CN108329597A - A kind of PP and PE alloy structure foaming plates and preparation method thereof - Google Patents
A kind of PP and PE alloy structure foaming plates and preparation method thereof Download PDFInfo
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- CN108329597A CN108329597A CN201810232749.7A CN201810232749A CN108329597A CN 108329597 A CN108329597 A CN 108329597A CN 201810232749 A CN201810232749 A CN 201810232749A CN 108329597 A CN108329597 A CN 108329597A
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/04—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent
- C08J9/06—Working-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
- C08J9/08—Working-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 carbon dioxide
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F255/00—Macromolecular compounds obtained by polymerising monomers on to polymers of hydrocarbons as defined in group C08F10/00
- C08F255/02—Macromolecular compounds obtained by polymerising monomers on to polymers of hydrocarbons as defined in group C08F10/00 on to polymers of olefins having two or three carbon atoms
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2203/00—Foams characterized by the expanding agent
- C08J2203/02—CO2-releasing, e.g. NaHCO3 and citric acid
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2323/02—Characterised 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
- C08J2323/10—Homopolymers or copolymers of propene
- C08J2323/12—Polypropene
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2423/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2423/02—Characterised 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
- C08J2423/04—Homopolymers or copolymers of ethene
- C08J2423/06—Polyethene
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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
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2296—Oxides; Hydroxides of metals of zinc
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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
- C08K5/00—Use of organic ingredients
- C08K5/04—Oxygen-containing compounds
- C08K5/14—Peroxides
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- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
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Abstract
The present invention provides a kind of PP and PE alloy structure foaming plates and preparation method thereof, composition includes the component of following parts by weight：50 75 parts of homopolymerization PP, 20 40 parts of LDPE, 0.0005 0.002 parts of DCP, 0.01 0.05 parts of HDDA, 0.06 part of DVB0.01,0.01 0.1 parts of TAIC, 25 parts of foaming agent, 0.05 0.2 parts of zinc oxide, 15 parts of lubricant, 0.05 0.2 parts of nucleating agent.The present invention is modified to homopolymerization PP using micro- crosslinked principle and the method for preparing foaming plate, and obtained foaming plate compatibility is good, flexibility is strong, impact strength is higher.
Description
Technical field
The present invention relates to technical field of polymer materials, and in particular to a kind of PP and PE alloy structures foaming plate and its system
Preparation Method.
Background technology
Polypropylene (Polypropylene, abbreviation PP) is a kind of hemicrystalline thermoplastic.Since it is with higher
Impact resistance, engineering properties is tough, resist a variety of organic solvents and acid and alkali corrosion excellent performance, be widely used in chemical industry,
The fields such as building, Medical Devices are relatively common one of high molecular materials.But become fragile when PP low temperature, cold tolerance is poor, system
Product shrinking percentage is big, poor dimensional stability, and weather resistance is poor；And due to the nonpolarity of its strand, antistatic property and with
The poor compatibility of other polar polymers, inorganic matter.
In the prior art, in order to improve the comprehensive performance of PP, usually PP is modified, and the method that PP is modified has very
It is more, chemical modification and physical modification can be divided into according to the variation of structure.Chemical modification is by the methods of being copolymerized, being grafted at PP points
Other functional groups, short-chain branch, long-chain branch etc. are introduced in subchain, or carry out cross-linking modified, cross-linking modified energy by the way that crosslinking agent is added
Improve the stability of the accumulation shape of macromolecular chain, improves mechanical property, heat resistance, resistance to deformation nature, melt strength, it is conventional
PP cross-linking methods have the methods of peroxide crosslinking, nitride crosslinking, crosslinking with radiation, heat cross-linking.It can be obtained after PP crosslinkings
Higher hardness, preferable solvent resistance and excellent resistance to low temperature.
PE is added in PP, the flexibility and extensibility of PP can be improved.Since the strand of PP and PE is nonpolarity,
The compatibility of the two is very poor, it is difficult to be blended together.In the prior art, in order to solve the problems, such as difficult mixing, Malaysia is generally used
Acid anhydrides or silane coupling agent are as cosolvent, to make two kinds of material compatibles of PP and PE, but this compatible only improve
The molecular chain structure of the surface polarity of macromolecular mass, two kinds of materials is still independent, is not crosslinked, cause the compatibility performance of product according to
It is so poor.
