CN110776684B - Double-layer rotational molding product manufactured based on mucosa temperature difference and preparation method thereof - Google Patents
Double-layer rotational molding product manufactured based on mucosa temperature difference and preparation method thereof Download PDFInfo
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- CN110776684B CN110776684B CN201910924320.9A CN201910924320A CN110776684B CN 110776684 B CN110776684 B CN 110776684B CN 201910924320 A CN201910924320 A CN 201910924320A CN 110776684 B CN110776684 B CN 110776684B
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L23/04—Homopolymers or copolymers of ethene
- C08L23/06—Polyethene
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C41/00—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor
- B29C41/02—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor for making articles of definite length, i.e. discrete articles
- B29C41/04—Rotational or centrifugal casting, i.e. coating the inside of a mould by rotating the mould
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L77/00—Compositions of polyamides obtained by reactions forming a carboxylic amide link in the main chain; Compositions of derivatives of such polymers
- C08L77/02—Polyamides derived from omega-amino carboxylic acids or from lactams thereof
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/002—Physical properties
- C08K2201/003—Additives being defined by their diameter
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
- C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
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- Moulding By Coating Moulds (AREA)
Abstract
The invention discloses a double-layer rotational molding product manufactured based on mucosa temperature difference and a preparation method thereof, relating to the technical field of double-layer rotational molding products and being prepared by mixing the following components in percentage by mass: the powder with the low film temperature is 20-80%, the powder with the high film temperature is 20-80%, the double-layer rotational molding product is prepared by one-time feeding based on the difference of the material mucosa temperatures, the boundary of the section of the double-layer rotational molding product is obvious, and compared with the double-layer rotational molding product prepared by one-time feeding of a melting point and a softening point, the double-layer rotational molding product has better universality and more obvious layering.
Description
Technical Field
The invention relates to the technical field of double-layer rotational molding products, in particular to a double-layer rotational molding product manufactured based on mucosa temperature difference and a preparation method thereof.
Background
Rotational molding is a plastic processing mode which utilizes a rotary mold to process, and the processing process comprises the steps of putting plastic powder or slurry into the mold, rotating or swinging the closed mold on equipment, heating the outside of the mold through open fire or hot air, turning and flowing the plastic powder or slurry inside the mold in a heated state, gradually coating the plastic powder or slurry on the inner surface of the mold after the temperature reaches a mold sticking temperature, melting and condensing, placing the mold in a natural environment or cooling the mold through media such as water, mist, wind and the like, and then removing the mold to take out a product.
Because of the flexibility of rotational molding, the function deficiency of single-layer rotational molding products can be compensated by manufacturing multilayer rotational molding products, in the prior art, multilayer rotational molding products can be manufactured by batch feeding for many times, for example, leisure products and automobiles prepared by multilayer rotational molding in the patent with the publication number of CN102066108A, polyethylene composite materials for electrical breakdown permanent antistatic rotational molding in the patent with the publication number of CN101855079A, multilayer rotational molding products manufactured by multiple molding and the process thereof are reported in the patent with the publication number of CN108044859A, but the batch feeding preparation process is complex and is not suitable for industrial production. For example, patent with publication number CN102601905A is a rotational molding process of a three-layer plastic automobile shell and the automobile shell utilizes the melting point difference between different materials, and patent with publication number CN109664584A is a polyethylene composition for one-step rotational molding foaming and its application method utilizes a cross-linking material for blocking. Because materials rotate in a die in rotational molding, different materials have the tendency of being mixed into uniform materials at the same time, the process for preparing the multilayer rotational molding product by the one-time feeding method does not have the general effect, particles or powder with different melting points and different softening points are mixed for rotational molding, and the multilayer rotational molding product cannot be relatively separated, and although the components of the mixed layer product are different in the thickness direction, the mixed layer product can only be formed mostly.
