CN104098875A - Continuous fiber-enhanced CBT prepreg, and preparation method and application thereof - Google Patents
Continuous fiber-enhanced CBT prepreg, and preparation method and application thereof Download PDFInfo
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- CN104098875A CN104098875A CN201310120647.3A CN201310120647A CN104098875A CN 104098875 A CN104098875 A CN 104098875A CN 201310120647 A CN201310120647 A CN 201310120647A CN 104098875 A CN104098875 A CN 104098875A
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Abstract
The invention relates to a continuous fiber-enhanced CBT prepreg and a preparation method and application thereof, belonging to the technical field of polymer composites. The continuous fiber-enhanced CBT prepreg is prepared from the following components by weight: 100 parts of a CBT resin, 0 to 0.6 part of a catalyst and 100 to 235 parts of a continuous fiber. According to the invention, the catalyst with low activity is selected, so non-reaction or difficult reaction of the CBT resin with the catalyst in an extruder is realized; a resin extrusion melt impregnation method is used to prepare the continuous fiber-enhanced CBT prepreg, and the method has low energy consumption and poses little pollution to the environment; the prepared prepreg has uniform thickness, high fiber content and a good infiltration effect; and the composite prepared through a cascade reaction has excellent physical properties.
Description
Technical field
The invention belongs to technical field of polymer composite materials, relate to a kind of continuous fibre and strengthen CBT prepreg tape and its preparation method and application.
Background technology
CBT resin, i.e. cyclic butylene terephthalate, CBT is the abbreviation of Cyclic butylenes terephthalate.CBT resin, oligopolymer is generally 2～5 aggressiveness, and due to its unique ring structure feature, its processing viscosity is very low, can reach intimate small molecules liquid water the same, and the dipping that this is extremely easy to fiber and filler, is conducive to production long-range thin-gage goods.According to the difference of catalyzer and temperature of reaction, the complete reaction time can be controlled in tens seconds in dozens of minutes, and can select different catalyst type and temperature of reaction according to the demand of application; In reaction process, there is no the release of chemical substance, is a kind of environment-friendly material, also easily obtains bright and clean surface simultaneously; In reaction process, there is no the generation of reaction heat, be easy to the control of reaction, can prepare large size goods, shorten shaping cycle; Be easy to thermoforming simultaneously, simplified moulding process, shortened process period; The advantages such as PBT, the plastics that polymerization obtains later have that good rigidity, toughness, heat-resisting, resistance to chemical attack, dimensional stability, electrical insulating property are good, fire-retardant, thermoformable, post-treatment are convenient and recycling.
The main shortcoming of general work in-process thermoplastic matrix is its high viscosity, and this has had a strong impact on the dipping of fibre reinforcement, and CBT resin just in time can solve the problem of pre-soaking fiber process medium-high viscosity.The matrix material that continuous fibre enhancing CBT obtains combines the feature of thermoplastics and thermosetting resin, therefore has broad application prospects.As can be made the blade of aerogenerator taking CBT resin as the fibre composite of matrix manufacture, its blade has the advantages such as impact resistance is high, shaping speed fast, price economy.
At present, the conventional method of preparing continuous fibre enhancing CBT matrix material has vacuum assisted resin form (VARI), solvent method and resin film method etc., vacuum assisted resin form is to utilize vacuum pressure that the CBT resin of melting and catalyzer injection mould are infiltrated to fiber or fabric, this method is only suitable for the preparation of small size product, is difficult to realize the preparation of large size product; Solvent method is that CBT resin and catalyzer are all dissolved in solvent, then allows fiber or fabric flood in solution, or by solution spraying on fiber or fabric, then drying, volatilizees solvent completely, but the solvent of volatilization can cause environmental pollution; And resin film method is to utilize blowing or casting method first CBT resin to be prepared into film, then by itself and fiber or the laminating matrix material of preparing of fabric hot melt, film-forming process has increased the input of equipment, has also increased energy consumption.
Summary of the invention
Object of the present invention is exactly to provide a kind of continuous fibre to strengthen CBT prepreg tape and its preparation method and application in order to overcome the defect that above-mentioned prior art exists.
The present invention is in conjunction with existing continuous fiber reinforced thermoplastic resin composite material presoaked belt production unit, select active relatively low catalyzer, utilize resin extruded scorification impregnating continuous fibres, thereby prepare even thickness, fibre content is higher, the prepreg tape of better performances and matrix material thereof.