Invention content
In view of the above problems, the present invention provides, a kind of compatibility is good, flexibility is strong, impact strength higher PP and PE are closed
Golden constructional foaming plank, and homopolymerization PP is modified using micro- crosslinked principle and the method for preparing foaming plate.
To achieve the above object, the present invention solves by the following technical programs：
A kind of PP and PE alloy structure foaming plates, include the component of following parts by weight：50-75 parts of homopolymerization PP, LDPE
20-40 parts, 0.0005-0.002 parts of DCP, 0.01-0.05 parts of HDDA, 0.01-0.06 parts of DVB, 0.01-0.1 parts of TAIC,
2-5 parts of foaming agent, 0.05-0.2 parts of zinc oxide, 1-5 parts of lubricant, 0.05-0.2 parts of nucleating agent.
Specifically, the foaming agent is one kind in modified sodium bicarbonate foaming agent, TSH, OBSH.
Specifically, the lubricant is the mixture of one or more of PE waxes, microcrystalline wax, chlorinated paraffin.
A kind of preparation method of PP and PE alloy structure foaming plates, includes the following steps：
Step 1：Following component is weighed by weight：50-75 parts of homopolymerization PP, 20-40 parts of LDPE, DCP 0.0005-
0.002 part, 0.01-0.05 parts of HDDA, 0.01-0.06 parts of DVB, 0.01-0.1 parts of TAIC, 2-5 parts of foaming agent, zinc oxide
0.05-0.2 parts, 1-5 parts of PE waxes, 0.05-0.2 parts of nucleating agent；
Step 2：By the homopolymerization PP weighed in step 1, LDPE, zinc oxide, lubricant, DCP, HDDA, DVB, TAIC,
Foaming agent, nucleating agent, which are added in screw extruder, to be uniformly mixed and is plasticized；
Step 3：By the mixture obtained in step 2 by die pressure cavity, being forced into 7-20MPa and keeping 3-
12min obtains high-foaming material after decompression foaming；
Step 4：High-foaming material obtained above is passed through into roller roll-forming, foamed board is obtained after being cooled to room temperature
Material.
Specifically, the screw extruder in the step 2 is double screw extruder, temperature setting is 150-165 DEG C.
Specifically, the decompression foamed time in the step 3 is 3-12 minutes, temperature is 150-190 DEG C.
Specifically, the thickness of foaming plate is 1-8mm in the step 4.
The beneficial effects of the invention are as follows：
The first, homopolymerization PP has higher impact resistance, resistance to water soak, antiacid caustic corrosion, antilysis, mechanicalness
It is excellent that matter is tough, but it is more crisp when its low temperature, flexibility is poor, the introducing portion LDPE in homopolymerization PP, homopolymerization PP and LDPE shapes
At micro- crosslinking, the low-temperature stability and flexibility of homopolymerization PP can be improved；
The second, homopolymerization PP is reacted with crosslinking agent DVB, HDDA and function additive DCP, introduces corresponding functional group, is increased
The strong impact strength of homopolymerization PP；
Third, 2-6 times that the expansion ratio through foaming plate made from this formula and method is routine, are formed by abscess
Larger, steep that wall is thicker, and bending strength is higher；
4th, PP and the PE alloy structure foaming plate compatibilities that prepare of the present invention are good, flexibility by force, impact strength compared with
It is high.
Specific implementation mode
In order to further appreciate that the feature, technological means and the specific purposes reached, function of the present invention, tie below
Closing specific implementation mode, the present invention is described in further detail.
Reaction principle：
The first step：Homopolymerization PP (polypropylene) is under the action of peroxide DCP (cumyl peroxide), in strand
Part methyl key fracture, saturation state is not achieved in the carbon atom outermost electron layer of breaking part, unstable；
Second step：LDPE (low density polyethylene (LDPE)) is connect with the carbon atom at portion fractures in a manner of covalent bond, to
Homopolymerization PP forms micro- crosslinking with LDPE；
Third walks：HDDA (1,6- hexylene glycol double methacrylate), DVB (divinylbenzene) are reacted with homopolymerization PP, to draw money on credit
The mode of chain is connected in homopolymerization PP strand, to introduce the functional group of HDDA and DVB.