Disclosure of Invention
The invention provides a double-layer rotational molding product manufactured based on mucosa temperature difference and a preparation method thereof, aiming at overcoming the problems that the prior process for manufacturing the multi-layer rotational molding product by batch feeding for many times is complex, wastes manpower and material resources and is not suitable for industrial production, and the prior process for preparing the multi-layer rotational molding product by one-time feeding has no general effect.
In order to achieve the purpose, the invention adopts the following technical scheme:
a double-layer rotational molding product manufactured based on mucosa temperature difference is prepared by mixing the following components in percentage by mass: 20-80% of low-viscosity film temperature powder and 20-80% of high-viscosity film temperature powder.
In the present invention, the difference in the mucosa temperature of the materials, i.e. the difference in the initial temperature at which the materials begin to adhere to the mold, is a central factor contributing to the delamination of the rotomoulded material, if the mucosa temperatures of the two different materials are different, during the rotomoulding process the material with the low film temperature will adhere to the mold first to form the outer layer and the material with the high film temperature will adhere to the mold later to form the inner layer. And the ratio of the low-film-temperature powder to the high-film-temperature powder is not too small, and if the ratio of the low-film-temperature powder to the high-film-temperature powder is too small, a complete film layer cannot be formed during rotational molding, so that the layering is not uniform.
Preferably, the difference between the mucosa temperature of the low mucosa temperature powder and the mucosa temperature of the high mucosa temperature powder is more than or equal to 10 ℃.
The greater the difference in the mucosa temperature between the two materials, the more pronounced the tendency of the rotomoulded article to form layers, when the mucosa temperature of the two materials exceeds the minimum value of 10 ℃, a substantially divided double-layer rotomoulded article can be formed, and when the mucosa temperature is less than 10 ℃, the boundary line in the fault of the prepared rotomoulded article is very fuzzy, even no boundary line, and the rotomoulded article does not form a double layer.
Preferably, the low mucosa temperature powder is prepared by mixing the following components in percentage by mass: matrix resin: 80-99% of adhesive and 1-20% of adhesive.
The mechanism of attaching the powder to the metal mold is three, namely electrostatic adsorption, fusion bonding and chemical bond formation. The addition of low-melting point substances or substances containing carbonyl, anhydride, ester and the like which can form chemical bonds with metals to the matrix resin can promote the matrix resin to be attached to a mold in advance to form low-film-temperature powder, but the content of the attaching agents cannot be too large, so that the performance of the powder is reduced or the demolding of the product is difficult.
Preferably, the adhesive is one or a combination of two or more selected from polyethylene wax, polypropylene wax, montan wax, paraffin wax, microcrystalline wax, fischer-tropsch wax, ethylene-vinyl acetate copolymer wax, oxidized polyethylene wax, POE, EVA, EAA, polyethylene graft, polypropylene graft, and POE graft.
The adhesive has better compatibility with matrix resin, wherein the wax adhesive can enable the powder to be subjected to melt bonding at low temperature, and the EVA, the EAA and the graft can form chemical bonding force with a metal mold, so that the powder is molded in advance.
Preferably, the particle size D95 of the low mucosa temperature powder is less than or equal to 500um, and the powder fluidity is more than or equal to 25s/100 g.
Because the rotational molding process is a moving process, when the adhesion force of the powder to the mold is larger than the gravity of the powder, the powder can be adhered to the mold, and the melt adhesion force of the powder is larger along with the increase of the temperature, so that the larger the particle size of the powder is, the larger the temperature of the mucosa is. In addition, the smaller the powder flowability is, the shorter the contact time of the powder with the mold during the rolling of the mold is, and the less likely it is to adhere to the mold. Therefore, the low-film-temperature powder is required to have a small particle size and a high powder flowability, and the high-film-temperature powder is required to have a large particle size and a small powder flowability.
Preferably, the high mucosa temperature powder is prepared by mixing the following components in percentage by mass: matrix resin: 80-99 percent of the raw material and 1-20 percent of the parting agent.
