CN106543565B - A kind of polypropylene material and preparation method thereof for toilet seat - Google Patents
A kind of polypropylene material and preparation method thereof for toilet seat Download PDFInfo
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- CN106543565B CN106543565B CN201611127821.7A CN201611127821A CN106543565B CN 106543565 B CN106543565 B CN 106543565B CN 201611127821 A CN201611127821 A CN 201611127821A CN 106543565 B CN106543565 B CN 106543565B
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L23/10—Homopolymers or copolymers of propene
- C08L23/12—Polypropene
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L23/10—Homopolymers or copolymers of propene
- C08L23/14—Copolymers of propene
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/30—Sulfur-, selenium- or tellurium-containing compounds
- C08K2003/3045—Sulfates
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/002—Physical properties
- C08K2201/003—Additives being defined by their diameter
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/002—Physical properties
- C08K2201/004—Additives being defined by their length
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/011—Nanostructured additives
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
- C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
- C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/14—Polymer mixtures characterised by other features containing polymeric additives characterised by shape
- C08L2205/16—Fibres; Fibrils
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Abstract
The invention discloses a kind of polypropylene materials for toilet seat, are made of following raw material according to parts by weight：0.5-4 parts of red mud, 5-9 parts of bamboo fibre, -42 parts of polipropene 25,4-10 parts of barium sulfate, 2-6 parts of starch, 2-8 parts of polyvinyl alcohol, 1-3 parts of talcum powder, 1-4 parts of graphite, 6-12 parts of carbon black, 2-5 parts of silicon carbide powder, 5-10 parts of stalk powder, 0.2-1 parts of carbon fiber, 3-8 parts of toughener, 0.1-1.5 parts of stabilizer, 7-16 parts of fire retardant, 0.5-1 parts of antioxidant, 0.2-1 parts of finishing agent and 2-5 parts of extract solution from aloe.The preparation method of the material is also disclosed in the present invention.Polypropylene material prepared by the present invention, each component plays synergistic effect, has excellent glossiness, high bending strength and high creep resistance energy, can be applied to the production of all-plastic toilet base material or similar requires production, with the excellent resistance to loading of carrying toilet seat, have a extensive future.
Description
Technical field
The present invention relates to field of material preparation, specifically a kind of polypropylene material for toilet seat.
Background technique
With the economic development and improvement of people's living standards, more and more families are all mounted in the family of oneself
Toilet seat.Toilet seat includes toilet base, pedestal fixing seat, base upper cover, seat ring fixing seat, seat ring, flap, water tank, benefit
Hydrosphere, blowdown siphon pipe, jet water spout, separating stand and toilet seat liner；Pedestal fixing seat is mounted on the bottom of toilet base,
For fixing the toilet base on the ground, toilet seat liner is fixedly mounted in the toilet base, the bottom
Lid is equipped with water tank mounting base on seat, and water tank is mounted in water tank mounting base.
The main material of currently manufactured toilet seat is that ceramics and acrylic, ceramic production technology are formed into after greenwave through height
Warm sinter molding, production technology is complicated, the loss of the gypsum mold in greenwave manufacturing process, the dry change with sintering process of greenwave
Shape, the consistency after causing formed product is poor, and yield rate is low, and yield rate highest also only has 60%, and ceramic pedestal pan weight
Amount is big, transport is inconvenient, is easily damaged, and can only abandon after damage, can not repairing and reusing, result in waste of resources, surface color and polish list
One, it is not able to satisfy the decoration demand of people；Acrylic toilet seat production technology is with acryl plates through vacuum thermoforming blank,
Then overall package and surface modification are being carried out with unsaturated-resin material, frp process again, inside to fill mountain flour mixed
It closes object to be used to support and fix, cannot be recycled after formed product, since frp process will use glass fibers
Dimension, certainly will will cause environmental pollution, while a large amount of handwork is needed in production process, and mechanization degree is low,
There is also the features of consistency difference for its product, this is just that people bring inconvenience.
Summary of the invention
The purpose of the present invention is to provide a kind of polypropylene materials for toilet seat, to solve to mention in above-mentioned background technique
Out the problem of.
