CN112778650A - Easily-sprayed composition suitable for thin-wall injection molding and preparation method thereof - Google Patents
Easily-sprayed composition suitable for thin-wall injection molding and preparation method thereof Download PDFInfo
- Publication number
- CN112778650A CN112778650A CN202011530127.6A CN202011530127A CN112778650A CN 112778650 A CN112778650 A CN 112778650A CN 202011530127 A CN202011530127 A CN 202011530127A CN 112778650 A CN112778650 A CN 112778650A
- Authority
- CN
- China
- Prior art keywords
- thin
- injection molding
- parts
- ethylene
- wall injection
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/08—Stabilised against heat, light or radiation or oxydation
-
- 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
-
- 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
- C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend
Abstract
The invention provides an easy-spraying composition suitable for thin-wall injection molding, which comprises the following components in parts by mass: 50-83 parts of polypropylene, 10-20 parts of a toughening agent, 2-10 parts of an ethylene-polar internal olefin copolymer, 5-20 parts of a mineral filler, 0.1-0.3 part of a high molecular weight stabilizer, 0.1-0.3 part of a coupling agent and 0.5-1.5 parts of other functional auxiliaries. The composition has excellent molding surface, excellent mechanical property and dimensional stability, can meet the requirements of high-temperature and low-temperature alternation and steam jet spraying performance, has simple process and is suitable for industrial production.
Description
Technical Field
The invention belongs to the technical field of polypropylene composite materials, and particularly relates to an easily-sprayed polypropylene composition suitable for thin-wall injection molding and a preparation method thereof.
Background
Under the dual driving of environmental protection and energy saving, the thin-walled and high-performance technology of automobile parts is developed rapidly, which not only helps to improve the control performance, reduce the weight of the whole automobile and reduce the oil consumption, but also helps to shorten the molding cycle and reduce the production cost. At present, the mainstream wall thickness of a bumper of an European and American series vehicle is developed from 3 mm-3.5 mm to 2.5 mm-3 mm, the thinning aspect of a Japanese series vehicle is started earlier, the mainstream wall thickness of the bumper is developed from 2.5 mm-3 mm to less than 2mm, and the mainstream wall thickness of a domestic autonomous brand bumper is developed from 3 mm-4 mm to 2 mm-2.5 mm. The reduction of the thickness of the bumper wall puts higher requirements on various properties of materials, and high fluidity, high modulus, high toughness, low shrinkage and good dimensional stability are required so as to solve the problems of appearance, performance, dimension and molding caused by the reduction of the thickness of the bumper wall; meanwhile, the automobile bumper material has good sprayability, and particularly, in recent years, more and more automobile host factories at home and abroad put forward more and more strict requirements on the coating, such as water resistance, high and low temperature alternation resistance, steam jet resistance and the like of the coating, and the water-based environment-friendly paint is more and more widely applied, so that the higher requirement is put forward by the industry on the sprayability of the bumper body material.
The polypropylene material has become the mainstream material of the automobile bumper due to rich raw material sources, low density, easy forming and processing, outstanding mechanical properties and chemical resistance. However, the conventional polypropylene material for the bumper has lower mechanical property, is a non-polar material, has lower surface energy and lower bonding strength with paint, and cannot meet the requirements of service performance and surface spraying of the thin-wall automobile bumper.
Chinese patent CN 108530754A discloses a polypropylene plastic for thin-wall injection molding parts of automobile bumpers and a preparation method thereof, which mainly comprises the steps of uniformly mixing polypropylene matrix resin and ethylene-acrylic acid copolymer, adding the mixture of polypropylene grafted maleic anhydride containing graphene nanosheets and ethylene-octene copolymer into an extruder, adding the mixture of high-density polyethylene and coated talc powder master batches into a first side feeding port, and extruding and granulating the mixture to obtain the thin-wall injection molding polypropylene plastic suitable for automobile bumpers. But the spraying performance of the material is general, the spraying requirement of the middle and high-end automobile thin-wall bumper material cannot be met, the process is complex, the requirement on equipment is high, and the cost is high.
