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CN113549267A - Preparation method of polypropylene engineering plastic and polypropylene engineering plastic - Google Patents

Preparation method of polypropylene engineering plastic and polypropylene engineering plastic Download PDF

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Publication number
CN113549267A
CN113549267A CN202110779902.XA CN202110779902A CN113549267A CN 113549267 A CN113549267 A CN 113549267A CN 202110779902 A CN202110779902 A CN 202110779902A CN 113549267 A CN113549267 A CN 113549267A
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polypropylene
dried
mixture
engineering plastic
agent
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张博
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Hebei Kunchi Plastic Products Co ltd
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Hebei Kunchi Plastic Products Co ltd
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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
    • C08L23/12—Polypropene
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B9/00—Making granules
    • B29B9/02—Making granules by dividing preformed material
    • B29B9/06—Making granules by dividing preformed material in the form of filamentary material, e.g. combined with extrusion
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B9/00—Making granules
    • B29B9/12—Making granules characterised by structure or composition
    • 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
    • C08L2205/24—Crystallisation aids
    • C08L2205/242—Beta spherulite nucleating agents

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Abstract

The application provides a preparation method of polypropylene engineering plastic, the polypropylene engineering plastic prepared by the method and another polypropylene engineering plastic. The preparation method of the polypropylene engineering plastic comprises the step of mixing polypropylene, ethylene-propylene copolymer, polyethylene, stress whitening resistance auxiliary agent, toughening agent, low-temperature resistance toughening agent, dispersing agent, solubilizer and antioxidant according to a preset weight proportion to prepare the polypropylene engineering plastic, so that the polypropylene engineering plastic prepared by the method has the characteristics of high external force collision resistance, high temperature resistance, high and cold resistance, chemical corrosion resistance, stress whitening resistance and the like.

Description

Preparation method of polypropylene engineering plastic and polypropylene engineering plastic
Technical Field
The application relates to polypropylene, in particular to a preparation method of polypropylene engineering plastic and the polypropylene engineering plastic.
Background
At present, light weight and environmental protection are main directions of the development of automobile material technology in the world, so that the concept of replacing steel with plastic is provided to reduce the weight of an automobile, reduce the emission of automobile exhaust and improve the combustion efficiency to achieve energy conservation and environmental protection.
The mass of the current plastic materials accounts for about 7 to 10 percent of the weight of the automobile. Because polypropylene (PP) has excellent comprehensive performance, low price and environmental protection, the PP accounts for more than 35 percent of the automobile plastic in the aspect of automobile usage. However, as the use frequency of PP in the application process increases, the phenomenon that the surface of a PP part is whitened (stress whitening for short) due to external force during the production, transportation and assembly processes is increasingly remarkable. The reason for this is that the reason for causing PP stress whitening is mainly that when the automobile material is subjected to an external force, the material generates crazing, microcrack or micropore inside, which results in the reduction of the refractive index of the material. How to prepare the stress whitening resistant material becomes a technical problem which needs to be solved urgently.
Disclosure of Invention
The application provides a preparation method of polypropylene engineering plastic, which aims to solve the problem of how to prepare a stress whitening resistant material. The application also provides two polypropylene engineering plastics.
The application provides a preparation method of polypropylene engineering plastic, which comprises the following steps:
respectively drying the polypropylene, the ethylene-propylene copolymer and the polyethylene to obtain dried polypropylene, dried ethylene-propylene copolymer and dried polyethylene;
according to a preset first weight proportion, putting a stress-resistant whitening auxiliary agent, a toughening agent, a low-temperature-resistant toughening agent, a dispersing agent, a solubilizing agent and an antioxidant into a high-speed mixer and stirring to obtain a stirred first mixture;
according to a preset second weight proportion, putting the dried polypropylene, the dried ethylene-propylene copolymer and the dried polyethylene into a high-speed mixer, and stirring to obtain a stirred second mixture;
blending the first mixture and the second mixture, and stirring the first mixture and the second mixture in a high-speed mixer to obtain a stirred third mixture;
and putting the third mixture into a double-screw extruder for full melt blending, and extruding and granulating through the double-screw extruder to obtain the polypropylene engineering plastic.
Optionally, the polypropylene, the ethylene-propylene copolymer, and the polyethylene are respectively dried to obtain dried polypropylene, dried ethylene-propylene copolymer, and dried polyethylene, and the method specifically includes:
drying the polypropylene for 3-4 hours at 70-80 ℃, and controlling the water content of the polypropylene to be below 0.02 to obtain dried polypropylene;
drying the ethylene-propylene copolymer at 70-80 ℃ for 3-4 hours, and controlling the water content of the ethylene-propylene copolymer to be below 0.03 to obtain the dried ethylene-propylene copolymer;
and (3) drying the polyethylene at 70-80 ℃ for 3-4 hours, and controlling the water content of the polyethylene to be below 0.03 to obtain the dried polyethylene.
