CN110885501B - Anti-dust-absorption polypropylene composite with good appearance and preparation method thereof - Google Patents
Anti-dust-absorption polypropylene composite with good appearance and preparation method thereof Download PDFInfo
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- CN110885501B CN110885501B CN201911285656.1A CN201911285656A CN110885501B CN 110885501 B CN110885501 B CN 110885501B CN 201911285656 A CN201911285656 A CN 201911285656A CN 110885501 B CN110885501 B CN 110885501B
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L23/10—Homopolymers or copolymers of propene
- C08L23/14—Copolymers of propene
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- 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
- C08K2201/002—Physical properties
- C08K2201/005—Additives being defined by their particle size in general
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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
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
- C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2207/00—Properties characterising the ingredient of the composition
- C08L2207/06—Properties of polyethylene
- C08L2207/066—LDPE (radical process)
Abstract
The invention provides a polypropylene composite with good dust absorption resistance and appearance, which comprises the following raw materials in parts by weight: polypropylene: 30-98 parts of a solvent; polyethylene: 1-10 parts; propylene-based elastomer: 1-15 parts; dust-proof agent: 0.2-2 parts; processing oil substitutes: 0.5-5 parts; main antioxidant: 0.1-0.5 part; auxiliary antioxidant: 0.1-0.5 part; light stabilizer: 0.1-0.5 part. The polypropylene composite with good dust absorption resistance and appearance is characterized in that the polyethylene is VLDPE, the propenyl elastomer is an ethylene-propylene copolymer, and the processing oil substitute is an ethoxy lauryl tyramine polyvinyl amine aqueous solution. The invention adopts the masterbatching technology, avoids the use and precipitation of lubricant, processing oil and additive by selecting the raw materials, and prepares the polypropylene compound with dust absorption resistance and good appearance.
Description
Technical Field
The invention belongs to the technical field of polypropylene materials, and particularly relates to a polypropylene compound with good dust absorption resistance and appearance and a preparation method thereof.
Background
Polypropylene has the advantages of low density, low price, easy processing and the like, and is widely applied to industries such as automobiles, household appliances and the like, but a workpiece prepared from polypropylene material is particularly easy to adsorb dust in the air when placed in the air, a dust layer is formed on the surface of the workpiece, and the workpiece is difficult to wipe off, so that modification in the aspect of resisting dust adsorption is needed.
The currently adopted anti-dust absorption method mainly comprises the addition of an antistatic agent or a conductive compound and the like. CN109867861A achieves the dustproof effect by adding cage type polysilsesquioxane and antistatic auxiliary agent; patent 201810227583.X achieves an antistatic effect by adding hyperbranched polyethyleneimine; patent 201811122706.X adopts a multiwalled carbon nanotube-montmorillonite composite reinforcing filler to achieve a dustproof effect; patent 201710812697.6 achieves this effect by adding a dust control agent. These measures can achieve a certain effect, but in actual use, it is found that a part of dust can be adsorbed, and a dust-free effect cannot be achieved. This is mainly because the mechanism of dust adsorption of polypropylene parts after injection moulding includes 2: firstly, the static adsorption is realized, polypropylene is a non-polar material, static electricity is generated on the surface in a dry environment, and dust in air is adsorbed, and the mechanism can be eliminated by adding an antistatic agent or a conductive compound; and secondly, physical adsorption is mainly caused by that the crystallinity of polypropylene is gradually improved in the process of placing the polypropylene after injection molding, and substances such as lubricants, processing oil, small materials and the like in the polypropylene material are gradually separated out to the surface of a workpiece to adsorb dust in the air to form dendritic dust grains which are difficult to wipe. In addition, at present, in the actual injection molding production process, the mechanical arm is adopted to grab and transfer the polypropylene part under many conditions, and the mechanical arm sucker forms a sucker mark on the surface of the polypropylene part, so that the appearance of the part is poor, and the mark is easy to adsorb dust to cause the dust absorption phenomenon. The suction cup imprint is related to the quality and the negative pressure of the suction cup and also related to a polypropylene material, firstly, a lubricant, processing oil, small materials and the like in the polypropylene material are separated out in an accelerated way under the negative pressure condition, and the surface concentration of the suction cup imprint is obviously higher than the periphery of the suction cup; and secondly, a polypropylene continuous phase is formed on the surface layer of a workpiece when the polypropylene material is molten and flows, and the surface layer is damaged to form a sucker mark due to the adsorption stress of the sucker. Aiming at the second mechanism of the ash suction and the blotting problem of the suction cup, no relevant patent is provided for solving the problem.