Chinese patent CN 107603025 discloses a polypropylene composite material for thin-wall injection molding and a preparation method thereof, and CN 105670126B discloses a high-strength lightweight polypropylene composition for thin-wall injection molding, which is suitable for thin-wall injection molding parts and has no tiger skin lines, sink marks and good surface quality, but the polypropylene composition is not designed according to the use characteristic requirements of automobile bumpers, especially the spraying performance requirements, and cannot meet the application requirements of medium-high end thin-wall automobile bumpers.
Patents CN105440438B, CN106752633A, CN107641256A, and CN109988364A disclose modification schemes for providing polarity for the problem that polypropylene is a nonpolar material and the spraying performance is poor, but on one hand, the influence of system components of the material on the coating under different environments is not considered, and the requirements of water resistance, temperature alternation resistance, and steam jet resistance are difficult to satisfy, on the other hand, the fluidity and modulus of the material are low, the addition ratio of mineral powder and elastomer is relatively high, a series of problems such as tiger skin lines, insufficient filling, softness, large size deviation and the like are easily caused during injection molding of thin-walled parts, and part of the patent process is complex and is not beneficial to industrial production. The field needs to develop an easy-spraying polypropylene composition for thin-wall injection molding, which is suitable for thin-wall injection molding, can meet the requirements of high-low temperature alternation and steam spraying performance, has simple process and is suitable for industrial production, and a preparation method thereof.
Disclosure of Invention
The invention aims to solve the technical problems, overcome the defects and defects in the background technology, provide a polypropylene composition which is suitable for thin-wall injection molding, has excellent molding surface, excellent mechanical property and dimensional stability, can meet the requirements of high-low temperature alternation and steam jet spraying performance, has simple process and is suitable for industrial production, and further provide a preparation method of the easily-sprayed polypropylene composition suitable for thin-wall injection molding.
In order to solve the technical problems, the technical scheme provided by the invention is as follows: an easy-spraying composition suitable for thin-wall injection molding comprises the following components in parts by mass: 50-83 parts of polypropylene, 10-20 parts of a toughening agent, 2-10 parts of an ethylene-polar internal olefin copolymer, 5-20 parts of a mineral filler, 0.1-0.3 part of a high molecular weight stabilizer, 0.1-0.3 part of a coupling agent and 0.5-1.5 parts of other functional auxiliaries.
In the above easily sprayable composition for thin wall injection molding, preferably, the toughening agent is a mixture of an ethylene-octene copolymer and linear low density polyethylene.
In the above easily sprayable composition for thin wall injection molding, the preferred mass ratio of the ethylene-octene copolymer to the linear low density polyethylene is 10: 1-10: 3.
more preferably, the ethylene-octene copolymer has a density of > 0.86g/cm3, a Tg of-60 ℃ and a melt mass flow rate of < 1g/10min at a temperature of 190 ℃ under a load of 2.16kg and a melting temperature of > 110 ℃.
The ethylene-octene copolymer is a novel ethylene-octene copolymer.
Further preferably, in the above easily sprayable composition for thin wall injection molding, the novel ethylene-octene copolymer is product No. 5 of dow chemical Engage XLT 8677.
Research shows that the polypropylene material system directly added with the traditional single ethylene-octene copolymer has poor performance stability, generally has the problem of tiger stripes due to compatibility with a base material, and produces serious paint shedding after temperature alternation (-40-105 ℃) and steam jet test of a sprayed product. Based on the above, the novel ethylene-octene copolymer is preferably compounded with the linear low-density polyethylene as an improved scheme, the novel ethylene-octene copolymer has a finely designed molecular structure, has better compatibility with a polypropylene substrate, has lower glass transition temperature under similar crystallinity, can better improve interface compatibility by compounding the low-density polyethylene, and obtains excellent high and low temperature impact performance.