For achieving the above object, the present invention is by the following technical solutions:
A kind of continuous fibre strengthens cyclic butylene terephthalate (CBT) prepreg tape, is made up of the component that comprises following weight part:
100 parts of cyclic butylene terephthalates,
0～0.6 part of catalyzer,
100～235 parts of continuous fibres.
The content of described catalyzer is 0.2～0.6 part.
Described cyclic butylene terephthalate is cyclic butylene terephthalate, preferably model is CBT100, CBT160 or the CBT200 that Cyclics company of the U.S. produces, wherein CBT100 and CBT200 do not contain catalyzer, the tin class catalyzer that CBT160 contains 0.25% volumetric molar concentration.
Described catalyzer is titanium class catalyzer or tin class catalyzer, preferably four (2-ethyl-1,3-hexylene glycols) close titanium, two (acetylacetone based) metatitanic acid diisopropyl ester, two (methyl aceto acetate) metatitanic acid diisopropyl ester, dihydroxyl dibutyl tin oxide or monobutyl three isocaprylic acid tin.
Described continuous fibre is selected from glass fibre, carbon fiber, boron fibre or basalt fibre.
Above-mentioned continuous fibre strengthens a preparation method for cyclic butylene terephthalate prepreg tape, comprises the following steps:
(1) by even the catalyst mix of dry 100 parts of cyclic butylene terephthalates and 0～0.6 part;
(2) compound in step (1) is extruded through forcing machine, and allow melting cyclic butylene terephthalate resin and 100～235 parts of continuous fibres extruded meet at the staggered two extrusion dies place of forcing machine, realize dipping, then prepreg tape is drawn through cold pressing roller, rolling, obtains flooding continuous fibre completely and strengthens cyclic butylene terephthalate prepreg tape.
In described step (1), the drying conditions of cyclic butylene terephthalate is: dry 8～12h in 80～100 DEG C of baking ovens;
The device mixing in described step (1) is high-speed mixer, and mixing time is 3～7min;
The Preparation equipment (disclosed equipment in patent CN101474868A) that the forcing machine of using in described step (2) is continuous fiber reinforced thermoplastic resin composite material presoaked belt, extruder screw rotating speed is 10～150r/min, melt extruding temperature is 150～190 DEG C, and pulling speed is 2～10m/min.
A kind of matrix material that utilizes above-mentioned continuous fibre enhancing cyclic butylene terephthalate prepreg tape to make.
A preparation method for above-mentioned matrix material, comprises the steps:
Above-mentioned continuous fibre is strengthened to cyclic butylene terephthalate prepreg tape and need to carry out cutting, laying according to reality, hot-forming on vulcanizing press, after colding pressing, take out matrix material, and survey its physicals.
Described hot-forming condition is: 200～240 DEG C of temperature, and pressure is 0～5MPa, the time is 30～90min;
The described pressure of colding pressing is 5MPa, and the time is 30～60min.
Device used in this application be continuous fiber reinforced thermoplastic resin composite material presoaked belt Preparation equipment (its patent publication No. is CN101474868A) in this application, utilize this equipment to prepare continuous fibre and strengthen CBT prepreg tape, not only power consumption is lower, environmental pollution is few, but also can be according to the gel content of extruder screw rotating speed and tractor pulling speed control prepreg tape, can the be controlled at ± 0.02mm of prepreg tape thickness error of preparation, fibre content can be up to more than 70%, and production efficiency is also higher.By fiber reinforcement CBT preimpregnation material lamination as required, mold pressing, thermopolymerization, makes composite finished product, thereby has expanded the Application Areas of CBT resin.
Compared with prior art, the present invention has the following advantages and beneficial effect:
(1) in the present invention, utilize resin extruded melt impregnation legal system to strengthen CBT prepreg tape for continuous fibre, not only power consumption is lower, environmental pollution is few, but also can be according to the gel content of extruder screw rotating speed and tractor pulling speed control prepreg tape, can the be controlled at ± 0.02mm of prepreg tape thickness error of preparation, fibre content can be up to more than 70%, and production efficiency is also higher.
(2) in the present invention, select active relatively low catalyzer, CBT resin and catalyzer are not reacted in forcing machine or difficult reaction as far as possible, prepare the prepreg tape that resin effect of impregnation is good, and prepare preferably matrix material of physicals by staircase response.
Embodiment
Below in conjunction with specific embodiment, the present invention is described in detail.
In following examples, the tensile property of products obtained therefrom is according to standard A STM D3039 test, and bending property is according to standard A STM D7264 test, and interlaminar shear strength is tested according to standard A STM D2344.
