CN103030875B - Modified PP (polypropylene) foaming material and forming method thereof - Google Patents
Modified PP (polypropylene) foaming material and forming method thereof Download PDFInfo
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Abstract
The invention discloses a modified PP (polypropylene) foaming material, which is a blend comprising the following integrants in part by weight: 5-10 parts of ethylene-propylene-diene rubber and 50 parts of polypropylene and low-density polyethylene; and the foaming material further comprises the following components in parts by weight: 0.5 part of crosslinker, 0.2 part of assistant crosslinker divinylbenzene, 3-10 parts of Ac foaming agent, 2 parts of zinc oxide, 0.5 part of stearic acid, 0.05 part of antioxidant and 3-15 parts of inorganic filler. In the forming method, the PP (polypropylene) material is foamed in a forced air drying oven or a plate vulcanizing machine. The foaming difficulty of the PP (polypropylene) material is lowered, the prepared modified PP (polypropylene) foaming material has good elasticity, has the characteristics of weatherability, temperature resistance, ageing-resistant and the like, and can be used for various fields such as package, automobiles, thermal insulation, architecture, buffer cushions, sound absorption and noise reduction and the like.
Description
Technical field
The present invention relates to a kind of foam material and forming method thereof, relate in particular to modified polypropene (PP) foam material and forming method thereof, utilize its good thermotolerance, wholesomeness, thermal insulation and good environmental effect, modified foaming PP can play an important role in fields such as packing, automobile, thermal isolation, buildings.
Background technology
Compare with other polyolefine material, PP has higher rigidity, good mechanical property, good heat-resisting and chemical stability.The thermal conductivity of foaming PP is lower than polyethylene foamed (PE), and heat insulating ability is good, can resistance to boiling water, therefore can be used as senior heat-insulating heat-preserving material.Conventional pure PP is because melt temperature is high, and scope is narrower, and last crosslinked polypropylene is with the rising of temperature, and melt viscosity sharply declines, and the range of viscosities of suitable foaming is extremely narrow, is not easy foaming, enable foaming, but foam material fragility is large, lacks flexibility.
In prior art, useful terpolymer EP rubber (EPDM) or Low Density Polyethylene (LDPE) are prepared foam material after to PP modification, and LDPE chemical stability is outstanding, and as all more stable to acid, alkali, salt, organic solvent, forming process is good.But LDPE and PP consistency are also bad, have influence on the performance of PP/LDPE foam material.EPDM also can carry out modification to PP, and the density very little (0.86～0.87Mg/m3) of EPDM, can fill filler and tenderizer in a large number, and PE is expensive for its cost ratio.
Summary of the invention
The object of the invention is to solve the above-mentioned problems in the prior art, by the method for blending and modifying, prepare a kind of foam material, its foam abscess is even, color and luster even, good springiness.
To achieve these goals, the present invention is achieved in that
A MODIFIED PP foam material, is characterized in that, described foam material is the blend of polypropylene and Low Density Polyethylene and terpolymer EP rubber, and wherein, the parts by weight of terpolymer EP rubber are 5-10, and the gross weight umber of polypropylene and Low Density Polyethylene is 50; Described foam material also comprises 15 parts of 0.5 part of linking agent (as dicumyl peroxide (DCP) or benzoyl peroxide (BPO)), 0.2 part of additional crosslinker (as Vinylstyrene), Ac whipping agent 3-10 part, 2 parts, zinc oxide, 0.5 part of stearic acid, 0.05 part, oxidation inhibitor (as 1010) and mineral filler (as calcium carbonate or mica powder) 3-.
Wherein, PP/LDPE proportioning is variable, and umber ratio is 25:25,20:30,35:15,40:10 or 45:5.PP is that homopolymerization or copolymerization all can.Homopolymerization is as PP225, and copolymerization is as 30RA, or other.
A kind of forming method of above-mentioned MODIFIED PP foam material, concrete steps are as follows: before (1) foaming by polypropylene and Low Density Polyethylene and terpolymer EP rubber according to proportioning blend, then in the mill of 155～160 ℃, plasticate, add gradually linking agent, additional crosslinker, zinc oxide, stearic acid, oxidation inhibitor and mineral filler, finally add whipping agent, play triangle bag 5-7 time, until blend composition mixes, tablet is taken off while hot and flattened; (2) tablet is carried out to premolding in 160 ℃ framed under 5MPa pressure; (3) take and a certain amount ofly through preformed tablet, be placed in mould, put into again the 5min that foams in electric heating constant-temperature blowing drying box at 180～190 ℃ of temperature, or be placed on the 5-10min that foams in vulcanizing press under 180～190 ℃ of temperature and pressure 1～10MPa; Take out mould, take out after cooling foam material.