In the above easily-sprayed composition for thin-wall injection molding, preferably, the ethylene-polar internal olefin copolymer is a copolymerization product prepared by copolymerization of an ethylene monomer and a 1, 2-disubstituted polar internal olefin monomer under the action of a palladium phosphine sulfonate catalyst PO-Pd.
Furthermore, the 1, 2-disubstituted polar internal olefin monomer is selected from one or more of biomass materials of methyl crotonate, methyl cinnamate, dimethyl maleate and dibutyl maleate.
The polar copolymer used in the invention is a linear polymer, the polar functional group is positioned on the main chain of the polymer, and the polar copolymer has a higher melting point and a narrower molecular weight distribution, and because two adjacent carbon atoms in certain regions of the polymer chain are connected with a polar substituent, compared with the existing polar copolymer, the composition prepared by adopting the characteristic copolymer has better thermal stability and paint film adhesion performance. Meanwhile, the polar copolymer is derived from biomass materials and has wide sources and price advantages.
In the above easily sprayable composition for thin wall injection molding, preferably, the polypropylene is a high flow and high crystalline co-polypropylene.
More preferably, the high-flow high-crystalline copolymerized polypropylene has a melt flow rate of 100g/10min or more at 230 ℃ under a load of 2.16 kg.
Further preferably, the high fluidity high crystalline polypropylene copolymer is selected from one or more of commercial designations BX3950, BX3920 (SK in korea), EA5076 (linadebo), BI995, BI998 (dada in hanhuadao), PPB-M100-GH (petrochemical), 7905E1 (exxonmobil chemical).
In the above easily-spraying composition for thin-wall injection molding, preferably, the high molecular weight stabilizer is one or more of amide-group-containing hindered amine, multi-piperidine dendritic hindered amine, terminal alkenyl hindered amine, hindered amine with a double hindered phenol structure, and piperidine N-alkoxy-substituted hindered amine, and the relative molecular weight of the stabilizer is 2000-3000.
The high molecular weight stabilizer has high content of effective components, can endow the polypropylene composition with excellent light and heat aging performance and processing performance after being added by 0.1-0.3 percent, has good compatibility with matrix resin and high stability in the processing process, thereby effectively avoiding the addition of a large amount of conventional processing aids such as a lubricant, a dispersant, a main antioxidant, an auxiliary antioxidant, a light stabilizer, an ultraviolet absorber and the like, avoiding the problems of degradation, migration and precipitation caused by the addition of a large amount of low molecular weight additives, and further reducing the influence on paint film adhesion caused by the degradation, migration and precipitation of system components after a high and low temperature alternation test.
In the easily-sprayed composition for thin-wall injection molding, preferably, the mineral filler is one or more of nano montmorillonite, high-silicon-content talcum powder, silicon dioxide, attapulgite and wollastonite.
In the above easily-sprayed composition for thin-wall injection molding, preferably, the coupling agent is one or more of an aminosilane coupling agent, a titanate coupling agent and an aluminum titanate coupling agent.
In the easily-sprayed composition for thin-wall injection molding, preferably, the other functional additives are a plurality of lubricating dispersant, tiger skin stripe remover and carbon black master batch.
More preferably, the lubricant dispersant is a specially optimized mixed wax-like compound which can achieve very good dispersion, mechanical and mold release properties without precipitation even when used in mineral filler materials without surface treatment.
In the above easily-sprayable composition for thin-wall injection molding, preferably, the tiger stripe remover is an epoxy aliphatic copolymer.
As a general inventive concept, another aspect of the present invention provides a method for preparing the above easily sprayable composition suitable for thin-wall injection molding, comprising the steps of:
s1, weighing the polypropylene, the toughening agent, the ethylene-polar internal olefin copolymer, the mineral filler, the high molecular weight stabilizer, the coupling agent and other functional auxiliaries according to the parts by mass.
S2, mixing polypropylene, a toughening agent, an ethylene-polar internal olefin copolymer and a coupling agent, adding a high molecular weight stabilizer and other functional auxiliaries, and adding the mixture into a main feed of a double-screw extruder; and (3) adding a mineral filler into the side feed of the double-screw extruder, and blending, extruding and granulating to obtain the easily-sprayed composition particles suitable for thin-wall injection molding.