Optionally, the mass ratio of each component of the dried polypropylene, the dried ethylene-propylene copolymer, the dried polyethylene, the stress whitening resistance auxiliary agent, the toughening agent, the low temperature resistant toughening agent, the dispersing agent, the solubilizing agent and the antioxidant in the third mixture is as follows in sequence: 30 to 65 percent, 5 to 30 percent, 5 to 20 percent, 0.5 to 2 percent, 0.5 to 3 percent and 0.4 to 1 percent.
Optionally, the stress whitening resistance auxiliary agent is a beta nucleating agent; the toughening agent is a polyethylene octene co-elastomer; the low-temperature resistant toughening agent is a copolymer of ethylene and propylene; the dispersant is at least one of stearic acid, OP wax and ethylene bisstearamide; the solubilizer is ethylene-methyl acrylate-glycidyl methacrylate terpolymer; the antioxidant is a compound of hindered phenol antioxidant and phosphite antioxidant.
Optionally, the stress whitening resistance auxiliary agent, the toughening agent, the low temperature resistant toughening agent, the dispersant, the solubilizer and the antioxidant are put into a high-speed mixer and stirred to obtain a stirred first mixture, which includes:
and (3) putting the stress whitening resistant auxiliary agent, the toughening agent, the low-temperature resistant toughening agent, the dispersing agent, the solubilizer and the antioxidant into a high-speed mixer, and stirring for 1-3 minutes to obtain a stirred first mixture.
Optionally, the step of placing the dried polypropylene, the dried ethylene-propylene copolymer, and the dried polyethylene into a high-speed mixer to be stirred to obtain a stirred second mixture, which includes:
and putting the dried polypropylene, the dried ethylene-propylene copolymer and the dried polyethylene into a high-speed mixer, and stirring for 3-5 minutes to obtain a stirred second mixture.
Optionally, the blending the first mixture and the second mixture, and placing the blended mixture into a high-speed mixer to be stirred to obtain a stirred third mixture, including:
and blending the first mixture and the second mixture, and putting the mixture into a high-speed mixer to be stirred for 3-5 minutes to obtain a stirred third mixture.
Optionally, the third mixture is placed into a twin-screw extruder to be sufficiently melted and blended, and is extruded and granulated through the twin-screw extruder to obtain the polypropylene engineering plastic, which comprises:
and putting the third mixture into a double-screw extruder with the melting temperature set to be 180-210 ℃ and the screw rotating speed set to be 300-500 r/min, fully melting and blending, and extruding and granulating through the double-screw extruder to obtain the polypropylene engineering plastic.
Correspondingly, the application provides a polypropylene engineering plastic prepared by the preparation method of the polypropylene engineering plastic.
The application provides a polypropylene engineering plastic which comprises the following components in percentage by mass:
30 to 65 percent of dried polypropylene, 5 to 30 percent of dried ethylene propylene copolymer, 5 to 30 percent of dried polyethylene, 5 to 20 percent of stress whitening resistance auxiliary agent, 5 to 20 percent of toughening agent, 5 to 20 percent of low temperature resistant toughening agent, 0.5 to 2 percent of dispersing agent, 0.5 to 3 percent of solubilizer and 0.4 to 1 percent of antioxidant.
Compared with the prior art, the method has the following advantages:
the application provides a preparation method of polypropylene engineering plastic, which comprises the following steps: respectively drying the polypropylene, the ethylene-propylene copolymer and the polyethylene to obtain dried polypropylene, dried ethylene-propylene copolymer and dried polyethylene; according to a preset first weight proportion, putting a stress-resistant whitening auxiliary agent, a toughening agent, a low-temperature-resistant toughening agent, a dispersing agent, a solubilizing agent and an antioxidant into a high-speed mixer and stirring to obtain a stirred first mixture; according to a preset second weight proportion, putting the dried polypropylene, the dried ethylene-propylene copolymer and the dried polyethylene into a high-speed mixer, and stirring to obtain a stirred second mixture; blending the first mixture and the second mixture, and stirring the first mixture and the second mixture in a high-speed mixer to obtain a stirred third mixture; and putting the third mixture into a double-screw extruder for full melt blending, and extruding and granulating through the double-screw extruder to obtain the polypropylene engineering plastic. The polypropylene engineering plastic is prepared by mixing the polypropylene, the ethylene-propylene copolymer, the polyethylene, the stress whitening resistance auxiliary agent, the toughening agent, the low-temperature resistant toughening agent, the dispersing agent, the solubilizer and the antioxidant according to the preset weight proportion, so that the prepared polypropylene engineering plastic has the characteristics of high external force collision resistance, high temperature resistance, high and cold resistance, chemical corrosion resistance, stress whitening resistance and the like.
