CN103450596A - Recycling process for waste cable material - Google Patents
Recycling process for waste cable material Download PDFInfo
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- CN103450596A CN103450596A CN2013103850840A CN201310385084A CN103450596A CN 103450596 A CN103450596 A CN 103450596A CN 2013103850840 A CN2013103850840 A CN 2013103850840A CN 201310385084 A CN201310385084 A CN 201310385084A CN 103450596 A CN103450596 A CN 103450596A
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- Prior art keywords
- waste
- cable materials
- pvc
- wood
- cable material
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/92—Measuring, controlling or regulating
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
- B29C48/395—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders
- B29C48/40—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using screws surrounded by a cooperating barrel, e.g. single screw extruders using two or more parallel screws or at least two parallel non-intermeshing screws, e.g. twin screw extruders
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92504—Controlled parameter
- B29C2948/9258—Velocity
- B29C2948/9259—Angular velocity
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92504—Controlled parameter
- B29C2948/92704—Temperature
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92819—Location or phase of control
- B29C2948/92857—Extrusion unit
- B29C2948/92876—Feeding, melting, plasticising or pumping zones, e.g. the melt itself
- B29C2948/92885—Screw or gear
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92819—Location or phase of control
- B29C2948/92857—Extrusion unit
- B29C2948/92876—Feeding, melting, plasticising or pumping zones, e.g. the melt itself
- B29C2948/92895—Barrel or housing
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Dry Formation Of Fiberboard And The Like (AREA)
Abstract
The invention discloses a recycling process for a waste cable material. The recycling process comprises the following steps: (1) pre-processing raw material, namely shearing washed waste PVC (Polyvinyl Chloride) cable material, putting the PVC cable material into a pulverizer and repeatedly pulverizing for three times, then sieving the pulverized PVC cable material through a 100-mesh sieve, drying the PVC cable material for future use, and drying wood powder at 150 DEG C for 2 hours for future use; (2) mixing the PVC cable material dried and pulverized in the step (1) with the wood powder and other components in the preparation according to a certain ratio in a high-speed mixer for 5 minutes to obtain the uniformly mixed raw material; and (3) putting the raw material mixed uniformly in the step (2) into a twin-screw extruder, adjusting the temperature to be 140-170 DEG C, adjusting the screw rotation speed at 20-50r/min, fusing, mixing and extruding to obtain wood plastic composite. The recycling process disclosed by the invention is easy to realize and control; serving as an economical, practical and environment-friendly process route, the recycling process is capable of recycling waste cable material and has the advantages of good economic benefit and environmental significance.
Description
Technical field
The present invention relates to salvage material and re-use, in particular to a kind of waste and old CABLE MATERIALS, re-use technique.
Background technology
Along with industrial develop rapidly, plastics are more and more in the industry-by-industry field, are accompanied by the expansion of plastics-production and application, also brought the problem of plastic pollution environment.Along with the development of organic polymer material regenerative use technology, increasing technics of reclaim of plastic waste recycling process quilt is applied in this field, has solved on the one hand problem of environmental pollution, and resource has been saved in recycling on the one hand.In numerous plastics reutilization technologies, waste and old CABLE MATERIALS reutilization technology is an important aspect.
It is to adopt dissolution method that waste and old cable material crust reclaims traditional method, be dissolved in appropriate solvent, then add other additives and make floor, tubing etc., but this method technique is numerous and diverse, and the organic solvent be designed into is all generally the solvent containing benzene, unfriendly to environment.Develop that simple, easy to operate and difficult to environment, to cause the waste and old cable material of secondary pollution to re-use technique be that current line needs in the industry the major issue solved.
Summary of the invention
The invention solves deficiency of the prior art, a kind of crosslinking polyethylene-insulated cable insulation material of the 110KV of can be used for high pressure is provided.
Technical scheme of the present invention is: a kind of waste and old CABLE MATERIALS re-uses technique, it is characterized in that, comprises the following steps:
(1) raw materials pretreatment: shred and put into pulverizer and repeat to pulverize three times cleaning waste and old PVC CABLE MATERIALS later, then the PVC CABLE MATERIALS of pulverizing is crossed to 100 mesh sieves, and dry for standby; Again wood powder is dried 2 hours under 150 ℃, standby;
(2) by other components in PVC CABLE MATERIALS, wood powder and the formula of the pulverizing of drying in step (1) according to a certain percentage, high-speed mixer and mixing 5 minutes, the raw material that obtains mixing;
(3) raw material mixed in step (2) is put into to twin screw extruder, temperature regulation to 140～170 ℃, screw speed is 20～50r/min, melting, mixing, extrude and obtain Wood-plastic material.
