CN107501841B - Sandwich injection foaming high-weather-resistance ABS (acrylonitrile butadiene styrene) microcellular foam and preparation method thereof - Google Patents
Sandwich injection foaming high-weather-resistance ABS (acrylonitrile butadiene styrene) microcellular foam and preparation method thereof Download PDFInfo
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- 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
- C08K5/00—Use of organic ingredients
- C08K5/04—Oxygen-containing compounds
- C08K5/13—Phenols; Phenolates
- C08K5/134—Phenols containing ester groups
- C08K5/1345—Carboxylic esters of phenolcarboxylic acids
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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
- B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
- B29C44/02—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of definite length, i.e. discrete articles
- B29C44/04—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of definite length, i.e. discrete articles consisting of at least two parts of chemically or physically different materials, e.g. having different densities
- B29C44/06—Making multilayered articles
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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
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
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- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/32—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof from compositions containing microballoons, e.g. syntactic foams
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- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
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- C08K5/51—Phosphorus bound to oxygen
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- C08J2203/00—Foams characterized by the expanding agent
- C08J2203/22—Expandable microspheres, e.g. Expancel®
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- C—CHEMISTRY; METALLURGY
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- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2355/00—Characterised by the use of homopolymers or copolymers, obtained by polymerisation reactions only involving carbon-to-carbon unsaturated bonds, not provided for in groups C08J2323/00 - C08J2353/00
- C08J2355/02—Acrylonitrile-Butadiene-Styrene [ABS] polymers
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- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
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Abstract
The invention provides a sandwich injection foaming high-weatherability ABS microporous foam and a preparation method thereof. The invention provides a method for preparing an ABS foam composite material with a sandwich structure, which adopts a special injection molding process, adopts a small amount of ASA resin with strong weather resistance to greatly make up for the defect of poor weather resistance of ABS, overcomes the technical defect of high cost of ABS composite materials due to poor weather resistance of ABS in the prior art, further improves the weather resistance of ABS resin materials, simultaneously reduces the use cost of raw materials, has a simple process scheme, and is suitable for large-scale production.
Description
Technical Field
The invention relates to the field of processing of polymer composite materials, in particular to high-weather-resistance ABS (acrylonitrile butadiene styrene) microcellular foam foamed by sandwich injection and a preparation method thereof.
Background
ABS is a general thermoplastic engineering plastic developed in the 40 th century, is a plastic variety with very excellent comprehensive mechanical properties, has the characteristics of good rigidity, hardness and processing fluidity and high toughness, and can be subjected to injection molding, extrusion or thermal forming. Most automobile parts are processed by injection molding, and ABS resin has advantages of impact resistance, sound insulation, scratch resistance, heat resistance, and more aesthetic appearance than PP, particularly in parts where impact resistance in the transverse direction and use temperature are severe. ABS resin is the third largest resin used in automobiles next to polyurethane and polypropylene. The ABS resin can be used for shells in and out of a vehicle, small parts such as a steering wheel, an oil guide pipe, a handle and a button, and the outside of the vehicle comprises a front radiator grille, a lampshade and the like.
ABS resin is easy to process, the processing dimensional stability and the surface gloss are good, easy coating and coloring, secondary processing performances such as metal spraying, electroplating, welding, bonding and the like can be carried out, and the ABS resin can be widely applied to the field of electronic appliances including various office and consumer electronics/appliances, and office appliances including electronic data processors and office equipment. In the electronic and electric appliance market, ABS resin keeps its position in the electronic/electric appliance market which requires flame retardance and high heat resistance, and the flame-retardant and high-heat-resistant ABS resin has obvious advantages in competition with engineering plastic alloys such as ABS/PC and the like. It is a thermoplastic engineering plastic with wide application in the mechanical, automobile, building material, electronic and electric industries.