Drawings
FIG. 1 is a flow chart of a method for preparing polypropylene engineering plastics according to an embodiment of the present application.
Detailed Description
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. This application is capable of implementation in many different ways than those herein set forth and of similar import by those skilled in the art without departing from the spirit of this application and is therefore not limited to the specific implementations disclosed below.
The application provides a preparation method of polypropylene engineering plastic, the polypropylene engineering plastic prepared by the method, and another polypropylene engineering plastic, and the following concrete examples are provided.
FIG. 1 is a flow chart of the preparation method of the polypropylene engineering plastic of the present application. The method comprises the following steps:
step S101: and respectively drying the polypropylene, the ethylene-propylene copolymer and the polyethylene to obtain dried polypropylene, dried ethylene-propylene copolymer and dried polyethylene.
In the application, polypropylene base material, polyethylene, ethylene-propylene copolymer, low temperature resistant toughening agent, stress whitening resistant auxiliary agent and other materials are blended, extruded and granulated to prepare the polypropylene engineering plastic. The preparation method of the polypropylene engineering plastic is the polypropylene engineering plastic prepared in a dry state, and can be used for drying the polypropylene, the ethylene-propylene copolymer and the polyethylene in advance so as to obtain the dried polypropylene, the dried ethylene-propylene copolymer and the dried polyethylene.
Specifically, the polypropylene, the ethylene-propylene copolymer, and the polyethylene are respectively dried to obtain dried polypropylene, dried ethylene-propylene copolymer, and dried polyethylene, and they may be: drying the polypropylene for 3-4 hours at 70-80 ℃, and controlling the water content of the polypropylene to be below 0.02 to obtain dried polypropylene; drying the ethylene-propylene copolymer at 70-80 ℃ for 3-4 hours, and controlling the water content of the ethylene-propylene copolymer to be below 0.03 to obtain the dried ethylene-propylene copolymer; and (3) drying the polyethylene at 70-80 ℃ for 3-4 hours, and controlling the water content of the polyethylene to be below 0.03 to obtain the dried polyethylene.
Step S102: according to a preset first weight proportion, placing the stress whitening resistant auxiliary agent, the toughening agent, the low temperature resistant toughening agent, the dispersing agent, the solubilizing agent and the antioxidant into a high-speed mixer for stirring to obtain a stirred first mixture.
In the application, the components such as polypropylene, ethylene-propylene copolymer, polyethylene, stress whitening resistance auxiliary agent, toughening agent, low temperature resistance toughening agent, dispersing agent, solubilizer and antioxidant are mixed according to a certain weight proportion, and in order to mix various combinations uniformly, the components are mixed in two steps.
In the application, as long as the final mixed components are ensured, the mass ratio of each component in the final mixed components of the dried polypropylene, the dried ethylene-propylene copolymer, the dried polyethylene, the stress whitening resistance auxiliary agent, the toughening agent, the low temperature resistant toughening agent, the dispersing agent, the solubilizing agent and the antioxidant is as follows in sequence: 30-65%, 5-30%, 5-20%, 0.5-2%, 0.5-3%, 0.4-1%.
It should be noted that, because the stress whitening phenomenon exists in polypropylene alone, in this embodiment, a certain amount of polyethylene and a certain amount of stress whitening resistance auxiliary agent are added, and the polyethylene and the stress whitening resistance auxiliary agent interact with each other to overcome the defect of polypropylene stress whitening, and further, the finally prepared polypropylene engineering plastic can have the stress whitening resistance by the polyethylene and the stress whitening resistance auxiliary agent in the above ratio.
The polypropylene has high impact resistance and high mechanical property toughness, so that when the polypropylene engineering plastic is prepared, the impact resistance and the mechanical property toughness of the finally synthesized polypropylene engineering plastic can be improved when the mass percentage of the polypropylene in the components of the mixture reaches a certain proportion.
Specifically, the stress whitening resistance auxiliary agent, the toughening agent, the low temperature resistance toughening agent, the dispersing agent, the solubilizer and the antioxidant are put into a high-speed mixer and stirred to obtain a stirred first mixture, which can be: and (3) putting the stress whitening resistant auxiliary agent, the toughening agent, the low-temperature resistant toughening agent, the dispersing agent, the solubilizer and the antioxidant into a high-speed mixer, and stirring for 1-3 minutes to obtain a stirred first mixture.
Step S103: and according to a preset second weight proportion, putting the dried polypropylene, the dried ethylene-propylene copolymer and the dried polyethylene into a high-speed mixer, and stirring to obtain a stirred second mixture.
After the polypropylene, the ethylene-propylene copolymer, and the polyethylene are dried, the dried polypropylene, the dried ethylene-propylene copolymer, and the dried polyethylene are put into a high-speed mixer and stirred to obtain a stirred second mixture.
