CN112898686A - Sprayable polypropylene-polystyrene alloy material and preparation method thereof - Google Patents
Sprayable polypropylene-polystyrene alloy material and preparation method thereof Download PDFInfo
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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
- C08L23/10—Homopolymers or copolymers of propene
- C08L23/14—Copolymers of propene
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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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
- B29C48/50—Details of extruders
- B29C48/505—Screws
- B29C48/625—Screws characterised by the ratio of the threaded length of the screw to its outside diameter [L/D ratio]
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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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/92—Measuring, controlling or regulating
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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
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92504—Controlled parameter
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
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- B29C2948/00—Indexing scheme relating to extrusion moulding
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- 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
- C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend
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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
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Abstract
The invention discloses a sprayable polypropylene-polystyrene alloy material, which consists of the following raw materials in percentage by weight: 50-70 wt% of polypropylene, 15-35 wt% of polystyrene, 5-15 wt% of compatibilizer, 5-20 wt% of ethylene-acrylic copolymer and 0.2-0.5 wt% of antioxidant; also discloses a preparation method of the sprayable polypropylene-polystyrene alloy material. Based on a polypropylene-polystyrene alloy system, the invention adopts ethylene-methyl acrylate-glycidyl methacrylate as a compatibilizer and is matched with an ethylene-acrylic acid copolymer, so that the blending system has a strong polar group at a specific extrusion region temperature, the blending compatibility is effectively improved, the interfacial tension of the blending system is reduced, the adhesive force among the copolymers is increased, a stable blending system structure is formed, the surface polarity of an alloy material is improved, and the adhesive force to paint is improved.
Description
Technical Field
The invention relates to the technical field of modification of high polymer materials, in particular to a sprayable polypropylene-polystyrene alloy material and a preparation method thereof.
Background
Polypropylene (PP) is one of the mainstream materials in the field of plastic toy manufacturing at present, and a toy part made of polypropylene after paint spraying has good appearance and can generate good visual effect. However, the PP material is a non-polar material, so that the surface energy of the PP material is low, and the paint has poor wettability and low adhesion. At present, in order to improve the adhesive force of paint on the surface of a polypropylene material, a workpiece is usually subjected to surface treatment before oil spraying, and the main surface treatment modes comprise chemical oxidation treatment, corona treatment, flame treatment and the like; particularly, for some toy parts with complex structures, if the surface treatment is not in place, the adhesion force of paint is directly influenced, and the phenomenon of paint falling is often caused.
In order to improve the surface polarity of the polypropylene material, the polypropylene material is often required to be modified.
For example, chinese patent (CN101659766B) describes a low shrinkage sprayable PP/PS blend alloy material, which mainly teaches the compatibilization of PP/PS alloy by polypropylene grafted compatibilizer to reduce shrinkage and improve surface polarity.
Chinese patent (CN103589060B) describes a glass fiber reinforced polypropylene/polystyrene alloy material, and mainly describes the compatibilization of PP/PS alloy filling system by grafting polypropylene and the improvement of the surface polarity of PP material by using solid bisphenol A epoxy resin as a spraying promoter.
Chinese patent (CN103030893A) introduces a modified polypropylene composite material, which mainly teaches that a PP/PS composite system is modified by using POE/EPDM/propylene-alpha olefin/styrene block copolymer as a toughening agent and immobilized aluminum trichloride as a catalyst, and aims at modifying in directions of low shrinkage, low density and high impact.
Chinese patent (CN102757596B) describes a polypropylene/polystyrene alloy material, and mainly teaches that PP/PS alloy system is compatibilized by SEBS, and LDPE, fluorescent whitening agent and nucleating agent are used to obtain high glossiness, low shrinkage, high impact resistance and other properties.
However, the above patents do not mention the use of ethylene-methyl acrylate-glycidyl methacrylate (E-MA-GMA) as a compatibilizer to compatibilize PP/PS alloys to improve the surface polarity of the material, nor do they mention the use of ethylene-acrylic copolymers to compatibilize toughen and improve the surface polarity of the material.
