CN111320819A - Low-cost food-grade self-lubricating polypropylene material and preparation method thereof - Google Patents
Low-cost food-grade self-lubricating polypropylene material and preparation method thereof Download PDFInfo
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- CN111320819A CN111320819A CN201911320461.6A CN201911320461A CN111320819A CN 111320819 A CN111320819 A CN 111320819A CN 201911320461 A CN201911320461 A CN 201911320461A CN 111320819 A CN111320819 A CN 111320819A
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- -1 polypropylene Polymers 0.000 title claims abstract description 78
- 239000004743 Polypropylene Substances 0.000 title claims abstract description 76
- 229920001155 polypropylene Polymers 0.000 title claims abstract description 76
- 239000000463 material Substances 0.000 title claims abstract description 60
- 238000002360 preparation method Methods 0.000 title abstract description 13
- FPAFDBFIGPHWGO-UHFFFAOYSA-N dioxosilane;oxomagnesium;hydrate Chemical compound O.[Mg]=O.[Mg]=O.[Mg]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O FPAFDBFIGPHWGO-UHFFFAOYSA-N 0.000 claims abstract description 38
- 239000006087 Silane Coupling Agent Substances 0.000 claims abstract description 23
- 239000000843 powder Substances 0.000 claims abstract description 21
- UAUDZVJPLUQNMU-UHFFFAOYSA-N Erucasaeureamid Natural products CCCCCCCCC=CCCCCCCCCCCCC(N)=O UAUDZVJPLUQNMU-UHFFFAOYSA-N 0.000 claims abstract description 20
- UAUDZVJPLUQNMU-KTKRTIGZSA-N erucamide Chemical compound CCCCCCCC\C=C/CCCCCCCCCCCC(N)=O UAUDZVJPLUQNMU-KTKRTIGZSA-N 0.000 claims abstract description 20
- 239000003963 antioxidant agent Substances 0.000 claims abstract description 19
- 230000003078 antioxidant effect Effects 0.000 claims abstract description 19
- 239000000314 lubricant Substances 0.000 claims abstract description 19
- 239000002994 raw material Substances 0.000 claims abstract description 12
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 30
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 18
- 229910052757 nitrogen Inorganic materials 0.000 claims description 15
- KAKZBPTYRLMSJV-UHFFFAOYSA-N Butadiene Chemical compound C=CC=C KAKZBPTYRLMSJV-UHFFFAOYSA-N 0.000 claims description 12
- 238000001035 drying Methods 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 9
- PKDCQJMRWCHQOH-UHFFFAOYSA-N triethoxysilicon Chemical compound CCO[Si](OCC)OCC PKDCQJMRWCHQOH-UHFFFAOYSA-N 0.000 claims description 9
- 235000020793 low-cost food Nutrition 0.000 claims description 8
- 238000002156 mixing Methods 0.000 claims description 8
- RKISUIUJZGSLEV-UHFFFAOYSA-N n-[2-(octadecanoylamino)ethyl]octadecanamide Chemical compound CCCCCCCCCCCCCCCCCC(=O)NCCNC(=O)CCCCCCCCCCCCCCCCC RKISUIUJZGSLEV-UHFFFAOYSA-N 0.000 claims description 8
- 238000010992 reflux Methods 0.000 claims description 7
- 238000003756 stirring Methods 0.000 claims description 7
- 239000004698 Polyethylene Substances 0.000 claims description 3
- 229920000573 polyethylene Polymers 0.000 claims description 3
- 125000001436 propyl group Chemical group [H]C([*])([H])C([H])([H])C([H])([H])[H] 0.000 claims description 3
- 150000007970 thio esters Chemical class 0.000 claims description 3
- 238000009826 distribution Methods 0.000 claims description 2
- 238000001914 filtration Methods 0.000 claims description 2
- 239000012760 heat stabilizer Substances 0.000 claims description 2
- 239000000155 melt Substances 0.000 claims description 2
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 claims description 2
- 239000002245 particle Substances 0.000 claims description 2
- 150000002989 phenols Chemical class 0.000 claims description 2
- OJMIONKXNSYLSR-UHFFFAOYSA-N phosphorous acid Chemical compound OP(O)O OJMIONKXNSYLSR-UHFFFAOYSA-N 0.000 claims description 2
- 229910052710 silicon Inorganic materials 0.000 claims description 2
- 239000010703 silicon Substances 0.000 claims description 2
- 238000001125 extrusion Methods 0.000 claims 1
- 238000005469 granulation Methods 0.000 claims 1
- 230000003179 granulation Effects 0.000 claims 1
- 239000000203 mixture Substances 0.000 claims 1
- 238000005461 lubrication Methods 0.000 abstract description 6
- 238000004519 manufacturing process Methods 0.000 abstract description 6
- 239000011248 coating agent Substances 0.000 abstract description 5
- 238000000576 coating method Methods 0.000 abstract description 5