Specifically, the dried polypropylene, the dried ethylene-propylene copolymer, and the dried polyethylene are put into a high-speed mixer and stirred to obtain a stirred second mixture, which may specifically be: and (3) placing the dried polypropylene, the dried ethylene-propylene copolymer and the dried polyethylene into a high-speed mixer, and stirring for 3-5 minutes to obtain a stirred second mixture.
In the present application, it should be noted that, the components are mixed in two steps, that is, the stress whitening resistant auxiliary, the toughening agent, the low temperature resistant toughening agent, the dispersing agent, the solubilizing agent and the antioxidant are put into a high-speed mixer and stirred in step S102 to obtain a stirred first mixture, and the dried polypropylene, the dried ethylene propylene copolymer and the dried polyethylene are put into a high-speed mixer and stirred in step S103 to obtain a stirred second mixture, and all the components (the dried polypropylene, the dried ethylene propylene copolymer, the dried polyethylene, the stress whitening resistant auxiliary, the toughening agent, the low temperature resistant toughening agent, the dispersing agent, the solubilizing agent and the antioxidant) are not directly and simultaneously mixed, so that the components are mixed more uniformly.
Step S104: and blending the first mixture and the second mixture, and putting the mixture into a high-speed mixer for stirring to obtain a stirred third mixture.
After the first mixture and the second mixture are obtained, the first mixture and the second mixture are blended and put into a high-speed mixer to be stirred, and a stirred third mixture is obtained.
Specifically, the first mixture and the second mixture are blended and put into a high-speed mixer to be stirred, so as to obtain a stirred third mixture, which may be: and blending the first mixture and the second mixture, and putting the mixture into a high-speed mixer to be stirred for 3-5 minutes to obtain a stirred third mixture.
Step S105: and putting the third mixture into a double-screw extruder for full melt blending, and extruding and granulating through the double-screw extruder to obtain the polypropylene engineering plastic.
And after obtaining the third mixture, putting the third mixture into a double-screw extruder for full melt blending, and extruding and granulating through the double-screw extruder to obtain the polypropylene engineering plastic.
Specifically, the third mixture is placed into a double-screw extruder for sufficient melt blending, and is extruded and granulated through the double-screw extruder to obtain the polypropylene engineering plastic, which can be: and putting the third mixture into a double-screw extruder with the melting temperature set to be 180-210 ℃ and the screw rotating speed set to be 300-500 r/min, fully melting and blending, and extruding and granulating through the double-screw extruder to obtain the polypropylene engineering plastic.
The sequence of the steps S101 to S103 is not sequential, as long as the step S101 is ensured to be before the step S103.
In this example, the stress whitening resistance aid is a beta nucleating agent. For example, N' -dicyclohexylterephthalamide or TMB-5 may be mentioned. Of course, N' -dicyclohexylterephthalamide and TMB-5 can be simultaneously used as the beta nucleating agent.
TMB-5 is a more common polypropylene beta-crystal form nucleating agent and has the characteristics of economy and high efficiency. The TMB-5 can further obtain beta-crystal form polypropylene with higher content by inducing beta crystallization. The beta-crystal form polypropylene has good impact resistance, heat distortion resistance and high porosity, so that the polypropylene has good impact resistance and heat distortion resistance. TMB-5 is especially suitable for PPR (polypropylene random copolymer) pipes, automobiles, household appliances and other modified PP products requiring high impact resistance and high thermal deformation, and can also be used for processing high porosity and printable film products such as PP artificial paper and the like.
Specifically, TMB-5 is an economic and efficient polypropylene beta-crystal nucleating agent, and TMB-5 has the function of improving the crystallization rate, the crystallinity and the beta-crystal conversion rate of a product, so that the product has excellent impact resistance, heat deformation resistance and high porosity. Researches show that by adding about 0.3 percent of TMB-5 into PP, the beta-crystal form conversion rate of a product (such as polypropylene) can be up to more than 90 percent, so that the impact strength and the heat distortion temperature of the product are greatly improved, wherein the impact strength is improved by 4-5 times, and the heat distortion temperature can be up to about 127 ℃.
In addition, compared with other types of beta-crystal nucleating agents, the TMB-5 also has the advantages of no coloring, improved product processability, low price, good beta-crystal stability and the like. TMB-5 can be directly mixed with PP powder for use, or can be prepared into master batch in advance and then is subjected to secondary processing for use. Of course, N, N' -dicyclohexylterephthalamide can also perform a similar function to TMB-5. Other types of beta nucleating agents may also be employed in this embodiment.
The toughening agent can be polyethylene octene co-elastomer (POE); the low temperature resistant toughening agent is a copolymer (EPDM) of ethylene and propylene; the toughening agent is an auxiliary agent which can reduce the brittleness of the composite material and improve the shock resistance of the composite material. The impact resistance of the synthesized polypropylene engineering plastic is improved by adding the toughening agent in the process of preparing the polypropylene engineering plastic. And the low-temperature resistant toughening agent is beneficial to improving the impact resistance of the synthesized polypropylene engineering plastic under the low-temperature condition.