In the preparation method, preferably, the mixing speed of the material in the step S2 is 200-400rpm/min, and the total mixing time is 1-3 min; the extrusion temperature is controlled to be 180-200 ℃, the conveying section is controlled to be 190-210 ℃, the melting section is controlled to be 200-220 ℃, and the head temperature is 210-220 ℃; the vacuum degree of the machine table is controlled to be less than or equal to-0.06 MPa, and the rotating speed of the screw is 200-400 rpm/min. Our research shows that the change of components in the system and the residue of low molecular weight substances can be effectively reduced by controlling the temperature and the vacuum degree of a feeding section, a conveying section, a melting section, a machine head of an extruder, so that the influence on a paint film after a temperature alternation test is reduced.
Compared with the prior art, the invention has the following beneficial effects:
the invention provides an easy-spraying composition suitable for thin-wall injection molding and a preparation method thereof aiming at the characteristics of reduced wall thickness, improved performance and paint film performance of a new-generation bumper product, and the like. Meanwhile, the high-fluidity high-crystallization copolymerized polypropylene resin, the functional filler and the tiger skin line remover are adopted, the dispersing lubricant with good effect is not precipitated, the fluidity and the rigidity of the material are improved, the elastomer is refined, the interface compatibility of all components among systems is better, and the molding problems of tiger skin lines, flow marks, warping and the like of large-scale thin-wall injection molding products can be effectively solved by combining process control. The polypropylene composition prepared by the invention has high fluidity, high modulus, excellent high and low temperature toughness and dimensional stability, can greatly improve the paint adhesion property of a workpiece in the temperature alternation and steam injection test processes, has good molding surface quality and simple production process, and can be widely applied to thin-wall spraying injection molding parts such as automobile bumpers and the like.
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that several modifications can be made by one of ordinary skill in the art without departing from the inventive concept. All falling within the scope of the present invention. For process parameters not specifically noted, reference may be made to conventional techniques.
The various raw materials, reagents, instruments, equipment and the like used in the present invention can be commercially available or can be prepared by existing methods, and specific information on some raw materials is as follows:
the high-fluidity high-crystalline polypropylene copolymer is selected from one or more of commercial designations BX3950, BX3920 (Korea SK), EA5076 (Lianddehiscent), BI995, BI998 (Korea Doudoudar), PPB-M100-GH (Yangzhilization), 7905E1 (Exxon Mobil chemical industry);
the high molecular weight stabilizer is preferably selected from hindered amine with amide group and hindered amine containing double hindered phenol structure, and is purchased from cyanide specialty chemical industry and Beijing Tiangang auxiliary agent company Limited respectively;
a novel ethylene-octene copolymer, Engage XLT 8677, dow chemical usa;
linear low density polyethylene, DFDA-7042, Dushan petrochemical;
lubricant dispersant, TR451, sruktol;
titanate coupling agent, AC201, tokyo-o-chi chemical ltd;
carbon black masterbatch, UN2005, cabot.
Example 1
(1) Weighing the following composition components in parts by mass: 70 parts of high-fluidity high-crystalline polypropylene, 13 parts of novel ethylene-octene copolymer, 2 parts of linear low-density polyethylene, 4 parts of ethylene-methyl crotonate copolymer, 9 parts of high-silicon-content talcum powder, 1 part of attapulgite, 0.3 part of high-molecular-weight amido hindered amine stabilizer, 0.2 part of coupling agent, 0.1 part of dispersing lubricant, 0.3 part of tiger skin stripe remover and 1 part of carbon black master batch;
(2) mixing polypropylene, a toughening agent, an ethylene-polar internal olefin copolymer and a coupling agent in a high-speed mixing pot for 1min, adding a high molecular weight stabilizer and other functional auxiliaries, mixing for 1min at the mixing speed of 300rpm/min, and adding the mixture into a main feed of a double-screw extruder; the mineral filler is mixed and counted into the side feed of the double-screw extruder, and is plasticized and melted by the double-screw extruder, and then is extruded, cooled, granulated and uniformly mixed, wherein the extrusion temperature feeding section is controlled to be 200-; the vacuum degree of the machine table is controlled to be less than or equal to-0.06 MPa, and the rotating speed of the screw is 200-400 rpm/min.
