form a uniform solution, cooling the solution to 25 ℃, adding 3 g of silicone oil, 8 g of monofluoroethane and 1 g of starch, stirring for 8min, adding 3 g of formaldehyde and 2 g of sulfuric acid, and stirring uniformly; and then pouring the mixture into a mold, crosslinking, foaming and curing at 70 ℃ for 5 hours, taking out the foam, fully washing, and removing residues to obtain the PP-g-MAH nanofiber/PVA composite foam material. The tensile strength of this foam was 5.8 MPa.
Example 6
The preparation method of the maleic anhydride polypropylene micro-nanofiber/polyvinyl alcohol foam material comprises the following steps:
730 g of polyvinyl alcohol (PVA 1799) and 270 g of glycerol are put into a high-speed mixer, the mixing temperature is controlled at 60 ℃, and the mixture is uniformly mixed; and (3) carrying out melt blending and granulation by a double-screw extruder at 150 ℃ by adopting a conventional method to obtain plasticized polyvinyl alcohol particles. Putting 875 grams of plasticized polyvinyl alcohol and 125 grams of PP-g-MAH into a high-speed mixer, controlling the mixing temperature at 70 ℃, and uniformly mixing; melt blending and extruding the mixture by a double-screw extruder at 180 ℃, simultaneously performing 7-fold stretching by a traction device, and then pelletizing the stretched blend strands.
Adding 9 g of the blended particles into 91 g of deionized water, and stirring for 3 hours at the temperature of 92 ℃ until polyvinyl alcohol is completely dissolved to form a uniform solution; then cooling the solution to 25 ℃, adding 1 g of sodium dodecyl benzene sulfonate, 6 parts of monofluoro dichloroethane and 2 g of starch, stirring for 10min, then adding 1 g of glutaraldehyde and 1 g of sulfuric acid, and stirring uniformly; and finally, pouring the mixture into a mold, crosslinking, foaming and curing at 65 ℃ for 4 hours, taking out the foam, fully washing, and removing residues to obtain the PP-g-MAH nanofiber/PVA composite foam material. The tensile strength of this foam was 4.3 MPa.
Example 7
The preparation method of the maleic anhydride polypropylene micro-nanofiber/polyvinyl alcohol foam material comprises the following steps:
putting 770 g of polyvinyl alcohol (PVA 1797) and 230 g of glycerol into a high-speed mixer, controlling the mixing temperature at 70 ℃, and uniformly mixing; melt blending and granulating by a double-screw extruder at 175 ℃ by adopting a conventional method to obtain plasticized polyvinyl alcohol particles. Putting 750 g of plasticized polyvinyl alcohol and 275 g of PP-g-MAH into a high-speed mixer, controlling the mixing temperature at 70 ℃, and uniformly mixing; melt blending and extruding the mixture by a double-screw extruder at 190 ℃, simultaneously performing 9 times of stretching by a traction device, and then pelletizing the stretched blend strands.
Adding 11 g of the blended particles into 99 g of deionized water, stirring for 2 hours at the temperature of 95 ℃ until polyvinyl alcohol is completely dissolved to form a uniform solution, adding 1.5 parts of silicone oil, 4 g of n-pentane and 2 g of starch, stirring for 6min, adding 3 g of glutaraldehyde and 2.5 g of sulfuric acid, and stirring uniformly; and then pouring the mixture into a mold, crosslinking, foaming and curing at 65 ℃ for 5 hours, taking out the foam, fully washing, and removing residues to obtain the PP-g-MAH nanofiber/PVA composite foam material. The tensile strength of this foam was 4.7 MPa.
Example 8
The preparation method of the maleic anhydride polypropylene micro-nanofiber/polyvinyl alcohol foam material comprises the following steps:
putting 790 g of polyvinyl alcohol (PVA 1797) and 210 g of glycerol into a high-speed mixer, controlling the mixing temperature at 70 ℃, and uniformly mixing; melt blending and granulating by a double-screw extruder at 164 ℃ by adopting a conventional method to obtain plasticized polyvinyl alcohol particles. Putting 870 g of plasticized polyvinyl alcohol and 130 g of PP-g-MAH into a high-speed mixer, controlling the mixing temperature at 70 ℃, and uniformly mixing; melt blending and extruding the mixture at 185 ℃ by using a double-screw extruder, simultaneously performing 10 times of stretching by using a traction device, and then pelletizing the stretched blend strands.
Adding 12 g of the blended particles into 88 g of deionized water, stirring for 3.5 hours at the temperature of 88 ℃ until polyvinyl alcohol is completely dissolved to form a uniform solution, cooling the solution to 25 ℃, adding 1.5 g of silicone oil, 4 g of monofluoro-dichloroethane and 2 g of starch, stirring for 6min, adding 3 g of formaldehyde and 2 g of sulfuric acid, and stirring uniformly; and then pouring the mixture into a mold, crosslinking, foaming and curing at 70 ℃ for 5 hours, taking out the foam, fully washing, and removing residues to obtain the PP-g-MAH nanofiber/PVA composite foam material. The tensile strength of this foam was 5.1 MPa.