The dispersant is at least one of stearic acid, OP wax and Ethylene Bis Stearamide (EBS); the solubilizer is ethylene-methyl acrylate-glycidyl methacrylate terpolymer (E-MA-GMA); the antioxidant is a compound of hindered phenol antioxidant 1010 and phosphite antioxidant 168.
The functional additive (such as stress whitening resistance additive) can be fully dispersed in dried polypropylene, dried ethylene-propylene copolymer and dried polyethylene in the process of preparing the polypropylene engineering plastic by the dispersant.
The preparation method of the polypropylene engineering plastic can be further illustrated by the following four examples
Example 1
In example 1, the mass ratio of each of the components of the dried polypropylene, the dried ethylene-propylene copolymer, the dried polyethylene, the stress whitening resistance auxiliary agent, the toughening agent, the low temperature resistant toughening agent, the dispersing agent, the solubilizing agent and the antioxidant in the finally mixed components is as follows: 50%, 15%, 10%, 5%, 8%, 1.5%, 2%, 0.5%.
The preparation method comprises the following steps:
(1) drying PP at 70-80 ℃ for 3-4 hours, and controlling the water content below 0.02 for later use; drying the PPR at 70-80 ℃ for 3-4 hours, and controlling the water content to be below 0.03 for later use; and drying the PE at 70-80 ℃ for 3-4 hours, and controlling the water content to be below 0.03 for later use.
(2) Weighing the stress-resistant whitening auxiliary agent, the toughening agent, the low-temperature-resistant toughening agent, the dispersing agent, the solubilizer and the antioxidant according to the weight ratio, putting the weighed stress-resistant whitening auxiliary agent, toughening agent, low-temperature-resistant toughening agent, dispersing agent, solubilizer and antioxidant into a high-speed mixer, stirring for 1-3 minutes, and uniformly mixing for later use.
(3) Weighing the PP, the PPR and the PE which are subjected to drying treatment according to the weight ratio, putting the weighed PP, PPR and PE which are subjected to drying treatment into a high-speed mixer, stirring for 3-5 minutes, and uniformly mixing.
(4) And (3) putting the mixture of the step (2) and the mixture of the step (3) into a high-speed mixer, stirring for 3-5 minutes, and uniformly mixing.
(5) And (3) putting the mixture mixed in the step (4) into a double-screw extruder for full melt blending, controlling the melting temperature to be 180-210 ℃ and the rotating speed of a screw to be 300-500 r/min, and extruding and granulating through the double-screw extruder.
Example 2
In example 2, the mass ratio of each of the components of the dried polypropylene, the dried ethylene-propylene copolymer, the dried polyethylene, the stress whitening resistance auxiliary agent, the toughening agent, the low temperature resistant toughening agent, the dispersing agent, the solubilizing agent and the antioxidant in the finally mixed components is as follows in sequence: 45%, 15%, 8%, 5%, 8%, 1.5%, 2%, 0.5%.
The preparation method comprises the following steps:
(1) drying PP at 70-80 ℃ for 3-4 hours, and controlling the water content below 0.02 for later use; drying the PPR at 70-80 ℃ for 3-4 hours, and controlling the water content to be below 0.03 for later use; and drying the PE at 70-80 ℃ for 3-4 hours, and controlling the water content to be below 0.03 for later use.
(2) Weighing the stress-resistant whitening auxiliary agent, the toughening agent, the low-temperature-resistant toughening agent, the dispersing agent, the solubilizer and the antioxidant according to the weight ratio, putting the weighed stress-resistant whitening auxiliary agent, toughening agent, low-temperature-resistant toughening agent, dispersing agent, solubilizer and antioxidant into a high-speed mixer, stirring for 1-3 minutes, and uniformly mixing for later use.
(3) Weighing the PP, the PPR and the PE which are subjected to drying treatment according to the weight ratio, putting the weighed PP, PPR and PE which are subjected to drying treatment into a high-speed mixer, stirring for 3-5 minutes, and uniformly mixing.
(4) And (3) putting the mixture of the step (2) and the mixture of the step (3) into a high-speed mixer, stirring for 3-5 minutes, and uniformly mixing.
(5) And (3) putting the mixture mixed in the step (4) into a double-screw extruder for full melt blending, controlling the melting temperature to be 180-210 ℃ and the rotating speed of a screw to be 300-500 r/min, and extruding and granulating through the double-screw extruder.
Example 3
In example 3, the mass ratio of each of the components of the dried polypropylene, the dried ethylene-propylene copolymer, the dried polyethylene, the stress whitening resistance auxiliary agent, the toughening agent, the low temperature resistant toughening agent, the dispersing agent, the solubilizing agent and the antioxidant in the finally mixed components is as follows in sequence: 40%, 15%, 20%, 8%, 7%, 6%, 1.5%, 2%, 0.5%.
