CN112852038B - Cross-linked polyethylene foam material and preparation method thereof - Google Patents
Cross-linked polyethylene foam material and preparation method thereof Download PDFInfo
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- CN112852038B CN112852038B CN202110017188.0A CN202110017188A CN112852038B CN 112852038 B CN112852038 B CN 112852038B CN 202110017188 A CN202110017188 A CN 202110017188A CN 112852038 B CN112852038 B CN 112852038B
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/04—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent
- C08J9/06—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a chemical blowing agent
- C08J9/10—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a chemical blowing agent developing nitrogen, the blowing agent being a compound containing a nitrogen-to-nitrogen bond
- C08J9/102—Azo-compounds
- C08J9/103—Azodicarbonamide
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J3/00—Processes of treating or compounding macromolecular substances
- C08J3/24—Crosslinking, e.g. vulcanising, of macromolecules
- C08J3/246—Intercrosslinking of at least two polymers
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J3/00—Processes of treating or compounding macromolecular substances
- C08J3/28—Treatment by wave energy or particle radiation
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/04—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent
- C08J9/06—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a chemical blowing agent
- C08J9/10—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a chemical blowing agent developing nitrogen, the blowing agent being a compound containing a nitrogen-to-nitrogen bond
- C08J9/104—Hydrazines; Hydrazides; Semicarbazides; Semicarbazones; Hydrazones; Derivatives thereof
- C08J9/105—Hydrazines; Hydrazides; Semicarbazides; Semicarbazones; Hydrazones; Derivatives thereof containing sulfur
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/04—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent
- C08J9/06—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a chemical blowing agent
- C08J9/10—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a chemical blowing agent developing nitrogen, the blowing agent being a compound containing a nitrogen-to-nitrogen bond
- C08J9/107—Nitroso compounds
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09F—NATURAL RESINS; FRENCH POLISH; DRYING-OILS; DRIERS (SICCATIVES); TURPENTINE
- C09F1/00—Obtaining purification, or chemical modification of natural resins, e.g. oleo-resins
- C09F1/04—Chemical modification, e.g. esterification
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2203/00—Foams characterized by the expanding agent
- C08J2203/04—N2 releasing, ex azodicarbonamide or nitroso compound
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
- C08J2323/04—Homopolymers or copolymers of ethene
- C08J2323/06—Polyethene
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2423/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2423/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
- C08J2423/04—Homopolymers or copolymers of ethene
- C08J2423/08—Copolymers of ethene
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2493/00—Characterised by the use of natural resins; Derivatives thereof
- C08J2493/04—Rosin
Abstract
The application discloses a crosslinked polyethylene foam material and a preparation method thereof. In the application, the crosslinked polyethylene foam material is prepared by crosslinking polyethylene and maleic anhydride modified rosin resin salt. Compared with the prior art, the prepared crosslinked polyethylene foam material has high product strength, the elastic modulus is more than 6MPa, the product cohesiveness is high, the surface tension can reach more than 40mN/m, the product can be maintained for more than 6 months, and the requirement of a gluing process is met. In the preparation method of the cross-linked polyethylene foam material provided by the first aspect of the invention, polypropylene or inorganic filler influencing the foaming process is avoided, so that the adverse influence on the foaming process is avoided.
Description
Technical Field
The embodiment of the invention relates to the field of high polymer materials, in particular to a crosslinked polyethylene foam material and a preparation method thereof.
Background
The cross-linked polyethylene foam material is a novel foam plastic with a closed pore structure between soft (polyurethane) foam materials and hard (polystyrene) foam materials, has a series of characteristics of excellent toughness, elasticity, flexibility, wear resistance, chemical corrosion resistance, low temperature resistance, good insulativity and the like, and can be used as a good insulating, heat-insulating, shockproof and buoyancy material. The high-strength polyethylene foamed product is widely applied to the fields of mechanical shock absorption, ground mats, automotive interiors, electronic equipment and the like, and has higher requirements on the strength of the product along with the update of the product.