Example 2
(1) Weighing the following composition components in parts by mass: 63 parts of high-fluidity high-crystalline polypropylene, 14 parts of novel ethylene-octene copolymer, 2 parts of linear low-density polyethylene, 4 parts of ethylene-dimethyl maleate copolymer, 15 parts of high-silicon-content talcum powder, 0.3 part of high-molecular-weight hindered amine stabilizer containing double hindered phenol structure, 0.2 part of coupling agent, 0.1 part of dispersing lubricant, 0.3 part of tiger skin stripe remover and 1 part of carbon black master batch;
(2) mixing polypropylene, a toughening agent, an ethylene-polar internal olefin copolymer and a coupling agent in a high-speed mixing pot for 1min, adding a high molecular weight stabilizer and other functional auxiliaries, mixing for 1min at the mixing speed of 300rpm/min, and adding the mixture into a main feed of a double-screw extruder; the mineral filler is added into the side feed of the double-screw extruder, plasticized and melted by the double-screw extruder, and then extruded, cooled, granulated and uniformly mixed, wherein the extrusion temperature feeding section is controlled to be 200-; the vacuum degree of the machine table is controlled to be less than or equal to-0.06 MPa, and the rotating speed of the screw is 200-400 rpm/min.
Example 3
(1) Weighing the following composition components in parts by mass: 57 parts of high-fluidity high-crystalline polypropylene, 15 parts of novel ethylene-octene copolymer, 2 parts of linear low-density polyethylene, 4 parts of ethylene-dimethyl maleate copolymer, 20 parts of high-silicon-content talcum powder, 0.3 part of high-molecular-weight hindered amine stabilizer containing double hindered phenol structure, 0.2 part of coupling agent, 0.2 part of dispersing lubricant, 0.3 part of tiger skin stripe remover and 1 part of carbon black master batch;
(2) mixing polypropylene, a toughening agent, an ethylene-polar internal olefin copolymer and a coupling agent in a high-speed mixing pot for 1min, adding a high molecular weight stabilizer and other functional auxiliaries, mixing for 1min at the mixing speed of 300rpm/min, and adding the mixture into a main feed of a double-screw extruder; the mineral filler is added into the side feed of the double-screw extruder, plasticized and melted by the double-screw extruder, and then extruded, cooled, granulated and uniformly mixed, wherein the extrusion temperature feeding section is controlled to be 200-; the vacuum degree of the machine table is controlled to be less than or equal to-0.06 MPa, and the rotating speed of the screw is 200-400 rpm/min.
Example 4
(1) Weighing the following composition components in parts by mass: 55 parts of high-fluidity high-crystalline polypropylene, 15 parts of novel ethylene-octene copolymer, 2 parts of linear low-density polyethylene, 6 parts of ethylene-methyl crotonate copolymer, 1 part of nano montmorillonite, 19 parts of high-silicon-content talcum powder, 0.3 part of high-molecular-weight amido-group hindered amine stabilizer, 0.2 part of coupling agent, 0.1 part of dispersing lubricant, 0.3 part of tiger skin stripe remover and 1 part of carbon black master batch;
(2) mixing polypropylene, a toughening agent, an ethylene-polar internal olefin copolymer and a coupling agent in a high-speed mixing pot for 1min, then adding a high molecular weight stabilizer, other functional auxiliaries and nano-montmorillonite, mixing for 1min at the mixing speed of 300rpm/min, and then adding the mixture into a main feed of a double-screw extruder; the mineral filler is added into the side feed of the double-screw extruder, plasticized and melted by the double-screw extruder, and then extruded, cooled, granulated and uniformly mixed, wherein the extrusion temperature feeding section is controlled to be 200-; the vacuum degree of the machine table is controlled to be less than or equal to-0.06 MPa, and the rotating speed of the screw is 200-400 rpm/min.