- 235000013305 food Nutrition 0.000 abstract description 5
- 230000000694 effects Effects 0.000 abstract description 3
- 230000001050 lubricating effect Effects 0.000 abstract description 3
- 238000009776 industrial production Methods 0.000 abstract description 2
- 238000001746 injection moulding Methods 0.000 abstract description 2
- 230000032683 aging Effects 0.000 abstract 1
- 238000012360 testing method Methods 0.000 description 10
- 239000008187 granular material Substances 0.000 description 7
- 239000000243 solution Substances 0.000 description 7
- 238000004140 cleaning Methods 0.000 description 6
- 238000000605 extraction Methods 0.000 description 6
- 238000002844 melting Methods 0.000 description 6
- 230000008018 melting Effects 0.000 description 6
- 230000003068 static effect Effects 0.000 description 5
- 238000005303 weighing Methods 0.000 description 5
- ISWSIDIOOBJBQZ-UHFFFAOYSA-N Phenol Chemical compound OC1=CC=CC=C1 ISWSIDIOOBJBQZ-UHFFFAOYSA-N 0.000 description 4
- BGYHLZZASRKEJE-UHFFFAOYSA-N [3-[3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoyloxy]-2,2-bis[3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoyloxymethyl]propyl] 3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoate Chemical compound CC(C)(C)C1=C(O)C(C(C)(C)C)=CC(CCC(=O)OCC(COC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)(COC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)COC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)=C1 BGYHLZZASRKEJE-UHFFFAOYSA-N 0.000 description 4
- 238000005452 bending Methods 0.000 description 4
- 239000003153 chemical reaction reagent Substances 0.000 description 4
- 239000002131 composite material Substances 0.000 description 4
- 238000007334 copolymerization reaction Methods 0.000 description 4
- 238000001291 vacuum drying Methods 0.000 description 4
- 238000003828 vacuum filtration Methods 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- 238000013016 damping Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 238000011049 filling Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000000704 physical effect Effects 0.000 description 2
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 2
- 239000004810 polytetrafluoroethylene Substances 0.000 description 2
- VBICKXHEKHSIBG-UHFFFAOYSA-N 1-monostearoylglycerol Chemical compound CCCCCCCCCCCCCCCCCC(=O)OCC(O)CO VBICKXHEKHSIBG-UHFFFAOYSA-N 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- GHKOFFNLGXMVNJ-UHFFFAOYSA-N Didodecyl thiobispropanoate Chemical compound CCCCCCCCCCCCOC(=O)CCSCCC(=O)OCCCCCCCCCCCC GHKOFFNLGXMVNJ-UHFFFAOYSA-N 0.000 description 1
- 239000002216 antistatic agent Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 238000007676 flexural strength test Methods 0.000 description 1
- 239000005003 food packaging material Substances 0.000 description 1
- 239000013538 functional additive Substances 0.000 description 1
- 229940075529 glyceryl stearate Drugs 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000004611 light stabiliser Substances 0.000 description 1
- CWQXQMHSOZUFJS-UHFFFAOYSA-N molybdenum disulfide Chemical compound S=[Mo]=S CWQXQMHSOZUFJS-UHFFFAOYSA-N 0.000 description 1
- 229910052982 molybdenum disulfide Inorganic materials 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 229920005604 random copolymer Polymers 0.000 description 1
- 230000001954 sterilising effect Effects 0.000 description 1
- 238000004659 sterilization and disinfection Methods 0.000 description 1
- 230000001550 time effect Effects 0.000 description 1
- 229940124543 ultraviolet light absorber Drugs 0.000 description 1
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
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/014—Additives containing two or more different additives of the same subgroup in C08K
-
- 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
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- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Compositions Of Macromolecular Compounds (AREA)
- Lubricants (AREA)
Abstract