Embodiment 1
(1) first by CBT160 dry 12h in 80 DEG C of baking ovens, then get the 100 parts of CBT160 resins (having added the tin class catalyzer of 0.25% volumetric molar concentration) that were dried;
(2) CBT160 resin in step (1) is extruded through forcing machine (patent CN101474868A design), and allow melting CBT160 resin and the 100 parts of basalt fibres extruded meet at staggered two extrusion dies place, realize dipping, then prepreg tape is drawn through cold pressing roller, rolling, can obtain flooding continuous fibre completely and strengthen CBT resin prepreg band, wherein extruder screw rotating speed is 10r/min, melt extruding temperature is: 150 DEG C, a district, two 165 DEG C, districts, three 170 DEG C, districts, four 180 DEG C, districts, five 190 DEG C, districts, 190 DEG C of heads, pulling speed is 2m/min,
(3) above-mentioned prepreg tape need to be carried out to cutting, laying according to reality, hot-forming on vulcanizing press, after colding pressing, take out matrix material, and survey its physicals (in table 1), wherein hot-forming condition: 220 DEG C of temperature keep 20min without under pressure, then under 240 DEG C, 5MPa, keep 10min, the condition of colding pressing: pressure is 5MPa, and the time is 30min.
Embodiment 2
(1) first by CBT100 dry 10h in 90 DEG C of baking ovens, then the catalyzer four (2-ethyl-1,3-hexylene glycol) of getting 100 parts of CBT100 resins being dried and 0.2 part closes titanium and in high-speed mixer, mixes 3min, mixes;
(2) compound in step (1) is extruded through forcing machine (patent CN101474868A design), and allow melting CBT100 resin and the 150 parts of boron fibres extruded meet at staggered two extrusion dies place, realize dipping, then prepreg tape is drawn through cold pressing roller, rolling, can obtain flooding continuous fibre completely and strengthen CBT100 resin prepreg band, wherein extruder screw rotating speed is 45r/min, melt extruding temperature is: 150 DEG C, a district, two 165 DEG C, districts, three 170 DEG C, districts, four 180 DEG C, districts, five 190 DEG C, districts, 190 DEG C of heads, pulling speed is 4m/min;
(3) above-mentioned prepreg tape need to be carried out to cutting, laying according to reality, hot-forming on vulcanizing press, after colding pressing, take out matrix material, and survey its physicals (in table 1), 220 DEG C of temperature keep 30min without under pressure, then under 240 DEG C, 4MPa, keep 20min, the condition of colding pressing: pressure is 5MPa, and the time is 40min.
Embodiment 3
(1) first by CBT200 dry 8h in 100 DEG C of baking ovens, then get 100 parts of CBT200 resins being dried and catalyzer two (acetylacetone based) the metatitanic acid diisopropyl ester of 0.3 part mixes 4min in high-speed mixer, mix;
(2) compound in step (1) is extruded through forcing machine (patent CN101474868A design), and allow melting CBT200 resin and the 167.5 parts of glass fibre extruded meet at staggered two extrusion dies place, realize dipping, then prepreg tape is drawn through cold pressing roller, rolling, can obtain flooding continuous fibre completely and strengthen CBT200 resin prepreg band, wherein extruder screw rotating speed is 80r/min, melt extruding temperature is: 150 DEG C, a district, two 165 DEG C, districts, three 170 DEG C, districts, four 180 DEG C, districts, five 185 DEG C, districts, 185 DEG C of heads, pulling speed is 6m/min,
(3) above-mentioned prepreg tape need to be carried out to cutting, laying according to reality, hot-forming on vulcanizing press, after colding pressing, take out matrix material, and survey its physicals (in table 1), 200 DEG C of temperature keep 40min without under pressure, then under 220 DEG C, 2.5MPa, keep 20min, then keep 10min under 230 DEG C, 5MPa, the condition of colding pressing: pressure is 5MPa, and the time is 45min.