One important drawback of ABS is poor weatherability, the fundamental reason for which is that butadiene in the component makes the polymer molecule contain a double bond structure and is easily oxidized, so that ABS has a drawback in weatherability. ASA resin is a terpolymer of acrylonitrile, styrene and acrylate, and is a substitute material of ABS resin. Compared with ABS, because the acrylate rubber without double bonds is introduced to replace butadiene rubber, the weather resistance is essentially improved and is about 10 times higher than that of ABS, and other mechanical properties, processing performance, electrical insulation and chemical resistance are similar to those of ABS. In addition, ASA has good colorability and excellent weatherability of the resin itself, and can be dyed in various vivid colors without fading easily. The product processed by the ASA resin can be directly used outdoors without surface protection such as paint spraying, coating, electroplating and the like, and is exposed for 9-15 months in the sunlight, so that the impact strength and the elongation are hardly reduced, and the color is hardly changed.
Chinese patent application No. 201510192462.2 discloses a weather-resistant ASA material for vehicles and a preparation method and application thereof, wherein ASA/AS/ABS is subjected to ternary blending modification according to a specific proportion, and a proper amount of toughening agent, antioxidant, ultraviolet absorbent, light stabilizer and dispersing agent are added to prepare the weather-resistant ASA material for vehicles by a screw extruder, but the ASA material is expensive AS a main material and has better toughness than ABS.
Chinese patent application No. 201120016079.9 discloses an ABS composite board, wherein an ASA material layer is compounded on an ABS resin layer in a precise mould, so that a composite material which has good weather resistance, strong impact resistance and good toughness and is suitable for outdoor application is obtained. However, the ABS surface of the composite board still cannot avoid contacting with natural environments such as ultraviolet rays, so the use condition and the service life of the composite board with the structure are limited to a certain extent.
In summary, although the weatherability of ABS can be improved by compounding ASA resin material with ABS resin material, the technical solutions disclosed in the prior art still cannot meet the comprehensive requirement of further improving the weatherability of ABS resin at low cost.
Disclosure of Invention
Aiming at the technical defects of high cost and poor weather resistance of ABS composite materials in the prior art, the invention provides the high weather resistance ABS microporous foam foamed by sandwich injection and the preparation method thereof.
In order to solve the problems, the invention adopts the following technical scheme:
on the one hand, the high-weather-resistance ABS microporous foam is prepared by using the following raw materials:
69-71 parts of ABS resin
14-16 parts of ASA resin
8-10 parts of compatilizer
2-10 parts of antioxidant
3-5 parts of expanded microspheres
0 to 3 portions of toner
The ABS resin is an acrylonitrile-butadiene-styrene terpolymer, the butadiene content is 30 ~ 50%, the acrylonitrile content is 20 ~ 30%, the ASA resin is an acrylonitrile-styrene-acrylate copolymer, the rubber phase acrylate content of the ASA resin is 30 ~ 70%, the compatilizer is one of a cyclic anhydride type, an epoxy type, a carboxylic acid type and an isocyanate type, the antioxidant is at least one of antioxidant 1010 and antioxidant 168, the expanded microspheres are acrylonitrile copolymers filled with hydrocarbons inside, the foaming temperature is 220-240 ℃, and the toner is at least one of red toner, yellow toner, blue toner, green toner, white toner and black toner.
Preferably, the ABS microporous foam has a sandwich structure with ASA resin as a coating skin layer and ABS resin as a core layer.
On the other hand, the preparation method of the sandwich injection foaming high-weatherability ABS microporous foam is that a bi-component injection molding machine with two sets of injection molding devices is adopted to respectively perform injection molding on an injection molding cavity with a movable column, and the preparation method comprises the following steps:
(1) pressurizing a movable column in an injection molding cavity, filling the movable column into the injection molding cavity, wherein the injection molding cavity is in a filling state, injecting 14-16 parts of molten ASA resin from a sprue of the injection molding cavity, and filling the molten ASA resin into a gap between the movable column and the inner side cavity wall of the injection molding cavity to be used as a coating skin layer;
(2) after the ASA resin is solidified, moving the movable column out of the injection molding cavity, keeping the injection molding cavity in a vacant state, injecting a heating melt containing 3-5 parts of expanded microspheres, 8-10 parts of compatilizer, 2-10 parts of antioxidant and 69-71 parts of ABS through the same gate, and heating the melt to reach the foaming temperature of the expanded microspheres by a heating device after the injection molding cavity is filled with the melt to obtain core ABS resin foam resin;
(3) injecting ASA resin melt to seal the mold, and obtaining a sandwich structure composite material with ASA resin as a coating skin layer and ABS resin as a core layer;
the movable column is a cylinder, the axis of the cylinder is the same as that of the injection molding cavity, the radius of the movable column is smaller than that of the injection molding cavity, and the movable column can do piston motion along the melt flowing direction relative to the injection molding cavity.