In the prior art, the method for improving the strength of the crosslinked polyethylene foam material product is to add additives such as polypropylene, glass fiber, calcium carbonate and the like or increase the crosslinking degree of the crosslinked polyethylene foam material. However, in the course of practical research, the inventors found that the polypropylene has a high melting point, so that the processing temperature is high, and the high temperature easily causes decomposition of the foaming agent, thus making the foaming process difficult. In addition, inorganic fillers such as glass fiber and calcium carbonate are poor in intersolubility with polyethylene, the improvement on the product strength is limited, and a large amount of inorganic fillers easily have adverse effects on the foaming process. Too large a degree of crosslinking may result in difficulty in foaming, failure to achieve a suitable foaming ratio, and inconvenience in the foaming process. The use of traditional rosin resins as additives for crosslinking, such as polyethylene, avoids the adverse effects on the foaming process, but has limited strength increase on the product, and the product has short surface tension maintenance time, which is not favorable for long-term storage of the product.
Therefore, there is a need in the art to develop a cross-linked polyethylene foam plastic product with higher strength and longer surface tension maintenance time.
Disclosure of Invention
The invention aims to provide a crosslinked polyethylene foam material and a preparation method thereof.
In order to solve the above technical problems, a first aspect of the present invention provides a crosslinked polyethylene foam material, wherein the crosslinked polyethylene foam material is prepared from the following raw materials: the polyethylene and maleic anhydride modified rosin resin salt, preferably, the crosslinked polyethylene foam material is prepared by crosslinking polyethylene and maleic anhydride modified rosin resin salt.
The polyethylene density ranges are: 0.91-0.93; the polyethylene is preferably low density polyethylene, linear low density polyethylene, or a combination of both. When the polyethylene is the combination of low-density polyethylene and linear low-density polyethylene, the mass ratio of the low-density polyethylene to the linear low-density polyethylene is 100 (10-60), and preferably 100: 30.
In some preferred embodiments, the maleic anhydride modified rosin resin salt is a magnesium salt of maleic anhydride modified rosin resin, a calcium salt of maleic anhydride modified rosin resin, a zinc salt of maleic anhydride modified rosin resin, a potassium salt of maleic anhydride modified rosin resin, a lithium salt of maleic anhydride modified rosin resin, a ferric salt of maleic anhydride modified rosin resin, or a cobalt salt of maleic anhydride modified rosin resin, and the magnesium salt of maleic anhydride modified rosin resin, the calcium salt of maleic anhydride modified rosin resin, the zinc salt of maleic anhydride modified rosin resin, the potassium salt of maleic anhydride modified rosin resin, the lithium salt of maleic anhydride modified rosin resin, the ferric salt of maleic anhydride modified rosin resin, or the cobalt salt of maleic anhydride modified rosin resin can be prepared by a metal ion exchange reaction between a corresponding metal chloride and sodium salt of maleic anhydride modified rosin resin.
In some preferred schemes, the maleic anhydride modified rosin resin salt is prepared by carrying out salt forming reaction on maleic anhydride modified rosin resin; specifically, the preparation of the maleic anhydride modified rosin resin salt comprises the following steps:
(1) under the action of an initiator, treating the rosin resin with maleic anhydride to obtain maleic anhydride modified rosin resin; and
(2) treating the maleic anhydride modified rosin resin obtained in the step (1) with alkali to obtain alkalized maleic anhydride modified rosin resin;
(3) and (3) treating the alkalized maleic anhydride modified rosin resin obtained in the step (2) with metal salt to obtain maleic anhydride modified rosin resin salt.
In the step (1), the mass ratio of the rosin resin to the maleic anhydride is 100 (10-20).
In the step (1), the maleic anhydride-treated rosin resin comprises the steps of: carrying out banburying reaction on 100 parts by mass of rosin resin, 10-20 parts by mass of maleic anhydride and 0.5-2 parts by mass of initiator in a banbury mixer.
In the step (1), the temperature of the banburying reaction is preferably 120-150 ℃.
In the step (1), the banburying reaction time is preferably 1-2 h.
In step (1), the initiator is preferably azobisisobutyronitrile or dicumyl peroxide.
In the step (1), the melting point of the rosin resin is preferably 110-130 ℃.
In the step (2), the maleic anhydride modified rosin resin obtained in the step (1) is subjected to alkali treatment, and comprises the following components: and (2) reacting the maleic anhydride modified rosin resin obtained in the step (1) in alkali at the temperature of 60-80 ℃ for 4-12 hours.