The invention discloses a low-cost food-grade self-lubricating polypropylene material and a preparation method thereof, wherein the polypropylene material is prepared from the following raw materials in parts by weight: 50-60 parts of polypropylene, 20-30 parts of talcum powder, 20-30 parts of polypropylene powder, 0.1-0.3 part of silane coupling agent, 0.2-1 part of antioxidant, 0.2-1 part of lubricant and 0.05-1 part of erucamide. Wherein, the talcum powder has wide source and can be directly used for industrial production, and the production cost can be greatly reduced; the erucamide is incompatible with the polypropylene, and can migrate to the surface of the material to form a lubricating layer in the preparation process, and the purpose of reducing the friction coefficient can be achieved only by adding a small amount of erucamide. Compared with the scheme of external lubrication of the coating, the material prepared by the invention is environment-friendly, the external lubrication effect can be achieved through injection molding, the problems of easy falling off of the coating of the self-lubricating product, short aging and high cost are solved from the material, and the material has the characteristics of low cost, self-lubrication and capability of meeting the food contact requirement.
Description
Technical Field
The invention relates to the technical field of high molecules, in particular to a low-cost food-grade self-lubricating polypropylene material and a preparation method thereof.
Background
With the development of science and technology, the environment-friendly, wear-resistant, long-life, low-friction and self-lubricating solid lubricating material is more and more widely applied to high-tech fields such as electronics, biology, communication, aerospace, aviation and the like. Self-lubricating materials appeared in the 30-40 s, which are inherently lubricious and can also be coated on other solid surfaces. At present, the commercial solid lubricant is mainly graphite, molybdenum disulfide, polytetrafluoroethylene and the like. The self-lubricating material is generally used in the form of powder, film or surface coating. The polypropylene (PP) has excellent physical properties and processability such as light specific gravity, low price, good mechanical property, good heat resistance and the like, can bear steam sterilization, is the fastest-developing material in general plastics, and is widely applied to food packaging and household appliance products. Common production modes of self-lubricating polypropylene in the market comprise methods of adding glyceryl stearate, polytetrafluoroethylene and the like, the cost is greatly improved compared with that of conventional modified polypropylene, and the food-grade contact standard cannot be well met.
Therefore, by combining the development experience of drawer type products of household appliances, refrigerators and the like, the self-lubricating effect is increased on the basis of conventional food-grade materials, and in the use process of the drawer, the damping sense is reduced, so that the daily drawing process becomes smoother, and the use experience of the products is optimized.
Disclosure of Invention
The invention aims to provide a low-cost food-grade self-lubricating polypropylene material and a preparation method thereof, and aims to solve the problems in the prior art.
The purpose of the invention is realized by the following technical scheme:
a low-cost food-grade self-lubricating polypropylene material comprises the following raw materials in parts by weight:
in a further aspect, the polypropylene is at least one of syndiotactic polypropylene and atactic polypropylene.
In a further scheme, the mass fraction of silicon in the talcum powder is more than 60%, the particle size distribution of the talcum powder is that D95 is less than 200nm, and the PH value is 7-9.
In a further scheme, the melt index of the polypropylene powder under the condition of 230 ℃/2.16KG is 10-17g/10 min; the polypropylene powder is different from polypropylene granules, the granule density is higher, and the granules sink preferentially, so that the talcum powder is accumulated, the rear bridge collapses, the feeding amount is increased suddenly, the production metering is inaccurate, and the production is influenced. The powder is white powder, has low density compared with granules, and is beneficial to improving the bridging phenomenon of the talcum powder filler.
In a further scheme, the silane coupling agent is at least one of butadiene triethoxy silane and bis- [ gamma- (triethoxy silicon) propyl ] tetrasulfide (Si-69).
In a further scheme, the antioxidant is at least one of hindered phenols, thioesters and phosphite heat stabilizers.