The release agent has the functions of promoting the powder to eliminate electrostatic adsorption or smoothening the powder appearance in the powder preparation process, improving the powder flowability and causing the mold temperature to be higher than that of the common powder. Similarly, the content of the release agent needs to be controlled, and the high content of the release agent causes the performance deterioration of the material.
Preferably, the release agent is one or a combination of two or more selected from the group consisting of silicon dioxide, oleamide, erucamide, stearamide, stearic trimethyl ammonium chloride, stearic dimethyl amyl ammonium chloride, alkyl tertiary amine nitrate, trihydroxyethyl methyl quaternary ammonium sulfate, N-hexadecylethyl morpholine ethyl sulfate, sodium alkyl sulfonate, alkyl phosphate, polyacrylate, polystyrene sulfonate, ethoxylated alkylamine, ethoxylated amine laurate, dilauryl phosphate, glycerol monostearate, ethoxylated amine laurate, amphoteric alkyl imidazoline salt, and alkyl amino acid.
In the release agent, silicon dioxide, oleamide, erucamide and stearamide can improve the powder flowability, and dimethyl amyl ammonium stearate, alkyl tertiary amine nitrate, trihydroxyethyl methyl quaternary ammonium sulfate, N-hexadecyl ethyl morpholine sulfate ethyl ester, sodium alkyl sulfonate, alkyl phosphate, polyacrylate, polystyrene sulfonate, ethoxylated alkylamine, ethoxylated amine laurate, dilauryl phosphate, glycerol monostearate, ethoxylated amine laurate, amphoteric alkyl imidazoline salt and alkyl amino acid can eliminate the electrostatic adsorption of the powder.
Preferably, the particle size D10 of the powder with high mucosa temperature is more than or equal to 200um, and the powder fluidity is less than or equal to 25s/100 g.
High film temperature powders require higher film temperatures and therefore require relatively larger powder particle sizes and relatively slower powder flow.
Preferably, the matrix resin is selected from one or a combination of more than two of polyethylene, polypropylene, nylon, polyurethane, polylactic acid, polycarbonate, ABS, polystyrene, polyester, elastomer and derivatives thereof, and flame retardant, foaming, weather resistant, crosslinking and dyeing modified materials thereof.
The matrix resin for preparing the low-film-temperature powder and the high-film-temperature powder can be the same resin or different resins. This is because the same matrix resin can be used to change the temperature of the adhesive film by adding an adhesive or a release agent and changing the particle size, powder flowability, or the like.
A method for preparing a double-layer rotational moulding product manufactured based on mucosa temperature difference, comprising the following steps:
1) mixing and granulating matrix resin and an adhesive to prepare a low-film-temperature material, mixing and granulating the matrix resin and a release agent to prepare a high-film-temperature material, and preparing the high-film-temperature material into powder by a plastic pulverizer; wherein the powder with low mucosa temperature is used as an outer layer material, the powder with high mucosa temperature is used as an inner layer material, and the temperature difference of the mucosa of the two powders is more than or equal to 10 ℃;
2) respectively calculating the feeding amount of the outer layer material and the inner layer material to ensure that the predicted product thickness of the outer layer material is more than or equal to 3mm and the predicted product thickness of the inner layer material is more than or equal to 1 mm;
3) mixing the outer layer material and the inner layer material according to the proportion;
4) putting the mixed material into a mould for rotational moulding; in the processing process, the rotating speed is more than or equal to 10rpm, so that the mixed materials in the die are layered.
In the preparation method of the double-layer rotational molding product, firstly, low-mucosa-temperature powder and high-mucosa-temperature powder with mucosa temperature difference more than or equal to 10 ℃ are prepared according to a specific proportion; then calculating the feeding amount to ensure that the predicted product thickness of the outer layer material is more than or equal to 3mm, and the predicted product thickness of the inner layer material is more than or equal to 1mm, and the product is easy to mix and has poor layering effect when the thickness is less than the predicted product thickness; after the materials are mixed and put into the die, the mixed materials in the die can be promoted to be layered by using a faster rotating speed, so that the layering of the rotational molding product is more obvious.