Example 9
The preparation method of the maleic anhydride polypropylene micro-nanofiber/polyvinyl alcohol foam material comprises the following steps:
730 g of polyvinyl alcohol (PVA 1799) and 270 g of glycerol are put into a high-speed mixer, the mixing temperature is controlled at 55 ℃, and the mixture is uniformly mixed; melt blending and granulating at 170 ℃ by using a double-screw extruder to obtain plasticized polyvinyl alcohol particles. Putting 840 g of plasticized PVA and 160 g of PP-g-MAH into a high-speed mixer, controlling the mixing temperature at 70 ℃, and uniformly mixing; melt blending and extruding the mixture by a double-screw extruder at 184 ℃, simultaneously performing 7 times of stretching by a traction device, and then pelletizing the stretched blend strands.
Adding 15 g of the blended particles into 85 g of deionized water, stirring for 4 hours at 87 ℃ until polyvinyl alcohol is completely dissolved to form a uniform solution, then cooling the solution to 30 ℃, adding 2 g of sodium dodecyl benzene sulfonate, 7 g of n-pentane and 2 g of starch, stirring for 10min, adding 2 g of glutaraldehyde and 1.5 g of hydrochloric acid, and stirring uniformly; and finally, pouring the mixture into a mold, crosslinking, foaming and curing at 50 ℃ for 5 hours, taking out the foam, fully washing, and removing residues to obtain the PP-g-MAH nanofiber/PVA composite foam material. The tensile strength of this foam was 6.0 MPa.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (3)
1. A preparation method of a maleic anhydride polypropylene micro-nanofiber/polyvinyl alcohol foam material is characterized by comprising the following steps:
(1) weighing PVA and glycerol according to the weight parts, putting the PVA and the glycerol into a high-speed mixer, controlling the mixing temperature to be 50-70 ℃, uniformly mixing, then melting, blending and granulating by using a double-screw extruder at 150-180 ℃ to obtain plasticized PVA particles;
(2) putting the plasticized PVA particles obtained in the step (1) and PP-g-MAH particles into a high-speed mixer according to parts by weight, controlling the mixing temperature to be 50-70 ℃, uniformly mixing, then carrying out melt blending extrusion by using a double-screw extruder at 160-180 ℃, simultaneously carrying out 4-12 times of stretching by using a traction device, and then cutting the stretched blended material strips into particles to obtain blended particles;
(3) adding the blended particles obtained in the step (2) into deionized water, and stirring for 2-4 hours at the temperature of 85-95 ℃ until polyvinyl alcohol is completely dissolved to form a uniform solution;
(4) cooling the uniform solution obtained in the step (3) to 20-30 ℃, adding a surfactant, a foaming agent and starch, stirring for 5-10 min, adding a cross-linking agent and a catalyst, uniformly stirring to obtain a mixture, pouring the mixture into a mold, crosslinking, foaming and curing at 50-80 ℃ for 3-5 hours, taking out the foam, fully washing, and removing residues to obtain the PP-g-MAH nanofiber/PVA composite foam material;
the PVA and the glycerol are added in the step (1) in the weight parts of 70-80 parts and 20-30 parts in sequence;
in the step (2), the weight parts of the PVA and the PP-g-MAH particles are 70-95 parts and 5-30 parts in sequence, and the grafting ratio of the PP-g-MAH particles is 1%;
the adding weight parts of the blended particles and the deionized water in the step (3) are 0.8-1.5 parts and 8.5-9.2 parts in sequence;
in the step (4), the addition weight parts of the surfactant, the foaming agent and the starch are 0.1-0.3 part, 0.2-0.8 part and 0.1-0.5 part in sequence; the addition amount of the cross-linking agent and the catalyst is 0.1-0.5 part.
2. The preparation method of the maleic anhydride polypropylene micro-nanofiber/polyvinyl alcohol foam material according to claim 1, wherein the preparation method comprises the following steps: in the step (1), PVA is selected from PVA1799 or PVA1797, wherein the polymerization degree of PVA1799 is 1700, and the alcoholysis degree is 99%, and the polymerization degree of PVA1797 is 1700, and the alcoholysis degree is 97%.
3. The preparation method of the maleic anhydride polypropylene micro-nanofiber/polyvinyl alcohol foam material according to claim 1, wherein the preparation method comprises the following steps: in the step (4), the surfactant is one of sodium dodecyl sulfate, sodium dodecyl benzene sulfonate and silicone oil, the foaming agent is one of n-pentane and monofluoro-dichloroethane, the cross-linking agent is one of formaldehyde and glutaraldehyde, and the catalyst is one of hydrochloric acid and sulfuric acid.
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| CN105713328A (en) * | 2016-01-29 | 2016-06-29 | 四川大学 | High-fill high-heat-resistance polyvinyl alcohol-based microcellular foam type flame retardant paper and thermoplastic processing method thereof |
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