To achieve the above object, the present invention provides the following technical solutions：
A kind of polypropylene material for toilet seat is made of following raw material according to parts by weight：0.5-4 parts of red mud, bamboo are fine
Tie up 5-9 parts, -42 parts of polipropene 25,4-10 parts of barium sulfate, 2-6 parts of starch, 2-8 parts of polyvinyl alcohol, 1-3 parts of talcum powder, graphite 1-
4 parts, 6-12 parts of carbon black, 2-5 parts of silicon carbide powder, 5-10 parts of stalk powder, 0.2-1 parts of carbon fiber, 3-8 parts of toughener, stabilization
0.1-1.5 parts of agent, 7-16 parts of fire retardant, 0.5-1 parts of antioxidant, 0.2-1 parts of finishing agent and 2-5 parts of extract solution from aloe.
As a further solution of the present invention：Polypropylene is one or two kinds of using homopolypropylene and copolymer polypropylene
Mixture, stalk using corn stover, soybean stalk, wheat stalk and broomcorn straw one or several kinds of mixtures.
As a further solution of the present invention：The diameter of carbon fiber is 50nm-200nm, length 2um-300um, stone
The partial size of ink, carbon black and silicon carbide powder is 0.15um-150um.
The preparation method of the polypropylene material for toilet seat, specific step is as follows：
Step 1 weighs various raw materials, spare；
Barium sulfate and silicon carbide powder are put into high mixer by step 2,15-30 minutes dry under 100-150 degrees Celsius,
Storage is kept the temperature after blowing, it is spare；
Red mud and bamboo fibre are put into ball mill ball milling 1-3 hours, obtain the first mix powder by step 3；
Step 4, it is 34-52% that starch, which is sequentially placed into sodium hydroxide solution that mass fraction is 25-36% and mass fraction,
Sodium carbonate liquor in 10-18 minutes and 25-40 minute, then be washed with deionized water to neutral and dry, modification can be obtained
Starch；
Step 5, by the first mix powder, modified starch, polypropylene, polyvinyl alcohol, talcum powder, graphite, carbon black, straw
Stalk powder, carbon fiber, toughener, stabilizer, fire retardant, antioxidant, finishing agent, extract solution from aloe, barium sulfate and carbonization
Si powder is put into high mixer, and mixture temperature is 55-85 degrees Celsius, and mixing obtains mixed material in 3-7 minutes；
Mixed material is put into dual-screw pelletizer by step 6, is turned under 200-235 degrees Celsius with 500-720rpm
It is granulated under the fast and negative negative 0.05MPa vacuum degree condition of 0.12-, finished product can be obtained.
Compared with prior art, the beneficial effects of the invention are as follows：Polypropylene material prepared by the present invention, each component play collaboration
Effect has excellent glossiness, high bending strength and high creep resistance energy, can be applied to all-plastic toilet base material
It produces or similar to production is required, there is the excellent resistance to loading of carrying toilet seat, have a extensive future.
Specific embodiment
The technical solution of the patent is explained in further detail With reference to embodiment.
Embodiment 1
A kind of polypropylene material for toilet seat is made of following raw material according to parts by weight：0.5 part of red mud, bamboo fibre 5
Part, polipropene 25 part, 4 parts of barium sulfate, 2 parts of starch, 2 parts of polyvinyl alcohol, 1 part of talcum powder, 1 part of graphite, 6 parts of carbon black, silicon carbide
2 parts of powder, 5 parts of stalk powder, 0.2 part of carbon fiber, 3 parts of toughener, 0.1 part of stabilizer, 7 parts of fire retardant, 0.5 part of antioxidant,
0.2 part and 2 parts of extract solution from aloe of finishing agent.Polypropylene uses homopolypropylene, and stalk uses soybean stalk.