Preferably, also comprise step (4), by extruding in step (3), the Wood-plastic material obtained is mixing at the temperature of 140～160 ℃ in mixing roll, and cutting obtains the sheet Wood-plastic material.
Preferably, also comprise step (5), by the sheet Wood-plastic material of preparation in step (4), in hydropress, compressing tablet, make Wood plastic boards.
Preferably, formula described in step (2), according to the weight fraction meter, comprising: 40～90 parts of waste PVC CABLE MATERIALS, and 0～50 part of wood powder, 0～40 part of pure PVC powder, 1～3 part of one package stabilizer, 0～10 part of coupling agent, 1～2 part of lubricant, surplus is other auxiliary agents.
Preferably, described one package stabilizer is one or more mixtures in calcium stearate, ricinolic acid calcium, Zinic stearas and zinc ricinate.
Preferably, described coupling agent is titanate coupling agent.
Preferably, described lubricant is paraffin or metallic soap.
Preferably, described auxiliary agent comprises esters of acrylic acid PVC modifier or oxidation inhibitor.
The defect that solves prior art of the present invention has following beneficial effect:
1. in technique of the present invention, the PVC CABLE MATERIALS pulverized and wood powder etc. have all been carried out to drying and processing, and temperature is no more than 150 ℃, these starting material are carried out to the quality that drying and processing can improve the Wood-plastic material of final preparation, because undried wood powder can cause material and bubble, if bake out temperature is too high, also can burn because of wood powder, so control temperature and important in technique.
2. added a certain amount of coupling agent in technique of the present invention, coupling agent has modifying function to wood powder, the degree of its surface polarity of wood powder after modification has reduced, so just can not hinder hydrophilic filler and the dispersiveness between thermoplastic material and surperficial binding property, greatly improve the composite performance of Wood-plastic material.
3. add lubricant in formula of the present invention, because the force of cohesion of the matrix PVC material of technique is large, poor fluidity, be not easy to processing, added the processing characteristics that lubricant has improved material, improved thermostability.
4. in the waste and old CABLE MATERIALS re-using technique in the present invention, the processing parameter of twin screw extruder is: temperature is 140～170 ℃, screw speed is 20～50r/min, the quality product made in this process parameters range is best, because if the rotating speed of screw rod is lower, yields poorly; If the rotating speed of screw rod is higher, product surface is coarse.Extrusion temperature can not be higher than 170 ℃, if surpass 170 ℃, the wood powder in formula is understood coking, affects the quality of goods, if temperature is too low, the product extrusion moulding is also had to serious impact.
5. the technique the present invention relates to easily realizes controlling, and is a kind of economical and practical environment-protective process route, can realize that waste and old CABLE MATERIALS re-uses, and has good economic benefit and environment protection significance.
Embodiment
In order to make those skilled in the art person understand better the present invention, and above-mentioned advantage of the present invention can be become apparent more, below in conjunction with specific embodiment, the present invention is further detailed explanation.
embodiment 1-3
(1) crust of waste and old PVC CABLE MATERIALS is peeled off, shredded, clean up, pulverize three times in pulverizer, cross 100 mesh sieves, remove larger particle, then dry 1 hour under 90 ± 5 ℃, standby;
Wood powder is crossed to 100 mesh sieves, then dry under 150 ℃, remove moisture and other volatile component in wood powder, be conducive to like this improve the stability of wood powder in system;
Pure PVC particle is crossed to 100 mesh sieves, dry 1 hour under 90 ± 5 ℃, standby;
(2) by step (1), sieve and dry rear pulverizing waste PVC CABLE MATERIALS, wood powder and pure PVC particle and the formula in other components according to the ratio in formula table 1, take, put into high-speed mixer and mixing 5 minutes, rotating speed is 4500r/min, the raw material that obtains mixing;
(3) raw material mixed in step (2) is put into to twin screw extruder, temperature regulation to 140～170 ℃, screw speed is 20～50r/min, melting, mixing, extrude and obtain Wood-plastic material.Will control screw speed and temperature in this one, these two processing parameters have important impact to product property, if the rotating speed of screw rod is lower, yield poorly; If the rotating speed of screw rod is higher, product surface is coarse.Extrusion temperature can not be higher than 170 ℃, if surpass 170 ℃, the wood powder in formula is understood coking, affects the quality of goods, if temperature is too low, the product extrusion moulding is also had to serious impact;
(4) mixing at the temperature of 140～160 ℃ in mixing roll by extruding the Wood-plastic material obtained in step (3), cutting obtains the sheet Wood-plastic material;
(5) by the sheet Wood-plastic material of preparation in step (4) in hydropress, compressing tablet, make Wood plastic boards, can be directly with the sheet material made, the waste PVC CABLE MATERIALS be re-used to the Wood-plastic material that technique make and carry out performance test.