Therefore, how to optimize the formulation and characteristic parameters of the polypropylene-polystyrene alloy material to improve the surface polarity and performance thereof becomes a major technical problem.
Disclosure of Invention
In order to overcome the technical problems, the invention discloses a sprayable polypropylene-polystyrene alloy material; also discloses a preparation method of the sprayable polypropylene-polystyrene alloy material.
The technical scheme adopted by the invention for realizing the purpose is as follows:
a sprayable polypropylene-polystyrene alloy material comprises the following raw materials in percentage by weight: 50-70 wt% of polypropylene, 15-35 wt% of polystyrene, 5-15 wt% of compatibilizer, 5-20 wt% of ethylene-acrylic copolymer and 0.2-0.5 wt% of antioxidant.
The sprayable polypropylene-polystyrene alloy material is characterized in that the compatibilizer is an ethylene-methyl acrylate-glycidyl methacrylate terpolymer, and the melt index of the compatibilizer is 5-10g/10min measured at 190 ℃ under the condition of 2.16 kg.
The sprayable polypropylene-polystyrene alloy material comprises 20-30% of methyl acrylate of the compatibilizer, and 1-10% of glycidyl methacrylate of the compatibilizer.
The sprayable polypropylene-polystyrene alloy material is characterized in that the ethylene-acrylic copolymer is at least one of ethylene-ethyl acrylate copolymer, ethylene-methyl acrylate copolymer, ethylene-butyl acrylate copolymer and ethylene-acrylic acid copolymer;
optionally, the ethylene-ethyl acrylate copolymer has an ethyl acrylate content of 15-25% and a melt index of 5-20g/10min measured at 190 ℃ under 2.16 kg;
optionally, the ethylene-methyl acrylate copolymer has a methyl acrylate content of 20-24% and a melt index of 5-20g/10min measured at 190 ℃ under 2.16 kg;
optionally, the ethylene-butyl acrylate copolymer has a butyl acrylate content of 15-25% and a melt index of 5-20g/10min measured at 190 ℃ under 2.16 kg;
optionally, the ethylene-acrylic acid copolymer has an acrylic acid content of 5 to 15% and a melt index of 5 to 25g/10min measured at 190 ℃ under 2.16 kg.
The sprayable polypropylene-polystyrene alloy material is characterized in that the polypropylene is a polypropylene copolymer, and the melt index is 3-30g/10min measured at 230 ℃ under the condition of 2.16 kg.
The sprayable polypropylene-polystyrene alloy material is characterized in that the polystyrene is high impact polystyrene, and the melt index is 3-10g/10min measured at 200 ℃ and under the condition of 5 kg.
The sprayable polypropylene-polystyrene alloy material is characterized in that the antioxidant is a mixture of a multi-component hindered phenol main antioxidant and an organic phosphite auxiliary antioxidant.
A preparation method of a sprayable polypropylene-polystyrene alloy material is used for preparing the sprayable polypropylene-polystyrene alloy material;
the preparation method comprises the following steps:
(1) weighing the raw materials of the components according to the weight percentage;
(2) adding the raw materials of the components in the step (1) into a high-speed stirrer, and uniformly mixing to obtain a blended material;
(3) and (3) adding the blending material obtained in the step (2) into a double-screw extruder, and performing blending, plasticizing, extruding and granulating to obtain the sprayable polypropylene-polystyrene alloy material.
The preparation method of the sprayable polypropylene-polystyrene alloy material is characterized in that the set temperature of each zone in the twin-screw extruder is as follows: the temperature of the first zone is 120-plus-130 ℃, the temperature of the second zone is 160-plus-170 ℃, the temperature of the third zone is 180-plus-190 ℃, the temperature of the fourth zone is 180-plus-190 ℃, the temperature of the fifth zone is 200-plus-210 ℃, the temperature of the sixth zone is 200-plus-210 ℃, the temperature of the seventh zone is 200-plus-210 ℃, the temperature of the eighth zone is 190-plus-200 ℃, the temperature of the ninth zone is 190-plus-200 ℃, the temperature of the tenth zone is 190-plus-200 ℃, and the temperature of the head is 200-plus-210 ℃.