The preparation method of the polypropylene material for toilet seat, specific step is as follows：
Step 1 weighs various raw materials, spare；
Barium sulfate and silicon carbide powder are put into high mixer by step 2,18 minutes dry under 110 degrees Celsius, after blowing
Heat preservation storage, it is spare；
Red mud and bamboo fibre are put into ball milling 1.5 hours in ball mill, obtain the first mix powder by step 3；
Starch is sequentially placed into the sodium hydroxide solution that mass fraction is 28% and the carbonic acid that mass fraction is 37% by step 4
It 12 minutes and 28 minutes in sodium solution, then is washed with deionized water to neutral and drying, modified starch can be obtained；
Step 5, by the first mix powder, modified starch, polypropylene, polyvinyl alcohol, talcum powder, graphite, carbon black, straw
Stalk powder, carbon fiber, toughener, stabilizer, fire retardant, antioxidant, finishing agent, extract solution from aloe, barium sulfate and carbonization
Si powder is put into high mixer, and mixture temperature is 58 degrees Celsius, and mixing obtains mixed material in 4 minutes；
Mixed material is put into dual-screw pelletizer by step 6, at 200 degrees celsius with the revolving speed of 540rpm and negative
It is granulated under 0.10MPa vacuum degree condition, finished product can be obtained.
The product of embodiment 1 is tested for the property, test result is：Tensile strength 38.6MPa, the punching of simply supported beam non-notch
Hit intensity is 19.5KJ/m2, bending strength 53.4MPa, heat distortion temperature is 156 DEG C, and glossiness is 73Gs (60 °).
Embodiment 2
A kind of polypropylene material for toilet seat is made of following raw material according to parts by weight：2 parts of red mud, bamboo fibre 7
Part, 35 parts of polypropylene, 7 parts of barium sulfate, 4 parts of starch, 5 parts of polyvinyl alcohol, 2 parts of talcum powder, 2 parts of graphite, 9 parts of carbon black, silicon carbide
3 parts of powder, 8 parts of stalk powder, 0.6 part of carbon fiber, 5 parts of toughener, 1 part of stabilizer, 12 parts of fire retardant, 0.7 part of antioxidant, table
0.5 part and 3 parts of extract solution from aloe of face brightener.The diameter of carbon fiber is 80nm, length 120um, graphite, carbon black and carbonization
The partial size of Si powder is 6um.
The preparation method of the polypropylene material for toilet seat, specific step is as follows：
Step 1 weighs various raw materials, spare；
Barium sulfate and silicon carbide powder are put into high mixer by step 2,24 minutes dry under 140 degrees Celsius, after blowing
Heat preservation storage, it is spare；
Red mud and bamboo fibre are put into ball milling 2 hours in ball mill, obtain the first mix powder by step 3；
Starch is sequentially placed into the sodium hydroxide solution that mass fraction is 32% and the carbonic acid that mass fraction is 45% by step 4
It 16 minutes and 35 minutes in sodium solution, then is washed with deionized water to neutral and drying, modified starch can be obtained；
Step 5, by the first mix powder, modified starch, polypropylene, polyvinyl alcohol, talcum powder, graphite, carbon black, straw
Stalk powder, carbon fiber, toughener, stabilizer, fire retardant, antioxidant, finishing agent, extract solution from aloe, barium sulfate and carbonization
Si powder is put into high mixer, and mixture temperature is 70 degrees Celsius, and mixing obtains mixed material in 6 minutes；
Mixed material is put into dual-screw pelletizer by step 6, with the revolving speed of 630rpm and negative under 220 degrees Celsius
It is granulated under 0.08MPa vacuum degree condition, finished product can be obtained.
The product of embodiment 2 is tested for the property, test result is：Tensile strength 40.3MPa, the punching of simply supported beam non-notch
Hit intensity is 19.1KJ/m2, bending strength 56.3MPa, heat distortion temperature is 148 DEG C, and glossiness is 77Gs (60 °).
Embodiment 3
A kind of polypropylene material for toilet seat is made of following raw material according to parts by weight：4 parts of red mud, bamboo fibre 9
Part, 42 parts of polypropylene, 10 parts of barium sulfate, 6 parts of starch, 8 parts of polyvinyl alcohol, 3 parts of talcum powder, 4 parts of graphite, 12 parts of carbon black, carbonization
5 parts of Si powder, 10 parts of stalk powder, 1 part of carbon fiber, 8 parts of toughener, 1.5 parts of stabilizer, 16 parts of fire retardant, 1 part of antioxidant,
1 part and 5 parts of extract solution from aloe of finishing agent.Polypropylene uses the mixture of homopolypropylene and copolymer polypropylene, and stalk is adopted
With the mixture of corn stover, soybean stalk, wheat stalk and broomcorn straw.The diameter of carbon fiber is 160nm, length is
180um, the partial size of graphite, carbon black and silicon carbide powder are 80um.