The preparation method comprises the following steps:
(1) drying PP at 70-80 ℃ for 3-4 hours, and controlling the water content below 0.02 for later use; drying the PPR at 70-80 ℃ for 3-4 hours, and controlling the water content to be below 0.03 for later use; and drying the PE at 70-80 ℃ for 3-4 hours, and controlling the water content to be below 0.03 for later use.
(2) Weighing the stress-resistant whitening auxiliary agent, the toughening agent, the low-temperature-resistant toughening agent, the dispersing agent, the solubilizer and the antioxidant according to the weight ratio, putting the weighed stress-resistant whitening auxiliary agent, toughening agent, low-temperature-resistant toughening agent, dispersing agent, solubilizer and antioxidant into a high-speed mixer, stirring for 1-3 minutes, and uniformly mixing for later use.
(3) Weighing the PP, the PPR and the PE which are subjected to drying treatment according to the weight ratio, putting the weighed PP, PPR and PE which are subjected to drying treatment into a high-speed mixer, stirring for 3-5 minutes, and uniformly mixing.
(4) And (3) putting the mixture of the step (2) and the mixture of the step (3) into a high-speed mixer, stirring for 3-5 minutes, and uniformly mixing.
(5) And (3) putting the mixture mixed in the step (4) into a double-screw extruder for full melt blending, controlling the melting temperature to be 180-210 ℃ and the rotating speed of a screw to be 300-500 r/min, and extruding and granulating through the double-screw extruder.
Example 4
In example 4, the mass ratio of each of the components of the dried polypropylene, the dried ethylene-propylene copolymer, the dried polyethylene, the stress whitening resistance auxiliary agent, the toughening agent, the low temperature resistant toughening agent, the dispersing agent, the solubilizing agent, and the antioxidant in the finally mixed components is as follows in sequence: 40%, 20%, 15%, 6%, 7%, 8%, 1.5%, 2%, 0.5%.
The preparation method comprises the following steps:
(1) drying PP at 70-80 ℃ for 3-4 hours, and controlling the water content below 0.02 for later use; drying the PPR at 70-80 ℃ for 3-4 hours, and controlling the water content to be below 0.03 for later use; and drying the PE at 70-80 ℃ for 3-4 hours, and controlling the water content to be below 0.03 for later use.
(2) Weighing the stress-resistant whitening auxiliary agent, the toughening agent, the low-temperature-resistant toughening agent, the dispersing agent, the solubilizer and the antioxidant according to the weight ratio, putting the weighed stress-resistant whitening auxiliary agent, toughening agent, low-temperature-resistant toughening agent, dispersing agent, solubilizer and antioxidant into a high-speed mixer, stirring for 1-3 minutes, and uniformly mixing for later use.
(3) Weighing the PP, the PPR and the PE which are subjected to drying treatment according to the weight ratio, putting the weighed PP, PPR and PE which are subjected to drying treatment into a high-speed mixer, stirring for 3-5 minutes, and uniformly mixing.
(4) And (3) putting the mixture of the step (2) and the mixture of the step (3) into a high-speed mixer, stirring for 3-5 minutes, and uniformly mixing.
(5) And (3) putting the mixture mixed in the step (4) into a double-screw extruder for full melt blending, controlling the melting temperature to be 180-210 ℃ and the rotating speed of a screw to be 300-500 r/min, and extruding and granulating through the double-screw extruder.
The main technical indexes of the polypropylene engineering plastics prepared by the above 4 examples are shown in the following table 1:
Figure BDA0003156168570000101
table 1 technical indices of examples 1 to 4
The stress whitening resistance property items are: the height of 500g steel ball is 300mm, the steel ball freely falls on a suspended plastic sample wafer with the thickness of 100mm x 3mm, and the stress-free whitening phenomenon of the stress point of the sample wafer is observed after 24 hours.
As can be seen from the comparison of the above examples 1 to 4, the test data obtained by increasing the weight percentage ratio of the stress whitening resistance additive when the weight percentage ratio of the polypropylene is gradually decreased and the weight percentage ratio of the polyethylene is gradually increased in the comparative examples 1 to 3 are as shown in the above table: the specific gravity of the polypropylene engineering plastic is increased and then reduced; the melt index decreases first and then increases; the tensile strength is gradually reduced; the bending strength is firstly reduced and then increased; the flexural modulus decreases first and then increases; the notch impact strength is increased and then reduced; the notched impact strength at low temperature (-30 ℃) was gradually increased. However, it is clear from the comparison of examples 1 to 4 that the polypropylene engineering plastic produced has stress whitening resistance only when the mass percentage ratio of the stress whitening resistance auxiliary agent is increased to a certain extent.