The preparation method of the sprayable polypropylene-polystyrene alloy material comprises the steps of enabling the length-diameter ratio of the double-screw extruder to be 40: 1-52: 1, and enabling the screw rotating speed to be 400-500 rpm.
The invention has the following beneficial effects:
(1) the invention is based on the adoption of a polypropylene-polystyrene alloy system, and the polystyrene has the advantages of good rigidity, small molding shrinkage and good paint adhesion, so that the performance of polypropylene can be optimized and improved in a matching way;
(2) ethylene-methyl acrylate-glycidyl methacrylate terpolymer (E-MA-GMA) is used as a compatibilizer, and the compatibilizer has strong polar groups, so that the blending compatibility of polypropylene, polystyrene and ethylene-acrylic acid copolymer is effectively improved, the interfacial tension of a blending system is reduced, the copolymer is prevented from being condensed, and a stable phase morphology structure is formed; meanwhile, the copolymer is a polarity reinforcing agent, so that the adhesive force among the copolymers is increased to form a stable blending system structure, the surface polarity of the alloy material can be improved, and the adhesive force to paint is improved;
(3) because the ethylene-acrylic acid copolymer has polar groups and excellent performance, the alloy material can be promoted to achieve the effects of compatibilization and toughening, and the adhesion of the paint can be promoted well;
(4) the set temperature of each area in the double-screw extruder is reasonably controlled to promote the mutual crosslinking and plasticization of the copolymers in the blending system, avoid the coagulation of the copolymers, improve the compatibility of the alloy material and improve the surface polarity of the alloy material and the adhesion to paint;
(5) the sprayable polypropylene-polystyrene alloy material prepared by the invention has excellent sprayable performance, mechanical property, processability and the like, effectively solves the problems that the prior toy product made of polypropylene needs to be pretreated before spraying and the paint is easy to fall after spraying, can greatly improve the production benefit and the product quality, has simple preparation process, is convenient to purchase and can directly realize industrial production, and the raw materials are sold as industrial-grade products.
Detailed Description
The present invention is further illustrated by the following specific examples, which are intended to facilitate the understanding and appreciation of the technical solutions of the present invention, rather than to limit the invention thereto.
The invention provides a sprayable polypropylene-polystyrene alloy material which comprises the following raw materials in percentage by weight: 50-70 wt% of polypropylene (PP), 15-35 wt% of Polystyrene (PS), 5-15 wt% of compatibilizer, 5-20 wt% of ethylene-acrylic copolymer and 0.2-0.5 wt% of antioxidant.
Preferably, the compatibilizer is ethylene-methyl acrylate-glycidyl methacrylate terpolymer (E-MA-GMA), and the Melt Index (MI) of the compatibilizer is 5-10g/10min measured at 190 ℃ under the condition of 2.16 kg; preferably, the content of methyl acrylate in the compatibilizer is 20-30%, and the content of glycidyl methacrylate in the compatibilizer is 1-10%.
Preferably, the ethylene-acrylic acid copolymer is at least one of ethylene-ethyl acrylate copolymer, ethylene-methyl acrylate copolymer, ethylene-butyl acrylate copolymer and ethylene-acrylic acid copolymer;
optionally, the ethylene-ethyl acrylate copolymer has an ethyl acrylate content of 15-25% and a Melt Index (MI) of 5-20g/10min measured at 190 ℃ under 2.16 kg;
optionally, the ethylene-methyl acrylate copolymer has a methyl acrylate content of 20 to 24% and a Melt Index (MI) of 5 to 20g/10min measured at 190 ℃ under 2.16 kg;
optionally, the ethylene-butyl acrylate copolymer has a butyl acrylate content of 15 to 25% and a Melt Index (MI) of 5 to 20g/10min measured at 190 ℃ under 2.16 kg;
optionally, the ethylene-acrylic acid copolymer has an acrylic acid content of 5 to 15% and a Melt Index (MI) of 5 to 25g/10min measured at 190 ℃ under 2.16 kg.