Therefore, the invention has the following beneficial effects:
(1) the double-layer rotational molding product is prepared by one-time feeding based on the difference of the temperatures of the material mucosa, the boundary of the section of the double-layer rotational molding product is obvious, and the double-layer rotational molding product has better universality and more obvious layering compared with the double-layer rotational molding product prepared by one-time feeding of a melting point and a softening point;
(2) the preparation method is simple, low in cost, free of complex equipment and easy to realize industrial operation.
Detailed Description
The invention is further described with reference to specific embodiments.
Example 1: mixing 90Kg of polyethylene (UR644, Samsung Korea) and 10Kg of EVA (MV1055, Thailand), granulating by a double-screw extruder, and grinding into powder by a plastic grinder to prepare low-viscosity film temperature powder with the particle size D95 being 425um and the powder fluidity being 27s/100 g; mixing 99Kg of polyethylene (UR644, Samsung Korea) and 1Kg of silicon dioxide (AB90, American PQ), granulating by a twin-screw extruder, and grinding by a plastic mill to obtain powder with high viscosity film temperature, wherein the particle size D10 is 210um and the powder fluidity is 20s/100 g; mixing 1.6Kg of low-film-temperature powder and 0.4Kg of high-film-temperature powder, putting the mixture into a rotational molding die, and performing rotational molding under the condition of 15rpm of rotation speed to obtain a double-layer rotational molding product with an outer layer of 3.2mm and an inner layer of 1.4 mm.
Example 2: 99Kg of polyethylene (8446.21, Mobil and high weather resistance) and 1Kg of maleic anhydride grafted POE (493D, DuPont) are mixed and then granulated by a double-screw extruder, and ground by a plastic grinder to prepare low-viscosity film temperature powder with the particle size of D95 being 380um and the powder flowability being 30s/100 g; mixing 80Kg of nylon 6(M24000, Guangdong Meida) and 20Kg of alkyl phosphate (ASA-300, Shanghai Dada), granulating by a double-screw extruder, and grinding by a plastic grinder to prepare high-viscosity film temperature powder with the particle size D10 being 270um and the powder flowability being 24s/100 g; 0.4Kg of low-film-temperature powder and 1.6Kg of high-film-temperature powder are mixed and then put into a rotational molding die, and rotational molding is carried out under the condition of 10rpm of rotation speed, so that the outer layer of the obtained double-layer rotational molding product is 3mm, and the inner layer of the double-layer rotational molding product is 1.1 mm.
Example 3: mixing 80Kg of POE (8540, Doujinghua) and 20Kg of polyethylene wax (2040, Siamese in Thailand), granulating by a double-screw extruder, and grinding by a plastic grinding machine to prepare low-viscosity film temperature powder with the particle size D95 being 500um and the powder flowability being 32s/100 g; mixing 90Kg of polyethylene (5000S, a discoid polyamide), 8Kg of glycerol monostearate (TS-5, Japan flower king) and 2Kg of silicon dioxide (AB90, American PQ), granulating by a double-screw extruder, and grinding by a plastic mill to prepare high-viscosity film temperature powder with the particle size D10 ═ 200um and the powder flowability of 17S/100 g; mixing 1Kg of low-film-temperature powder and 1Kg of high-film-temperature powder, putting the mixture into a rotational molding die, and performing rotational molding at a rotation speed of 20rpm to obtain a double-layer rotational molding product with an outer layer of 3.5mm and an inner layer of 1 mm.
