CN109705464A - A kind of powdered rice hulls filling micro-foaming polypropylene composite material and preparation method thereof - Google Patents
A kind of powdered rice hulls filling micro-foaming polypropylene composite material and preparation method thereof Download PDFInfo
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- CN109705464A CN109705464A CN201811627393.3A CN201811627393A CN109705464A CN 109705464 A CN109705464 A CN 109705464A CN 201811627393 A CN201811627393 A CN 201811627393A CN 109705464 A CN109705464 A CN 109705464A
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- powdered rice
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Abstract
The present invention relates to polypropylene material technical field of modification, in particular to a kind of powdered rice hulls filling micro-foaming polypropylene composite material and preparation method thereof.Powdered rice hulls filling micro-foaming polypropylene composite material includes the raw material composition of following parts by weight: 100 parts of acrylic resin, 10~40 parts of powdered rice hulls, γ-(2, the third oxygen of 3- epoxy) propyl trimethoxy silicane, 0.1~5 part, 0.5~3 part of polyethylene wax, 0.1~5 part of nucleating agent, 0.1~5 part of foaming master batch, 0.05~2 part of antioxidant.Powdered rice hulls provided by the invention fill micro-foaming polypropylene composite material, using the microballoon foaming master batch containing core-shell structure, the product being molded after being blended with the shell powder filled polypropylene particulate material of preparation has preferable appearance, and interiors of products has foam structure that is fine and close and uniformly expanding, can reduce the weight of product.In addition the foam theory of such microballoon foaming master batch, which determines, will not generate any chemical substance, and what can be trusted contacts with food, for purposes such as food containers or utensils.
Description
Technical field
The present invention relates to polypropylene material technical field of modification, in particular to a kind of powdered rice hulls filling micro-foaming polypropylene is multiple
Condensation material and preparation method thereof.
Background technique
Green material is complied fully with as new material develops green economy, the environmental protection system of man and nature peaceful coexistence
Modeling formula.Wherein polypropylene material is as the high molecular material for mentioning material in non-renewable resources-petroleum, and global usage amount is huge
Greatly, most polypropylene product does not do effective recycling, causes indelible " white pollution " to environment, and
Petroleum has also gradually appeared exhausted state.And plant fiber of the rice husk as natural green, it can be used as filler and be added to polypropylene
In material, it is made into wood plastic composite, can be applicable in a variety of occasions；The PP composite material of powdered rice hulls filling simultaneously has
The advantages that incomparable advantage of timber, Anti-moth-eating, bacteriological protection breed, are ageing-resistant, corrosion-resistant, non-hygroscopic and recyclable.
But compared to natural timber, but have a the disadvantage is that density is greater than natural timber, so by the composite material
Foaming modification is carried out, but using conventional chemical foaming agent, product surface will appear " crazing " " gas trace " etc. in injection moulding process
Open defect can largely effect on products application scene；In addition the chemical foaming agent usually added is heated generation gas and pair
Product, often by-product and it is not applicable contacted with food, limit the material in this way in food containers and contact food utensil
On use.
For the research of powdered rice hulls filled polypropylene foaming, application publication number 201710541155.X, publication date 2017
In on October 20, in, a kind of nanometer of powdered rice hulls reinforced polypropylene foam composite material extremely preparation method is disclosed, using common poly-
Particulate propylene, high melt strength, propylene powder, modified rice husk powder, kraft pulp fiber, mixed foaming agent and nanometer are covered de-
Soil, wherein mixed foaming agent is the mixture of ammonium hydrogen carbonate and azo dimethylamine.The program passes through to coupling agent treatment powdered rice hulls
Technique, and improve using high melt strength, propylene powder the melt strength of system to support chemical foaming agent to decompose
Gas out, prevents gas trains from steeping.But the above way is mostly that mobility is poor there is also drawback, high melt strength, propylene powder
Polypropylene, addition high melt strength, propylene powder will affect the mobility of system, to limit the extensive use of material；
Secondly it is then that the gas generated using chemical foaming agent escapes into product surface in injection moulding process, it is outer forms crazing and gas trace etc.
Defect is seen, product appearance is influenced.
Summary of the invention
To solve the problems in above-mentioned background technique, the present invention provides a kind of powdered rice hulls filling micro-foaming polypropylene composite wood
Material, the raw material composition including following parts by weight:
The foaming master batch includes microballoon foaming agent 15%~58%；Polyvinyl resin 40%~80%；Random polypropylene
Wax 0.5%~3%, preferably low molecule random polypropylene wax；Antioxidant 0.05%~2%.