Disclosure of Invention
In view of this, the invention aims to provide a polypropylene composite with good dust absorption resistance and appearance, which can effectively remove static dust absorption, physical dust absorption and sucker marks caused by materials, and has the characteristics of dust absorption resistance, good appearance and the like.
The invention also aims to provide a preparation method of the polypropylene composite with good dust absorption resistance and appearance.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
the polypropylene composite with good dust absorption resistance and appearance comprises the following raw materials in parts by weight:
polypropylene: 30-98 parts of a solvent;
polyethylene: 1-10 parts;
propylene-based elastomer: 1-15 parts;
dust-proof agent: 0.2-2 parts;
processing oil substitutes: 0.5-5 parts;
main antioxidant: 0.1-0.5 part;
auxiliary antioxidant: 0.1-0.5 part;
light stabilizer: 0.1-0.5 part;
elastomer: 0-30 parts;
mineral powder: 0-40 parts;
the polyethylene is VLDPE, the Melt Flow Rate (MFR) of the polyethylene is 0.5-1.5g/10min at 190 ℃ and 2.16Kg, and the density of the polyethylene is 0.905-0.915g/cm3Polypropylene and polyethylene viscosity ratio K1 ≥ 30, where K1 ═ MFR (PP)/MFR (VLDPE);
the elastomer is POE, the Melt Flow Rate (MFR) of the elastomer is 0.5-5g/10min under the conditions of 190 ℃ and 2.16Kg, and the density of the elastomer is 0.85-0.90g/cm3(ii) a Further, the viscosity ratio K2 of the polypropylene/VLDPE mixture to POE is more than or equal to 30, wherein K2 is MFR (PP + VLDPE)/MFR (POE).
Further, the propylene-based elastomer is an ethylene-propylene copolymer, the propylene content is 80-92%, the Shore hardness is less than or equal to 40D under the condition of 15S, and the melt flow rate is 1-50g/10min under the conditions of 230 ℃ and 2.16 Kg;
the mineral powder is talcum powder, and the particle size of the talcum powder is less than or equal to 10 mu m; further, the haze of the talcum powder is more than or equal to 95%.
Further, the processing oil substitute is an aqueous solution of ethoxylated lauryl tyramine polyvinylamine, wherein the concentration of ethoxylated lauryl tyramine is 10-30%, and the concentration of polyvinylamine is 10-20%.
Furthermore, the main antioxidant is hindered phenol antioxidant, the melting point is more than or equal to 160 ℃, the molecular weight is more than or equal to 600, the precipitation parameter Y1 is more than or equal to 15, and the precipitation parameter Y1 is melting point (unit ℃) multiplied by molecular weight multiplied by 25 ℃ cyclohexane solubility (unit g/100g) multiplied by purity (unit%)/10000;
the auxiliary antioxidant is phosphite antioxidant, the melting point is more than or equal to 160 ℃, the molecular weight is more than or equal to 600, the precipitation parameter Y2 is more than or equal to 15, and the precipitation parameter Y2 is melting point (unit ℃) multiplied by molecular weight multiplied by 25 ℃ cyclohexane solubility (unit g/100g) multiplied by purity (unit%)/10000;
the light stabilizer is a hindered amine light stabilizer, the molecular weight of the light stabilizer is more than or equal to 2000, the appearance of the light stabilizer is granular, and both the grain diameter and the grain length of the granules are more than or equal to 0.5 mm.