Embodiment 1：
A kind of PP and PE alloy structure foaming plates, include the component of following parts by weight：60 parts of homopolymerization PP, LDPE
34.699 parts, 0.001 part of DCP, 0.02 part of HDDA, 0.03 part of DVB, 0.05 part of TAIC, modified sodium bicarbonate foaming agent 2
Part, 0.1 part of zinc oxide, 3 parts of PE waxes, 0.1 part of nucleating agent.
A kind of preparation method of PP and PE alloy structure foaming plates, includes the following steps：
Step 1：Following component is weighed by weight：60 parts of homopolymerization PP, 34.699 parts of LDPE, 0.001 part of DCP,
0.02 part of HDDA, 0.03 part of DVB, 0.05 part of TAIC, modified 2 parts of sodium bicarbonate foaming agent, 0.1 part of zinc oxide, 3 parts of PE waxes,
0.1 part of nucleating agent；
Step 2：By the homopolymerization PP weighed in step 1, LDPE, zinc oxide, lubricant, DCP, HDDA, DVB, TAIC,
Foaming agent, nucleating agent, which are added in screw extruder, to be uniformly mixed and is plasticized, and temperature setting is 150-165 DEG C；
Step 3：By the mixture obtained in step 2 by die pressure cavity, being forced into 7-20MPa and keeping 3-
12min, decompression foaming, decompression foamed time are 3-12 minutes, and temperature is 150-190 DEG C, obtains high-foaming material；
Step 4：High-foaming material obtained above is passed through into roller roll-forming, foamed board is obtained after being cooled to room temperature
Material.
Preferably, the present invention can be 1-8mm according to the foaming plate for requiring to prepare various thickness, optimal thickness range,
The thickness of the foaming plate obtained in step 4 in the present embodiment is 8mm, does not represent unique thickness size.
Embodiment 2：
A kind of PP and PE alloy structure foaming plates, include the component of following parts by weight：65 parts of homopolymerization PP, LDPE
29.699 parts, 0.001 part of DCP, 0.02 part of HDDA, 0.03 part of DVB, 0.05 part of TAIC, modified sodium bicarbonate foaming agent 2
Part, 0.1 part of zinc oxide, 3 parts of PE waxes, 0.1 part of nucleating agent.
A kind of preparation method of PP and PE alloy structure foaming plates, includes the following steps：
Step 1：Following component is weighed by weight：65 parts of homopolymerization PP, 29.699 parts of LDPE, 0.001 part of DCP,
0.02 part of HDDA, 0.03 part of DVB, 0.05 part of TAIC, modified 2 parts of sodium bicarbonate foaming agent, 0.1 part of zinc oxide, 3 parts of PE waxes,
0.1 part of nucleating agent；
Step 2：By the homopolymerization PP weighed in step 1, LDPE, zinc oxide, lubricant, DCP, HDDA, DVB, TAIC,
Foaming agent, nucleating agent, which are added in screw extruder, to be uniformly mixed and is plasticized, and temperature setting is 150-165 DEG C；
Step 3：By the mixture obtained in step 2 by die pressure cavity, being forced into 7-20MPa and keeping 3-
12min, decompression foaming, decompression foamed time are 3-12 minutes, and temperature is 150-190 DEG C, obtains high-foaming material；
Step 4：High-foaming material obtained above is passed through into roller roll-forming, foamed board is obtained after being cooled to room temperature
Material.
Preferably, the present invention can be 1-8mm according to the foaming plate for requiring to prepare various thickness, optimal thickness range,
The thickness of the foaming plate obtained in step 4 in the present embodiment is 8mm, does not represent unique thickness size.
Embodiment 3：
A kind of PP and PE alloy structure foaming plates, include the component of following parts by weight：70 parts of homopolymerization PP, LDPE
24.599 parts, 0.001 part of DCP, 0.02 part of HDDA, 0.03 part of DVB, 0.05 part of TAIC, modified sodium bicarbonate foaming agent 2
Part, 0.1 part of zinc oxide, 3 parts of PE waxes, 0.2 part of nucleating agent.