Embodiment 4
(1) first by CBT100 dry 12h in 80 DEG C of baking ovens, then get 100 parts of CBT100 resins being dried and two (methyl aceto acetate) metatitanic acid diisopropyl esters of catalyzer of 0.4 part mix 5min in high-speed mixer, mix;
(2) compound in step (1) is extruded through forcing machine (patent CN101474868A design), and allow melting CBT100 resin and the 235 parts of carbon fibers extruded meet at staggered two extrusion dies place, realize dipping, then prepreg tape is drawn through cold pressing roller, rolling, can obtain flooding continuous fibre completely and strengthen CBT100 resin prepreg band, wherein extruder screw rotating speed is 115r/min, melt extruding temperature is: 150 DEG C, a district, two 165 DEG C, districts, three 170 DEG C, districts, four 180 DEG C, districts, five 190 DEG C, districts, 190 DEG C of heads, pulling speed is 8m/min;
(3) above-mentioned prepreg tape need to be carried out to cutting, laying according to reality, hot-forming on vulcanizing press, after colding pressing, take out matrix material, and survey its physicals (in table 1), 200 DEG C of temperature keep 40min without under pressure, then under 220 DEG C, 2.5MPa, keep 30min, then keep 10min under 240 DEG C, 5MPa, the condition of colding pressing: pressure is 5MPa, and the time is 50min.
Embodiment 5
(1) first by CBT100 dry 10h in 90 DEG C of baking ovens, then get 100 parts of CBT100 resins being dried and the catalyzer dihydroxyl dibutyl tin oxide of 0.6 part mixes 6min in high-speed mixer, mix;
(2) compound in step (1) is extruded through forcing machine (patent CN101474868A design), and allow melting CBT100 resin and the 185 parts of glass fibre extruded meet at staggered two extrusion dies place, realize dipping, then prepreg tape is drawn through cold pressing roller, rolling, can obtain flooding continuous fibre completely and strengthen CBT100 resin prepreg band, wherein extruder screw rotating speed is 150r/min, melt extruding temperature is: 150 DEG C, a district, two 165 DEG C, districts, three 170 DEG C, districts, four 180 DEG C, districts, five 190 DEG C, districts, 190 DEG C of heads, pulling speed is 10m/min,
(3) above-mentioned prepreg tape need to be carried out to cutting, laying according to reality, hot-forming on vulcanizing press, after colding pressing, take out matrix material, and survey its physicals (in table 1), 200 DEG C of temperature keep 50min without under pressure, then under 220 DEG C, 2.5MPa, keep 30min, then keep 10min under 240 DEG C, 5MPa, the condition of colding pressing: pressure is 5MPa, and the time is 60min.
Embodiment 6
(1) first by CBT100 dry 8h in 100 DEG C of baking ovens, then get 100 parts of CBT100 resins being dried and the catalyzer monobutyl three isocaprylic acid tin of 0.6 part mix 7min in high-speed mixer, mix;
(2) compound in step (1) is extruded through forcing machine (patent CN101474868A design), and allow melting CBT100 resin and the 235 parts of glass fibre extruded meet at staggered two extrusion dies place, realize dipping, then prepreg tape is drawn through cold pressing roller, rolling, can obtain flooding continuous fibre completely and strengthen CBT100 resin prepreg band, wherein extruder screw rotating speed is 115r/min, melt extruding temperature is: 150 DEG C, a district, two 165 DEG C, districts, three 170 DEG C, districts, four 180 DEG C, districts, five 190 DEG C, districts, 190 DEG C of heads, pulling speed is 8m/min;
(3) above-mentioned prepreg tape need to be carried out to cutting, laying according to reality, hot-forming on vulcanizing press, after colding pressing, take out matrix material, and survey its physicals (in table 1), 200 DEG C of temperature keep 50min without under pressure, then under 220 DEG C, 2.5MPa, keep 30min, then keep 10min under 240 DEG C, 5MPa, the condition of colding pressing: pressure is 5MPa, and the time is 60min.
Embodiment 7
(1) first by CBT100 dry 8h in 100 DEG C of baking ovens, then get 100 parts of CBT100 resins being dried and the catalyzer monobutyl three isocaprylic acid tin of 0.2 part mix 7min in high-speed mixer, mix;
(2) compound in step (1) is extruded through forcing machine (patent CN101474868A design), and allow melting CBT100 resin and the 235 parts of glass fibre extruded meet at staggered two extrusion dies place, realize dipping, then prepreg tape is drawn through cold pressing roller, rolling, can obtain flooding continuous fibre completely and strengthen CBT100 resin prepreg band, wherein extruder screw rotating speed is 115r/min, melt extruding temperature is: 150 DEG C, a district, two 165 DEG C, districts, three 170 DEG C, districts, four 180 DEG C, districts, five 190 DEG C, districts, 190 DEG C of heads, pulling speed is 8m/min;
(3) above-mentioned prepreg tape need to be carried out to cutting, laying according to reality, hot-forming on vulcanizing press, after colding pressing, take out matrix material, and survey its physicals (in table 1), 200 DEG C of temperature keep 50min without under pressure, then under 220 DEG C, 2.5MPa, keep 30min, then keep 10min under 240 DEG C, 5MPa, the condition of colding pressing: pressure is 5MPa, and the time is 60min.