Further, the polypropylene is a propylene copolymer, and the Melt Flow Rate (MFR) of the propylene copolymer is 20-120g/10min under the conditions of 230 ℃ and 2.16 Kg;
the dust-proof agent is glycerol monostearate as an antistatic agent, the appearance of the dust-proof agent is granular, and the grain diameter and the grain length of the granules are both more than or equal to 0.5 mm.
A preparation method of a polypropylene composite with good dust absorption resistance and appearance comprises the following steps:
1) adding talcum powder, propenyl elastomer, auxiliary antioxidant and processing oil substitute into an internal mixer or other meshing equipment, uniformly mixing, and then granulating to obtain talcum powder master batch;
2) adding the main antioxidant, the auxiliary antioxidant, the light stabilizer, the processing oil substitute and the propenyl elastomer into an internal mixer or other meshing equipment, uniformly mixing, and then granulating to obtain additive masterbatch;
3) adding polypropylene, polyethylene, elastomer and talcum powder master batches into a mixing machine, uniformly mixing, then adding a processing oil substitute, continuously mixing, then adding a dust-proof agent and an additive master batch, uniformly mixing, adding into a main feed port of a double-screw extruder, carrying out melt blending, and carrying out vacuum extrusion granulation to obtain the polypropylene composite material with good dust absorption resistance and appearance.
Further, the talcum powder master batch comprises the following raw materials in parts by weight:
further, the additive master batch comprises the following raw materials in parts by weight:
further, the processing temperature of the double-screw extruder is 180-230 ℃, and the vacuum degree is less than or equal to-0.1 MPa.
Compared with the prior art, the polypropylene composite with good dust absorption resistance and appearance and the preparation method thereof have the following advantages:
(1) the polypropylene composite with dust absorption resistance and good appearance is prepared by compounding the propylene-based elastomer and the processing oil substitute, so that the talcum powder master batch and the additive master batch are prepared, and the lubricant is prevented from being used and separated out while the talcum powder and the additive can be well dispersed.
(2) According to the polypropylene composite with good dust absorption resistance and appearance, the ethoxy lauryl tyramine polyethylene amine aqueous solution is used as a processing oil substitute, so that the dust absorption phenomenon caused by the precipitation of the processing oil is avoided, and the precipitation of the ethoxy lauryl tyramine can improve the surface resistance of the polypropylene composite and avoid the generation of dust absorption. Due to the fact that the polyvinyl amine is compounded, the separation of the ethoxy lauryl tyramine can be accelerated, the difference between the separation caused by negative pressure at a manipulator sucker and the separation at a non-sucker is reduced, and the phenomena of sucker marks and mark ash absorption are avoided.
(3) The polypropylene composite with good appearance and dust absorption resistance is produced by using a master batch technology and granulated raw materials, and is produced by using a processing oil substitute, so that the dust absorption phenomenon caused by the use and precipitation of processing oil is avoided.
(4) According to the polypropylene composite with good dust absorption resistance and appearance, the dispersion and precipitation of the elastomer in the polypropylene melt are influenced by controlling the viscosity ratio of PP, VLDPE and POE, an elastic layer is formed on the surface layer of a workpiece, and the generation of marks of a sucker of a manipulator is greatly reduced.
Detailed Description
Unless defined otherwise, technical terms used in the following examples have the same meanings as commonly understood by one of ordinary skill in the art to which the present invention belongs. The test reagents used in the following examples, unless otherwise specified, are all conventional biochemical reagents; the experimental methods are conventional methods unless otherwise specified.