A kind of preparation method of PP and PE alloy structure foaming plates, includes the following steps：
Step 1：Following component is weighed by weight：70 parts of homopolymerization PP, 24.599 parts of LDPE, 0.001 part of DCP,
0.02 part of HDDA, 0.03 part of DVB, 0.05 part of TAIC, modified 2 parts of sodium bicarbonate foaming agent, 0.1 part of zinc oxide, 3 parts of PE waxes,
0.2 part of nucleating agent；
Step 2：By the homopolymerization PP weighed in step 1, LDPE, zinc oxide, lubricant, DCP, HDDA, DVB, TAIC,
Foaming agent, nucleating agent, which are added in screw extruder, to be uniformly mixed and is plasticized, and temperature setting is 150-165 DEG C；
Step 3：By the mixture obtained in step 2 by die pressure cavity, being forced into 7-20MPa and keeping 3-
12min, decompression foaming, decompression foamed time are 3-12 minutes, and temperature is 150-190 DEG C, obtains high-foaming material；
Step 4：High-foaming material obtained above is passed through into roller roll-forming, foamed board is obtained after being cooled to room temperature
Material.
Preferably, the present invention can be 1-8mm according to the foaming plate for requiring to prepare various thickness, optimal thickness range,
The thickness of the foaming plate obtained in step 4 in the present embodiment is 8mm, does not represent unique thickness size.
Comparative example 1：
The homopolymerization PP foaming plate of common commercially available 8mm thickness.
The foaming plate that above-described embodiment 1 to 3 and comparative example 1 are obtained carries out quantitative measurement, obtained result
As shown in table 1 below.
| Project | Embodiment 1 | Embodiment 2 | Embodiment 3 | Comparative example 1 |
| Proportion (g/cm3) | 0.45 | 0.3 | 0.2 | 0.6 |
| Abscess aperture (mm) | 0.12-0.80 | 0.15-0.80 | 0.16-0.80 | 0.02-0.30 |
| Pore wall thickness (mm) | 0.0018-0.030 | 0.0016-0.021 | 0.0011-0.025 | 0.0012-0.0021 |
| Specific stiffness (MPa (g/cm3)-1) | 145.3 | 141.7 | 137.5 | 35.6 |
| Falling ball impact strength (J/m) | 261.5 | 244.3 | 201.6 | 55.7 |
Data in observation analysis table 1, by the parameters in comparative example 1-3 and comparative example 1, in equal volume
Under, the foaming plate that embodiment 1-3 is obtained reduces 2-3 times than the proportion of the homopolymerization PP foaming plate of comparative example 1, illustrates this hair
Bright foaming plate light weight obtained；The foaming plate abscess pore size of embodiment 1-3 is 0.12-0.80mm, pore wall thickness
For 0.0011-0.030mm, and the homopolymerization PP foaming plate abscess pore size of comparative example 1 is 0.02-0.30mm, pore wall thickness
For 0.0012-0.0021mm, illustrate that the expansion ratio of foaming plate made from formula of the invention and method is high, the abscess of formation
Aperture is big, hole wall is thicker.
Observe the bending strength and Falling ball impact strength data in table 1, foaming plate made from three embodiments compared to pair
The homopolymerization PP foaming plate of ratio, specific stiffness improve 4 times, and Falling ball impact strength is improved close to 5 times, illustrates preparation of the present invention
Foaming plate flexibility is strong, impact strength is higher.
Three kinds of embodiments of the invention above described embodiment only expresses, the description thereof is more specific and detailed, but simultaneously
Cannot the limitation to the scope of the claims of the present invention therefore be interpreted as.It should be pointed out that for those of ordinary skill in the art
For, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to the guarantor of the present invention
Protect range.Therefore, the protection domain of patent of the present invention should be determined by the appended claims.
Claims (7)
1. a kind of PP and PE alloy structure foaming plates, which is characterized in that include the component of following parts by weight：Homopolymerization PP 50-75
Part, 20-40 parts of LDPE, 0.0005-0.002 parts of DCP, 0.01-0.05 parts of HDDA, 0.01-0.06 parts of DVB, TAIC
0.01-0.1 parts, 2-5 parts of foaming agent, 0.05-0.2 parts of zinc oxide, 1-5 parts of lubricant, 0.05-0.2 parts of nucleating agent.
2. a kind of PP according to claim 1 and PE alloy structure foaming plates, which is characterized in that the foaming agent is to change
One kind in property sodium bicarbonate foaming agent, TSH, OBSH.