Comparative example 1
(1) Weighing the following composition components in parts by mass: 57 parts of copolymerized polypropylene, 17 parts of ethylene-octene copolymer, 4 parts of PP graft, 20 parts of talcum powder, 10100.2 parts of main antioxidant, 1680.2 parts of auxiliary antioxidant, 0.5 part of calcium stearate, 0.4 part of EBS, 50.3 parts of 3808PP, 0.3 part of ultraviolet light absorber, 0.2 part of coupling agent and 1 part of carbon black master batch;
(2) mixing the materials except the talcum powder and adding the mixture into a main feed of a double-screw extruder; and adding the mineral filler into the side feed of the double-screw extruder, extruding, cooling, granulating and uniformly mixing by using the double-screw extruder, wherein the extrusion temperature is set to be 175-230 ℃, and the screw rotating speed is 200-400 rpm/min.
Comparative example 2
(1) Weighing the following composition components in parts by mass: 61 parts of copolymerized polypropylene, 17 parts of ethylene-octene copolymer, 20 parts of talcum powder, 10100.2 parts of antioxidant, 1680.2 parts of auxiliary antioxidant, 0.5 part of calcium stearate, 0.4 part of EBS, 50.3 parts of 3808PP, 0.3 part of ultraviolet light absorber, 0.2 part of coupling agent and 1 part of carbon black master batch;
(2) mixing the materials except the talcum powder and adding the mixture into a main feed of a double-screw extruder; and adding the mineral filler into the side feed of the double-screw extruder, extruding, cooling, granulating and uniformly mixing by using the double-screw extruder, wherein the extrusion temperature is set to be 175-230 ℃, and the screw rotating speed is 200-400 rpm/min.
The performance test methods of the above examples and comparative examples are as follows:
melt flow rate was tested according to ISO 1133;
tensile strength was tested according to ISO 527;
flexural properties were tested according to ISO 178;
the impact strength is tested according to ISO 180;
heat distortion temperature was tested according to ISO 75;
density was tested according to ISO 1183;
surface tension: testing according to GB/T13542.2-2009;
steam injection is tested according to PV1503, the water temperature is 70 ℃, the water pressure is 9MPa, and the water flow is 630L/h; temperature alternation + steam injection according to 3 test duration cycles, each cycle consisting of 15h/105 ℃; 30min/23 +/-2 ℃; 8h/-40 ℃; 30min/23 +/-2 ℃, performing steam injection 24 hours after the inspection is finished, evaluating the stripping condition of a painted adhesive layer, and classifying the paint adhesive layer into 0-5 grades according to the surface condition, wherein the 0-2 grades show that the spraying performance is good, and the 5 grades show that the paint is seriously stripped; other test items were taken visually.
The properties of the examples and comparative examples are detailed in the following table:
through the test results in the table above, it can be clearly seen that the polypropylene composition prepared by the embodiments of the present invention has high fluidity, high modulus, excellent high and low temperature toughness, excellent stability and easy spraying property, compared with the conventional polypropylene composition, and can meet the requirement of high spraying performance in the aspects of steam spraying, temperature alternation and steam spraying. The coating can be widely applied to automobile bumper thin-wall ornaments with high spraying performance requirements, water-based paint and primer-free requirements, and has high application value.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is specific, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent should be subject to the appended claims.
Claims (10)
1. An easy-spraying composition suitable for thin-wall injection molding is characterized in that: the composition comprises the following components in parts by mass: 50-83 parts of polypropylene, 10-20 parts of a toughening agent, 2-10 parts of an ethylene-polar internal olefin copolymer, 5-20 parts of a mineral filler, 0.1-0.3 part of a high molecular weight stabilizer, 0.1-0.3 part of a coupling agent and 0.5-1.5 parts of other functional auxiliaries.