In the step (2), the alkali is preferably sodium hydroxide, and is more preferably an aqueous solution of sodium hydroxide, wherein the mass percentage of the sodium hydroxide in the aqueous solution of sodium hydroxide is 25%.
In the step (3), the metal salt is preferably magnesium chloride, calcium chloride, zinc chloride, potassium chloride, lithium chloride, ferric chloride or cobalt chloride.
The crosslinking can be chemical crosslinking or irradiation crosslinking, preferably irradiation crosslinking, and the irradiation crosslinking can be electron beam irradiation crosslinking or ultraviolet light irradiation crosslinking, preferably electron beam irradiation crosslinking.
In a second aspect, the present invention provides a method for preparing the above cross-linked polyethylene foam material, the method comprising the steps of:
(1) 60-90 parts by weight of polyethylene;
3-20 parts by weight of maleic anhydride modified rosin resin salt;
5 to 25 parts by weight of an elastomer;
2-20 parts by weight of a foaming agent;
1 to 2 parts by weight of a sensitizer;
placing 0.5-4 parts by weight of antioxidant raw material in an extruder for extrusion to obtain a master slice;
(2) carrying out irradiation crosslinking treatment on the master slice to obtain a crosslinked master slice;
(3) and foaming the crosslinked master slice to obtain the crosslinked polyethylene foam material.
Wherein, in the step (1), the polyethylene is preferably low density polyethylene and/or linear low density polyethylene.
In the step (1), the elastomer comprises at least one of ethylene propylene diene monomer, ethylene-octene copolymer, ethylene-vinyl acetate copolymer, natural rubber, isoprene rubber, butadiene rubber, styrene butadiene block copolymer (SBS), pentylene block copolymer (SIS) and chlorinated polyethylene.
In the step (1), the foaming agent comprises at least one of azodicarbonamide, benzenesulfonyl hydrazide, dinitrosopentamethylenetetramine, toluenesulfonyl hydrazide and 4, 4' -oxybis-benzenesulfonyl hydrazide.
In the step (1), the sensitizer includes at least one of zinc acetate, zinc stearate, cobalt stearate, zinc oxalate, zinc oxide and barium stearate.
In the step (1), the antioxidant includes at least one of 2, 6-tertiary butyl-4-methylphenol, bis (3, 5-tertiary butyl-4-hydroxyphenyl) sulfide, and pentaerythrityl tetrakis [ beta- (3, 5-di-tertiary butyl-4-hydroxyphenyl) propionate ] (antioxidant 1010).
In step (1), the extrusion is preferably carried out on a single screw extruder.
In the step (1), the extrusion temperature is preferably 80-140 ℃, for example, 95-125 ℃.
In the step (1), the screw rotation speed of the extruder is preferably 50-90 rpm, for example, 75 rpm.
In the step (1), the die head temperature of the extruder is preferably 90-145 ℃, for example, 125 ℃.
In the step (1), the thickness of the master slice is preferably 0.3-0.7 mm, for example, 0.5 mm.
In the step (2), the irradiation crosslinking treatment is preferably performed on an electron accelerator.
In the step (2), the irradiation dose of the irradiation crosslinking treatment is preferably 25-50 kGy, for example: 35kGy
In the step (3), the foaming is carried out in a foaming furnace.
In the step (3), in the foaming, the temperature of a foaming furnace is 160-260 ℃.
In the step (3), in the foaming, the residence time of the crosslinked master slice is 0.3-0.5 min.
The method also comprises a step (4) after the step (3): and (4) polishing the crosslinked polyethylene foam material obtained in the step (3).
The third aspect of the invention provides the application of the cross-linked polyethylene foam material in the fields of mechanical shock resistance, floor mats, heat-insulating pipes and electronic equipment.
The above preferred conditions can be arbitrarily combined to obtain preferred embodiments of the present invention without departing from the common general knowledge in the art.
The reagents and starting materials used in the present invention are commercially available.