Preferably, the polypropylene (PP) is a co-polypropylene and has a Melt Index (MI) of 3-30g/10min measured at 230 ℃ under 2.16 kg; preferably, the polypropylene is a tough and balanced copolymer type high crystalline polypropylene, such as BX3500 grade copolymer type high crystalline polypropylene of Korean SK.
Preferably, the Polystyrene (PS) is High Impact Polystyrene (HIPS) and the Melt Index (MI) is 3-10g/10min measured at 200 ℃ under the condition of 5 kg; preferably, the polystyrene is selected from rigid and tough well-balanced polystyrene of grade HP9450 of Taiwan chemical fiber company.
Preferably, the antioxidant is a mixture of a multi-component hindered phenol main antioxidant and an organic phosphite ester auxiliary antioxidant; preferably, the weight percentage of the multi-element hindered phenol main antioxidant to the organic phosphite ester auxiliary antioxidant is 2: 1; the multi-component hindered phenol main antioxidant is an antioxidant 1010, and the organic phosphite ester auxiliary antioxidant is an antioxidant 168.
The invention also discloses a preparation method of the sprayable polypropylene-polystyrene alloy material, which is used for preparing the sprayable polypropylene-polystyrene alloy material,
the preparation method comprises the following steps:
(1) weighing the raw materials of the components according to the weight percentage;
(2) adding the raw materials of the components in the step (1) into a high-speed stirrer, and uniformly mixing to obtain a blended material;
(3) and (3) adding the blending material obtained in the step (2) into a double-screw extruder, and performing blending, plasticizing, extruding and granulating to obtain the sprayable polypropylene-polystyrene alloy material.
Preferably, the set temperatures of the zones in the twin-screw extruder are: the temperature of the first zone is 120-plus-130 ℃, the temperature of the second zone is 160-plus-170 ℃, the temperature of the third zone is 180-plus-190 ℃, the temperature of the fourth zone is 180-plus-190 ℃, the temperature of the fifth zone is 200-plus-210 ℃, the temperature of the sixth zone is 200-plus-210 ℃, the temperature of the seventh zone is 200-plus-210 ℃, the temperature of the eighth zone is 190-plus-200 ℃, the temperature of the ninth zone is 190-plus-200 ℃, the temperature of the tenth zone is 190-plus-200 ℃, and the temperature of the head is 200-plus-210 ℃.
Further, the length-diameter ratio of the double-screw extruder is more than or equal to 40:1 and less than or equal to 52:1, and the screw rotating speed is 400-500 rpm.
The preparation process according to the invention is now described in detail in the following examples:
example 1:
the embodiment discloses a preparation method of a sprayable polypropylene-polystyrene alloy material, which comprises the following steps:
(1) weighing a mixture of 61% of polypropylene (MI is 10g/10min), 20% of high impact polystyrene (MI is 3g/10min), 6% of ethylene-methyl acrylate-glycidyl methacrylate (MI is 10g/10min), 13% of ethylene-methyl acrylate (MI is 10g/10min) and 0.3% of antioxidant 1010 and antioxidant 168 in a mass percentage of 2: 1;
wherein the ethylene-methyl acrylate-glycidyl methacrylate has a methyl acrylate content of 20% and a glycidyl methacrylate content of 3%; the ethylene-methyl acrylate had a methyl acrylate content of 20%;
(2) adding the raw materials of the components in the step (1) into a high-speed stirrer, and uniformly mixing to obtain a blended material;
(3) adding the blending material obtained in the step (2) into a double-screw extruder, and performing blending, plasticizing, extruding and granulating to obtain a sprayable polypropylene-polystyrene alloy material;
wherein the length-diameter ratio of the double-screw extruder is L/D44: 1, the rotating speed of a screw is 450 rpm; the set temperatures for each zone were: the temperature of the first zone is 120 ℃, the temperature of the second zone is 160 ℃, the temperature of the third zone is 180 ℃, the temperature of the fourth zone is 190 ℃, the temperature of the fifth zone is 205 ℃, the temperature of the sixth zone is 205 ℃, the temperature of the seventh zone is 205 ℃, the temperature of the eighth zone is 195 ℃, the temperature of the ninth zone is 195 ℃, the temperature of the tenth zone is 195 ℃ and the temperature of the machine head is 205 ℃.