Raw materials and sources referred to in the examples and comparative examples
The polyethylene is VLDPE, and has a melt flow rate of 1.0g/10min at 190 deg.C and 2.16Kg, and a density of 0.912g/cm3；
Dust-proof agent: an antistatic agent 163;
processing oil substitutes: an aqueous solution of ethoxylated lauryl tyramine polyvinylamine, wherein the concentration of ethoxylated lauryl tyramine is 20% and the concentration of polyvinylamine is 15%;
hindered phenol antioxidant: antioxidant 1790, melting point 160 ℃, molecular weight 700, precipitation parameter Y1 being 16.6;
phosphite ester antioxidant: antioxidant 168, melting point 183 deg.c, molecular weight 647, and precipitation parameter Y2-128.7;
hindered amine light stabilizer: light stabilizer 944, molecular weight 2100-;
talc powder: HTP2L with particle size of 2.4 μm, heating at 120 deg.C to haze value of 95% or more;
elastomer: POE 8150 with Melt Flow Rate (MFR) of 0.5g/10min at 190 deg.C and 2.16Kg and density of 0.868g/cm3。
Second, examples and comparative examples
The present invention will be described in detail with reference to examples.
Example 1
The raw material formula of the polypropylene compound with good dust absorption resistance and appearance is shown in table 1, and the preparation method comprises the following steps:
1) adding the main antioxidant, the auxiliary antioxidant, the light stabilizer, the processing oil substitute and the propenyl elastomer into an internal mixer or other meshing equipment, uniformly mixing, and then granulating to obtain additive masterbatch;
2) adding polypropylene and polyethylene into a mixer, uniformly mixing, adding a processing oil substitute, continuously mixing, adding a dustproof agent and additive master batches, uniformly mixing, adding into a main feed port of a double-screw extruder, carrying out melt blending, and carrying out vacuum extrusion granulation to obtain the polypropylene composite material with good dust absorption resistance and appearance;
the processing temperature of the double-screw extruder is 180 ℃, and the vacuum degree is-0.1 MPa;
the polypropylene is copolymerized polypropylene, and the melt flow rate of the polypropylene is 30g/10min under the conditions of 230 ℃ and 2.16 kg; the propylene-based elastomer used had a propylene content of 89%, a Shore hardness of 34D under 15S, and a melt flow rate of 3g/10min under the conditions of 230 ℃ and 2.16 Kg.
Example 2
The raw material formula of the polypropylene compound with good dust absorption resistance and appearance is shown in table 1, and the preparation method comprises the following steps:
1) adding talcum powder, propenyl elastomer, auxiliary antioxidant and processing oil substitute into an internal mixer or other meshing equipment, uniformly mixing, and then granulating to obtain talcum powder master batch;
2) adding the main antioxidant, the auxiliary antioxidant, the light stabilizer, the processing oil substitute and the propenyl elastomer into an internal mixer or other meshing equipment, uniformly mixing, and then granulating to obtain additive master batches;
3) adding master batches of polypropylene, polyethylene, elastomer and talcum powder into a mixing machine, uniformly mixing, then adding a processing oil substitute, continuously mixing, then adding a dust-proof agent and an additive master batch, uniformly mixing, adding the mixture into a main feed port of a double-screw extruder, carrying out melt blending, and carrying out vacuum extrusion granulation to obtain the polypropylene composite material with good dust absorption resistance and appearance;
the processing temperature of the double-screw extruder is 200 ℃, and the vacuum degree is-0.1 Mpa;
the polypropylene is copolymerized polypropylene, and the melt flow rate of the polypropylene is 60g/10min under the conditions of 230 ℃ and 2.16 kg; the propylene-based elastomer used had a propylene content of 91%, a Shore hardness of 40D under 15S conditions, and a melt flow rate of 8g/10min under 2.16Kg conditions at 230 ℃.