By comparing example 1 with example 2, it can be seen that: when the mass percentage ratio of the toughening agent to the low-temperature resistant toughening agent is reduced, the tensile strength, the bending strength and the bending modulus are reduced. Meanwhile, by comparing the examples 1 and 3, when the mass percentage ratio of the toughening agent is reduced, the notch impact strength is reduced; similarly, by comparing example 3 with example 4, the notched impact strength at low temperature (-30 ℃) gradually increased when the low temperature toughener mass percentage ratio was increased.
By comparing example 3 with example 4, it can be seen that: when the percentage ratio of the low-temperature toughening agent is increased, the melt index is reduced, which indicates that the low-temperature resistance of the polypropylene engineering plastic can be possibly improved by properly increasing the percentage ratio of the low-temperature toughening agent.
Therefore, when the mass percentage ratio of the toughening agent to the low-temperature resistant toughening agent is increased in a proper amount during preparation of the polypropylene engineering plastic, the tensile strength, the bending strength and the bending modulus of the polypropylene engineering plastic can be increased, so that the toughness is increased, the external force collision resistance is improved, and the impact strength of the polypropylene engineering plastic is increased. And adding the stress whitening resistance auxiliary agent, wherein when the mass percentage ratio of the stress whitening resistance auxiliary agent is increased to a certain degree, the produced polypropylene engineering plastic has the stress whitening resistance.
In addition, the application also provides a polypropylene engineering plastic prepared by the preparation method of the polypropylene engineering plastic.
The polypropylene engineering plastic is prepared by mixing the polypropylene, the ethylene-propylene copolymer, the polyethylene, the stress whitening resistance auxiliary agent, the toughening agent, the low-temperature resistant toughening agent, the dispersing agent, the solubilizer and the antioxidant according to the preset weight proportion, so that the prepared polypropylene engineering plastic has the characteristics of high external force collision resistance, high temperature resistance, high and cold resistance, chemical corrosion resistance, stress whitening resistance and the like.
In addition, the polypropylene engineering plastic prepared by extruding and granulating through a double-screw extruder has good dimensional stability.
In addition, the application also provides another polypropylene engineering plastic, which comprises the following components in percentage by mass: 30 to 65 percent of dried polypropylene, 5 to 30 percent of dried ethylene propylene copolymer, 5 to 30 percent of dried polyethylene, 5 to 20 percent of stress whitening resistance auxiliary agent, 5 to 20 percent of toughening agent, 5 to 20 percent of low temperature resistant toughening agent, 0.5 to 2 percent of dispersing agent, 0.5 to 3 percent of solubilizer and 0.4 to 1 percent of antioxidant.
For detailed description information of the above-mentioned dried polypropylene, dried ethylene propylene copolymer, dried polyethylene, stress whitening resistance aid, toughening agent, low temperature resistance toughening agent, dispersant, solubilizer and antioxidant, reference is made to the detailed information of the above-mentioned dried polypropylene, dried ethylene propylene copolymer, dried polyethylene, stress whitening resistance aid, toughening agent, low temperature resistance toughening agent, dispersant, solubilizer and antioxidant introduced in the preparation method of the above-mentioned polypropylene engineering plastic, and details are not repeated here.
As long as the above-mentioned components in the prepared polypropylene engineering plastic are ensured: the weight percentage contents of the dried polypropylene, the dried ethylene-propylene copolymer, the dried polyethylene, the stress whitening resistance auxiliary agent, the toughening agent, the low temperature resistant toughening agent, the dispersing agent, the solubilizer and the antioxidant sequentially meet the following requirements: 30-65%, 5-30%, 5-20%, 0.5-2%, 0.5-3%, 0.4-1%, without limitation to the preparation method of the polypropylene engineering plastic.
Although the present application has been described with reference to the preferred embodiments, it is not intended to limit the present application, and those skilled in the art can make variations and modifications without departing from the spirit and scope of the present application, therefore, the scope of the present application should be determined by the claims that follow.

Claims (10)

1. The preparation method of the polypropylene engineering plastic is characterized by comprising the following steps:
respectively drying the polypropylene, the ethylene-propylene copolymer and the polyethylene to obtain dried polypropylene, dried ethylene-propylene copolymer and dried polyethylene;
according to a preset first weight proportion, putting a stress-resistant whitening auxiliary agent, a toughening agent, a low-temperature-resistant toughening agent, a dispersing agent, a solubilizing agent and an antioxidant into a high-speed mixer and stirring to obtain a stirred first mixture;
according to a preset second weight proportion, putting the dried polypropylene, the dried ethylene-propylene copolymer and the dried polyethylene into a high-speed mixer, and stirring to obtain a stirred second mixture;
blending the first mixture and the second mixture, and stirring the first mixture and the second mixture in a high-speed mixer to obtain a stirred third mixture;
and putting the third mixture into a double-screw extruder for full melt blending, and extruding and granulating through the double-screw extruder to obtain the polypropylene engineering plastic.