On the basis of above scheme, further, the microballoon foaming agent includes using thermoplastic acrylic resins
The shell of preparation and the alkanes gas coated by the shell.
On the basis of above scheme, further, the acrylic resin is homopolymerization class polypropylene.
On the basis of above scheme, further, the talcum powder that the nucleating agent is 1~5 μm of partial size；It is preferred that 5 μm
Talcum powder not only contributes to gas and forms gas core, moreover it is possible to reduce the frictional force of melt and mold cavity surface.
On the basis of above scheme, further, the antioxidant is four [β-(3,5- di-t-butyl -4- hydroxy benzenes
Base) propionic acid] pentaerythrite.
The present invention also provides a kind of preparation methods of powdered rice hulls filling micro-foaming polypropylene composite material as described above, including
Following steps:
Step a, powdered rice hulls are dried 24 hours at 100 DEG C, after by powdered rice hulls and γ-(2,3- the third oxygen of epoxy) propyl
High speed mixing smelting machine is added in trimethoxy silane, and high-speed mixer is arranged 110 DEG C of temperature, is kneaded 12min, is R1 after taking-up；
Step b, acrylic resin, R1, polyethylene wax, nucleating agent, antioxidant are added in high-speed mixer, stir 3min
It takes out；
Step c, the mixture for preparing step b passes through heating melting, mixing, shearing, extruding in double screw extruder,
Then extruding pelletization, after the particle that obtains extruding pelletization and the foaming master batch containing microballoon foaming agent be kneaded in high speed mixing smelting machine
5min fills micro-foaming polypropylene composite material to get powdered rice hulls.
On the basis of above scheme, further, the temperature of the extruder barrel is 170 DEG C~220 DEG C.
Powdered rice hulls provided by the invention fill micro-foaming polypropylene composite material, are foamed using the microballoon containing core-shell structure
Master batch, the product being molded after being blended with the shell powder filled polypropylene particulate material of preparation have preferable appearance, and interiors of products
There is foam structure that is fine and close and uniformly expanding, compared to the weight that the product without foaming master batch can reduce 10~25%.
It since powdered rice hulls are low-density fibre, is easy to accumulate to bath surface in mixed process, and causes to be easy skin-friction force mistake
Greatly, and then make the gas in the middle part of melt fluid that can constantly be turned to cavity surface, in turn result in the generation of the gentle trace of crazing；And
The present invention is modified powdered rice hulls using γ-(2,3- the third oxygen of epoxy) propyl trimethoxy silicane, can be improved powdered rice hulls with
The adhesive force of matrix resin, is retained in powdered rice hulls inside resin as much as possible；It part also can be in the powdered rice hulls of bath surface
Polyethylene wax combines, and reduces its frictional force with cavity surface, effectively prevent the generation of the gentle trace of crazing.In addition such microballoon is sent out
The foam theory of bubble master batch, which determines, will not generate any chemical substance, and what can be trusted contacts with food, be used for food containers
Or the purposes such as utensil, there is important practical application value.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In technical solution be clearly and completely described, it is clear that described embodiments are some of the embodiments of the present invention, without
It is whole embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art are not before making creative work
All other embodiment obtained is put, shall fall within the protection scope of the present invention.
The present invention provides formulation Example as shown in the table:
Table 1
Wherein, in embodiment 1~3 and comparative example 1,2 in, being related to nucleating agent is 5 μm of partial size of talcum powder, the antioxidant
For four [β-(3,5- di-tert-butyl-hydroxy phenyl) propionic acid] pentaerythrites；In 1~3 in embodiment foaming master batch be comprising
20% microballoon foaming agent, 75% polyvinyl resin, 3% low molecule random polypropylene wax and 2% 4 [β-(3,5- di-t-butyl -4-
Hydroxy phenyl) propionic acid] pentaerythrite；In comparative example 2 for 75% polyvinyl resin and 25% be 1:0.5 according to molar ratio carbon
The mixed foaming agent of sour hydrogen ammonium and azodicarbonamide；Powdered rice hulls used can use 100-120 mesh to obtain.
After weighing corresponding raw material by the parts by weight of each embodiment and comparative example of upper table, first by powdered rice hulls at 100 DEG C
Drying 24 hours, after high speed mixing smelting machine, high speed is added in powdered rice hulls and γ-(2,3- the third oxygen of epoxy) propyl trimethoxy silicane
Mixing machine is arranged 110 DEG C of temperature, is kneaded 12min, is R1 after taking-up；
Then acrylic resin, R1, polyethylene wax, nucleating agent, antioxidant are added in high-speed mixer, stirring 3min takes
Out；
The mixture finally prepared by step b passes through heating melting, mixing, shearing, extruding in double screw extruder, so
Extruding pelletization afterwards, after the particle that obtains extruding pelletization and the foaming master batch containing microballoon foaming agent be kneaded in high speed mixing smelting machine
5min, up to respective sample material.