In a further scheme, the lubricant is at least one of polyethylene wax, stearate, ethylene bis stearamide and grafted ethylene bis stearamide.
Another object of the present invention is to provide a method for preparing the low-cost food grade self-lubricating polypropylene material, which comprises the following steps:
(1) adding a silane coupling agent into ethanol to obtain an ethanol solution of the silane coupling agent, drying talcum powder, adding the dried talcum powder into the solution, and sequentially stirring, refluxing, filtering, separating and drying to obtain surface-treated talcum powder;
(2) adding the surface-treated talcum powder, polypropylene powder, antioxidant, lubricant and erucamide into a mixer with nitrogen protection, and mixing at high speed for 2-10min to obtain a mixed material;
(3) before grain extraction, in order to ensure that a screw and a barrel of an extruder table meet the requirement of grade A cleaning, under the protection of nitrogen, putting the mixed material into a parallel double-screw extruder for melting, and extruding and granulating to obtain a low-cost food-grade self-lubricating polypropylene material; the cylinder temperature of the parallel double-screw extruder is 200-220 ℃, the screw rotating speed is 400-600r/min, and the vacuum degree is-0.04-0.1 MPa.
Compared with the prior art, the invention has the beneficial effects that:
(1) the low-cost food-grade self-lubricating polypropylene material is prepared from a general polypropylene base material, talcum powder, erucamide, a lubricant and an antioxidant, and the raw materials are low in price (the cost of the composite material can be greatly reduced by filling the talcum powder) and wide in source and can be directly used for industrial production; compared with the scheme of external lubrication of the coating, the method is more environment-friendly, and the external lubrication effect can be achieved through injection molding. The material of the invention has the characteristics of low cost, self lubrication and satisfaction of food contact requirements. The use experience that has improved domestic appliance drawer device in the aspect of the food package box, when optimizing kaifeng damping and feeling, satisfies the food contact requirement, has brought more convenient, the experience of safety for people's daily life.
(2) The erucamide component is added into the raw materials, because the erucamide is incompatible with the high molecular polymer polypropylene, the erucamide can migrate to the surface of the material to form a lubricating layer in the preparation process, and the purpose of reducing the friction coefficient can be achieved only by adding a small amount (the mass fraction is 0.2-1%). The problems of easy shedding of the self-lubricating product coating, short time effect and high cost are solved from the material aspect. The dynamic friction coefficient can be reduced by 0.05-0.1 under the standard experimental condition; can be widely applied to household appliances; food packaging material.
(3) The polypropylene powder is added into the raw materials, is different from polypropylene granules, has high granule density and preferentially sinks, so that the accumulated talcum powder, the rear bridge collapses, the feeding amount is increased suddenly, the production metering is inaccurate, and the production is influenced. The polypropylene powder used in the invention is white powder, has small density compared with granules, and is beneficial to improving the bridging phenomenon of talcum powder filling.
Detailed Description
The present invention will be further described with reference to the following examples. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The types and suppliers of reagents used in this example were as follows: the polypropylene is random copolymer polypropylene (China petrochemical group company PP 7227H), the talcum powder (Quanzhou Xufeng powder raw material company 955A, the polypropylene powder (Jinling petrochemical company Limited responsibility company PP powder 150) and the erucamide is UniSLIP 1753 erucamide, which are used for only explaining the sources and components of the reagents adopted in the experiment of the invention so as to be fully disclosed, and do not show that the invention can not be realized by adopting other similar reagents or reagents provided by other suppliers.
Example 1:
the low-cost food-grade self-lubricating polypropylene in the embodiment is prepared from the following raw materials in parts by weight:
the silane coupling agent adopts butadiene-based triethoxysilane, the antioxidant adopts hindered phenol antioxidant 1010, and the lubricant adopts ethylene bis stearamide;
the preparation method comprises the following steps:
(1) weighing 20 parts of dried talcum powder according to the proportion, stirring and refluxing for 15min at a low speed by using an ethanol solution of a silane coupling agent with the mass percentage concentration of 10% (wherein the using amount of the silane coupling agent is calculated according to 0.15 part in the formula), carrying out vacuum filtration, and drying in an electrothermal constant-temperature air-blast drying oven at 60 ℃ to constant weight to obtain the surface-treated talcum powder.