The sprayable polypropylene-polystyrene alloy material prepared in example 1 was subjected to basic performance parameter measurement, and the detailed test results are shown in table 1.
Example 2:
the embodiment discloses a preparation method of a sprayable polypropylene-polystyrene alloy material, which comprises the following steps:
(1) weighing a mixture of 57% of polypropylene (MI is 10g/10min), 25% of high impact polystyrene (MI is 3g/10min), 6% of ethylene-methyl acrylate-glycidyl methacrylate (MI is 10g/10min), 12% of ethylene-methyl acrylate (MI is 10g/10min) and 0.3% of antioxidant 1010 and antioxidant 168 in a mass percentage of 2: 1;
wherein the ethylene-methyl acrylate-glycidyl methacrylate has a methyl acrylate content of 20% and a glycidyl methacrylate content of 3%; the ethylene-methyl acrylate had a methyl acrylate content of 20%;
(2) adding the raw materials of the components in the step (1) into a high-speed stirrer, and uniformly mixing to obtain a blended material;
(3) adding the blending material obtained in the step (2) into a double-screw extruder, and performing blending, plasticizing, extruding and granulating to obtain a sprayable polypropylene-polystyrene alloy material;
wherein the length-diameter ratio of the double-screw extruder is L/D44: 1, the rotating speed of a screw is 450 rpm; the set temperatures for each zone were: the temperature of the first zone is 120 ℃, the temperature of the second zone is 160 ℃, the temperature of the third zone is 180 ℃, the temperature of the fourth zone is 190 ℃, the temperature of the fifth zone is 205 ℃, the temperature of the sixth zone is 205 ℃, the temperature of the seventh zone is 205 ℃, the temperature of the eighth zone is 195 ℃, the temperature of the ninth zone is 195 ℃, the temperature of the tenth zone is 195 ℃ and the temperature of the machine head is 205 ℃.
The sprayable polypropylene-polystyrene alloy material prepared in example 2 was subjected to basic performance parameter measurement, and the detailed test results are shown in table 1.
Example 3:
the embodiment discloses a preparation method of a sprayable polypropylene-polystyrene alloy material, which comprises the following steps:
(1) weighing a mixture of 53% of polypropylene (MI is 10g/10min), 30% of high impact polystyrene (MI is 3g/10min), 7% of ethylene-methyl acrylate-glycidyl methacrylate (MI is 10g/10min), 10% of ethylene-methyl acrylate (MI is 10g/10min) and 0.3% of antioxidant 1010 and antioxidant 168 in a mass percentage of 2: 1;
wherein the ethylene-methyl acrylate-glycidyl methacrylate has a methyl acrylate content of 25% and a glycidyl methacrylate content of 3%; the ethylene-methyl acrylate had a methyl acrylate content of 15%;
(2) adding the raw materials of the components in the step (1) into a high-speed stirrer, and uniformly mixing to obtain a blended material;
(3) adding the blending material obtained in the step (2) into a double-screw extruder, and performing blending, plasticizing, extruding and granulating to obtain a sprayable polypropylene-polystyrene alloy material;
wherein the length-diameter ratio of the double-screw extruder is L/D44: 1, the rotating speed of a screw is 450 rpm; the set temperatures for each zone were: the temperature of the first zone is 120 ℃, the temperature of the second zone is 160 ℃, the temperature of the third zone is 180 ℃, the temperature of the fourth zone is 190 ℃, the temperature of the fifth zone is 205 ℃, the temperature of the sixth zone is 205 ℃, the temperature of the seventh zone is 205 ℃, the temperature of the eighth zone is 195 ℃, the temperature of the ninth zone is 195 ℃, the temperature of the tenth zone is 195 ℃ and the temperature of the machine head is 205 ℃.
The sprayable polypropylene-polystyrene alloy material prepared in example 3 was subjected to basic performance parameter measurement, and the detailed test results are shown in table 1.