2. The method for preparing polypropylene engineering plastic according to claim 1, wherein the polypropylene, the ethylene propylene copolymer and the polyethylene are respectively dried to obtain dried polypropylene, dried ethylene propylene copolymer and dried polyethylene, and the method specifically comprises the following steps:
drying the polypropylene for 3-4 hours at 70-80 ℃, and controlling the water content of the polypropylene to be below 0.02 to obtain dried polypropylene;
drying the ethylene-propylene copolymer at 70-80 ℃ for 3-4 hours, and controlling the water content of the ethylene-propylene copolymer to be below 0.03 to obtain the dried ethylene-propylene copolymer;
and (3) drying the polyethylene at 70-80 ℃ for 3-4 hours, and controlling the water content of the polyethylene to be below 0.03 to obtain the dried polyethylene.
3. The preparation method of the polypropylene engineering plastic as claimed in claim 1, wherein the mass ratio of the components of the dried polypropylene, the dried ethylene-propylene copolymer, the dried polyethylene, the stress whitening resistance auxiliary agent, the toughening agent, the low temperature resistant toughening agent, the dispersing agent, the solubilizing agent and the antioxidant in the third mixture is as follows in sequence: 30 to 65 percent, 5 to 30 percent, 5 to 20 percent, 0.5 to 2 percent, 0.5 to 3 percent and 0.4 to 1 percent.
4. The preparation method of the polypropylene engineering plastic as claimed in claim 1, wherein the stress whitening resistance auxiliary agent is a beta nucleating agent; the toughening agent is a polyethylene octene co-elastomer; the low-temperature resistant toughening agent is a copolymer of ethylene and propylene; the dispersant is at least one of stearic acid, OP wax and ethylene bisstearamide; the solubilizer is ethylene-methyl acrylate-glycidyl methacrylate terpolymer; the antioxidant is a compound of hindered phenol antioxidant and phosphite antioxidant.
5. The preparation method of the polypropylene engineering plastic according to claim 1, wherein the stress whitening resistance auxiliary agent, the toughening agent, the low temperature resistant toughening agent, the dispersing agent, the solubilizing agent and the antioxidant are put into a high-speed mixer to be stirred to obtain a stirred first mixture, and the method comprises the following steps:
and (3) putting the stress whitening resistant auxiliary agent, the toughening agent, the low-temperature resistant toughening agent, the dispersing agent, the solubilizer and the antioxidant into a high-speed mixer, and stirring for 1-3 minutes to obtain a stirred first mixture.
6. The method for preparing polypropylene engineering plastic according to claim 1, wherein the step of placing the dried polypropylene, the dried ethylene-propylene copolymer and the dried polyethylene into a high-speed mixer for stirring to obtain a stirred second mixture comprises:
and putting the dried polypropylene, the dried ethylene-propylene copolymer and the dried polyethylene into a high-speed mixer, and stirring for 3-5 minutes to obtain a stirred second mixture.
7. The method for preparing polypropylene engineering plastic according to claim 1, wherein the blending the first mixture and the second mixture, placing the blended mixture into a high-speed mixer for stirring, and obtaining a stirred third mixture, comprises:
and blending the first mixture and the second mixture, and putting the mixture into a high-speed mixer to be stirred for 3-5 minutes to obtain a stirred third mixture.
8. The method for preparing the polypropylene engineering plastic according to claim 1, wherein the third mixture is placed into a twin-screw extruder for sufficient melt blending, and is extruded and pelletized by the twin-screw extruder to obtain the polypropylene engineering plastic, and the method comprises the following steps:
and putting the third mixture into a double-screw extruder with the melting temperature set to be 180-210 ℃ and the screw rotating speed set to be 300-500 r/min, fully melting and blending, and extruding and granulating through the double-screw extruder to obtain the polypropylene engineering plastic.
9. A polypropylene engineering plastic, which is prepared by the preparation method of the polypropylene engineering plastic as claimed in any one of claims 1 to 8.
10. The polypropylene engineering plastic is characterized by comprising the following components in percentage by mass:
30 to 65 percent of dried polypropylene, 5 to 30 percent of dried ethylene propylene copolymer, 5 to 30 percent of dried polyethylene, 5 to 20 percent of stress whitening resistance auxiliary agent, 5 to 20 percent of toughening agent, 5 to 20 percent of low temperature resistant toughening agent, 0.5 to 2 percent of dispersing agent, 0.5 to 3 percent of solubilizer and 0.4 to 1 percent of antioxidant.
CN202110779902.XA 2021-07-09 2021-07-09 Preparation method of polypropylene engineering plastic and polypropylene engineering plastic Pending CN113549267A (en)

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