The present invention is by polyethylene and polypropene blended, improved the elasticity of intermingling material, using the compatilizer of terpolymer EP rubber (EPDM) as PP and PE simultaneously, PP/LDPE can be foamed with arbitrary proportion, reduced the foaming difficulty of PP material, made MODIFIED PP foam abscess is even, and color and luster is even, good springiness.Foam material of the present invention has good elasticity, can be weather-proof, heatproof, the characteristic such as ageing-resistant, can be used for the fields such as packing, automobile, thermal isolation, building, buffer pad, sqouynd absorption lowering noise.
Accompanying drawing explanation
Fig. 1 is foam process schema of the present invention.
Fig. 2 is EPDM content while being fixed as 5 parts, and blending foaming material density is with the variation diagram of PP:LDPE proportioning.
Fig. 3 is EPDM content while being fixed as 5 parts, and blending foaming material tensile strength is with the variation diagram of PP:LDPE proportioning.
Fig. 4 is EPDM content while being fixed as 5 parts, and blending foaming material tear strength is with the variation diagram of PP:LDPE proportioning.
Fig. 5 is EPDM content while being fixed as 5 parts, and blending foaming material elongation at break is with the variation diagram of PP:LDPE proportioning.
Embodiment
Umber of the present invention is weight part.
embodiment 1
table 1 main raw material
| Raw material | The trade mark | Manufacturer |
| Polypropylene (PP) | EPS30RA | Qilu Petrochemical |
| Low Density Polyethylene (LDPE) | 2102TN26 | Raise sub-petrochemical industry |
| EPDM | - | U.S. Dao Er chemical company |
| AC whipping agent | Dn6 | Jiangsu Suo Pu company limited |
| BPO | Analytical pure | Chemical Reagent Co., Ltd., Sinopharm Group |
| Vinylstyrene | Analytical pure | Chemical Reagent Co., Ltd., Sinopharm Group |
| Zinc oxide | Analytical pure | Chemical Reagent Co., Ltd., Sinopharm Group |
| Stearic acid | Analytical pure | Chemical Reagent Co., Ltd., Sinopharm Group |
| Antioxidant 1010 | Technical grade | Nanjing Yangzi fine chemistry industry limited liability company |
The present invention's equipment used is in Table 2.
table 2 major equipment
| Title | Model | The place of production |
| High-speed mixer (MAX8000 rev/min) | ZRH-10 type | Fuxin City light industry mechanical & electrical equipment factory, Liaoning |
| Electric heating constant-temperature blowing drying box | DHG-9140A type | The grand experimental installation of upper Nereid company limited |
| Electronic balance | JY10001 type | The flat instrument of upper current chart company limited |
| Equidirectional parallel double-screw extruder | SHJ-35 type | Nanjing Guang Da rubber and plastics machine factory |
| Electronic type universal trier | WDT30 | Shenzhen Kai Qiangli test apparatus company limited |
each district's temperature of table 3 twin screw extruder
| One district | 2nd district | 3rd district | 4th district | 5th district |
| 150℃ | 155℃ | 170℃ | 180℃ | 180℃ |
| 6th district | 7th district | 8th district | 9th district | Head |
| 180℃ | 180℃ | 180℃ | 190℃ | 185℃ |
Foaming formulation is, when the total amount of Co-polypropylene (PP EPS30RA) is 25 parts, also contain: 25 parts of Low Density Polyethylenes (LDPE), 6 parts of terpolymer EP rubbers (EPDM), 0.5 part of linking agent benzoyl peroxide (BPO), 0.2 part of additional crosslinker Vinylstyrene, 6 parts of Ac whipping agents, 2 parts, zinc oxide, 0.5 part of stearic acid, antioxidant 1010 is with 0.05 part, 5 parts, mineral filler calcium carbonate.
Technique: before foaming, PP, LDPE, EPDM etc. are mixed on high-speed mixer according to proportioning, then compound is passed through to twin screw extruder extruding pelletization, each district's temperature of twin screw extruder arranges in Table 3, in air dry oven, 89 ℃ of dry 8h then plasticate dried blend composition in the mill of 155 ℃, add gradually other auxiliary agent, finally add whipping agent, play triangle bag 5-7 time, until blend composition mixes, tablet is taken off while hot and flattened.Tablet is carried out to premolding with 5MPa pressure in 160 ℃ framed.Foaming is free foaming in baking oven, takes a certain amount of electric heating constant-temperature blowing drying box 5min that foams at 190 ℃ of temperature that puts into after preformed sheet stock.Take out foam material.Recording MODIFIED PP foam density is 0.2g/cm
3, tear strength is 25N/mm.
embodiment 2
The foaming of MODIFIED PP in vulcanizing press, main raw material is in Table 1.