comparative Examples 1
Consistent with in embodiment 2 of other component in formula, matrix resin is pure PVC, production and processing technology is consistent with in embodiment also.
comparative Examples 2
Consistent with in embodiment 2 of other component in formula, matrix resin is all the waste PVC CABLE MATERIALS, production and processing technology is consistent with in embodiment also.
comparative Examples 3
In full accord in component in formula and embodiment 2, in preparation technology, the temperature of twin screw extruder >=180 ℃, other processing parameter is with consistent in embodiment 2.In this Comparative Examples, temperature, in the time of >=180 ℃, can arrange several thermogrades more, as 180 ℃, and 185 ℃, 190 ℃ etc.
comparative Examples 4
In full accord in component in formula and embodiment 2, in preparation technology, the rotating speed of double-screw extruder screw >=55 r/min, other processing parameter is with consistent in embodiment 2.In this Comparative Examples, during the rotating speed of screw rod >=55 r/min, several gradients can be set more, as 55 r/min, 60 r/min, 65 r/min etc.
The calcium stearate the present invention relates to, ricinolic acid calcium, Zinic stearas, zinc ricinate, titanate coupling agent, paraffin, metallic soap, esters of acrylic acid PVC modifier and oxidation inhibitor etc. are all the products be easy to get on market in industry.
performance test
(1) Wood-plastic material of preparation carried out to the tensile property test, testing tool is omnipotent test machine for mechanism, and testing standard is GB/T1040-1992, and the result that test obtains is the mean value of 5 samples.Tensile strength refers to the testing of materials is applied to axial tensile force, until the maximum pull that in the sample fracture process, sample can bear.
(2) Wood-plastic material of preparation carried out to the impact test, testing standard is GB/T1843-1996, and testing tool is impact tester for simple supported beam.
In embodiment 1-3, the component in formula is in full accord, the content difference of component, complete processing is also identical, have test data in table 2 to find out, the over-all properties data of embodiment 2 are all best, because in embodiments of the invention, embodiment 2 is most preferred embodiment.
Embodiment 1-3 and Comparative Examples 1 contrast: the over-all properties data of Comparative Examples 1 slightly are better than the integrated data in embodiment 2, but be more or less the same, the performance gap that Wood-plastic material prepared by the Wood-plastic material for preparing by the waste PVC CABLE MATERIALS and pure PVC is described is little, and Wood-plastic material prepared by the waste PVC CABLE MATERIALS can meet product demand, for environmental factors and cost-saving factor, can utilize interpolation waste PVC CABLE MATERIALS to prepare Wood-plastic material fully.
Embodiment 1-3 does contrast with contrast 2, tensile strength in contrast 2 only has 2.0 MPa, elongation at break only has 30%, its tensile property and shock resistance are more than difference in embodiment 1-3, explanation is in re-using the technical recipe of waste PVC, and appropriate to add pure polyvinyl chloride resin be that material property to preparation has great effect.This is because long-term the exposing to the weather of waste and old PVC CABLE MATERIALS process, DeR may occur in polyvinyl chloride resin under the effect of illumination and air, the physicochemical property of resin matrix descends, and adds pure polyvinyl chloride resin and can make up these disappearances, contributes to improve the mechanical property of material.