3. a kind of PP according to claim 1 and PE alloy structure foaming plates, which is characterized in that the lubricant is PE
The mixture of one or more of wax, microcrystalline wax, chlorinated paraffin.
4. the preparation method of a kind of PP and PE alloy structure foaming plates, which is characterized in that include the following steps：
Step 1：Following component is weighed by weight：50-75 parts of homopolymerization PP, 20-40 parts of LDPE, DCP 0.0005-0.002
Part, HDDA0.01-0.05 parts, 0.01-0.06 parts of DVB, 0.01-0.1 parts of TAIC, 2-5 parts of foaming agent, zinc oxide 0.05-0.2
Part, 1-5 parts of PE waxes, 0.05-0.2 parts of nucleating agent；
Step 2：By the homopolymerization PP weighed in step 1, LDPE, zinc oxide, lubricant, DCP, HDDA, DVB, TAIC, foaming
Agent, nucleating agent, which are added in screw extruder, to be uniformly mixed and is plasticized；
Step 3：By the mixture obtained in step 2 by die pressure cavity, being forced into 7-20MPa and keeping 3-
12min obtains high-foaming material after decompression foaming；
Step 4：High-foaming material obtained above is passed through into roller roll-forming, foaming plate is obtained after being cooled to room temperature.
5. the preparation method of a kind of PP according to claim 4 and PE alloy structure foaming plates, which is characterized in that described
Screw extruder in step 2 is double screw extruder, and temperature setting is 150-165 DEG C.
6. the preparation method of a kind of PP according to claim 4 and PE alloy structure foaming plates, which is characterized in that described
Decompression foamed time in step 3 is 3-12 minutes, and temperature is 150-190 DEG C.
7. the preparation method of a kind of PP according to claim 4 and PE alloy structure foaming plates, which is characterized in that described
The thickness of foaming plate is 1-8mm in step 4.
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| CN201810232749.7A CN108329597A (en) | 2018-03-21 | 2018-03-21 | A kind of PP and PE alloy structure foaming plates and preparation method thereof |
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| CN201810232749.7A CN108329597A (en) | 2018-03-21 | 2018-03-21 | A kind of PP and PE alloy structure foaming plates and preparation method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110734606A (en) * | 2019-10-22 | 2020-01-31 | 惠州市峄董塑胶科技有限公司 | high-tensile-strength braided plate |
| CN115160672A (en) * | 2022-04-12 | 2022-10-11 | 张瑞洋 | HDPE (high-density polyethylene) and LDPE (low-density polyethylene) blended foaming sheet material and production method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2000000520A1 (en) * | 1998-06-19 | 2000-01-06 | Borealis A/S | Foamed polypropylene |
| CN1944032A (en) * | 2005-10-09 | 2007-04-11 | 赖彪 | Method for producing polypropylene foamed sheet |
| CN102276923A (en) * | 2011-08-29 | 2011-12-14 | 成都市新津事丰医疗器械有限公司 | Foamed polypropylene material |
| CN103642106A (en) * | 2013-10-09 | 2014-03-19 | 湖北工业大学 | Regenerated polyolefin/plant fibre composite foaming material and preparation method therefor |
-
2018
- 2018-03-21 CN CN201810232749.7A patent/CN108329597A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2000000520A1 (en) * | 1998-06-19 | 2000-01-06 | Borealis A/S | Foamed polypropylene |
| CN1944032A (en) * | 2005-10-09 | 2007-04-11 | 赖彪 | Method for producing polypropylene foamed sheet |
| CN102276923A (en) * | 2011-08-29 | 2011-12-14 | 成都市新津事丰医疗器械有限公司 | Foamed polypropylene material |
| CN103642106A (en) * | 2013-10-09 | 2014-03-19 | 湖北工业大学 | Regenerated polyolefin/plant fibre composite foaming material and preparation method therefor |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110734606A (en) * | 2019-10-22 | 2020-01-31 | 惠州市峄董塑胶科技有限公司 | high-tensile-strength braided plate |
| CN115160672A (en) * | 2022-04-12 | 2022-10-11 | 张瑞洋 | HDPE (high-density polyethylene) and LDPE (low-density polyethylene) blended foaming sheet material and production method thereof |
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Application publication date: 20180727 |