Example 3
The raw material formula of the polypropylene compound with good dust absorption resistance and appearance is shown in table 1, and the preparation method comprises the following steps:
1) adding the talcum powder, the propenyl elastomer, the auxiliary antioxidant and the processing oil substitute into an internal mixer or other meshing equipment, uniformly mixing, and then granulating to obtain talcum powder master batches;
2) adding the main antioxidant, the auxiliary antioxidant, the light stabilizer, the processing oil substitute and the propenyl elastomer into an internal mixer or other meshing equipment, uniformly mixing, and then granulating to obtain additive masterbatch;
3) adding master batches of polypropylene, polyethylene, elastomer and talcum powder into a mixing machine, uniformly mixing, then adding a processing oil substitute, continuously mixing, then adding a dust-proof agent and an additive master batch, uniformly mixing, adding the mixture into a main feed port of a double-screw extruder, carrying out melt blending, and carrying out vacuum extrusion granulation to obtain the polypropylene composite material with good dust absorption resistance and appearance;
the processing temperature of the double-screw extruder is 210 ℃, and the vacuum degree is-0.1 MPa;
the polypropylene is copolymerized polypropylene, and the melt flow rate of the polypropylene is 90g/10min under the conditions of 230 ℃ and 2.16 kg; the propylene-based elastomer used has a propylene content of 85%, a Shore hardness of 66A under the condition of 15S, and a melt flow rate of 20g/10min under the conditions of 230 ℃ and 2.16 Kg.
Example 4
The raw material formula of the polypropylene compound with good dust absorption resistance and appearance is shown in table 1, and the preparation method comprises the following steps:
1) adding talcum powder, propenyl elastomer, auxiliary antioxidant and processing oil substitute into an internal mixer or other meshing equipment, uniformly mixing, and then granulating to obtain talcum powder master batch;
2) adding the main antioxidant, the auxiliary antioxidant, the light stabilizer, the processing oil substitute and the propenyl elastomer into an internal mixer or other meshing equipment, uniformly mixing, and then granulating to obtain additive masterbatch;
3) adding master batches of polypropylene, polyethylene, elastomer and talcum powder into a mixing machine, uniformly mixing, then adding a processing oil substitute, continuously mixing, then adding a dust-proof agent and an additive master batch, uniformly mixing, adding the mixture into a main feed port of a double-screw extruder, carrying out melt blending, and carrying out vacuum extrusion granulation to obtain the polypropylene composite material with good dust absorption resistance and appearance;
the processing temperature of the double-screw extruder is 230 ℃, and the vacuum degree is-0.1 MPa;
the polypropylene is copolymerized polypropylene, and the melt flow rate of the polypropylene is 100g/10min under the conditions of 230 ℃ and 2.16 kg; the propylene-based elastomer used had a propylene content of 87%, a Shore hardness of 71A under 15S, and a melt flow rate of 48g/10min under 230 ℃ and 2.16 Kg.
Comparative example 1
The raw material formula of the polypropylene compound with good dust absorption resistance and appearance is shown in table 1, and the preparation method comprises the following steps:
1) adding the talcum powder, the propenyl elastomer, the auxiliary antioxidant and the processing oil into an internal mixer or other meshing equipment, uniformly mixing, and then granulating to obtain talcum powder master batches;
2) adding the main antioxidant, the auxiliary antioxidant, the light stabilizer, the processing oil and the propenyl elastomer into an internal mixer or other meshing equipment, uniformly mixing, and then granulating to obtain additive masterbatch;
3) adding master batches of polypropylene, polyethylene, elastomer and talcum powder into a mixing machine, uniformly mixing, then adding processing oil, continuously mixing, then adding the dustproof agent, the lubricant and the additive master batch, uniformly mixing, then adding the mixture into a main feeding port of a double-screw extruder, carrying out melt blending, and carrying out vacuum extrusion granulation to obtain the polypropylene composite material;
the processing temperature of the double-screw extruder is 200 ℃, and the vacuum degree is-0.1 Mpa;
the polypropylene is copolymerized polypropylene, and the melt flow rate of the polypropylene is 60g/10min under the conditions of 230 ℃ and 2.16 kg; the used propylene-based elastomer has the propylene content of 91 percent, the Shore hardness of 40D under the condition of 15S, and the melt flow rate of 8g/10min under the conditions of 230 ℃ and 2.16 Kg; the processing oil is white oil; the lubricant is EBS.