Comparative Examples 3 and embodiment 1-3 contrast, in Comparative Examples 3, Wood-plastic material surface irregularity and the blackening of preparation, do Mechanics Performance Testing to it, almost there is no tensile strength.Comparative Examples 4 and embodiment 1-3 contrast, the Wood-plastic material of Comparative Examples 4 preparations has the PVC particle powder of not plasticizing to exist, and is easy to pull apart.The temperature of twin screw extruder and screw speed have larger impact to the quality of preparing product.In embodiment 1-3, temperature is 140～170 ℃, and screw speed is 20～50r/min, and the quality product made in this process parameters range is best, because if the rotating speed of screw rod is lower, yields poorly; If the rotating speed of screw rod is higher, product surface is coarse.Extrusion temperature can not be higher than 170 ℃, if surpass 170 ℃, the wood powder in formula is understood coking, affects the quality of goods, if temperature is too low, the product extrusion moulding is also had to serious impact.
The above; be only the specific embodiment of the present invention, protection scope of the present invention is not limited to this, anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; the variation that can expect easily or replacement, within all should being encompassed in protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection domain that claim was defined.
Table 1 formula table unit (weight fraction)
| Component | Embodiment 1 | Embodiment 2 | Embodiment 3 | Comparative Examples 1 | Comparative Examples 2 |
| Waste PVC | 40 | 50 | 60 | 0 | 60 |
| Wood powder | 40 | 30 | 20 | 30 | 30 |
| Pure PVC | 10 | 10 | 10 | 60 | 0 |
| One package stabilizer | 1 | 2 | 2 | 2 | 2 |
| Coupling agent | 7 | 5 | 6 | 5 | 5 |
| Lubricant | 1 | 1 | 1 | 1 | 1 |
| Other auxiliary agent | 1 | 1 | 1 | 1 | 1 |
Table 2 the performance test results
| ? | Embodiment 1 | Embodiment 2 | Embodiment 3 | Comparative Examples 1 | Comparative Examples 2 |
| Tensile strength (MPa) | 7.0 | 9.0 | 5.0 | 10.0 | 2.0 |
| Elongation at break (%) | 80 | 110 | 90 | 120 | 30 |
Claims (8)
1. a waste and old CABLE MATERIALS re-uses technique, it is characterized in that, comprises the following steps:
(1) raw materials pretreatment: shred and put into pulverizer and repeat to pulverize three times cleaning waste and old PVC CABLE MATERIALS later, then the PVC CABLE MATERIALS of pulverizing is crossed to 100 mesh sieves, and dry for standby; Again wood powder is dried 2 hours under 150 ℃, standby;
(2) by other components in PVC CABLE MATERIALS, wood powder and the formula of the pulverizing of drying in step (1) according to a certain percentage, high-speed mixer and mixing 5 minutes, the raw material that obtains mixing;
(3) raw material mixed in step (2) is put into to twin screw extruder, temperature regulation to 140～170 ℃, screw speed is 20～50r/min, melting, mixing, extrude and obtain Wood-plastic material.
2. a kind of waste and old CABLE MATERIALS according to claim 1 re-uses technique, it is characterized in that, also comprise step (4), by extruding in step (3), the Wood-plastic material obtained is mixing at the temperature of 140～160 ℃ in mixing roll, and cutting obtains the sheet Wood-plastic material.
3. a kind of waste and old CABLE MATERIALS according to claim 2 re-uses technique, it is characterized in that, also comprise step (5), by the sheet Wood-plastic material of preparation in step (4), in hydropress, compressing tablet, make Wood plastic boards.
4. a kind of waste and old CABLE MATERIALS according to claim 1 re-uses technique, it is characterized in that, described in step (2), formula, according to the weight fraction meter, comprising: 40～90 parts of waste PVC CABLE MATERIALS, 0～50 part of wood powder, 0～40 part of pure PVC powder, 1～3 part of one package stabilizer, 0～10 part of coupling agent, 1～2 part of lubricant, surplus is other auxiliary agents.
5. a kind of waste and old CABLE MATERIALS according to claim 4 re-uses technique, it is characterized in that, described one package stabilizer is one or more mixtures in calcium stearate, ricinolic acid calcium, Zinic stearas and zinc ricinate.
6. a kind of waste and old CABLE MATERIALS according to claim 4 re-uses technique, it is characterized in that, described coupling agent is titanate coupling agent.
7. a kind of waste and old CABLE MATERIALS according to claim 4 re-uses technique, it is characterized in that, described lubricant is paraffin or metallic soap.