Preferably, before the injecting 14-16 parts of molten ASA resin from the gate of the cavity, the method further comprises performing color matching treatment on the ASA resin by using 0-3 parts of toner.
Preferably, the width of a gap between the movable column and the wall of the injection molding cavity is 0.3-10mm, and the length of the movable column body is greater than or equal to that of the injection molding cavity.
Preferably, the cross-sectional shape of the movable column is one of circular, oval and polygonal.
Preferably, the curing temperature of the ASA resin is 80-85 ℃, and the curing time is 1-4 h.
Preferably, the heating device heats to 240 ℃ and 220 ℃, and the expanded microspheres are foamed.
Compared with the prior art, the invention has the outstanding characteristics and excellent effects that:
1. the invention provides a sandwich injection foaming high-weatherability ABS microporous foam and a preparation method thereof.A double-component injection molding machine with two sets of injection molding devices is used, ASA is injected from one set of injection molding device to serve as a coating skin layer, ABS resin mixed with expanded microspheres and other additives is injected through the same sprue, and finally ASA melt is injected to seal a mold, so that the ASA microporous foam with the surface layer coated with ASA is obtained. The method provided by the invention adopts a special injection molding process, overcomes the technical defects of poor weather resistance of ABS and high cost of ABS composite material in the prior art, greatly makes up for the defect of poor weather resistance of ABS by adopting a small amount of ASA resin with strong weather resistance, and reduces the production cost of ABS composite material.
2. The high-weatherability ABS microporous foam prepared by the scheme disclosed by the invention has excellent mechanical properties, a used mold has a simple structure, an injection molding preparation process is simple, and large-scale industrial production is easy to realize.
3. According to the scheme disclosed by the invention, the foam product with rich appearance and color is prepared by matching ASA with toner, so that the market demand can be met.
Drawings
FIG. 1 is a structural diagram of an ASA resin injection mold with an injection mold cavity in a filling state according to an embodiment of the application;
FIG. 2 is a schematic structural diagram of an ASA microcellular foam injection molded when an injection molding cavity is in a vacant state in the embodiment of the application.
Detailed Description
The present invention will be described in further detail with reference to specific embodiments, but it should not be construed that the scope of the present invention is limited to the following examples. Various substitutions and alterations can be made by those skilled in the art and by conventional means without departing from the spirit of the method of the invention described above.
Example 1
(1) 0.5 part of toner is adopted to carry out color matching treatment on the ASA resin with the rubber phase acrylate content of 30 percent. The toner in the embodiment is at least one selected from red toner, yellow toner, blue toner, green toner, white toner and black toner, wherein the toner raw material is selected from the following types of red toner: at least one of cadmium red, cadmium vermilion, iron oxide red, permanent red, lithol scarlet, lithol purplish red and lithol red; yellow toner: at least one of chrome yellow, hansa yellow, benzidine, permanent yellow and fluorescent yellow; blue toner: at least one of ferric blue, cobalt blue and phthalocyanine blue; green toner: at least one of chromium green, phthalocyanine green G and fluorescent green GG; white toner: at least one of lithopone, zinc oxide (ZnO) and titanium dioxide; black toner: at least one of carbon black and aniline black is exemplified by red-type toner iron oxide red in this embodiment, and those skilled in the art may select one or more other combinations according to the needs, and the present application is not particularly limited.
Pressurizing a movable column 02 in an injection molding cavity 01, filling the movable column 02 into the injection molding cavity 01, wherein the injection molding cavity 01 is in a filling state, injecting 14-16 parts of molten ASA resin from a sprue 03 of the injection molding cavity 01 as shown in figure 1, and filling the molten ASA resin into a gap between the movable column 02 and the inner side cavity wall of the injection molding cavity 01 to be used as a coating skin layer; the width of the gap between the movable column 02 and the wall of the injection molding cavity 01 is 5mm, and the length of the movable column 02 is more than or equal to that of the injection molding cavity 01. The cross-sectional shape of the movable column 02 is one of circular, oval and polygonal, and in the present embodiment, the cross-section of the movable column is preferably circular.