Example 4:
the embodiment discloses a preparation method of a sprayable polypropylene-polystyrene alloy material, which comprises the following steps:
(1) weighing a mixture of 61% of polypropylene (MI is 10g/10min), 20% of high impact polystyrene (MI is 3g/10min), 6% of ethylene-methyl acrylate-glycidyl methacrylate (MI is 10g/10min), 13% of ethylene-ethyl acrylate (MI is 10g/10min) and 0.3% of antioxidant 1010 and antioxidant 168 in a mass percentage of 2: 1;
wherein the ethylene-methyl acrylate-glycidyl methacrylate has a methyl acrylate content of 25% and a glycidyl methacrylate content of 3%; the ethyl acrylate content of the ethylene ethyl acrylate was 15%;
(2) adding the raw materials of the components in the step (1) into a high-speed stirrer, and uniformly mixing to obtain a blended material;
(3) adding the blending material obtained in the step (2) into a double-screw extruder, and performing blending, plasticizing, extruding and granulating to obtain a sprayable polypropylene-polystyrene alloy material;
wherein the length-diameter ratio of the double-screw extruder is L/D (48): 1, the rotating speed of a screw is 400 rpm; the set temperatures for each zone were: the temperature of the first zone is 120 ℃, the temperature of the second zone is 160 ℃, the temperature of the third zone is 180 ℃, the temperature of the fourth zone is 180 ℃, the temperature of the fifth zone is 200 ℃, the temperature of the sixth zone is 200 ℃, the temperature of the seventh zone is 200 ℃, the temperature of the eighth zone is 200 ℃, the temperature of the ninth zone is 190 ℃, the temperature of the tenth zone is 190 ℃, and the temperature of the machine head is 200 ℃.
The sprayable polypropylene-polystyrene alloy material prepared in example 4 was subjected to basic performance parameter measurement, and the detailed test results are shown in table 1.
Example 5:
the embodiment discloses a preparation method of a sprayable polypropylene-polystyrene alloy material, which comprises the following steps:
(1) weighing a mixture of 57% of polypropylene (MI is 10g/10min), 25% of high impact polystyrene (MI is 3g/10min), 6% of ethylene-methyl acrylate-glycidyl methacrylate (MI is 8g/10min), 12% of ethylene-ethyl acrylate (MI is 15g/10min) and 0.3% of antioxidant 1010 and antioxidant 168 in a mass percentage of 2: 1;
wherein the ethylene-methyl acrylate-glycidyl methacrylate has a methyl acrylate content of 30% and a glycidyl methacrylate content of 5%; the ethyl acrylate content of the ethylene ethyl acrylate was 20%;
(2) adding the raw materials of the components in the step (1) into a high-speed stirrer, and uniformly mixing to obtain a blended material;
(3) adding the blending material obtained in the step (2) into a double-screw extruder, and performing blending, plasticizing, extruding and granulating to obtain a sprayable polypropylene-polystyrene alloy material;
wherein the length-diameter ratio of the double-screw extruder is L/D (48): 1, the rotating speed of a screw is 400 rpm; the set temperatures for each zone were: the temperature of the first zone is 120 ℃, the temperature of the second zone is 160 ℃, the temperature of the third zone is 180 ℃, the temperature of the fourth zone is 180 ℃, the temperature of the fifth zone is 200 ℃, the temperature of the sixth zone is 200 ℃, the temperature of the seventh zone is 200 ℃, the temperature of the eighth zone is 200 ℃, the temperature of the ninth zone is 190 ℃, the temperature of the tenth zone is 190 ℃, and the temperature of the machine head is 200 ℃.
The sprayable polypropylene-polystyrene alloy material prepared in example 5 was subjected to basic performance parameter measurement, and the detailed test results are shown in table 1.