8. a kind of waste and old CABLE MATERIALS according to claim 4 re-uses technique, it is characterized in that, described auxiliary agent comprises esters of acrylic acid PVC modifier or oxidation inhibitor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013103850840A CN103450596A (en) | 2013-08-30 | 2013-08-30 | Recycling process for waste cable material |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013103850840A CN103450596A (en) | 2013-08-30 | 2013-08-30 | Recycling process for waste cable material |
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| CN103450596A true CN103450596A (en) | 2013-12-18 |
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| CN2013103850840A Pending CN103450596A (en) | 2013-08-30 | 2013-08-30 | Recycling process for waste cable material |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103739871A (en) * | 2013-12-26 | 2014-04-23 | 青岛福创环境科技有限公司 | Method for separating polyvinyl chloride plastics from mixed waste plastics |
| CN104550101A (en) * | 2014-11-20 | 2015-04-29 | 浙江万马高分子材料有限公司 | Washing method for ultrahigh-voltage cable materials |
| CN108129776A (en) * | 2018-01-08 | 2018-06-08 | 安徽以诺木塑板材科技有限公司 | A kind of novel wood-plastic composite board material and preparation method thereof |
| CN111440405A (en) * | 2020-05-22 | 2020-07-24 | 江苏爱特恩高分子材料有限公司 | Preparation method of waste cable sheath modified wood powder composite material |
| CN111484726A (en) * | 2020-05-22 | 2020-08-04 | 江苏爱特恩高分子材料有限公司 | Preparation method of waste cable sheath modified polyurethane glass fiber reinforced plastic composite material |
| CN113429708A (en) * | 2021-07-27 | 2021-09-24 | 国网河南省电力公司内乡县供电公司 | Electric flame-retardant partition plate and preparation process thereof |
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| CN1482166A (en) * | 2002-12-23 | 2004-03-17 | 北京欧尼克环保技术有限公司 | Wood plastic composite material and method for producing the same, method for producing panel and sheet made of wood plastic composite |
| CN1810886A (en) * | 2006-02-27 | 2006-08-02 | 赵桂旭 | Wood powder plastic board and its production process |
| CN101275003A (en) * | 2008-04-30 | 2008-10-01 | 天津大学 | Formula and method for producing wood-plastic composite material with waste polyvinyl chloride cable |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1482166A (en) * | 2002-12-23 | 2004-03-17 | 北京欧尼克环保技术有限公司 | Wood plastic composite material and method for producing the same, method for producing panel and sheet made of wood plastic composite |
| CN1810886A (en) * | 2006-02-27 | 2006-08-02 | 赵桂旭 | Wood powder plastic board and its production process |
| CN101275003A (en) * | 2008-04-30 | 2008-10-01 | 天津大学 | Formula and method for producing wood-plastic composite material with waste polyvinyl chloride cable |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103739871A (en) * | 2013-12-26 | 2014-04-23 | 青岛福创环境科技有限公司 | Method for separating polyvinyl chloride plastics from mixed waste plastics |
| CN103739871B (en) * | 2013-12-26 | 2016-04-13 | 青岛福创环境科技有限公司 | A kind of method of sorting igelite from mixing waste or used plastics |
| CN104550101A (en) * | 2014-11-20 | 2015-04-29 | 浙江万马高分子材料有限公司 | Washing method for ultrahigh-voltage cable materials |
| CN108129776A (en) * | 2018-01-08 | 2018-06-08 | 安徽以诺木塑板材科技有限公司 | A kind of novel wood-plastic composite board material and preparation method thereof |
| CN111440405A (en) * | 2020-05-22 | 2020-07-24 | 江苏爱特恩高分子材料有限公司 | Preparation method of waste cable sheath modified wood powder composite material |
| CN111484726A (en) * | 2020-05-22 | 2020-08-04 | 江苏爱特恩高分子材料有限公司 | Preparation method of waste cable sheath modified polyurethane glass fiber reinforced plastic composite material |
| CN113429708A (en) * | 2021-07-27 | 2021-09-24 | 国网河南省电力公司内乡县供电公司 | Electric flame-retardant partition plate and preparation process thereof |
| CN113429708B (en) * | 2021-07-27 | 2024-03-01 | 国网河南省电力公司内乡县供电公司 | Electric flame-retardant partition board and preparation process thereof |
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Application publication date: 20131218 |