Comparative example 2
The raw material formula of the polypropylene compound with good dust absorption resistance and appearance is shown in table 1, and the preparation method comprises the following steps:
1) adding talcum powder, polypropylene, auxiliary antioxidant and processing oil into an internal mixer or other meshing equipment, uniformly mixing, and then granulating to obtain talcum powder master batches;
2) adding the main antioxidant, the auxiliary antioxidant, the light stabilizer, the processing oil and the polypropylene into an internal mixer or other meshing equipment, uniformly mixing, and then granulating to obtain additive masterbatch;
3) adding polypropylene, elastomer and talcum powder master batches into a mixing machine, uniformly mixing, then adding processing oil, continuously mixing, then adding a dustproof agent, a lubricating agent and an additive master batch, uniformly mixing, then adding into a main feed port of a double-screw extruder, carrying out melt blending, and carrying out vacuum extrusion granulation to obtain the polypropylene composite material;
the processing temperature of the double-screw extruder is 200 ℃, and the vacuum degree is-0.1 MPa;
the polypropylene is copolymerized polypropylene, and the melt flow rate of the polypropylene is 60g/10min under the conditions of 230 ℃ and 2.16 kg; the processing oil is white oil; the lubricant is EBS.
Comparative example 3
The raw material formula of the polypropylene compound with good dust absorption resistance and appearance is shown in table 1, and the preparation method comprises the following steps:
1) adding polypropylene, elastomer and talcum powder into a mixer, mixing uniformly, adding processing oil, mixing continuously, adding a dustproof agent, a main antioxidant, an auxiliary antioxidant, a light stabilizer and a lubricant, mixing uniformly, adding into a main feed port of a double-screw extruder, carrying out melt blending, and carrying out vacuum extrusion granulation to obtain the polypropylene composite material.
The processing temperature of the double-screw extruder is 200 ℃, and the vacuum degree is-0.1 MPa;
the polypropylene is copolymerized polypropylene, and the melt flow rate of the polypropylene is 60g/10min under the conditions of 230 ℃ and 2.16 kg; the processing oil is white oil; the lubricant is EBS.
TABLE 1 raw material formulation (unit: kg) of polypropylene materials of examples and comparative examples
Third, Performance testing of example and comparative Polypropylene composites
The materials prepared in the above examples and comparative examples were injection molded to prepare test specimens, and the test results are shown in table 4. Wherein:
(1) melt Flow Rate (MFR): the test is carried out according to GB/T3682, wherein the test conditions of the polypropylene and polypropylene compound are 230 ℃ and 2.16kg, and the test conditions of the polyethylene and POE are 190 ℃ and 2.16 kg.
(2) Polypropylene and polyethylene have a viscosity ratio K1, where K1 ═ mfr (pp)/mfr (vldpe).
(3) Viscosity ratio K2 of polypropylene/polyethylene mixture to POE, where K2 ═ MFR (PP + VLDPE)/MFR (POE).
(4) Surface resistance: A100X 3mm square plate was injection molded, left under standard conditions for 24 hours, and tested for surface resistance.
(5) And (3) ash absorption resistance verification: and (3) injection molding a 200X 150X 3mm rectangular plate, continuously and vertically placing the rectangular plate outdoors for 240h under natural conditions, observing the surface ash absorption phenomenon, and judging the standard as shown in Table 2, wherein the standard of 1(Q1) is met.