Compared with the prior art, the invention has at least the following advantages:
(1) the cross-linked polyethylene foam material provided by the first aspect of the invention has the advantages of high product strength, elastic modulus of more than 6MPa, high product cohesiveness, surface tension of more than 40mN/m, maintenance of more than 6 months and capability of meeting the requirement of a gluing process.
(2) In the preparation method of the cross-linked polyethylene foam material provided by the first aspect of the invention, polypropylene or inorganic filler influencing the foaming process is avoided, so that the adverse influence on the foaming process is avoided.
(3) In the preparation method, the maleic anhydride modified rosin resin salt has good compatibility with polyethylene, can form an ionic crosslinking structure and accounts for 20 percent of the total weight of the reaction raw materials;
(4) the preparation method has rich raw material sources and low price;
(5) according to the preparation method, the strength and the cohesiveness of the material can be effectively adjusted by adjusting the structure and the dosage of the maleic anhydride modified rosin resin salt;
(6) the product prepared by the preparation method disclosed by the invention has wide application in the fields of mechanical shock resistance, floor mats, heat-insulating pipes, electronic equipment and the like.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the following describes each embodiment of the present invention in detail with reference to the embodiments. However, it will be appreciated by those of ordinary skill in the art that numerous technical details are set forth in order to provide a better understanding of the present application in various embodiments of the present invention. However, the technical solution claimed in the present application can be implemented without these technical details and various changes and modifications based on the following embodiments.
It should be noted that:
(1) the elastic modulus of the crosslinked polyethylene foam material is measured by adopting the method described in the measurement of the bending property of GB/T9341-2008 plastic.
(2) The surface tension of the crosslinked polyethylene foam material is measured by the method recorded in the measurement of the wetting tension of GB-T14216-2008 plastic, films and sheets.
In the following examples, rosin resins were obtained from Baolin chemical industry Co., Ltd, in Foshan City, and maleic anhydride was obtained from Tianjin Bohai chemical industry Co., Ltd.
Example 1
Step one, preparation of maleic anhydride modified rosin resin salt
Carrying out banburying reaction on 100 parts by mass of rosin resin with the melting point of 115 ℃, 15 parts by mass of maleic anhydride and 1 part by mass of azobisisobutyronitrile in a 130 ℃ internal mixer for 1.5h, adding ethanol for dissolving, adding 15 parts by mass of 25% sodium hydroxide for carrying out hydrolysis reaction at 70 ℃ for 10h, filtering, washing with ethyl acetate and drying to obtain the corresponding maleic anhydride modified sodium type rosin resin. Exchanging the sodium resin with the calcium chloride aqueous solution, and introducing the calcium ion type maleic anhydride modified rosin resin salt.
Step two, preparation of cross-linked polyethylene foam material
Uniformly mixing 80 parts by weight of low-density polyethylene, 10 parts by weight of maleic anhydride modified rosin resin salt, 10 parts by weight of ethylene-octene copolymer, 5 parts by weight of azodicarbonamide foaming agent, 1.5 parts by weight of zinc stearate and 1 part by weight of antioxidant 1010, adding the mixture into a single-screw extruder for extrusion, and controlling the extrusion temperature to be 95-125 ℃, the screw rotation speed to be 75rpm and the die head temperature to be 125 ℃ to obtain a master slice with the thickness of 0.3 mm; then, carrying out irradiation crosslinking on the master slice by an electron accelerator, and controlling the irradiation dose to be 35kGy to form a crosslinked polymer network; and finally, placing the crosslinked master slice in a foaming furnace for foaming, controlling the temperature of the foaming furnace to be 160-260 ℃, and keeping the residence time of the crosslinked master slice for 0.5min to obtain the high-strength irradiation crosslinked polyethylene foaming material, wherein the elastic modulus is 6.9MPa, the surface tension is 41mN/m, and the surface tension is 41mN/m after the high-strength irradiation crosslinked polyethylene foaming material is placed for 6 months.
Examples 2 to 6
The reaction was carried out in the same manner as in example 1 except that different metal salts were selected.
TABLE 1
Examples 7 to 10
The same procedure as in example 1 was repeated except that the following different mass ratios of the rosin resin and maleic anhydride were selected and reacted.
TABLE 2
Examples 11 to 14
The same as in example 1 except for the following differences, different ratios of maleic anhydride-modified rosin salt to polyethylene were selected.