Example 6:
the embodiment discloses a preparation method of a sprayable polypropylene-polystyrene alloy material, which comprises the following steps:
(1) weighing a mixture of 53% of polypropylene (MI is 10g/10min), 30% of high impact polystyrene (MI is 3g/10min), 7% of ethylene-methyl acrylate-glycidyl methacrylate (MI is 8g/10min), 10% of ethylene-ethyl acrylate (MI is 15g/10min) and 0.3% of antioxidant 1010 and antioxidant 168 in a mass percentage of 2: 1;
wherein the ethylene-methyl acrylate-glycidyl methacrylate has a methyl acrylate content of 30% and a glycidyl methacrylate content of 5%; the ethyl acrylate content of the ethylene ethyl acrylate was 20%;
(2) adding the raw materials of the components in the step (1) into a high-speed stirrer, and uniformly mixing to obtain a blended material;
(3) adding the blending material obtained in the step (2) into a double-screw extruder, and performing blending, plasticizing, extruding and granulating to obtain a sprayable polypropylene-polystyrene alloy material;
wherein the length-diameter ratio of the double-screw extruder is L/D (48): 1, the rotating speed of a screw is 400 rpm; the set temperatures for each zone were: the temperature of the first zone is 120 ℃, the temperature of the second zone is 160 ℃, the temperature of the third zone is 180 ℃, the temperature of the fourth zone is 180 ℃, the temperature of the fifth zone is 200 ℃, the temperature of the sixth zone is 200 ℃, the temperature of the seventh zone is 200 ℃, the temperature of the eighth zone is 200 ℃, the temperature of the ninth zone is 190 ℃, the temperature of the tenth zone is 190 ℃, and the temperature of the machine head is 200 ℃.
The sprayable polypropylene-polystyrene alloy material prepared in example 6 was subjected to basic performance parameter measurements, and the detailed test results are shown in table 1.
TABLE 1 results of testing basic Performance parameters of the sprayable Polypropylene-polystyrene alloy materials of examples 1-6
From the measurement results in table 1, the sprayable polypropylene-polystyrene alloy material and the preparation method thereof of the present invention have the following advantages:
(1) the invention is based on the adoption of a polypropylene-polystyrene alloy system, and the polystyrene has the advantages of good rigidity, small molding shrinkage and good paint adhesion, so that the performance of polypropylene can be optimized and improved in a matching way;
(2) ethylene-methyl acrylate-glycidyl methacrylate terpolymer (E-MA-GMA) is used as a compatibilizer, and the compatibilizer has strong polar groups, so that the blending compatibility of polypropylene, polystyrene and ethylene-acrylic acid copolymer is effectively improved, the interfacial tension of a blending system is reduced, the copolymer is prevented from being condensed, and a stable phase morphology structure is formed; meanwhile, the copolymer is a polarity reinforcing agent, so that the adhesive force among the copolymers is increased to form a stable blending system structure, the surface polarity of the alloy material can be improved, and the adhesive force to paint is improved;
(3) because the ethylene-acrylic acid copolymer has polar groups and excellent performance, the alloy material can be promoted to achieve the effects of compatibilization and toughening, and the adhesion of the paint can be promoted well;
(4) the set temperature of each area in the double-screw extruder is reasonably controlled to promote the mutual crosslinking and plasticization of the copolymers in the blending system, avoid the coagulation of the copolymers, improve the compatibility of the alloy material and improve the surface polarity of the alloy material and the adhesion to paint;
(5) the sprayable polypropylene-polystyrene alloy material prepared by the invention has excellent sprayable performance, mechanical property, processability and the like, effectively solves the problems that the prior toy product made of polypropylene needs to be pretreated before spraying and the paint is easy to fall after spraying, can greatly improve the production benefit and the product quality, has simple preparation process, is convenient to purchase and can directly realize industrial production, and the raw materials are sold as industrial-grade products.
The foregoing is merely a preferred embodiment of the invention and is not intended to limit the invention in any manner. Those skilled in the art can make many possible variations and modifications to the invention using the above disclosed technical means and teachings, or can modify equivalent embodiments with equivalent variations, without departing from the scope of the invention. Therefore, all equivalent changes made according to the shape, structure and principle of the present invention should be covered by the protection scope of the present invention without departing from the contents of the technical scheme of the present invention.