(2) And (4) preparing an ABS melt. The ABS melt contains 3 parts of expanded microspheres, acrylonitrile copolymer of hydrocarbon is filled in the expanded microspheres, and foaming is carried out at the temperature of 240 ℃; 8 parts of a cyclic anhydride-type compatibilizer; 10 parts of an antioxidant 1010; 69 parts of an ABS resin having a butadiene content of 30% and an acrylonitrile content of 30% was heated and melted to obtain a melt.
The curing temperature of the ASA resin is 85 ℃, the curing time is 1h, after the ASA resin is cured, the movable column 02 is moved out of the injection molding cavity 01, the injection molding cavity is in a vacant state, as shown in FIG. 2, a melt is injected through a sprue 03, after the injection molding cavity 01 is filled with the melt, a heating device is heated to the temperature of 220-;
(3) and (3) injecting ASA resin melt to seal the mold, and obtaining the sandwich structure composite material with ASA resin as a red cladding skin layer and ABS resin as a core layer.
Weather resistance tests show that the data obtained by the sandwich injection foamed ABS microcellular foam with high weather resistance in the embodiment are shown in Table 1.
Example 2
(1) Melting ASA resin with the content of rubber phase acrylate of 370%, pressurizing a movable column 02 in an injection molding cavity 01, filling the movable column 02 into the injection molding cavity 01, wherein the injection molding cavity 01 is in a filling state, as shown in FIG. 1, injecting 14 parts of molten ASA resin from a sprue 03 of the injection molding cavity 01, and filling the molten ASA resin into a gap between the movable column 02 and the inner side cavity wall of the injection molding cavity 01 to serve as a coating skin layer; the width of a gap between the movable column 02 and the wall of the injection molding cavity 01 is 0.3mm, and the length of the movable column 02 is more than or equal to that of the injection molding cavity 01. The cross-sectional shape of the movable column 02 is one of circular, oval and polygonal, and in the present embodiment, the cross-section of the movable column is preferably circular.
(2) And (4) preparing an ABS melt. The ABS melt contains 5 parts of expanded microspheres, acrylonitrile copolymer of hydrocarbon is filled in the expanded microspheres, and foaming is carried out at the temperature of 220 ℃; 10 parts of an epoxy-type compatibilizer; 2 parts of an antioxidant 168; 71 parts of an ABS resin having a butadiene content of 50% and an acrylonitrile content of 20% was heated and melted to obtain a melt.
The curing temperature of the ASA resin is 80 ℃, the curing time is 4 hours, after the ASA resin is cured, the movable column 02 is moved out of the injection molding cavity 01, the injection molding cavity is in a vacant state, as shown in FIG. 2, a melt is injected through a sprue 03, after the injection molding cavity 01 is filled with the melt, a heating device is heated to 220 ℃, and the expanded microspheres are foamed to obtain core ABS resin foam resin;
(3) and (3) injecting ASA resin melt to seal the mold, and obtaining the sandwich structure composite material with ASA resin as a coating skin layer and ABS resin as a core layer.
Weather resistance tests show that the data obtained by the sandwich injection foamed ABS microcellular foam with high weather resistance in the embodiment are shown in Table 1.
Example 3
(1) ASA resin with 50 percent of rubber phase acrylate is subjected to color matching treatment by adopting 3 parts of toner. The toner in the embodiment is at least one selected from red toner, yellow toner, blue toner, green toner, white toner and black toner, wherein the toner raw material is selected from the following types of red toner: at least one of cadmium red, cadmium vermilion, iron oxide red, permanent red, lithol scarlet, lithol purplish red and lithol red; yellow toner: at least one of chrome yellow, hansa yellow, benzidine, permanent yellow and fluorescent yellow; blue toner: at least one of ferric blue, cobalt blue and phthalocyanine blue; green toner: at least one of chromium green, phthalocyanine green G and fluorescent green GG; white toner: at least one of lithopone, zinc oxide (ZnO) and titanium dioxide; black toner: at least one of carbon black and aniline black is exemplified by green toner chrome green in this embodiment, and those skilled in the art may select one or more other combinations according to needs, and those skilled in the art may select one or more combinations according to needs, and the application is not limited specifically.