TABLE 3
Comparative example 1
According to the embodiment 1, no maleic anhydride modified rosin resin salt is added, 90 parts by weight of low-density polyethylene, 10 parts by weight of ethylene-octene copolymer, 5 parts by weight of foaming agent, 1.5 parts by weight of zinc oxalate and 1 part by weight of antioxidant 1010 are uniformly mixed, then the mixture is added into a single-screw extruder for extrusion, the extrusion temperature is controlled to be 95-125 ℃, the screw rotation speed is 80rpm, and the die head temperature is controlled to be 125 ℃, so that a master slice with the thickness of 0.5mm is obtained; then, carrying out irradiation crosslinking on the master slice by an electron accelerator, and controlling the irradiation dose to be 35kGy to form a crosslinked polymer network; and finally, placing the crosslinked master slice in a foaming furnace for foaming, controlling the temperature of the foaming furnace to be 160-260 ℃, and keeping the residence time of the crosslinked master slice for 0.4min to obtain the irradiation crosslinked polyethylene foaming material, wherein the elastic modulus is 4.1MPa, the surface tension is 32mN/m, the cohesiveness is poor, the surface tension can reach 41mN/m after corona treatment, and the surface tension is 32mN/m after the crosslinked polyethylene foaming material is placed for 6 months, and the cohesiveness is still poor.
It will be understood by those of ordinary skill in the art that the foregoing embodiments are specific examples for carrying out the invention, and that various changes in form and details may be made therein without departing from the spirit and scope of the invention in practice.
Claims (11)
1. The cross-linked polyethylene foam material is characterized in that the cross-linked polyethylene foam material is prepared from the following raw materials: polyethylene and maleic anhydride modified rosin resin salts;
the preparation method of the crosslinked polyethylene foam material comprises the following steps:
extruding the preparation raw materials of the crosslinked polyethylene foam material to obtain a master slice;
carrying out irradiation crosslinking treatment on the master slice;
the preparation raw materials of the crosslinked polyethylene foam material comprise:
60-90 parts of polyethylene and 3-20 parts of maleic anhydride modified rosin resin salt.
2. The cross-linked polyethylene foam material according to claim 1, wherein the polyethylene is low density polyethylene and/or linear low density polyethylene;
and/or the maleic anhydride modified rosin resin salt is prepared by carrying out salt forming reaction on maleic anhydride modified rosin resin.
3. The cross-linked polyethylene foam material as claimed in claim 2, wherein the mass ratio of the low density polyethylene to the linear low density polyethylene is 100 (10-60).
4. The cross-linked polyethylene foam material according to claim 3, wherein the preparation of the maleic anhydride modified rosin resin salt comprises the steps of: (1) under the action of an initiator, treating the rosin resin with maleic anhydride to obtain maleic anhydride modified rosin resin; and
(2) treating the maleic anhydride modified rosin resin obtained in the step (1) with alkali to obtain an alkalized maleic anhydride modified rosin resin; and
(3) and (3) treating the alkalized maleic anhydride modified rosin resin obtained in the step (2) with metal salt to obtain maleic anhydride modified rosin resin salt.
5. The crosslinked polyethylene foam material according to claim 4, wherein in the step (1), the mass ratio of the rosin resin to the maleic anhydride is 100 (10-20);
and/or, in the step (1), the step of treating the rosin resin with maleic anhydride comprises the following steps: carrying out banburying reaction on 100 parts by mass of rosin resin, 10-20 parts by mass of maleic anhydride and 0.5-2 parts by mass of initiator in a banbury mixer;
and/or, in the step (1), the initiator is azobisisobutyronitrile or dicumyl peroxide;
and/or in the step (1), the melting point of the rosin resin is 110-130 ℃;
and/or, in the step (2), the step of treating the maleic anhydride modified rosin resin obtained in the step (1) with the base comprises the following steps: reacting the maleic anhydride modified rosin resin obtained in the step (1) in alkali at the temperature of 60-80 ℃ for 4-12 h;
and/or, in the step (2), the alkali is an aqueous solution of sodium hydroxide;
and/or in the step (3), the metal salt is magnesium chloride, calcium chloride, zinc chloride, potassium chloride, lithium chloride, ferric chloride or cobalt chloride.