TABLE 2 dust absorption rating of the surface of the part
| Grade | Amount of dust | Grade | Difficulty of removal |
| 0 | Dust-free | Q0 | Does not need to be cleaned |
| 1 | Little dust | Q1 | Need to be removed by vibration |
| 2 | A small amount of dust | Q2 | Need to be cleaned by natural wind |
| 3 | Moderate amount of dust | Q3 | Need to be cleaned by compressed air |
| 4 | With a relatively large amount of dust | Q4 | Need to be cleaned by cleaning cloth |
| 5 | A large amount of dust | Q5 | Need to be cleaned by special solvents |
(6) Verifying the blot of the sucker: and (3) injection molding a 200X 150X 3mm rectangular plate, adopting a sucker to simulate a mechanical arm to adsorb for 60 seconds, observing the visible condition of the surface print, and judging the standard as shown in Table 3, wherein the standard of J1(Q1) is judged to be satisfied.
TABLE 3 suction cup print visualization
Table 4 performance test results of polypropylene composites of examples and comparative examples
As can be seen from the product test results of the respective examples and comparative examples in table 2:
comparative example 1 the processing oil substitute was removed from example 2, the processing oil and the lubricant were used, the dust on the surface of the workpiece increased and the workpiece was cleaned by compressed air, the suction cup had a remarkable mark, and the workpiece was wiped by a cleaning cloth.
Comparative example 2 on the basis of example 2, processing oil substitutes, polyethylene and propylene-based elastomers are removed, processing oil, lubricants and polypropylene are respectively used, the dust on the surface of the workpiece is further increased, compressed air is used for removing the dust, the suction disc mark is more obvious, and the workpiece needs to be wiped by a cleaning cloth.
Comparative example 3 on the basis of example 2, processing oil substitutes, polyethylene and propylene-based elastomers are removed, a master granulation process is removed, and talcum powder, an antioxidant, a light stabilizer and a lubricant are directly added, so that a large amount of processing oil is needed, the surface of a workpiece generates a large amount of dust and needs to be cleaned by a cleaning cloth, the suction cup has a serious mark and is difficult to clean, and the workpiece needs to be cleaned by a special solvent.
The polypropylene composite material with good dust absorption resistance and appearance adopts the propenyl elastomer and the processing oil substitute to be compounded for preparing the talcum powder master batch and the additive master batch, and simultaneously adopts the ethyoxyl lauryl tyramine polyethylene amine water solution as the processing oil substitute, so that the use and the precipitation of a lubricant and processing oil are avoided; by selecting additives such as a main antioxidant, an auxiliary antioxidant, a light stabilizer and the like, the use and precipitation of the additives are avoided; by controlling the viscosity ratio of PP, VLDPE and POE, the dispersion and precipitation of the elastomer in the polypropylene melt are further influenced, and an elastic layer is formed on the surface layer of the workpiece, so that the generation of mechanical arm sucker marks is greatly reduced, and the good appearance of the polypropylene compound is ensured.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (8)
1. A polypropylene composite with good dust absorption resistance and appearance is characterized in that: the formula comprises the following raw materials in parts by weight:
polypropylene: 30-98 parts of a solvent;
polyethylene: 1-10 parts;
propylene-based elastomer: 1-15 parts;
dust-proof agent: 0.2-2 parts;
processing oil substitutes: 0.5-5 parts;
main antioxidant: 0.1-0.5 part;
auxiliary antioxidant: 0.1-0.5 part;
light stabilizer: 0.1-0.5 part;
elastomer: 0-30 parts;
mineral powder: 0-40 parts;
the polyethylene is VLDPE, the Melt Flow Rate (MFR) of the VLDPE is 0.5-1.5g/10min at 190 ℃ and 2.16Kg, and the density is 0.905-0.915g/cm3Polypropylene and polyethylene viscosity ratio K1 ≧ 30, where K1= MFR (PP)/MFR (VLDPE);
the elastomer is POE, the Melt Flow Rate (MFR) of the elastomer is 0.5-5g/10min under the conditions of 190 ℃ and 2.16Kg, and the density of the elastomer is 0.85-0.90g/cm3The viscosity ratio K2 of the polypropylene/VLDPE mixture to POE is ≥ 30, where K2= MFR (PP + VLDPE)/MFR (POE);
the mineral powder is talcum powder;
the processing oil substitute is an ethoxy lauryl tyramine polyvinyl amine aqueous solution, wherein the concentration of the ethoxy lauryl tyramine is 10-30%, and the concentration of the polyvinyl amine is 10-20%.