The preparation method of the polypropylene material for toilet seat, specific step is as follows：
Step 1 weighs various raw materials, spare；
Barium sulfate and silicon carbide powder are put into high mixer by step 2,20 minutes dry under 150 degrees Celsius, after blowing
Heat preservation storage, it is spare；
Red mud and bamboo fibre are put into ball milling 3 hours in ball mill, obtain the first mix powder by step 3；
Starch is sequentially placed into the sodium hydroxide solution that mass fraction is 32% and the carbonic acid that mass fraction is 45% by step 4
It 16 minutes and 35 minutes in sodium solution, then is washed with deionized water to neutral and drying, modified starch can be obtained；
Step 5, by the first mix powder, modified starch, polypropylene, polyvinyl alcohol, talcum powder, graphite, carbon black, straw
Stalk powder, carbon fiber, toughener, stabilizer, fire retardant, antioxidant, finishing agent, extract solution from aloe, barium sulfate and carbonization
Si powder is put into high mixer, and mixture temperature is 75 degrees Celsius, and mixing obtains mixed material in 5 minutes；
Mixed material is put into dual-screw pelletizer by step 6, with the revolving speed of 720rpm and negative under 230 degrees Celsius
It is granulated under 0.05MPa vacuum degree condition, finished product can be obtained.
The product of embodiment 3 is tested for the property, test result is：Tensile strength 36.1MPa, the punching of simply supported beam non-notch
Hit intensity is 18.3KJ/m2, bending strength 48.5MPa, heat distortion temperature is 147 DEG C, and glossiness is 71Gs (60 °).
Comparative example 1
Except extract solution from aloe is not contained, remaining component and preparation method of comparative example 1 are same as Example 2.
The product of comparative example 1 is tested for the property, test result is：Tensile strength 26.3MPa, the punching of simply supported beam non-notch
Hit intensity is 13.1KJ/m2, bending strength 37.2MPa, heat distortion temperature is 84 DEG C, and glossiness is 36Gs (60 °).
As can be seen that the product of embodiment 1-3 has good stretching, bending and shock resistance energy-absorbing from test data,
Thermal stability and glossiness are good, have wide prospect of the application.
It is obvious to a person skilled in the art that invention is not limited to the details of the above exemplary embodiments, Er Qie
In the case where without departing substantially from spirit or essential attributes of the invention, the present invention can be realized in other specific forms.Therefore, no matter
From the point of view of which point, the present embodiments are to be considered as illustrative and not restrictive, and the scope of the present invention is by appended power
Benefit requires rather than above description limits, it is intended that all by what is fallen within the meaning and scope of the equivalent elements of the claims
Variation is included within the present invention.
In addition, it should be understood that although this specification is described in terms of embodiments, but not each embodiment is only wrapped
Containing an independent technical solution, this description of the specification is merely for the sake of clarity, and those skilled in the art should
It considers the specification as a whole, the technical solutions in the various embodiments may also be suitably combined, forms those skilled in the art
The other embodiments being understood that.