(2) Taking 60 parts of polypropylene, 20 parts of the surface-treated talcum powder prepared in the step (1), 20 parts of polypropylene powder, 0.2 part of antioxidant, 0.2 part of lubricant and 0.2 part of erucamide, and adding the components into a mixer which is communicated with nitrogen for high-speed mixing for 6 minutes to obtain a mixed material;
(3) before grain extraction, in order to ensure that a screw and a barrel of an extruder table meet the requirement of grade A cleaning, under the protection of nitrogen, putting the mixed material obtained in the step (2) into a parallel double-screw extruder for melting, and extruding and granulating to obtain a low-cost food-grade self-lubricating polypropylene material; wherein the temperature of a machine barrel of the extruder is 210 ℃, the rotating speed of a screw is 550r/min, and the vacuum degree is-0.04 MPa.
Example 2:
the low-cost food-grade self-lubricating polypropylene in the embodiment is prepared from the following raw materials in parts by weight:
the silane coupling agent adopts butadiene-based triethoxysilane, the antioxidant adopts hindered phenol antioxidant 1010, and the lubricant adopts ethylene bis stearamide;
the preparation method comprises the following steps:
(1) weighing 20 parts of dried talcum powder according to the proportion, stirring and refluxing for 15min at a low speed by using an ethanol solution of a silane coupling agent with the mass percentage concentration of 10% (wherein the using amount of the silane coupling agent is calculated according to 0.15 part in the formula), carrying out vacuum filtration, and drying in an electrothermal constant-temperature air-blast drying oven at 60 ℃ to constant weight to obtain the surface-treated talcum powder.
(2) Taking 60 parts of random copolymerization polypropylene, 20 parts of surface treated talcum powder prepared in the step (1), 20 parts of polypropylene powder, 0.2 part of antioxidant, 0.2 part of lubricant and 0.5 part of erucamide, and adding the components into a mixer with nitrogen protection for high-speed mixing for 6 minutes to obtain a mixed material;
(3) before grain extraction, in order to ensure that a screw and a barrel of an extruder table meet the requirement of grade A cleaning, under the protection of nitrogen, putting the mixed material obtained in the step (2) into a parallel double-screw extruder for melting, and extruding and granulating to obtain a low-cost food-grade self-lubricating polypropylene material; wherein the temperature of a machine barrel of the extruder is 210 ℃, the rotating speed of a screw is 550r/min, and the vacuum degree is-0.04 MPa.
Example 3:
the low-cost food-grade self-lubricating polypropylene in the embodiment is prepared from the following raw materials in parts by weight:
the silane coupling agent adopts butadiene-based triethoxysilane, the antioxidant adopts hindered phenol antioxidant 1010, and the lubricant adopts ethylene bis stearamide;
the preparation method comprises the following steps:
(1) weighing 20 parts of dried talcum powder according to the proportion, stirring and refluxing for 15min at a low speed by using an ethanol solution of a silane coupling agent with the mass percentage concentration of 10% (wherein the using amount of the silane coupling agent is calculated according to 0.15 part in the formula), and drying in an electrothermal constant-temperature air blast drying oven at 60 ℃ to constant weight to obtain the surface-treated talcum powder.
(2) Taking 60 parts of random copolymerization polypropylene, 20 parts of surface treated talcum powder prepared in the step (1), 20 parts of polypropylene powder, 0.2 part of antioxidant, 0.2 part of lubricant and 1 part of erucamide, and adding the materials into a mixer with nitrogen protection for high-speed mixing for 6 minutes to obtain a mixed material;
(3) before grain extraction, in order to ensure that a screw and a barrel of an extruder table meet the requirement of grade A cleaning, under the protection of nitrogen, putting the mixed material obtained in the step (2) into a parallel double-screw extruder for melting, and extruding and granulating to obtain a low-cost food-grade self-lubricating polypropylene material; wherein the temperature of a machine barrel of the extruder is 210 ℃, the rotating speed of a screw is 550r/min, and the vacuum degree is-0.04 MPa.