Pressurizing a movable column 02 in an injection molding cavity 01, filling the movable column 02 into the injection molding cavity 01, wherein the injection molding cavity 01 is in a filling state, injecting 15 parts of molten ASA resin from a sprue 03 of the injection molding cavity 01 as shown in figure 1, and filling the molten ASA resin into a gap between the movable column 02 and the inner side cavity wall of the injection molding cavity 01 to form a coating skin layer; the width of the gap between the movable column 02 and the wall of the injection molding cavity 01 is 1mm, and the length of the movable column 02 is more than or equal to that of the injection molding cavity 01. The cross-sectional shape of the movable column 02 is one of circular, oval and polygonal, and in the present embodiment, the cross-section of the movable column is preferably oval.
(2) And (4) preparing an ABS melt. The ABS melt contains 4 parts of expanded microspheres, acrylonitrile copolymer of hydrocarbon is filled in the expanded microspheres, and foaming is carried out at the temperature of 230 ℃; 9 parts of an isocyanate-type compatibilizer; 4 parts of an antioxidant 1010; 69 parts of an ABS resin having a butadiene content of 35% and an acrylonitrile content of 23% was heated and melted to obtain a melt.
The curing temperature of the ASA resin is 83 ℃, the curing time is 3.5 hours, after the ASA resin is cured, the movable column 02 is moved out of an injection molding cavity 01, the injection molding cavity is in a vacant state, as shown in FIG. 2, a melt is injected through a sprue 03, after the injection molding cavity 01 is filled with the melt, a heating device is heated to 225 ℃, and the expanded microspheres are foamed to obtain the core ABS resin foam resin;
(3) and (3) injecting ASA resin melt to seal the mold, and obtaining the sandwich structure composite material with ASA resin as a green coating skin layer and ABS resin as a core layer.
Weather resistance tests show that the data obtained by the sandwich injection foamed ABS microcellular foam with high weather resistance in the embodiment are shown in Table 1.
Example 4
(1) 1 part of toner is adopted to carry out color matching treatment on ASA resin with the rubber phase acrylate content of 60%. The toner in the embodiment is at least one selected from red toner, yellow toner, blue toner, green toner, white toner and black toner, wherein the toner raw material is selected from the following types of red toner: at least one of cadmium red, cadmium vermilion, iron oxide red, permanent red, lithol scarlet, lithol purplish red and lithol red; yellow toner: at least one of chrome yellow, hansa yellow, benzidine, permanent yellow and fluorescent yellow; blue toner: at least one of ferric blue, cobalt blue and phthalocyanine blue; green toner: at least one of chromium green, phthalocyanine green G and fluorescent green GG; white toner: at least one of lithopone, zinc oxide (ZnO) and titanium dioxide; black toner: in this embodiment, at least one of the carbon black and the aniline black is exemplified by white toner lithopone, and those skilled in the art may select one or more other combinations as needed, and those skilled in the art may select one or more combinations as needed, which is not particularly limited in this application.
Pressurizing a movable column 02 in an injection molding cavity 01, filling the movable column 02 into the injection molding cavity 01, wherein the injection molding cavity 01 is in a filling state, injecting 16 parts of molten ASA resin from a sprue 03 of the injection molding cavity 01 as shown in FIG. 1, and filling the molten ASA resin into a gap between the movable column 02 and the inner side cavity wall of the injection molding cavity 01 to form a coating skin layer; the width of the gap between the movable column 02 and the wall of the injection molding cavity 01 is 5mm, and the length of the movable column 02 is more than or equal to that of the injection molding cavity 01. The cross-sectional shape of the movable column 02 is one of circular, oval and polygonal, and in the embodiment, the cross-section of the movable column is preferably square.