Claims (3)
1. a kind of polypropylene material for toilet seat, which is characterized in that be made of following raw material according to parts by weight：Red mud 0.5-
4 parts, 5-9 parts of bamboo fibre, -42 parts of polipropene 25,4-10 parts of barium sulfate, 2-6 parts of starch, 2-8 parts of polyvinyl alcohol, talcum powder 1-3
Part, 1-4 parts of graphite, 6-12 parts of carbon black, 2-5 parts of silicon carbide powder, 5-10 parts of stalk powder, 0.2-1 parts of carbon fiber, toughener 3-
8 parts, 0.1-1.5 parts of stabilizer, 7-16 parts of fire retardant, 0.5-1 parts of antioxidant, 0.2-1 parts of finishing agent and extract solution from aloe
2-5 parts,
Specific step is as follows for preparation method：
Step 1 weighs various raw materials, spare；
Barium sulfate and silicon carbide powder are put into high mixer by step 2,15-30 minutes dry under 100-150 degrees Celsius, blowing
Heat preservation storage afterwards, it is spare；
Red mud and bamboo fibre are put into ball mill ball milling 1-3 hours, obtain the first mix powder by step 3；
Starch is sequentially placed into the sodium hydroxide solution that mass fraction is 25-36% and the carbon that mass fraction is 34-52% by step 4
It 10-18 minutes and 25-40 minutes in acid sodium solution, then is washed with deionized water to neutral and drying, modified starch can be obtained；
Step 5, by the first mix powder, modified starch, polypropylene, polyvinyl alcohol, talcum powder, graphite, carbon black, straw powder
End, carbon fiber, toughener, stabilizer, fire retardant, antioxidant, finishing agent, extract solution from aloe, barium sulfate and carborundum powder
End is put into high mixer, and mixture temperature is 55-85 degrees Celsius, and mixing obtains mixed material in 3-7 minutes；
Mixed material is put into dual-screw pelletizer by step 6, under 200-235 degrees Celsius with the revolving speed of 500-720rpm and
It is granulated under the negative negative 0.05MPa vacuum degree condition of 0.12-, finished product can be obtained.
2. the polypropylene material according to claim 1 for toilet seat, which is characterized in that the polypropylene uses homopolymerization
One or two kinds of mixture of polypropylene and copolymer polypropylene, stalk using corn stover, soybean stalk, wheat stalk and
One or several kinds of mixtures of broomcorn straw.
3. the polypropylene material according to claim 1 or 2 for toilet seat, which is characterized in that the carbon fiber it is straight
Diameter is 50nm-200nm, length 2um-300um, and the partial size of graphite, carbon black and silicon carbide powder is 0.15um-150um.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811183713.0A CN109135065A (en) | 2016-12-09 | 2016-12-09 | A kind of preparation method of the polypropylene material for daily necessities |
| CN201811184321.6A CN109135066A (en) | 2016-12-09 | 2016-12-09 | A kind of polypropylene material for daily necessities |
| CN201611127821.7A CN106543565B (en) | 2016-12-09 | 2016-12-09 | A kind of polypropylene material and preparation method thereof for toilet seat |
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| CN201611127821.7A CN106543565B (en) | 2016-12-09 | 2016-12-09 | A kind of polypropylene material and preparation method thereof for toilet seat |
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| CN201811184321.6A Division CN109135066A (en) | 2016-12-09 | 2016-12-09 | A kind of polypropylene material for daily necessities |
| CN201811183713.0A Division CN109135065A (en) | 2016-12-09 | 2016-12-09 | A kind of preparation method of the polypropylene material for daily necessities |
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| CN201611127821.7A Active CN106543565B (en) | 2016-12-09 | 2016-12-09 | A kind of polypropylene material and preparation method thereof for toilet seat |
| CN201811184321.6A Withdrawn CN109135066A (en) | 2016-12-09 | 2016-12-09 | A kind of polypropylene material for daily necessities |
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| CN107177103A (en) * | 2017-07-18 | 2017-09-19 | 合肥万之景门窗有限公司 | A kind of heat-proof combustion-resistant plastic sheeting and preparation method thereof |
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| CN102702615A (en) * | 2012-05-14 | 2012-10-03 | 刘旭祥 | High-gloss polypropylene material for manufacturing bases of pedestal pans, and manufacturing method thereof |
| CN103498625A (en) * | 2013-10-21 | 2014-01-08 | 王清文 | Synthetic-wood solid wood composite door and window and manufacturing method thereof |
| CN104292620A (en) * | 2014-09-24 | 2015-01-21 | 铜陵市新泰电容电器有限责任公司 | Novel high-hardness plastic shell composition for capacitor |
| CN105646999A (en) * | 2014-11-10 | 2016-06-08 | 合肥杰事杰新材料股份有限公司 | Polypropylene composition and preparation method thereof |
Also Published As
| Publication number | Publication date |
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| CN109135065A (en) | 2019-01-04 |
| CN109135066A (en) | 2019-01-04 |
| CN106543565A (en) | 2017-03-29 |
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