2. The good appearance polypropylene composite of resistance to ash pick-up of claim 1 wherein:
the propylene-based elastomer is an ethylene-propylene copolymer, the propylene content is 80-92%, the Shore hardness is less than or equal to 40D under the condition of 15S, and the melt flow rate is 1-50g/10min under the conditions of 230 ℃ and 2.16 Kg;
the particle size of the talcum powder is less than or equal to 10 mu m.
3. The good appearance polypropylene composite of resistance to ash pick-up of claim 1 wherein: the main antioxidant is hindered phenol antioxidant, the melting point is more than or equal to 160 ℃, the molecular weight is more than or equal to 600, the precipitation parameter Y1 is more than or equal to 15, and the precipitation parameter Y1= melting point (unit ℃) multiplied by molecular weight multiplied by 25 ℃ cyclohexane solubility (unit g/100g) multiplied by purity (unit%)/10000;
the auxiliary antioxidant is phosphite antioxidant, the melting point is more than or equal to 160 ℃, the molecular weight is more than or equal to 600, the precipitation parameter Y2 is more than or equal to 15, and the precipitation parameter Y2= melting point (unit ℃) multiplied by molecular weight multiplied by 25 ℃ cyclohexane solubility (unit g/100g) multiplied by purity (unit%)/10000;
the light stabilizer is a hindered amine light stabilizer, the molecular weight of the light stabilizer is more than or equal to 2000, and the appearance of the light stabilizer is granular.
4. The good appearance polypropylene composite of resistance to ash pick-up of claim 1 wherein: the polypropylene is a propylene copolymer, and the Melt Flow Rate (MFR) of the propylene copolymer is 20-120g/10min under the conditions of 230 ℃ and 2.16 Kg;
the dust-proof agent is an antistatic agent glycerol monostearate, and the appearance of the dust-proof agent is granular.
5. A method for preparing the polypropylene composite with good appearance and dust absorption resistance as claimed in any one of claims 1 to 4, which comprises the following steps:
1) adding talcum powder, propenyl elastomer, auxiliary antioxidant and processing oil substitute into an internal mixer or other meshing equipment, uniformly mixing, and then granulating to obtain talcum powder master batch;
2) adding the main antioxidant, the auxiliary antioxidant, the light stabilizer, the processing oil substitute and the propenyl elastomer into an internal mixer or other meshing equipment, uniformly mixing, and then granulating to obtain additive master batches;
3) adding polypropylene, polyethylene, elastomer and talcum powder master batches into a mixing machine, uniformly mixing, then adding a processing oil substitute, continuously mixing, then adding a dust-proof agent and an additive master batch, uniformly mixing, adding into a main feed port of a double-screw extruder, carrying out melt blending, and carrying out vacuum extrusion granulation to obtain the polypropylene composite material with good dust absorption resistance and appearance.
6. The method for preparing a good appearance polypropylene composite with dust absorption resistance according to claim 5, wherein: the talcum powder master batch comprises the following raw materials in parts by weight:
65-85 parts of talcum powder;
15-35 parts of a propylene-based elastomer;
0.2-1 part of auxiliary antioxidant;
0.2-5 parts of processing oil substitute.
7. The method for preparing a good appearance polypropylene composite with dust absorption resistance according to claim 5, wherein: the additive master batch comprises the following raw materials in parts by weight:
5-15 parts of a main antioxidant;
5-15 parts of an auxiliary antioxidant;
5-15 parts of a light stabilizer;
55-85 parts of a propylene-based elastomer;
0.2-2 parts of processing oil substitute.
8. The method for preparing a good appearance polypropylene composite with dust absorption resistance according to claim 5, wherein: the processing temperature of the double-screw extruder is 180-230 ℃, and the vacuum degree is less than or equal to-0.1 MPa.
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