Example 4:
the low-cost food-grade self-lubricating polypropylene in the embodiment is prepared from the following raw materials in parts by weight:
the silane coupling agent adopts butadiene-based triethoxysilane, the antioxidant adopts hindered phenol antioxidant 1010, and the lubricant adopts ethylene bis stearamide;
the preparation method comprises the following steps:
(1) weighing 30 parts of dried talcum powder according to the proportion, stirring and refluxing for 15min at a low speed by using an ethanol solution of a silane coupling agent with the mass percentage concentration of 10% (wherein the using amount of the silane coupling agent is calculated according to 0.15 part in the formula), carrying out vacuum filtration, and drying in an electrothermal constant-temperature air-blast drying oven at 60 ℃ to constant weight to obtain the surface-treated talcum powder.
(2) Taking 50 parts of random copolymerization polypropylene, 30 parts of surface treated talcum powder prepared in the step (1), 20 parts of polypropylene powder, 0.2 part of antioxidant, 0.2 part of lubricant and 1 part of erucamide, and adding the materials into a mixer with nitrogen protection for high-speed mixing for 6 minutes to obtain a mixed material;
(3) before grain extraction, in order to ensure that a screw and a barrel of an extruder table meet the requirement of grade A cleaning, under the protection of nitrogen, putting the mixed material obtained in the step (2) into a parallel double-screw extruder for melting, and extruding and granulating to obtain a low-cost food-grade self-lubricating polypropylene material; wherein the temperature of a machine barrel of the extruder is 210 ℃, the rotating speed of a screw is 550r/min, and the vacuum degree is-0.04 MPa.
Example 5:
the low-cost food-grade self-lubricating polypropylene in the embodiment is prepared from the following raw materials in parts by weight:
the silane coupling agent uses bis- [ gamma- (triethoxy silicon) propyl ] tetrasulfide, the antioxidant uses thioester antioxidant DLTP, and the lubricant uses polyethylene wax;
the preparation method comprises the following steps:
(1) weighing 25 parts of dried talcum powder according to the proportion, stirring and refluxing for 15min at a low speed by using an ethanol solution of a silane coupling agent with the mass percentage concentration of 10% (wherein the using amount of the silane coupling agent is calculated according to 0.3 part in the formula), carrying out vacuum filtration, and drying in an electrothermal constant-temperature air-blast drying oven at 60 ℃ to constant weight to obtain the surface-treated talcum powder.
(2) Taking 50 parts of random copolymerization polypropylene, 25 parts of surface treated talcum powder prepared in the step (1), 25 parts of polypropylene powder, 1 part of antioxidant, 1 part of lubricant and 0.05 part of erucamide, adding the materials into a mixer with nitrogen protection, and mixing at high speed for 6 minutes to obtain a mixed material;
(3) before grain extraction, in order to ensure that a screw and a barrel of an extruder table meet the requirement of grade A cleaning, under the protection of nitrogen, putting the mixed material obtained in the step (2) into a parallel double-screw extruder for melting, and extruding and granulating to obtain a low-cost food-grade self-lubricating polypropylene material; wherein the temperature of a machine barrel of the extruder is 220 ℃, the rotating speed of a screw is 400r/min, and the vacuum degree is-0.01 MPa.
The main physical indexes of the low-cost food-grade self-lubricating polypropylene prepared in the above examples 1, 2, 3 and 4 are tested according to related test standards, such as tensile strength, elongation at break, bending strength, bending modulus, izod notched impact strength, static friction coefficient, dynamic friction coefficient and material cost, and the test standards and test results are shown in the following table 1:
table 1: examples 1-4 Main physical Properties of Low-cost food-grade self-lubricating Polypropylene
Note: the material cost is the material accounting cost of the market on the patent application date;
the conditions for the above test and the dimensions of the test bars are as follows:
the tensile strength test used bars with dimensions 172 x 10 x 4mm and a tensile rate of 50 mm/min;
the specimens used for the flexural strength test had a size of 80 x 10 x 4 and a bending rate of 2 mm/min;
the flexural modulus test used bars of 80 x 10 x 4 size with a bending rate of 2 mm/min;
the size of the sample bar used for the notch impact strength of the cantilever beam is 80 × 8 × 4;
relevant test conditions such as static friction coefficient and dynamic friction coefficient are as follows:
coefficient of dynamic friction: slider size 63 × 63 mm; the mass of the sliding block is 200 +/-2 g; the speed is 100 +/-10 mm/min.