(2) And (4) preparing an ABS melt. The ABS melt contains 5 parts of expanded microspheres, acrylonitrile copolymer of hydrocarbon is filled in the expanded microspheres, and foaming is carried out at 235 ℃; 8.5 parts of a carboxylic acid type compatibilizing agent; and 8 parts of antioxidant 168; 71 parts of an ABS resin having a butadiene content of 35% and an acrylonitrile content of 28% was heated and melted to obtain a melt.
The curing temperature of the ASA resin is 83 ℃, the curing time is 2 hours, after the ASA resin is cured, the movable column 02 is moved out of the injection molding cavity 01, the injection molding cavity is in a vacant state, as shown in FIG. 2, a melt is injected through a sprue 03, after the injection molding cavity 01 is filled with the melt, a heating device is heated to 240 ℃, and the expanded microspheres are foamed to obtain core ABS resin foam resin;
(3) and injecting ASA resin melt to seal the mold to obtain the sandwich structure composite material with the ASA resin as a white coating skin layer and the ABS resin as a core layer.
Weather resistance tests show that the data obtained by the sandwich injection foamed ABS microcellular foam with high weather resistance in the embodiment are shown in Table 1.
Example 5
(1) ASA resin with 55 percent of rubber phase acrylate is subjected to color matching treatment by adopting 3 parts of toner. The toner in the embodiment is at least one selected from red toner, yellow toner, blue toner, green toner, white toner and black toner, wherein the toner raw material is selected from the following types of red toner: at least one of cadmium red, cadmium vermilion, iron oxide red, permanent red, lithol scarlet, lithol purplish red and lithol red; yellow toner: at least one of chrome yellow, hansa yellow, benzidine, permanent yellow and fluorescent yellow; blue toner: at least one of ferric blue, cobalt blue and phthalocyanine blue; green toner: at least one of chromium green, phthalocyanine green G and fluorescent green GG; white toner: at least one of lithopone, zinc oxide (ZnO) and titanium dioxide; black toner: in this embodiment, at least one of the carbon black and the aniline black is exemplified by white toner lithopone and black toner aniline black, and those skilled in the art may select one or more other combinations according to the needs, and those skilled in the art may select one or more combinations according to the needs, and the application is not limited specifically.
Pressurizing a movable column 02 in an injection molding cavity 01, filling the movable column 02 into the injection molding cavity 01, wherein the injection molding cavity 01 is in a filling state, injecting 15 parts of molten ASA resin from a sprue 03 of the injection molding cavity 01 as shown in figure 1, and filling the molten ASA resin into a gap between the movable column 02 and the inner side cavity wall of the injection molding cavity 01 to form a coating skin layer; the width of a gap between the movable column 02 and the wall of the injection molding cavity 01 is 6.5mm, and the length of the movable column 02 is more than or equal to that of the injection molding cavity 01. The cross-sectional shape of the movable column 02 is one of circular, oval and polygonal, and in the present embodiment, the cross-section of the movable column is preferably circular.
(2) And (4) preparing an ABS melt. The ABS melt contains 3-5 parts of expanded microspheres, acrylonitrile copolymer of hydrocarbon is filled in the expanded microspheres, and foaming is carried out at the temperature of 225 ℃; 10 epoxy type compatibilizing agent; 9 parts of an antioxidant 168; 69 parts of an ABS resin having a butadiene content of 35% and an acrylonitrile content of 22% was heated and melted to obtain a melt.
The curing temperature of the ASA resin is 83 ℃, the curing time is 2.5 hours, after the ASA resin is cured, the movable column 02 is moved out of the injection molding cavity 01, the injection molding cavity is in a vacant state, as shown in FIG. 2, a melt is injected through a gate 03, after the injection molding cavity 01 is filled with the melt, a heating device is heated to 240 ℃, and the expanded microspheres are foamed to obtain the core ABS resin foam resin;
(3) and injecting ASA resin melt to seal the mold to obtain the sandwich structure composite material with ASA resin as a gray cladding skin layer and ABS resin as a core layer.
Weather resistance tests show that the data obtained by the sandwich injection foamed ABS microcellular foam with high weather resistance in the embodiment are shown in Table 1.