2. The sprayable composition of claim 1 suitable for thin-wall injection molding, wherein: in the easily-sprayed composition for thin-wall injection molding, the toughening agent is a mixture of an ethylene-octene copolymer and linear low-density polyethylene.
3. The sprayable composition of claim 2 suitable for thin-wall injection molding, wherein: the mass ratio of the ethylene-octene copolymer to the linear low-density polyethylene is 10: 1-10: 3.
4. the sprayable composition of claim 2 suitable for thin-wall injection molding, wherein: the ethylene-octene copolymer has a density of more than 0.86g/cm3, a Tg of less than or equal to-60 ℃, a melt mass flow rate of less than or equal to 1g/10min at a temperature of 190 ℃ under a load of 2.16kg, and a melting temperature of more than 110 ℃.
5. The sprayable composition of claim 2 suitable for thin-wall injection molding, wherein: in the above easily-sprayed thin-wall injection molding composition, the novel ethylene-octene copolymer is a product of Dow chemical Engage XLT 8677.
6. The sprayable composition of claim 2 suitable for thin-wall injection molding, wherein: the ethylene-polar internal olefin copolymer is a copolymerization product prepared by copolymerization reaction of an ethylene monomer and a 1, 2-disubstituted polar internal olefin monomer under the action of a palladium phosphine sulfonate catalyst PO-Pd.
7. The sprayable composition of claim 6 suitable for thin-wall injection molding, wherein: the 1, 2-disubstituted polar internal olefin monomer is selected from one or more of biomass materials of methyl crotonate, methyl cinnamate, dimethyl maleate and dibutyl maleate.
8. The sprayable composition of claim 1 suitable for thin-wall injection molding, wherein: the polypropylene is high-flow high-crystallization copolymerized polypropylene, and the melt flow rate of the high-flow high-crystallization copolymerized polypropylene is more than or equal to 100g/10min at 230 ℃ under the load of 2.16 kg.
9. The sprayable composition of claim 1 suitable for thin-wall injection molding, wherein: the high molecular weight stabilizer is one or more of amido hindered amine, multi-piperidine dendritic hindered amine, terminal alkenyl hindered amine, hindered amine with double hindered phenol structure and piperidine N-alkoxy substituted hindered amine.
10. A process for the preparation of an easily sprayable composition suitable for thin-walled injection molding according to any of claims 1 to 9 comprising the steps of:
s1, weighing the polypropylene, the toughening agent, the ethylene-polar internal olefin copolymer, the mineral filler, the high molecular weight stabilizer, the coupling agent and other functional auxiliaries according to the mass parts;
s2, mixing polypropylene, a toughening agent, an ethylene-polar internal olefin copolymer and a coupling agent, adding a high molecular weight stabilizer and other functional auxiliaries, and adding the mixture into a main feed of a double-screw extruder; and (3) adding a mineral filler into the side feed of the double-screw extruder, and blending, extruding and granulating to obtain the easily-sprayed composition particles suitable for thin-wall injection molding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011530127.6A CN112778650A (en) | 2020-12-22 | 2020-12-22 | Easily-sprayed composition suitable for thin-wall injection molding and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011530127.6A CN112778650A (en) | 2020-12-22 | 2020-12-22 | Easily-sprayed composition suitable for thin-wall injection molding and preparation method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112778650A true CN112778650A (en) | 2021-05-11 |
Family
ID=75751773
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011530127.6A Pending CN112778650A (en) | 2020-12-22 | 2020-12-22 | Easily-sprayed composition suitable for thin-wall injection molding and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112778650A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114316415A (en) * | 2021-11-23 | 2022-04-12 | 金发科技股份有限公司 | Master batch for improving coating adhesive force, polypropylene material and application thereof |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106380699A (en) * | 2016-09-12 | 2017-02-08 | 株洲时代新材料科技股份有限公司 | Polypropylene composition with low VOC (Volatile Organic Compound) and low odor and preparation method of polypropylene composition |