The injected sample that above-described embodiment and comparative example raw material are prepared carries out following test or experiment, wherein stretching
Intensity, bending strength and impact strength are tested according to standard ISO527, ISO178, ISO179 respectively, and in addition net weight is note
Mould the difference of the product weight of the unexpanded product weight and fretting map of product, the number obtained divided by unexpanded product weight
Value.
Open defect degree, the appearance gas trace of main detection injecting products and the quantity and the depth of crazing；And score,
Judgment criteria is as follows:
The appearance of sample is evaluated with 10 people, and is averaged.
Test result is as follows shown in table:
Table 2
By upper table it can be seen that the mechanical performance of powdered rice hulls prepared by the present invention filling micro-foaming polypropylene composite material
It is excellent, and fretting map pore size is small and uniform, while excellent appearance, cooperates without obvious open defect, and between each component,
Compared with prior art, there is marked improvement.
Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention., rather than its limitations；To the greatest extent
Pipe present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that: its according to
So be possible to modify the technical solutions described in the foregoing embodiments, or to some or all of the technical features into
Row equivalent replacement；And these are modified or replaceed, various embodiments of the present invention technology that it does not separate the essence of the corresponding technical solution
The range of scheme.
Claims (7)
1. a kind of powdered rice hulls fill micro-foaming polypropylene composite material, which is characterized in that the raw material composition including following parts by weight:
The foaming master batch includes microballoon foaming agent 15%~58%, polyvinyl resin 40%~80%, random polypropylene wax
0.5%~3%, antioxidant 0.05%~2%.
2. powdered rice hulls according to claim 1 fill micro-foaming polypropylene composite material, it is characterised in that: the microballoon hair
Infusion includes the shell prepared using thermoplastic acrylic resins and the alkanes gas coated by the shell.
3. powdered rice hulls according to claim 1 fill micro-foaming polypropylene composite material, it is characterised in that: the polypropylene
Resin is homopolymerization class polypropylene.
4. powdered rice hulls according to claim 1 fill micro-foaming polypropylene composite material, it is characterised in that: the nucleating agent
For 1~5 μm of talcum powder of partial size.
5. powdered rice hulls according to claim 1 fill micro-foaming polypropylene composite material, it is characterised in that: the antioxidant
For four [β-(3,5- di-tert-butyl-hydroxy phenyl) propionic acid] pentaerythrites.
6. a kind of preparation method of any one of -5 powdered rice hulls filling micro-foaming polypropylene composite materials according to claim 1,
The following steps are included:
Step a, powdered rice hulls are dried 24 hours at 100 DEG C, after by powdered rice hulls and γ-(2,3- the third oxygen of epoxy) propyl front three
High speed mixing smelting machine is added in oxysilane, and high-speed mixer is arranged 110 DEG C of temperature, is kneaded 12min, is R1 after taking-up；
Step b, acrylic resin, R1, polyethylene wax, nucleating agent, antioxidant are added in high-speed mixer, stirring 3min takes
Out；
Step c, the mixture for preparing step b passes through heating melting, mixing, shearing, extruding in double screw extruder, then
Extruding pelletization, after the particle that obtains extruding pelletization and the foaming master batch containing microballoon foaming agent be kneaded in high speed mixing smelting machine
5min fills micro-foaming polypropylene composite material to get powdered rice hulls.
7. the preparation method of powdered rice hulls filling micro-foaming polypropylene composite material according to claim 6, it is characterised in that: institute
The temperature for stating extruder barrel is 170 DEG C~220 DEG C.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112063063A (en) * | 2020-08-14 | 2020-12-11 | 厦门美科安防科技有限公司 | Preparation method of polyethylene wax/SEBS (styrene-ethylene-butylene-styrene) -based nano-silver antibacterial material and application of material in polystyrene injection molding product |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112063063A (en) * | 2020-08-14 | 2020-12-11 | 厦门美科安防科技有限公司 | Preparation method of polyethylene wax/SEBS (styrene-ethylene-butylene-styrene) -based nano-silver antibacterial material and application of material in polystyrene injection molding product |
| CN112063063B (en) * | 2020-08-14 | 2023-10-31 | 厦门美科安防科技股份有限公司 | Preparation method of polyethylene wax/SEBS (styrene-ethylene-butylene-styrene) -based nano-silver antibacterial material and application of material in polystyrene injection molding products |
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Application publication date: 20190503 |