Coefficient of static friction: slider size 63 × 63 mm; the mass of the sliding block is 200 +/-2 g; spring elastic coefficient of 2 +/-1N/cm
It can be seen from table 1 that the low-cost food-grade self-lubricating polypropylene prepared by the invention takes polypropylene as a base material, talcum powder, erucamide, a lubricant and an antioxidant are mixed, and the prepared composite material is extruded through reaction under the protection of nitrogen, when 0.5 part of erucamide is added, the rigidity of the prepared composite material is improved compared with that of a common polypropylene material, the static friction coefficient can be reduced by 0.12 in a standard static friction coefficient test, and the dynamic friction coefficient can be reduced by 0.11 in a standard dynamic friction coefficient test.
If functional additives such as ultraviolet light absorbers, light stabilizers, antistatic agents, coloring agents and the like are added into the preparation components, the composite material has corresponding characteristics and is also protected by the invention.
The embodiments described above are intended to facilitate one of ordinary skill in the art in understanding and using the present invention. It will be readily apparent to those skilled in the art that various modifications to these embodiments may be made, and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the embodiments described herein, and those skilled in the art should make improvements and modifications within the scope of the present invention based on the disclosure of the present invention.
Claims (10)
1. A low-cost food-grade self-lubricating polypropylene material is characterized in that: the composition comprises the following raw materials in parts by weight:
50-60 parts of polypropylene, namely polypropylene,
20-30 parts of talcum powder,
20-30 parts of polypropylene powder material,
0.1 to 0.3 portion of silane coupling agent,
0.2 to 1 part of antioxidant,
0.2 to 1 part of lubricant,
erucamide 0.05-1 part.
2. The low-cost food grade self-lubricating polypropylene material of claim 1, wherein: the polypropylene is at least one of syndiotactic polypropylene and atactic polypropylene.
3. The low-cost food grade self-lubricating polypropylene material of claim 1, wherein: the mass fraction of silicon in the talcum powder is more than 60%, and the particle size distribution of the talcum powder is that D95 is less than 200 nm.
4. The low-cost food grade self-lubricating polypropylene material of claim 1, wherein: the melt index of the polypropylene powder under the condition of 230 ℃/2.16kg is 10-17g/10 min.
5. The low-cost food grade self-lubricating polypropylene material of claim 1, wherein: the silane coupling agent is at least one of butadiene triethoxy silane and bis- [ gamma- (triethoxy silicon) propyl ] tetrasulfide.
6. The low-cost food grade self-lubricating polypropylene material of claim 1, wherein: the antioxidant is at least one of hindered phenols, thioesters and phosphite heat stabilizers.
7. The low-cost food grade self-lubricating polypropylene material of claim 1, wherein: the lubricant is at least one of polyethylene wax, stearate, ethylene bis-stearamide and grafted ethylene bis-stearamide.
8. A method for preparing a low-cost food grade self-lubricating polypropylene material according to any one of claims 1 to 7, wherein: the method comprises the following steps:
(1) adding a silane coupling agent into ethanol to obtain an ethanol solution of the silane coupling agent, drying talcum powder, adding the dried talcum powder into the solution, and sequentially stirring, refluxing, filtering, separating and drying to obtain surface-treated talcum powder;
(2) adding the surface-treated talcum powder, polypropylene powder, antioxidant, lubricant and erucamide into a mixer which is filled with nitrogen for protection, and mixing at high speed to obtain a mixed material;
(3) under the protection of nitrogen, the mixed materials are put into a parallel double-screw extruder to be melted, and the low-cost food-grade self-lubricating polypropylene material is prepared through extrusion and granulation.
9. The method of claim 8, wherein: in the step (2), the high-speed mixing time is 2-10 min.
10. The method of claim 8, wherein: in the step (3), the cylinder temperature of the parallel double-screw extruder is 200-.
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Application publication date: 20200623 |