Claims (10)
1. The sprayable polypropylene-polystyrene alloy material is characterized by comprising the following raw materials in percentage by weight: 50-70 wt% of polypropylene, 15-35 wt% of polystyrene, 5-15 wt% of compatibilizer, 5-20 wt% of ethylene-acrylic copolymer and 0.2-0.5 wt% of antioxidant.
2. The sprayable polypropylene-polystyrene alloy material of claim 1, wherein the compatibilizer is an ethylene-methyl acrylate-glycidyl methacrylate terpolymer and has a melt index of 5-10g/10min measured at 190 ℃ under 2.16 kg.
3. The sprayable polypropylene-polystyrene alloy material of claim 2, wherein the compatibilizer has a methyl acrylate content of 20-30% and a glycidyl methacrylate content of 1-10%.
4. The sprayable polypropylene-polystyrene alloy material of claim 3, wherein the ethylene-acrylic acid copolymer is at least one of an ethylene-ethyl acrylate copolymer, an ethylene-methyl acrylate copolymer, an ethylene-butyl acrylate copolymer, an ethylene-acrylic acid copolymer;
optionally, the ethylene-ethyl acrylate copolymer has an ethyl acrylate content of 15-25% and a melt index of 5-20g/10min measured at 190 ℃ under 2.16 kg;
optionally, the ethylene-methyl acrylate copolymer has a methyl acrylate content of 20-24% and a melt index of 5-20g/10min measured at 190 ℃ under 2.16 kg;
optionally, the ethylene-butyl acrylate copolymer has a butyl acrylate content of 15-25% and a melt index of 5-20g/10min measured at 190 ℃ under 2.16 kg;
optionally, the ethylene-acrylic acid copolymer has an acrylic acid content of 5 to 15% and a melt index of 5 to 25g/10min measured at 190 ℃ under 2.16 kg.
5. The sprayable polypropylene-polystyrene alloy material of claim 4, wherein the polypropylene is a co-polypropylene and has a melt index of 3 to 30g/10min measured at 230 ℃ under 2.16 kg.
6. The sprayable polypropylene-polystyrene alloy material of claim 5, wherein the polystyrene is a high impact polystyrene and has a melt index of 3 to 10g/10min measured at 200 ℃ under 5 kg.
7. The sprayable polypropylene-polystyrene alloy material of claim 6, wherein the antioxidant is a mixture of a primary multi-hindered phenol antioxidant and an auxiliary organic phosphite antioxidant.
8. A method for preparing a sprayable polypropylene-polystyrene alloy material, which is used for preparing the sprayable polypropylene-polystyrene alloy material as defined in any one of claims 1 to 7;
the preparation method comprises the following steps:
(1) weighing the raw materials of the components according to the weight percentage;
(2) adding the raw materials of the components in the step (1) into a high-speed stirrer, and uniformly mixing to obtain a blended material;
(3) and (3) adding the blending material obtained in the step (2) into a double-screw extruder, and performing blending, plasticizing, extruding and granulating to obtain the sprayable polypropylene-polystyrene alloy material.
9. The process for preparing a sprayable polypropylene-polystyrene alloy material according to claim 8, wherein the set temperature of each zone in the twin-screw extruder is: the temperature of the first zone is 120-plus-130 ℃, the temperature of the second zone is 160-plus-170 ℃, the temperature of the third zone is 180-plus-190 ℃, the temperature of the fourth zone is 180-plus-190 ℃, the temperature of the fifth zone is 200-plus-210 ℃, the temperature of the sixth zone is 200-plus-210 ℃, the temperature of the seventh zone is 200-plus-210 ℃, the temperature of the eighth zone is 190-plus-200 ℃, the temperature of the ninth zone is 190-plus-200 ℃, the temperature of the tenth zone is 190-plus-200 ℃, and the temperature of the head is 200-plus-210 ℃.
10. The method for preparing sprayable polypropylene-polystyrene alloy material according to claim 9, wherein the length-diameter ratio of the twin-screw extruder is 40:1 to 52:1, and the screw rotation speed is 400-500 rpm.
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