Comparative example 1: polyethylene (UR644, samsung, korea) was ground into powder in a plastic mill to prepare powder a having a particle size D95 of 425um and a powder flowability of 27s/100 g; grinding polyethylene (UR644, Samsung, Korea) into powder in a plastic grinding machine to prepare powder B with a particle size D10 of 210um and powder flowability of 20s/100 g; and mixing the powder A2Kg and the powder B0.4Kg, then putting the mixture into a rotational molding die, and performing rotational molding under the condition of 15rpm of rotating speed to obtain the double-layer rotational molding product with the outer layer being 3.3mm and the inner layer being 1.2 mm.
Comparative example 2: grinding polyethylene (8446.21, Mofu, high weather resistance) in a plastic grinding mill to prepare powder A with the particle size D95 being 380um and the powder fluidity being 30s/100 g; nylon 6(M24000, Guangdong Meida) is ground into powder in a plastic grinding machine to prepare powder B with the particle size D10 being 270um and the powder flowability being 24s/100 g; and mixing the powder A0.4Kg and the powder B2Kg, putting the mixture into a rotational molding die, and performing rotational molding at the rotating speed of 10rpm to obtain the double-layer rotational molding product with the outer layer of 2.8mm and the inner layer of 1.2 mm.
Comparative example 3: POE (8540, Doichun chemical) is ground into powder in a plastic grinding machine to prepare powder A with the particle size D95 being 500um and the powder flowability being 32s/100 g; grinding polyethylene (5000S, discodermized polyamide) into powder in a plastic grinding machine to prepare powder B with the particle diameter D10 being 200um and the powder fluidity being 32S/100 g; and mixing the powder A1Kg and the powder B1Kg, putting the mixture into a rotational molding die, and performing rotational molding at the rotating speed of 20rpm to obtain the double-layer rotational molding product with the outer layer of 3.4mm and the inner layer of 0.7 mm.
Comparative example 4: mixing 80Kg of POE (8540, Taoism chemical) and 20Kg of polyethylene wax (2040, Siamese in Thailand), granulating by a double-screw extruder, and grinding by a plastic grinding machine to prepare powder A with the particle size D95 being 700um and the powder fluidity being 21s/100 g; mixing 90Kg of polyethylene (5000S, a discoid polyamide), 8Kg of glycerol monostearate (TS-5, Japan flower king) and 2Kg of silicon dioxide (AB90, American PQ), granulating by a double-screw extruder, and grinding by a plastic grinder to prepare powder B with the particle size of D10 ═ 190um and the powder fluidity of 34S/100 g; and mixing the powder A1Kg and the powder B1Kg, putting the mixture into a rotational molding die, and performing rotational molding at the rotating speed of 20rpm to obtain the double-layer rotational molding product with the outer layer of 3.1mm and the inner layer of 1.5 mm.
According to the invention, the temperature of the mucosa is measured by using an in-mold thermometer, the particle size of the powder is measured by using a laser particle size distribution instrument, and the flowability of the powder is measured by using ARM standard.
The mucosa temperature difference of the low-film-temperature powder and the high-film-temperature powder prepared in the embodiment and the powder A and the powder B prepared in the comparative example is detected, the end face delamination condition after rotational molding is observed, in order to observe the delamination effect, the low-film-temperature powder and the high-film-temperature powder are made into materials with different colors, and the dyeing granulation technology is in the industry, so that the special attention is not paid in the case. The results are shown in the following table.
From the above table, it can be known that, without adding an adhesive and a release agent, the particle size of the prepared powder and the powder fluidity are too high or too low, so that the temperature difference of the mucosa between the materials is too small, and the inner and outer layer products in the double-layer rotational molding product are too small, which easily causes the mixing of the inner and outer layers of the rotational molding product, so that the end face has no obvious boundary.
It is to be understood that the practice of the invention is not limited to the embodiments described above, and that any variations and/or modifications may be made thereto without departing from the scope of the invention.