6. The cross-linked polyethylene foam material as claimed in claim 5, wherein in the step (1), the temperature of the banburying reaction is 120-150 ℃;
and/or in the step (1), the banburying reaction time is 1-2 h;
and/or in the step (2), the mass percentage of the sodium hydroxide in the aqueous solution of the sodium hydroxide is 25%.
7. The cross-linked polyethylene foam material as claimed in any one of claims 1 to 6, wherein the preparation step of the cross-linked polyethylene foam material comprises:
(a) 60-90 parts by weight of polyethylene;
3-20 parts by weight of maleic anhydride modified rosin resin salt;
5 to 25 parts by weight of an elastomer;
2-20 parts by weight of a foaming agent;
1 to 2 parts by weight of a sensitizer;
placing 0.5-4 parts by weight of antioxidant raw materials into an extruder for extrusion to obtain a master slice; and
(b) carrying out irradiation crosslinking treatment on the master slice to obtain a crosslinked master slice; and
(c) and foaming the crosslinked master slice to obtain the crosslinked polyethylene foam material.
8. The cross-linked polyethylene foam material according to claim 7,
the elastomer comprises at least one of ethylene propylene diene monomer, ethylene-octene copolymer, ethylene-vinyl acetate copolymer, natural rubber, isoprene rubber, butadiene-styrene rubber, styrene-butadiene block copolymer (SBS), amylene block copolymer (SIS) and chlorinated polyethylene;
and/or, the foaming agent comprises at least one of azodicarbonamide, benzenesulfonylhydrazide, dinitrosopentamethylenetetramine, toluenesulfonylhydrazide and 4, 4' -oxybis-benzenesulfonylhydrazide;
and/or the sensitizer comprises at least one of zinc acetate, zinc stearate, cobalt stearate, zinc oxalate, zinc oxide and barium stearate;
and/or the antioxidant comprises at least one of 2, 6-tertiary butyl-4-methylphenol, bis (3, 5-tertiary butyl-4-hydroxyphenyl) sulfide and pentaerythritol tetrakis [ beta- (3, 5-di-tertiary butyl-4-hydroxyphenyl) propionate ];
and/or the extruder is a single screw extruder;
and/or, the irradiation crosslinking is carried out on an electron accelerator;
and/or, the foaming is carried out in a foaming furnace;
and/or the thickness of the master slice is 0.3-0.7 mm.
9. The cross-linked polyethylene foam material as claimed in claim 8, wherein the temperature of the extrusion is 75-145 ℃;
and/or the rotating speed of a screw of the extruder is 50-90 rpm;
and/or the temperature of a die head of the extruder is 90-145 ℃;
and/or the irradiation dose of the irradiation crosslinking treatment is 25-50 kGy;
and/or the temperature of the foaming furnace is 160-260 ℃;
and/or in the foaming, the residence time of the cross-linked master slice is 0.3-0.5 min.
10. The cross-linked polyethylene foam material according to claim 8, further comprising step (d) after step (c): and (c) polishing the crosslinked polyethylene foam material obtained in the step (c).
11. A method of making a cross-linked polyethylene foam material, said method comprising the steps of:
(a) 60-90 parts by weight of polyethylene;
3-20 parts by weight of maleic anhydride modified rosin resin salt;
5 to 25 parts by weight of an elastomer;
2-20 parts by weight of a foaming agent;
1 to 2 parts by weight of a sensitizer;
placing 0.5-4 parts by weight of antioxidant raw material in an extruder for extrusion to obtain a master slice; and
(b) carrying out irradiation crosslinking treatment on the master slice to obtain a crosslinked master slice; and
(c) and foaming the crosslinked master slice to obtain the crosslinked polyethylene foam material.
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Denomination of invention: Crosslinked polyethylene foam material and its preparation method Effective date of registration: 20230606 Granted publication date: 20220902 Pledgee: Industrial and Commercial Bank of China Limited Pan'an sub branch Pledgor: ZHEJIANG WANLI NEW MATERIALS TECHNOLOGY Co.,Ltd. Registration number: Y2023330001094 |