Watch 1
| Testing performance | Example 1 | Example 2 | Example 3 | Example 4 | Example 5 |
| Density g/cm3 | 0.621 | 0.712 | 0.739 | 0.698 | 0.769 |
| Bending strength MPa | 87 | 83 | 92 | 90 | 89 |
| Tensile strength MPa | 58 | 54 | 51 | 61 | 59 |
| Shrinkage ratio% | 0.3 | 0.4 | 0.5 | 0.3 | 0.4 |
| Thermal aging resistance time h | 9800 | 10200 | 11030 | 9950 | 10080 |
Claims (6)
1. A preparation method of sandwich injection foaming high-weatherability ABS microporous foam is characterized in that a two-component injection molding machine with two sets of injection molding devices is adopted to respectively perform injection molding on an injection molding cavity with a movable column, and the preparation method comprises the following steps:
(1) pressurizing a movable column in an injection molding cavity, filling the movable column into the injection molding cavity, wherein the injection molding cavity is in a filling state, injecting 14-16 parts of molten ASA resin from a sprue of the injection molding cavity, and filling the molten ASA resin into a gap between the movable column and the inner side cavity wall of the injection molding cavity to be used as a coating skin layer;
(2) after the ASA resin is solidified, moving the movable column out of the injection molding cavity, keeping the injection molding cavity in a vacant state, injecting a heating melt containing 3-5 parts of expanded microspheres, 8-10 parts of compatilizer, 2-10 parts of antioxidant and 69-71 parts of ABS through the same gate, and heating the melt to reach the foaming temperature of the expanded microspheres by a heating device after the injection molding cavity is filled with the melt to obtain core ABS resin foam resin;
(3) injecting ASA resin melt to seal the mold, and obtaining a sandwich structure composite material with ASA resin as a coating skin layer and ABS resin as a core layer; the movable column is a cylinder, the axis of the cylinder is the same as that of the injection molding cavity, the radius of the movable column is smaller than that of the injection molding cavity, and the movable column can perform piston movement relative to the injection molding cavity along the melt flow direction;
wherein the ABS resin is an acrylonitrile-butadiene-styrene terpolymer, the butadiene content is 30-50%, and the acrylonitrile content is 20-30%; the ASA resin is an acrylonitrile-styrene-acrylate copolymer, and the content of rubber phase acrylate is 30-70%; the compatilizer is one of cyclic anhydride type, epoxy type, carboxylic acid type and isocyanate type; the antioxidant is at least one of an antioxidant 1010 and an antioxidant 168; the expanded microsphere is acrylonitrile copolymer filled with hydrocarbon inside, and the foaming temperature is 220 ℃ to 240 ℃.
2. The method for preparing the sandwich injection-foamed high-weatherability ABS microcellular foam according to claim 1, wherein before injecting 14-16 parts of molten ASA resin from the gate of the injection mold cavity, the method further comprises performing color matching treatment on the ASA resin by using 0-3 parts of toner; the toner is at least one of a red toner, a yellow toner, a blue toner, a green toner, a white toner, and a black toner.
3. The method for preparing the sandwich injection-foamed high-weatherability ABS microcellular foam according to claim 1, wherein the width of the gap between the movable column and the wall of the injection mold cavity is 0.3-10mm, and the length of the movable column is greater than or equal to the length of the injection mold cavity.
4. The method for preparing the sandwich injection foamed high-weatherability ABS cellular foam according to claim 1, characterized in that the cross-sectional shape of the movable column is one of circular, oval and polygonal.
5. The method for preparing the sandwich injection-foamed high-weatherability ABS microcellular foam according to claim 1, wherein the curing temperature of the ASA resin is 80-85 ℃ and the curing time is 1-4 h.
6. The method for preparing the sandwich injection foamed high weather resistance ABS cellular foam according to claim 1, wherein the heating device heats up to 240 ℃ and the expanded microspheres are foamed.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH06287337A (en) * | 1993-04-05 | 1994-10-11 | Sekisui Chem Co Ltd | Abs resin foam |
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| CN103602028B (en) * | 2013-10-24 | 2016-08-17 | 合肥会通新材料有限公司 | A kind of injection grade foaming ABS material and preparation method thereof |
| CN106494042A (en) * | 2016-11-15 | 2017-03-15 | 苏州亨达尔工业材料有限公司 | A kind of ABS composite boards |
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