Foaming formulation is 20 parts of homo-polypropylene (PP 225), 30 parts of Low Density Polyethylenes (LDPE), 5 parts of terpolymer EP rubbers (EPDM), 0.5 part of linking agent diphenyl peroxide propyl benzene (DCP), 0.2 part of additional crosslinker Vinylstyrene, 4 parts of Ac whipping agents, 2 parts, zinc oxide, 0.5 part of stearic acid, antioxidant 1010 is with 0.05 part, 3 parts, mineral filler calcium carbonate.
Technique: foaming before by PP, LDPE, EPDM etc. according to proportioning blend, then in the mill of 155 ℃, plasticate, add gradually other auxiliary agent (linking agent diphenyl peroxide propyl benzene (DCP), additional crosslinker Vinylstyrene, zinc oxide, stearic acid, antioxidant 1010, mineral filler calcium carbonate), finally add whipping agent, play triangle bag 5-7 time, until blend composition mixes, tablet is taken off while hot and flattened.Tablet is carried out to premolding with 5MPa pressure in 160 ℃ framed.
Foaming is to foam on vulcanizing press, takes a certain amount of mould of putting into and be placed on vulcanizing press after preformed sheet stock, and the 5min that foams at 2MPa, 190 ℃ of temperature, takes out foam material.Test various mechanical properties, density is pressed GB/T 6342) 1995 tests, density is 0.32g/cm
3; Tear strength is pressed GB/T 529) 1999 tests, tear strength is 2.9N/mm; Tensile strength and elongation at break are pressed GB/T 528) 1998 tests.
Claims (2)
1. the forming method of a MODIFIED PP foam material, it is characterized in that, foam material is the blend of polypropylene and Low Density Polyethylene and terpolymer EP rubber, wherein, the parts by weight of terpolymer EP rubber are 5-10, and the gross weight umber of polypropylene and Low Density Polyethylene is 50, described foam material also comprises 0.5 part of linking agent, 0.2 part of additional crosslinker, Ac whipping agent 3-10 part, 2 parts, zinc oxide, 0.5 part of stearic acid, 0.05 part, oxidation inhibitor and mineral filler 3-15 part, concrete steps are as follows: before (1) foaming by polypropylene and Low Density Polyethylene and terpolymer EP rubber according to proportioning blend, then in the mill of 155～160 ℃, plasticate, add gradually linking agent, additional crosslinker, zinc oxide, stearic acid, oxidation inhibitor and mineral filler, finally add whipping agent, play triangle bag 5-7 time, until blend composition mixes, tablet is taken off while hot and flattened,
(2) tablet is carried out to premolding with 5MPa pressure in 160 ℃ framed;
(3) take through preformed tablet and be placed in mould, put into again electric heating constant-temperature blowing drying box free foaming 5min at 180～190 ℃ of temperature, or be placed on vulcanizing press with after moulded from foam 5-10min under 180～190 ℃ of temperature and pressure 1～10MPa, take out mould, take out after cooling tablet, obtain foam material.
2. the forming method of a kind of MODIFIED PP foam material according to claim 1, is characterized in that, the parts by weight ratio of described polypropylene and Low Density Polyethylene is 25:25,20:30,35:15,40:10 or 45:5.
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| CN114181461A (en) * | 2021-12-20 | 2022-03-15 | 东莞市通元高分子材料科技有限公司 | Propylene-based elastomer foam material and preparation method thereof |
| CN116082691A (en) * | 2022-12-09 | 2023-05-09 | 胜利油田东润机械工程有限责任公司 | Foaming agent for polypropylene foaming, modified polypropylene foaming material and preparation method |
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| DE19531631A1 (en) * | 1995-08-28 | 1997-03-06 | Tramaco Gmbh | Prodn. of thermoplastic foam with syntactic foam structure |
| CN102532647B (en) * | 2010-12-27 | 2014-06-04 | 上海杰事杰新材料(集团)股份有限公司 | Photo-biological composite degradable polyethylene foam plastic and preparation method thereof |
| CN102311575A (en) * | 2011-09-15 | 2012-01-11 | 华侨大学 | PP foaming composite additive |
| CN102604210B (en) * | 2012-02-27 | 2013-08-21 | 河北华强科技开发有限公司 | Degradable polypropylene foam composite material and preparation method thereof |
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Effective date of registration: 20201105 Address after: Fengli town Xinjian West Road, Rudong County, Nantong City, Jiangsu Province 226400 Patentee after: Rudong Wenyuan investment and Development Co., Ltd Address before: Gehu Lake Road Wujin District 213164 Jiangsu city of Changzhou province No. 1 Patentee before: CHANGZHOU University |
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