| CN106752633A (en) * | 2015-11-19 | 2017-05-31 | 株洲时代新材料科技股份有限公司 | A kind of easy spray coating polypropylene composite and its preparation method and application |
| CN110790852A (en) * | 2019-11-12 | 2020-02-14 | 中国科学技术大学 | Process for direct catalytic polymerization of ethylene with 1, 2-disubstituted polar internal olefins and products thereof |
-
2020
- 2020-12-22 CN CN202011530127.6A patent/CN112778650A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106752633A (en) * | 2015-11-19 | 2017-05-31 | 株洲时代新材料科技股份有限公司 | A kind of easy spray coating polypropylene composite and its preparation method and application |
| CN106380699A (en) * | 2016-09-12 | 2017-02-08 | 株洲时代新材料科技股份有限公司 | Polypropylene composition with low VOC (Volatile Organic Compound) and low odor and preparation method of polypropylene composition |
| CN110790852A (en) * | 2019-11-12 | 2020-02-14 | 中国科学技术大学 | Process for direct catalytic polymerization of ethylene with 1, 2-disubstituted polar internal olefins and products thereof |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114316415A (en) * | 2021-11-23 | 2022-04-12 | 金发科技股份有限公司 | Master batch for improving coating adhesive force, polypropylene material and application thereof |
| CN114316415B (en) * | 2021-11-23 | 2023-09-12 | 金发科技股份有限公司 | Masterbatch for improving coating adhesion, polypropylene material and application thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101659766B (en) | Low-shrinkage sprayable PP/PS blend alloy and preparation method thereof | |
| CN103571039A (en) | High-melt index polypropylene composition and preparation method thereof | |
| CN113388207B (en) | High-gloss scratch-resistant easy-spraying polypropylene composite material and preparation method and application thereof | |
| CN110408120B (en) | Antistatic spraying-free polypropylene composite material with low linear thermal expansion coefficient and preparation method thereof | |
| CN112480551B (en) | Polypropylene composition and preparation method thereof | |
| CN112375324B (en) | HIPS (high impact polystyrene) composite material as well as preparation method and application thereof | |
| CN112552605B (en) | Polypropylene composite material with good dermatoglyph replication capability and preparation method thereof | |
| CN111763383B (en) | Good-touch glass fiber reinforced polypropylene composite and preparation method thereof | |
| CN113980410B (en) | Thermoplastic polyolefin material and preparation method and application thereof | |
| CN111793283B (en) | Halogen-free flame-retardant PP/ABS alloy material and preparation method and application thereof | |
| WO2023143067A1 (en) | Scratch-resistant polypropylene composite material with high impact resistance and high peeling performance, method for preparing same, and use thereof | |
| WO2024066972A1 (en) | High-primer painting rate polypropylene material, preparation method therefor, and use thereof | |
| CN112662075A (en) | Polypropylene composite material capable of eliminating appearance defects of ghost and tiger skin | |
| CN112778650A (en) | Easily-sprayed composition suitable for thin-wall injection molding and preparation method thereof | |
| CN114591587B (en) | Polystyrene composite material and preparation method thereof | |
| CN106589584B (en) | Lightweight, scratch-resistant, high luster materials and preparation method thereof and preparing the application in automobile instrument panel | |
| CN114891301A (en) | Polypropylene composition and preparation method and application thereof | |
| CN110951156B (en) | Polypropylene composite material with high surface tension and excellent comprehensive performance and preparation method thereof | |
| CN111087704A (en) | Polypropylene composition suitable for gas-assisted molding and preparation method thereof | |
| CN112679842B (en) | Polypropylene composition capable of efficiently improving flow marks and preparation method and application thereof | |
| CN112662053A (en) | Low-density high-performance modified polypropylene composite material for vehicle bumper and preparation method thereof | |
| CN116462910A (en) | Polypropylene composite material and preparation method and application thereof | |
| CN108047572B (en) | Functional talcum powder master batch | |
| CN109504023A (en) | A kind of thermoplastic elastomer (TPE) and preparation method thereof of adhesive glass | |
| CN114621522B (en) | Polypropylene composition and preparation method and application thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |