CN109265825A - A kind of polypropylene or polypropylene composite foaming product and preparation method thereof - Google Patents

A kind of polypropylene or polypropylene composite foaming product and preparation method thereof Download PDF

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CN109265825A
CN109265825A CN201811040415.6A CN201811040415A CN109265825A CN 109265825 A CN109265825 A CN 109265825A CN 201811040415 A CN201811040415 A CN 201811040415A CN 109265825 A CN109265825 A CN 109265825A
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polypropylene
foaming
product
injection
foaming product
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CN109265825B (en
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周应国
谭啸天
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Jiangsu University of Science and Technology
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Jiangsu University of Science and Technology
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    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08JWORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J9/00Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
    • C08J9/04Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent
    • C08J9/06Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a chemical blowing agent
    • C08J9/10Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a chemical blowing agent developing nitrogen, the blowing agent being a compound containing a nitrogen-to-nitrogen bond
    • C08J9/102Azo-compounds
    • C08J9/103Azodicarbonamide
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    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08JWORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J9/00Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
    • C08J9/0061Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof characterized by the use of several polymeric components
    • CCHEMISTRY; METALLURGY
    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08JWORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J9/00Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
    • C08J9/0066Use of inorganic compounding ingredients
    • C08J9/0071Nanosized fillers, i.e. having at least one dimension below 100 nanometers
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    • C08JWORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J9/00Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
    • C08J9/04Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent
    • C08J9/12Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a physical blowing agent
    • C08J9/122Hydrogen, oxygen, CO2, nitrogen or noble gases
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    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08JWORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J9/00Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
    • C08J9/04Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent
    • C08J9/12Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a physical blowing agent
    • C08J9/125Water, e.g. hydrated salts
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    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08JWORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2203/00Foams characterized by the expanding agent
    • C08J2203/04N2 releasing, ex azodicarbonamide or nitroso compound
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    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08JWORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2203/00Foams characterized by the expanding agent
    • C08J2203/06CO2, N2 or noble gases
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    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08JWORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2203/00Foams characterized by the expanding agent
    • C08J2203/08Supercritical fluid
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    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08JWORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2203/00Foams characterized by the expanding agent
    • C08J2203/10Water or water-releasing compounds
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    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08JWORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2323/00Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
    • C08J2323/02Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
    • C08J2323/10Homopolymers or copolymers of propene
    • C08J2323/12Polypropene
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    • C08J2423/00Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
    • C08J2423/02Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
    • C08J2423/04Homopolymers or copolymers of ethene
    • C08J2423/06Polyethene
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    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08KUse of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00Use of inorganic substances as compounding ingredients
    • C08K3/18Oxygen-containing compounds, e.g. metal carbonyls
    • C08K3/20Oxides; Hydroxides
    • C08K3/22Oxides; Hydroxides of metals
    • C08K2003/2237Oxides; Hydroxides of metals of titanium
    • C08K2003/2241Titanium dioxide
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    • C08KUse of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K2201/00Specific properties of additives
    • C08K2201/011Nanostructured additives
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    • C08ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08KUse of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00Use of inorganic substances as compounding ingredients
    • C08K3/34Silicon-containing compounds
    • C08K3/36Silica

Abstract

The invention discloses a kind of polypropylene or polypropylene composite foaming products, also disclose the preparation method of above-mentioned polypropylene or polypropylene composite foaming product, polypropylene cold drawn fibers are added to polypropylene by a certain percentage or it is blended in material, polypropylene or polypropylene composite foaming product with specific orientation micropore are made using any one mode in Water blown injection, chemical blowing injection, supercritical fluid foaming injection or chemical blowing/supercritical fluid foaming composite injection.The method of the present invention is applied widely, can both produce in normal injection machine, can also produce in super-critical fluid injection machine;It is significantly increased in terms of product tensile strength and elongation at break using foaming product made from this method compared to similar foaming injection product.

Description

A kind of polypropylene or polypropylene composite foaming product and preparation method thereof
Technical field
The present invention relates to a kind of polypropylene or the foaming product of polypropylene composite, the invention further relates to above-mentioned polypropylene or The preparation method of polypropylene composite foaming product belongs to polymer material technical field.
Background technique
In recent years, because sound insulation, damping, it is heat-insulated, save raw material the advantages that, polymer foaming product is in packaging, building, automobile It is widely used in the industries such as industry, space flight and aviation and sports equipment.Wherein polymer foaming injected articles are because of production adaptation Property it is strong, high-efficient, be easily operated automatically, the features such as shrink of product amount of warpage is few, is increasingly taken seriously.In general, foaming product Internal abscess is to be generated in forming process by plastic raw materials or added certain gases outside and formed.It is formed and is sent out according to abscess The difference of infusion type, it may include chemical blowing, physical blowing and mechanical mixture foaming etc. are come by the processing method of foaming product See also mainly there is intermittent, continuous extrusion molding and injection moulding, this few class method respectively has advantage and disadvantage, thus there are different journeys The application of degree.
But, usually there is larger difference in the mechanical property of foaming product, be by abscess ruler in this widely different degree The influence of the structure parameters such as very little, density, distribution and form, the control of cell morphology and distribution is the most difficult and complicated among these, From the point of view of this is with widely used PP foam material, polypropylene category Crystalline plastics hardly flow below crystalline melt point Dynamic, the gas core of formation is difficult to grow up, meanwhile, then melt viscosity sharply becomes smaller on crystalline melt point, and melt strength is very low, foaming Gas easily escape again.Improving melt strength, the escape for reducing foamed gas, improving the nucleation rate of material is always polypropylene hair Brewage problem to be solved.Meanwhile being compared with similar solid article, often there is tensile strength drop in polypropylene expanded product The case where low and elongation at break is greatly decreased is widely believed that the abscess of polymer micro product is spherical shape or close to ball at present The form of shape seldom considers cell morphology regulation to the form for being more advantageous to product properties raising.
Therefore the exploitation for the foaming method that one kind can greatly improve polypropylene and its blend foaming product performance has very much must It wants.Document (Ying-Guo Zhou, Bei Su, Hai-Hong Wu.Effect of Cold-drawn Fibers on the Self-reinforcement of the PP/LDPE Composites[J].Journal of Materials Engineering and Performance, 2017,26 (8), 4072-4082.) polypropylene or its compound are had studied at it Stretched below heat distortion temperature to form cold drawn fibers, this cold drawn fibers can be than original polypropylene or its compound With more stable composite nalysis.It is contemplated by the invention that the addition of this cold drawn fibers may be brought to the foaming of material with Lower effect: a kind of " semi-molten " state is in subsequent heating melting, that is to say, that part of it microfilament is incomplete Melting, so final consequence of bring is, a part of microfilament can serve as heterogeneous nucleation agent use in foaming process, can also be with Promote melt strength causes to steep in addition, it can accelerate polypropylene or the crystallization process of its compound in material cooling procedure The locking in advance in hole, makes gas be not easy to escape, meanwhile, during injection molding process, its meeting streamwise is orientated, then It can induce the variation of micro pore shape structure in subsequent foaming.It is above-mentioned various sending out for polypropylene or its compound to can be improved Whether bubble property, but, the above imagination are only theoretic analysis, effective in practice, need further to be verified.
Summary of the invention
Goal of the invention: technical problem to be solved by the invention is to provide the foaming of a kind of polypropylene or polypropylene composite Product, due to having inside the foaming product and Impact direction (flow direction) consistent micropore, with good drawing Stretch intensity and elongation at break.
The present invention also technical problems to be solved are to provide the system of above-mentioned polypropylene or polypropylene composite foaming product agent Preparation Method, the method for the present invention is applied widely, can both produce in normal injection machine, can also be in super-critical fluid injection machine Middle production, simple process when being produced in normal injection molding machine, easy to operate, the change without any apparatus;And it adopts The foaming product made from this method is compared to similar fretting map injected articles in terms of product tensile strength and elongation at break It is significantly increased.
Summary of the invention: in order to solve the above technical problems, the technical scheme adopted by the invention is as follows:
A kind of polypropylene or polypropylene composite foaming product, micropore is arranged in specific orientation in the foaming product, The specific orientation is that micropore is parallel to each other with flow direction.
The preparation method of above-mentioned polypropylene or polypropylene composite foaming product, by a certain percentage by polypropylene cold drawn fibers It is added to polypropylene or it is blended in material, using Water blown injection, chemical blowing injection, supercritical fluid foaming injection or change One of foaming/supercritical fluid foaming composite injection mode is learned the polypropylene with specific orientation micropore is made or gathers Polypropylene composition foaming product.
Wherein, the polypropylene cold drawn fibers are prepared with the following method: by polypropylene below its crystallization temperature 500%~800% is stretched, the material segment after stretching is cut as particle;Wherein, the length of particle be 3~15mm, width 1 ~4mm, with a thickness of 0.5~1.5mm.
Further preferably, the preparation method of above-mentioned polypropylene or polypropylene composite foaming product specifically includes following step It is rapid:
Step 1, polypropylene is stretched to 500%~800% below its crystallization temperature, is by the material segment cutting after stretching Particle;Wherein, the length of particle is 3~15mm, width is 1~4mm, with a thickness of 0.5~1.5mm;Polypropylene is for homopolymerization or altogether Dimerization product, melt flow rate (MFR) are 1~20g/10min (230 DEG C, 21.6N), and melting temperature is 160~166 DEG C, are broken Splitting elongation is more than 500%;
Step 2, particle is added to polypropylene by the 5~50% of mixed material gross mass or it is blended in material, mixing Mixed material is prepared into after uniformly;Polypropylene in step 2 and the polypropylene (in step 1) for preparing cold drawn fibers are of the same race or different Kind, but in order to guarantee in normal injection machine can foaming injection, the polypropylene melt flow rate in step 2 is unsuitable excessively high, For 1~50g/10min (230 DEG C, 21.6N);It can be high density polyethylene (HDPE), low-density that other intermingling materials in material, which are blended, One or more of polyethylene or linear low density polyethylene, i.e., by high density polyethylene (HDPE), low density polyethylene (LDPE) or linear low One or more of density polyethylene is added among polypropylene as intermingling material, and the additional amount of intermingling material accounts for all mixed The 0%~50% of material gross mass is closed, the Ldpe Melt flow rate that the present invention uses is 1~20g/10min (190 DEG C, 21.6kg), high density polyethylene (HDPE) melt flow rate (MFR) are 7.6g/10min (190 DEG C, 21.6kg);
Step 3, mixed material is put into injection (mo(u)lding) machine, there is specific orientation by the effect production of proper amount of gas The foaming product of property micropore;Wherein, the temperature of melt is 166~172 DEG C in injection (mo(u)lding) machine;Wherein, the gas in step 3 is Chemical blowing master batch decompose or supercritical fluid decompression transformation one or both of the compound obtained gas of form, or for water by The gas thermally decomposed to yield.
Further preferably, the method for preparing foaming product using polypropylene cold drawn fibers combination chemical blowing injection, specifically Include the following steps:
Step 1, foaming agent, blowing promotor, nucleating agent, dispersing agent and the vector resin after drying are mixed in a certain ratio Foaming concentrate is obtained by extrusion mechanism afterwards;
Step 2, polypropylene is stretched to 500%~800% below its crystallization temperature, is by the material segment cutting after stretching Particle;Wherein, the length of particle is 3~15mm, width is 1~4mm, with a thickness of 0.5~1.5mm;
Step 3, particle is added to polypropylene in 5~50% ratios of mixed material gross mass or it is blended in material, And foaming concentrate made from step 1 is added by a certain percentage, the quality accounting of foaming agent effective component is in foaming concentrate 0.4%~1.0%, mixed material is obtained after mixing;
Step 4, mixed material is put into injector, wherein the temperature of melt is 166~172 DEG C in injector.
Wherein, in step 1, the foaming concentrate is grouped as by the group of following mass fraction: 10~30 parts of foaming agents, 4~8 Part dispersing agent, 5~10 portions of nucleating agents and 50~80 parts of vector resins;Wherein, the additional amount of blowing promotor is foaming agent quality 10.5~11.3%;Foaming agent is azodicarbonamide;Blowing promotor is that zinc oxide or the one or two kinds of of barium monoxide mix It closes;Dispersing agent is PE wax;Nucleating agent is nano-titanium dioxide or nano silica;Vector resin is polyethylene;Chemistry hair The decomposition temperature for steeping masterbatch is 130~160 DEG C, is temperature between 120~125 DEG C in the temperature setting of extruder in extrusion process Height is spent, foaming agent may decompose in advance, and temperature is too low, be unfavorable for being plasticized.
Further preferably, the method for preparing foaming product using polypropylene cold drawn fibers combination Water blown injection is specific to wrap Include following steps:
Step 1, polypropylene is stretched to 500%~800% below its crystallization temperature, is by the material segment cutting after stretching Particle;Wherein, the length of particle is 3~15mm, width is 1~4mm, with a thickness of 0.5~1.5mm;
Step 2, carrier is made by plastic extruder after the desired amount of active carbon and polypropylene and its blend being mixed Material;Active carbon accounts for the 0.5~1.0% of entire carrier material quality;
Step 3, suitable water is dispersed in carrier material made from step 2, forms aqueous mixture material;It uses Water be distilled water, the quality that water is added is the 0.8~1.5% of entire aqueous mixture material quality, in water added with sodium chloride, One or more of the inorganic matters such as calcium chloride or manganese chloride are soluble in water and become nucleating agent, and the usage amount of nucleating agent is water use The 0.5%~2% of amount;
Step 4, by 5~50% aqueous mixture material for being added to step 3 by mass percentage of particle made from step 1 In, mixed material is obtained after mixing;
Step 5, mixed material is put into injector, wherein the temperature of melt is 166~172 DEG C in injector.
Further preferably, the side of foaming product is prepared using polypropylene cold drawn fibers combination supercritical fluid foaming injection Method specifically comprises the following steps:
Step 1, polypropylene is stretched to 500%~800% below its crystallization temperature, is by the material segment cutting after stretching Particle;Wherein, the length of particle is 3~15mm, width is 1~4mm, with a thickness of 0.5~1.5mm;
Step 2, particle made from step 1 is added to polypropylene or its blending by the 5~50% of mixed material gross mass In material, mixed material is obtained after mixing;
Step 3, mixed material is put into the injection (mo(u)lding) machine with injection apparatus for supercritical fluid, in specific work The foaming product with specific orientation micropore is made in (specific melt temperature) under the conditions of skill;Wherein, it is melted in injection (mo(u)lding) machine Temperature is 166~172 DEG C;Supercritical fluid is one or two kinds of compound, injections of supercritical nitrogen or carbon dioxide Amount is the 0.3~1.0% of foaming product quality.
If preparing hair using polypropylene cold drawn fibers combination chemical blowing/supercritical fluid foaming composite injection mode Foaming concentrate is added in brewage in step 2 above, then the dosage of supercritical fluid can be according to foaming concentrate in step 3 Additional amount 2~4% is adjusted, so that the dosage of both foaming concentrate effective component and supercritical fluid be made to control respectively Between 0.4~1.0% and 0.3~1.0%.
The principle of preparation method of the present invention are as follows: polypropylene cold drawn fibers have more stable heating power than original polypropylene Structure is learned, in subsequent heating melting, because limiting heating temperature, within 172 degree, polypropylene cold drawn fibers are located substantially In a kind of " semi-molten " state, that is to say, that part of it microfilament does not melt completely, this part of microfilament is in foaming process Heterogeneous nucleation agent use can be served as, melt strength is also promoted on a small quantity, in addition, it can accelerate poly- third in material cooling procedure The crystallization process of alkene or its compound leads to the locking in advance of abscess, gas is made to be not easy to escape, meanwhile, in injection molding process process In, abscess meeting streamwise (flow direction during melt injection molding process) is orientated, then can in subsequent foaming Induce the variation of microcellular structure.Because the orientation (abscess is consistent with flow direction) that abscess streamwise occurs, and can be with This orientation is fixed up.The draw direction of product and the differently- oriented directivity of abscess are parallel, thus cause its mechanical property substantially It improves, the micropore streamwise orientation of product can make it, and each hole is easier mutual connection during stretching, to show Occur a branch of bundle fiber quickly out stretching, thus thin neck when its stretching is easier to extend, and it is very high to show elongation at break.
Compared with the prior art, technical solution of the present invention has the beneficial effect that
It is micro- that the method for the present invention can prepare polypropylene or polypropylene composite of the streamwise with orientation abscess Hole product, the based article each abscess when stretching along micropore differently- oriented directivity is easier to be interconnected, so that foaming product table Reveal high elongation at break, the elongation at break of foaming product produced by the present invention is 500% or more, compared to common For foaming injection product, foaming product mechanical property of the present invention is greatly improved, and tensile strength effectively increases 15% or more, Ductility is at 3 times or more of common foaming injection product;The method of the present invention is applied widely, both can be in normal injection machine Middle production can also produce in super-critical fluid injection machine, simple process when producing in normal injection molding machine, operation side Just, the change without any apparatus;Several foaming injection methods used in method influence whether finally to send out without any The residue of brewage performance;Method use cold drawn fibers also come from polypropylene material, it and for processing polypropylene material The problem of material is without compatible difference, thus seem simple and be easy to implement.
Detailed description of the invention
Fig. 1 is the process flow chart of foaming product of the present invention;
Fig. 2 is the implementation process figure of preparation method of the present invention;
Fig. 3 is that embodiment 1 is obtained perpendicular to length direction (longitudinal direction of Fig. 2 Plays tensile bars is length direction) Foaming product cell morphology scanning electron microscope (SEM) photograph;
Fig. 4 is the cell morphology scanning electron microscope (SEM) photograph that the foaming product of length direction is parallel to made from embodiment 1;
Fig. 5 is the cell morphology scanning electron microscope (SEM) photograph of the foaming product obtained perpendicular to length direction of comparative example 1;
Fig. 6 is the cell morphology scanning electron microscope (SEM) photograph that the foaming product of length direction is parallel to made from comparative example 1.
Specific embodiment
Technical solution of the present invention is described further combined with specific embodiments below.
The process flow of preparation method of the present invention is as shown in Figure 1.In terms of raw material, the polypropylene (PP) used is domestic T30S, melt flow index are that 3.2g/10min (230 DEG C, 21.6N) low density polyethylene (LDPE) (LDPE) is domestic 951-000, Its melt flow index is 2.18g/10min, and high density polyethylene (HDPE) (HDPE) is platform modeling 8008, and melt flow index is 7.6g/10min (190 DEG C, 2.16kg), the high temperature AC foaming agent used are commercially available Dn8 type, and average grain diameter is 6~8 μm, Completely decompose generate tolerance be more than 220ml/g, by differential scanning calorimetry the heating rate of 10 DEG C/min test-strips Under part, decomposing initial temperature is 192.2 DEG C, and decomposing peak value is 217.2 DEG C.The other auxiliary agents used are commercially available, wherein hair It steeps auxiliary agent and uses ZnO, the partial size of nano-titanium dioxide and nano silica etc. uses high-melting-point PE within 100 nanometers For wax as dispersing agent, fusing point is about 105 DEG C.In Fig. 2, it is along the longitudinal direction the length direction of product that e, which is the shape of product,.
Embodiment 1
The present embodiment is to generate gas using chemical blowing masterbatch and then regulate and control polypropylene and its blend foaming note Penetrate the cell morphology of product.Its concrete implementation path needs a common injector and squeezes as shown in Fig. 2, equipment aspect Machine out, injector can be hydraulic drive, all-electric or electro-hydraulic joint, which uses without installing self-locking nozzle additional Mold is standard tensile batten, and the extruder for raw material mixing can be single screw rod or double-screw type.
The method for preparing foaming product using polypropylene cold drawn fibers combination chemical blowing injection, specifically includes following step It is rapid:
Step 1, it manufactures foaming concentrate: weighing raw material according to following quality: LDPE:0.7995kg, AC:0.1kg, ZnO: 0.0105kg, high-melting-point PE wax: 0.04kg, nano-titanium dioxide: 0.05kg;After raw material is separately dried, mixed in kneading machine Uniformly and by double screw extruder foaming concentrate is made in conjunction, and melt temperature is 120 DEG C of (chemical blowing mothers in extrusion process The decomposition temperature of material is 130~160 DEG C, and 120 degree of melt temperature lower than decomposition temperature to decompose to avoid chemical blowing masterbatch);
Step 2, polypropylene cold drawn fibers are prepared: polypropylene is put into injector, under room temperature environment stretch 700%~ 800%, the material segment after stretching is cut into the polypropylene cold drawing particle for length in 3mm, width about 1mm, thickness about 0.5mm;
Step 3, weigh raw material polypropylene: 5.4KG, polypropylene cold drawing particle: 4KG, foaming concentrate: 0.6KG is uniformly mixed After be prepared into mixed material;
Step 4, mixed material is put into normal injection machine and processes product;The wherein melt temperature setting of injector Between 166~172 degrees Celsius.
Finally, carrying out tensile property test to obtained polypropylene microporous product, test result is shown in Table 1.
In order to be illustrated to effect of the invention, comparative example 1, the preparation process and embodiment of raw material are listed 1 is similar, and the preparation method of comparative example 1 is not compared with Example 1 that polypropylene cold drawing is not added in step 2 simultaneously step 3 Particle, by polypropylene microporous product obtained by comparative example 1 carry out tensile property test, test result be also found in table 1 it In.It is swept in addition, choosing vertical and flow direction in intermediate equivalent locations to the sample of embodiment 1 and comparative example 1 respectively Electronic Speculum (SEM) characterization is retouched, result is respectively as shown in Fig. 3,4,5,6.Wherein, Fig. 3 and Fig. 5 is perpendicular to standard shown in Fig. 2 Resulting section abscess pattern SEM is as a result, Fig. 4 and Fig. 6 are then to be parallel to length direction to take after the sampling of tensile bars length direction Resulting section abscess pattern SEM after sample as a result, and Fig. 3 and Fig. 4 are taken from 1 resulting product of embodiment, Fig. 5 and Fig. 6 are the same as coming from In 1 resulting product of comparative example.From the comparison of Fig. 3 and Fig. 5, it become apparent that, the product internal capillary quantity that Fig. 3 is shown is more And pore size is small, also more uniformly, and Fig. 5 is the foam structure of comparative example 1 for the distribution of micropore, and quantity is few, size Greatly, distribution of cells difference is also big, because the reason of sampling direction, the hole shown in Fig. 3 and Fig. 5 is circle, but actual product In hole and be not all spherical, this can be supplemented from the result of Fig. 4 and Fig. 6, and the comparison from Fig. 4 and Fig. 6 can Out, the hole in Fig. 4 has more obvious directionality (orientation), and this directionality is the stream with melt in mold cavity Dynamic direction is consistent, and ellipsoid is more presented in this some holes, and compares with the result in Fig. 6, they are more elongated, and Fig. 6 In ellipsoid it is more more round, the micropore of Fig. 6 is also without apparent orientation.
It can be seen that microporous foam made from the method for the present invention as Fig. 3,4 and Fig. 5,6 comparison and the data of table 1 Product can very easily be made in normal injection machine, meanwhile, the foam structure of the based article is uniform, abscess streamwise With extremely strong orientation (consistent with flow direction of the melt in mold cavity), the tensile strength of product promoted 17% with On, 5 times of conventional PP solid articles shown with comparative example 11 that ductility even more reaches conventional PP foaming product are compared, and are drawn Stretching intensity and elongation at break is more than conventional PP solid article, to show apparent application prospect.
Embodiment 2
The present embodiment is to generate gas using chemical blowing masterbatch and then regulate and control polypropylene and its blend foaming note Penetrate the cell morphology of product.Equipment aspect, needs common an injector and extruder, injector can be hydraulic drive, All-electric or electro-hydraulic joint, for the injector without installing self-locking nozzle additional, the mold used is standard tensile batten, is used for raw material Mixed extruder can be single screw rod or double-screw type.
The method for preparing foaming product using polypropylene cold drawn fibers combination chemical blowing injection, specifically includes following step It is rapid:
Firstly, manufacture foaming concentrate: raw material is weighed according to following quality: LDPE:0.4861kg, AC:0.3kg, ZnO: 0.0339kg, high-melting-point PE wax: 0.08kg, nano silica: 0.1kg;After raw material is separately dried, mixed in kneading machine Foaming concentrate uniformly and by double screw extruder is made, melt temperature is 125 DEG C in extrusion process;
Secondly, preparing polypropylene cold drawn fibers: polypropylene is put into injector, under room temperature environment stretch 700%~ 800%, the material segment after stretching is cut into the polypropylene cold drawing particle for length in 15mm, width about 4mm, thickness about 1.5mm;
Then, weigh raw material polypropylene: 27.5KG, polypropylene cold drawing particle: 1.5KG, foaming concentrate: 1KG is uniformly mixed After be prepared into mixed material;
Later, mixed material is put into normal injection machine and processes product;The wherein melt temperature setting of injector Between 166~172 degrees Celsius.
Finally, carrying out tensile property test to obtained polypropylene microporous product, test result is shown in Table 1.
In order to be illustrated to effect of the invention, comparative example 2, the preparation process and reality of raw material are in addition listed It is similar to apply example 2, but polypropylene cold drawing particle is not added, polypropylene microporous product obtained by comparative example 2 is stretched Performance test, test result are also found among table 1.Although past by the preparation method that the data of table 1 can be seen that embodiment 2 The polypropylene cold drawing particle that is added in mixed material is simultaneously few, but is also obviously improved to the performance of microporous article.
Embodiment 3
The present embodiment is to use water as foaming agent by thermal decomposition to generate gas and then regulation polypropylene and its blending The cell morphology of object foaming injection product.Equipment aspect, needs common an injector and extruder, and injector can be liquid Pressure transmission, all-electric or electro-hydraulic joint, for the injector without installing self-locking nozzle additional, the mold used is standard tensile batten, Extruder for raw material mixing can be single screw rod or double-screw type.
The method for preparing foaming product using polypropylene cold drawn fibers combination Water blown injection, specifically comprises the following steps:
Firstly, preparing polypropylene cold drawn fibers: polypropylene is put into injector, under room temperature environment stretch 700%~ 800%, the material segment after stretching is cut into the polypropylene cold drawing particle for length in 10mm, width about 2mm, thickness about 1mm;
Secondly, manufacture carrier material: passing through common plastics extruder after active carbon and polypropylene and its blend are mixed Carrier material is made;Active carbon accounts for the 0.5% of entire carrier material gross mass;
Later, it forms mixed material: the distilled water for being added to 0.5% sodium chloride of mass percentage is dispersed in step In carrier master batch obtained by rapid 1, aqueous mixture material is formed, wherein the mass content of water is entire aqueous mixture material 0.8~1.5%, polypropylene cold drawing particle is added in aqueous mixture material in the ratio of mixed material quality 20%, is mixed Mixed material is prepared into after uniformly;
After again, fabricated product: mixed material is put into normal injection machine and processes product;The wherein melt of injector Temperature setting is between 166~172 degrees Celsius.
Finally, carrying out tensile property test to obtained polypropylene microporous product, test result is shown in Table 1.
In order to be illustrated to effect of the invention, comparative example 3, the preparation process and reality of raw material are in addition listed It is similar to apply example 3, but polypropylene cold drawing particle is not added, polypropylene microporous product obtained by comparative example 3 is stretched Performance test, test result are also found among table 1.It can be seen that by the data of table 1 and joined 20% polypropylene cold drawing particle The tensile strength of resulting foaming product and elongation at break are greatly improved afterwards.
Embodiment 4
The present embodiment is to use water as foaming agent by thermal decomposition to generate gas and then regulation polypropylene and its blending The cell morphology of object foaming injection product.Equipment aspect, needs common an injector and extruder, and injector can be liquid Pressure transmission, all-electric or electro-hydraulic joint, for the injector without installing self-locking nozzle additional, the mold used is standard tensile batten, Extruder for raw material mixing can be single screw rod or double-screw type.
The method for preparing foaming product using polypropylene cold drawn fibers combination Water blown injection, specifically comprises the following steps:
Firstly, preparing polypropylene cold drawn fibers: polypropylene is put into injector, under room temperature environment stretch 700%~ 800%, the material segment after stretching is cut into the polypropylene cold drawing particle for length in 10mm, width about 2mm, thickness about 1mm;
Secondly, manufacture carrier material: passing through common plastics extruder after active carbon and polypropylene and its blend are mixed Carrier material is made;Active carbon accounts for the 1.0% of entire carrier material gross mass;
Later, it forms mixed material: the distilled water for being added to 2.0% sodium chloride of mass percentage is dispersed in step In carrier master batch obtained by rapid 1, aqueous mixture material is formed, wherein the mass content of water is entire aqueous mixture material 1.5%, polypropylene cold drawing particle is added in aqueous mixture material in the ratio of mixed material quality 30%, after mixing It is prepared into mixed material;
After again, fabricated product.Mixed material is put into normal injection machine and processes product;The wherein melt of injector Temperature setting is between 166~172 degrees Celsius.
Finally, carrying out tensile property test to obtained polypropylene microporous product, test result is shown in Table 1.
In order to be illustrated to effect of the invention, comparative example 4, the preparation process and reality of raw material are in addition listed It is similar to apply example 4, but polypropylene cold drawing particle is not added, polypropylene microporous product obtained by comparative example 4 is stretched Performance test, test result are also found among table 1.It can be seen that by the data of table 1 and joined 30% polypropylene cold drawing particle The tensile strength of resulting foaming product and elongation at break are greatly improved afterwards.
Embodiment 5
The present embodiment is to regulate and control polypropylene and its blend foaming injection product as foaming agent using supercritical fluid Cell morphology.Equipment aspect needs the injector with supercritical fluid function of injecting (for example, commercialized MUCELL fretting map injection (mo(u)lding) machine) and common extruder, the mold used is standard tensile batten, for raw material mixing Extruder can be single screw rod or double-screw type.
The method for preparing foaming product using polypropylene cold drawn fibers combination supercritical fluid foaming injection, specifically include as Lower step:
Firstly, preparing polypropylene cold drawn fibers: polypropylene is put into injector, under room temperature environment stretch 700%~ 800%, the material segment after stretching is cut into the polypropylene cold drawing particle for length in 10mm, width about 2mm, thickness about 1mm;
Secondly, manufacture mixed material: weigh: polypropylene 8KG, polypropylene cold drawing particle 2KG are prepared into mixed after mixing Close material;
Later, fabricated product: mixed material is put into the supercritical fluid fretting map injection (mo(u)lding) machine and is passed through injection The supercritical nitrogen of gross mass 1.0% produces the foaming product with specific micro pore shape;The wherein melt temperature of injector It is arranged between 166~172 degrees Celsius.
Finally, carrying out tensile property test to obtained polypropylene microporous product, test result is shown in Table 1.
In order to be illustrated to effect of the invention, comparative example 5, the preparation process and reality of raw material are in addition listed It is similar to apply example 5, but polypropylene cold drawing particle is not added, polypropylene microporous product obtained by comparative example 5 is stretched Performance test, test result are also found among table 1.It can be seen that by the data of table 1 and joined 20% polypropylene cold drawing particle The tensile strength of resulting foaming product and elongation at break are greatly improved afterwards.
Embodiment 6
The present embodiment is to together function as foaming agent using supercritical fluid and chemical blowing masterbatch to regulate and control polypropylene And its cell morphology of blend foaming injection product.Equipment aspect needs the note with supercritical fluid function of injecting Machine (for example, commercialized MUCELL fretting map injection (mo(u)lding) machine) and common extruder are penetrated, the mold used is standard tensile Batten, the extruder for raw material mixing can be single screw rod or double-screw type.
The specific implementation step of embodiment 6:
Firstly, preparing polypropylene cold drawn fibers: polypropylene being put into injector and prepares resulting batten in room temperature environment It is lower stretch 700%~800%, by the material segment after stretching cut for length 10mm, width about 2mm, thickness about 1mm poly- third Alkene cold drawing particle;
Secondly, manufacture foaming concentrate: raw material is weighed according to following quality: LDPE:0.638kg, AC:0.2kg, ZnO: 0.022kg, high-melting-point PE wax: 0.06kg, nano silica: 0.08kg;After raw material is separately dried, mixed in kneading machine Foaming concentrate uniformly and by double screw extruder is made, melt temperature is 125 DEG C in extrusion process;
Again, manufacture mixed material: weighing: polypropylene 7.8KG, foaming concentrate 0.2KG, polypropylene cold drawing particle 2KG are mixed Mixed material is prepared into after closing uniformly;
Later, fabricated product: mixed material is put into the supercritical fluid fretting map injection (mo(u)lding) machine and is passed through by note The supercritical carbon dioxide of firing association's quality 0.4% produces the foaming product with specific micro pore shape;Wherein injector is molten Temperature is arranged between 166~172 degrees Celsius.
Finally, carrying out tensile property test to obtained polypropylene microporous product, test result is shown in Table 1.
In order to be illustrated to effect of the invention, comparative example 6, the preparation process and reality of raw material are in addition listed It is similar to apply example 6, but polypropylene cold drawing particle is not added, polypropylene microporous product obtained by comparative example 6 is stretched Performance test, test result are also found among table 1.It can be seen that by the data of table 1 and joined 20% polypropylene cold drawing particle The tensile strength of resulting foaming product and elongation at break are greatly improved afterwards.
Embodiment 7
The present embodiment is to generate gas using chemical blowing masterbatch and then regulate and control polypropylene and its blend foaming note Penetrate the cell morphology of product.Equipment aspect, needs common an injector and extruder, injector can be hydraulic drive, All-electric or electro-hydraulic joint, for the injector without installing self-locking nozzle additional, the mold used is standard tensile batten, is used for raw material Mixed extruder can be single screw rod or double-screw type.
The specific implementation step of embodiment 7:
Firstly, manufacture foaming concentrate: raw material is weighed according to following quality: LDPE:0.7995kg, AC:0.1kg, ZnO: 0.0105kg, high-melting-point PE wax: 0.04kg, nano-titanium dioxide: 0.05kg;After raw material is separately dried, mixed in kneading machine It closes uniformly and foaming concentrate is made by double screw extruder, melt temperature is 120 DEG C in extrusion process;
Secondly, preparing polypropylene cold drawn fibers: polypropylene being put into injector and prepares resulting batten in room temperature environment It is lower stretch 700%~800%, by the material segment after stretching cut for length 3mm, width about 1mm, thickness about 0.5mm gather Propylene cold drawing particle;
Then, raw material polypropylene: 4.75KG, low density polyethylene (LDPE) 2.25KG, polypropylene cold drawing particle: 2KG, foaming are weighed Masterbatch: 1KG is prepared into mixed material after mixing;
Later, mixed material is put into normal injection machine and processes product;The wherein melt temperature setting of injector Between 166~172 degrees Celsius.
Finally, carrying out tensile property test to obtained polypropylene microporous product, test result is shown in Table 1.
In order to be illustrated to effect of the invention, comparative example 7, the preparation process and reality of raw material are in addition listed It is similar to apply example 7, but polypropylene cold drawing particle is not added, polypropylene microporous product obtained by comparative example 7 is stretched Performance test, test result are also found among table 1.It can be seen that by the data of table 1 and joined 20% polypropylene cold drawing particle The tensile strength of resulting PP/LDPE blend foaming product and elongation at break are greatly improved afterwards.
Embodiment 8
The present embodiment is to regulate and control polypropylene and its blend foaming injection product as foaming agent using supercritical fluid Cell morphology.Equipment aspect needs the injector with supercritical fluid function of injecting (for example, commercialized MUCELL fretting map injection (mo(u)lding) machine) and common extruder, the mold used is standard tensile batten, for raw material mixing Extruder can be single screw rod or double-screw type.
The specific implementation step of embodiment 8:
Firstly, preparing polypropylene cold drawn fibers: polypropylene being put into injector and prepares resulting batten in room temperature environment It is lower stretch 700%~800%, by the material segment after stretching cut for length 10mm, width about 2mm, thickness about 1mm poly- third Alkene cold drawing particle;
Secondly, manufacture mixed material: weighing: polypropylene 5.5KG, high density polyethylene (HDPE) 2.5KG, polypropylene cold drawing particle 2KG is prepared into mixed material after mixing;
Later, fabricated product.Mixed material is put into the supercritical fluid fretting map injection (mo(u)lding) machine and is passed through injection The supercritical nitrogen of gross mass 0.3% produces the foaming product with specific micro pore shape;The wherein melt temperature of injector It is arranged between 166~172 degrees Celsius.
Finally, carrying out tensile property test to obtained polypropylene microporous product, test result is shown in Table 1.
In order to be illustrated to effect of the invention, comparative example 8, the preparation process and reality of raw material are in addition listed It is similar to apply example 8, but polypropylene cold drawing particle is not added, polypropylene microporous product obtained by comparative example 8 is stretched Performance test, test result are also found among table 1.It can be seen that by the data of table 1 and joined 20% polypropylene cold drawing particle The tensile strength of resulting PP/HDPE blend foaming product and elongation at break are greatly improved afterwards.
Embodiment 9
The present embodiment is to regulate and control polypropylene and its blend foaming injection product as foaming agent using supercritical fluid Cell morphology.Equipment aspect needs the injector with supercritical fluid function of injecting (for example, commercialized MUCELL fretting map injection (mo(u)lding) machine) and common extruder, the mold used is standard tensile batten, for raw material mixing Extruder can be single screw rod or double-screw type.
The specific implementation step of embodiment 9:
Firstly, preparing polypropylene cold drawn fibers: polypropylene being put into injector and prepares resulting batten in room temperature environment It is lower stretch 700%~800%, by the material segment after stretching cut for length 10mm, width about 2mm, thickness about 1mm poly- third Alkene cold drawing particle;
Secondly, manufacture mixed material: weigh: polypropylene 3KG, low density polyethylene (LDPE) 5KG, polypropylene cold drawing particle 2KG are mixed Mixed material is prepared into after closing uniformly;
Later, fabricated product: mixed material is put into the supercritical fluid fretting map injection (mo(u)lding) machine and is passed through injection The supercritical carbon dioxide of gross mass 1.0% produces the foaming product with specific micro pore shape;The wherein melt of injector Temperature setting is between 166~172 degrees Celsius.
Finally, carrying out tensile property test to obtained polypropylene microporous product, test result is shown in Table 1.
In order to be illustrated to effect of the invention, comparative example 9, the preparation process and reality of raw material are in addition listed It is similar to apply example 9, but polypropylene cold drawing particle is not added, polypropylene microporous product obtained by comparative example 9 is stretched Performance test, test result are also found among table 1.It can be seen that by the data of table 1 and joined 20% polypropylene cold drawing particle The tensile strength of resulting PP/LDPE blend foaming product and elongation at break are greatly improved afterwards.
Embodiment 10
The present embodiment is to together function as foaming agent using supercritical fluid and chemical blowing masterbatch to regulate and control polypropylene And its cell morphology of blend foaming injection product.Equipment aspect needs the note with supercritical fluid function of injecting Machine (for example, commercialized MUCELL fretting map injection (mo(u)lding) machine) and common extruder are penetrated, the mold used is standard tensile Batten, the extruder for raw material mixing can be single screw rod or double-screw type.
The specific implementation step of embodiment 10:
Firstly, preparing polypropylene cold drawn fibers: polypropylene being put into injector and prepares resulting batten in room temperature environment It is lower stretch 700%~800%, by the material segment after stretching cut for length 10mm, width about 2mm, thickness about 1mm poly- third Alkene cold drawing particle;
Secondly, manufacture foaming concentrate: raw material is weighed according to following quality: LDPE:0.638kg, AC:0.2kg, ZnO: 0.022kg, high-melting-point PE wax: 0.06kg, nano silica: 0.08kg;After raw material is separately dried, mixed in kneading machine Foaming concentrate uniformly and by double screw extruder is made, melt temperature is 125 DEG C in extrusion process;
Again, manufacture mixed material: weighing: polypropylene 2.9KG, high density polyethylene (HDPE) 4.9KG, foaming concentrate 0.2KG gather Propylene cold drawing particle 2KG, is prepared into mixed material after mixing;
Later, fabricated product: mixed material is put into the supercritical fluid fretting map injection (mo(u)lding) machine and is passed through by note The supercritical nitrogen of firing association's quality 0.5% produces the foaming product with specific micro pore shape;The wherein melt temperature of injector Degree is arranged between 166~172 degrees Celsius.
Tensile property test is carried out to obtained polypropylene microporous product, test result is shown in Table 1.
In order to be illustrated to effect of the invention, in addition list comparative example 10, the preparation process of raw material and Embodiment 10 is similar, but polypropylene cold drawing particle is not added, and polypropylene microporous product obtained by comparative example 10 is carried out Tensile property test, test result are also found among table 1.It can be seen that by the data of table 1 and joined 20% polypropylene cold drawing The tensile strength of resulting PP/HDPE blend foaming product and elongation at break are greatly improved after particle.
The tensile property of 1 different materials of table compares
It can be seen from Table 1 that the foaming product of polypropylene and its blend of the invention has the micropore of specific modality Structure shows density low (because of the presence of micropores a large amount of inside product, causing extrudate density to reduce, weight saving), mechanical property The excellent feature of energy, has excellent application prospect.The tensile strength and elongation at break of foaming product produced by the present invention are same Shi Tigao, wherein tensile strength improves at least 15%, solves existing product method for toughening and increases in product elongation at break While will lead to tensile strength reduce the problem of.

Claims (10)

1. a kind of polypropylene or polypropylene composite foaming product, it is characterised in that: micropore takes in specific in the foaming product Tropism arrangement, the specific orientation are that micropore is parallel to each other with flow direction.
2. the preparation method of a kind of polypropylene described in claim 1 or polypropylene composite foaming product, it is characterised in that: will Polypropylene cold drawn fibers are added to polypropylene by a certain percentage or it is blended in material, are infused using Water blown injection, chemical blowing It penetrates, one of supercritical fluid foaming injection or chemical blowing/supercritical fluid foaming composite injection mode has to be made The polypropylene or polypropylene composite foaming product of specific orientation micropore.
3. the preparation method of polypropylene according to claim 2 or polypropylene composite foaming product, it is characterised in that: institute Polypropylene cold drawn fibers are stated to be prepared with the following method: polypropylene stretches to 500% below its crystallization temperature~ 800%, the material segment after stretching is cut as particle;Wherein, the length of particle be 3~15mm, width be 1~4mm, with a thickness of 0.5~1.5mm.
4. the preparation method of polypropylene according to claim 2 or polypropylene composite foaming product, which is characterized in that tool Body includes the following steps:
Step 1, polypropylene is stretched to 500%~800% below its crystallization temperature, is by the material segment cutting after stretching Grain;Wherein, the length of particle is 3~15mm, width is 1~4mm, with a thickness of 0.5~1.5mm;
Step 2, particle is added to polypropylene by a certain percentage or it is blended in material, prepares resulting mixture after mixing Material;
Step 3, mixed material is put into injection (mo(u)lding) machine, has specific orientation micro- by the effect production of proper amount of gas The foaming product in hole;Wherein, the temperature of melt is 166~172 DEG C in injection (mo(u)lding) machine.
5. the preparation method of polypropylene according to claim 3 or polypropylene composite foaming product, it is characterised in that: step In rapid 3, one or both of the gas decomposes for chemical blowing master batch or supercritical fluid decompression changes form is compound to be obtained The gas arrived, or the gas thermally decomposed to yield for water.
6. the preparation method of polypropylene according to claim 2 or polypropylene composite foaming product, which is characterized in that will Polypropylene cold drawn fibers are added to polypropylene by a certain percentage or it is blended in material, are prepared and are had using chemical blowing injection system There are the polypropylene or polypropylene composite foaming product of specific orientation micropore, specifically comprises the following steps:
Step 1, lead to after foaming agent, blowing promotor, nucleating agent, dispersing agent and the vector resin after drying being mixed in a certain ratio It crosses extrusion mechanism and obtains foaming concentrate;
Step 2, polypropylene is stretched to 500%~800% below its crystallization temperature, is by the material segment cutting after stretching Grain;Wherein, the length of particle is 3~15mm, width is 1~4mm, with a thickness of 0.5~1.5mm;
Step 3, particle made from step 2 is added to polypropylene by the 5~50% of mixed material gross mass or material is blended in it In, and foaming concentrate made from step 1 is added by a certain percentage, the quality accounting of foaming agent effective component is in foaming concentrate 0.4%~1.0%, mixed material is obtained after mixing;
Step 4, mixed material is put into injector, wherein the temperature of melt is 166~172 DEG C in injector.
7. the preparation method of polypropylene according to claim 6 or polypropylene composite foaming product, it is characterised in that: step In rapid 1, the foaming concentrate is grouped as by the group of following mass fraction: 10~30 parts of foaming agents, 4~8 parts of dispersing agents, 5~10 Part nucleating agent and 50~80 parts of vector resins;Wherein, the additional amount of blowing promotor is the 10.5~11.3% of foaming agent quality; Foaming agent is azodicarbonamide;Blowing promotor is one or two kinds of mixing of zinc oxide or barium monoxide;Dispersing agent is PE wax; Nucleating agent is nano-titanium dioxide or nano silica;Vector resin is polyethylene.
8. the preparation method of polypropylene according to claim 2 or polypropylene composite foaming product, which is characterized in that will Polypropylene cold drawn fibers are added to polypropylene by a certain percentage or it is blended in material, are had using the preparation of Water blown injection system The polypropylene or polypropylene composite foaming product of specific orientation micropore, specifically comprise the following steps:
Step 1, polypropylene is stretched to 500%~800% below its crystallization temperature, is by the material segment cutting after stretching Grain;Wherein, the length of particle is 3~15mm, width is 1~4mm, with a thickness of 0.5~1.5mm;
Step 2, carrier material is made by plastic extruder after the desired amount of active carbon and polypropylene and its blend being mixed;
Step 3, suitable water is dispersed in carrier material made from step 2, forms aqueous mixture material;
Step 4, the aqueous mixture material for particle made from step 1 being added to step 3 by the 5~50% of mixed material gross mass In, mixed material is obtained after mixing;
Step 5, mixed material is put into injector, wherein the temperature of melt is 166~172 DEG C in injector.
9. the preparation method of polypropylene according to claim 2 or polypropylene composite foaming product, which is characterized in that will Polypropylene cold drawn fibers are added to polypropylene by a certain percentage or it is blended in material, using supercritical fluid foaming injection mode The polypropylene or polypropylene composite foaming product with specific orientation micropore are prepared, is specifically comprised the following steps:
Step 1, polypropylene is stretched to 500%~800% below its crystallization temperature, is by the material segment cutting after stretching Grain;Wherein, the length of particle is 3~15mm, width is 1~4mm, with a thickness of 0.5~1.5mm;
Step 2, particle made from step 1 is added to polypropylene by the 5~50% of mixed material gross mass or material is blended in it In, mixed material is obtained after mixing;
Step 3, mixed material is put into the injection (mo(u)lding) machine with injection apparatus for supercritical fluid, in specific technique item The foaming product with specific orientation micropore is made under part;Wherein, melt temperature is 166~172 DEG C in injection (mo(u)lding) machine.
10. the preparation method of polypropylene according to claim 9 or polypropylene composite foaming product, it is characterised in that: In step 3, supercritical fluid is the compound of the one or two of supercritical nitrogen or carbon dioxide, and injection rate is foaming product The 0.3~1.0% of quality.
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