In the invention, all parts and percentages are weight units, and all equipment, raw materials and the like can be purchased from the market or are commonly used in the industry, if not specified. Unless otherwise indicated, the examples employ methods that are within the ordinary skill in the art.
Claims (4)
1. A double-layer rotational molding product manufactured based on mucosa temperature difference is characterized by being prepared by mixing the following components in percentage by mass: 20-80% of low mucosa temperature powder and 20-80% of high mucosa temperature powder;
the preparation method comprises the following steps:
1) respectively mixing and granulating the low-viscosity film temperature material and the high-viscosity film temperature material, and then preparing the materials into powder by a plastic pulverizer; wherein the low mucosa temperature powder is used as an outer layer material, and the high mucosa temperature powder is used as an inner layer material; the difference of the mucosa temperature of the low-mucosa-temperature powder and the high-mucosa-temperature powder is more than or equal to 10 ℃; the difference of the mucosa temperature is the difference of the initial temperature of the low-mucosa-temperature powder and the initial temperature of the high-mucosa-temperature powder which begin to be attached to the die;
the low-mucosa-temperature powder is prepared by mixing the following components in percentage by mass: matrix resin: 80-99 percent of adhesive and 1-20 percent of adhesive; the particle size D95 of the low-mucosa-temperature powder is less than or equal to 500um, and the powder fluidity is more than or equal to 25s/100 g; the high mucosa temperature powder is prepared by mixing the following components in percentage by mass: matrix resin: 80-99 percent of release agent and 1-20 percent of release agent; the particle size D10 of the powder with high mucosa temperature is more than or equal to 200um, and the powder fluidity is less than or equal to 25s/100 g;
2) respectively calculating the feeding amount of the outer layer material and the inner layer material to ensure that the predicted product thickness of the outer layer material is more than or equal to 3mm and the predicted product thickness of the inner layer material is more than or equal to 1 mm;
3) mixing the outer layer material and the inner layer material according to the proportion;
4) putting the mixed material into a mould for rotational moulding; in the processing process, the rotating speed is more than or equal to 10rpm, so that the mixed materials in the die are layered; and during rotational molding, the low-film-temperature powder and the high-film-temperature powder are respectively formed into an outer layer and an inner layer on a mold.
2. The double-layered rotomoulded article made based on difference in temperature of adhesive film according to claim 1, wherein the adhesive agent is one or a combination of two or more selected from polyethylene wax, polypropylene wax, montan wax, microcrystalline wax, fischer-tropsch wax, ethylene-vinyl acetate copolymer wax, oxidized polyethylene wax, POE, EAA, polyethylene graft, polypropylene graft, and POE graft.
3. The bi-layer rotomolded article based on mucosal temperature differential fabrication of claim 1, wherein the release agent is selected from the group consisting of one or a combination of two or more of silica, oleamide, erucamide, stearamide, trimethylammonium stearate, dimethylpentylammonium stearate, tertiary alkyl amine nitrate, methyl trihydroxyethylmethyl quaternary ammonium sulfate, ethyl N, N-hexadecylethylmorpholine sulfate, sodium alkylsulfate, alkylphosphate, polyacrylate, polystyrene sulfonate, ethoxylated alkylamine, ethoxylated laurylamine, dilauryl phosphate, glycerol monostearate, amphoteric alkylimidazoline salt, and alkyl amino acids.
4. The double-layer rotational molding product manufactured based on mucosa temperature difference as claimed in claim 1, wherein the matrix resin is selected from polyethylene, polypropylene, nylon, polyurethane, polylactic acid, polycarbonate, ABS, polystyrene, elastomer and derivatives thereof, and one or more of flame retardant, foaming, weather resistant, cross-linking, and dyeing modified materials thereof.
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| CN115418043B (en) * | 2022-08-24 | 2024-01-30 | 浙江瑞堂塑料科技股份有限公司 | Rotational molding composite material with large meteor-like patterns and molding process thereof |
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