Table 1 continuous fibre strengthens the performance of CBT matrix material
From table 1, embodiment 1～4 can find out, the physicals of continuous fibre enhancing CBT matrix material is relevant with fibre reinforcement; Can find out from embodiment 5,6, the physicals of matrix material is relevant with fiber reinforcement body burden, when fibre content is higher, tensile strength, flexural strength and modulus in flexure are also higher, but interlaminar shear strength is lower, this is that resin content reduces too many because interlaminar shear strength is relevant with the cohesive strength of resin, resin and interlaminar resin with fiber in matrix material interlayer, and cohesive strength also decreases; Can find out from embodiment 6,7, when catalyst content is lower, also can affect the physicals of matrix material.
The above-mentioned description to embodiment is can understand and apply the invention for ease of those skilled in the art.Person skilled in the art obviously can, easily to these embodiment, make various amendments, and General Principle described herein is applied in other embodiment and needn't passes through performing creative labour.Therefore, the invention is not restricted to the embodiment here, those skilled in the art are according to announcement of the present invention, and not departing from improvement and the amendment that category of the present invention makes all should be within protection scope of the present invention.
Claims (10)
1. continuous fibre strengthens a cyclic butylene terephthalate prepreg tape, it is characterized in that: be made up of the component that comprises following weight part:
100 parts of cyclic butylene terephthalates,
0～0.6 part of catalyzer,
100～235 parts of continuous fibres.
2. continuous fibre according to claim 1 strengthens cyclic butylene terephthalate prepreg tape, it is characterized in that: the content of described catalyzer is 0.2～0.6 part.
3. continuous fibre according to claim 1 strengthens cyclic butylene terephthalate prepreg tape, it is characterized in that: the model of described cyclic butylene terephthalate is CBT100, CBT160 or CBT200.
4. continuous fibre according to claim 1 strengthens cyclic butylene terephthalate prepreg tape, it is characterized in that: described catalyzer is titanium class catalyzer or tin class catalyzer, preferably four (2-ethyl-1,3-hexylene glycols) close titanium, two (acetylacetone based) metatitanic acid diisopropyl ester, two (methyl aceto acetate) metatitanic acid diisopropyl ester, dihydroxyl dibutyl tin oxide or monobutyl three isocaprylic acid tin.
5. continuous fibre according to claim 1 strengthens cyclic butylene terephthalate prepreg tape, it is characterized in that: described continuous fibre is selected from glass fibre, carbon fiber, boron fibre or basalt fibre.
6. a preparation method for arbitrary described continuous fibre enhancing cyclic butylene terephthalate prepreg tape in claim 1-5, is characterized in that: comprise the following steps:
(1) by even the catalyst mix of dry 100 parts of cyclic butylene terephthalates and 0～0.6 part;
(2) compound in step (1) is extruded through forcing machine, and allow melting cyclic butylene terephthalate resin and 100～235 parts of continuous fibres extruded meet at the staggered two extrusion dies place of forcing machine, realize dipping, then prepreg tape is drawn through cold pressing roller, rolling, obtains flooding continuous fibre completely and strengthens cyclic butylene terephthalate prepreg tape.
7. preparation method according to claim 6, is characterized in that: in described step (1), the drying conditions of cyclic butylene terephthalate is: dry 8～12h in 80～100 DEG C of baking ovens;
Or described step (1) in mix device be high-speed mixer, mixing time is 3～7min.
8. preparation method according to claim 6, it is characterized in that: the Preparation equipment that the forcing machine of using in described step (2) is continuous fiber reinforced thermoplastic resin composite material presoaked belt, extruder screw rotating speed is 10～150r/min, melt extruding temperature is 150～190 DEG C, and pulling speed is 2～10m/min.
9. one kind is utilized arbitrary described continuous fibre in claim 1-5 to strengthen the matrix material that cyclic butylene terephthalate prepreg tape makes.
10. a preparation method for matrix material claimed in claim 9, is characterized in that: comprise the steps:
Described continuous fibre is strengthened to the cutting of cyclic butylene terephthalate prepreg tape, laying, hot-forming on vulcanizing press, cold pressing; Wherein said hot-forming condition is: 200～240 DEG C of temperature, and pressure is 0～5MPa, the time is 30～90min; The described pressure of colding pressing is 5MPa, and the time is 30～60min.
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| CN201310120647.3A CN104098875B (en) | 2013-04-09 | 2013-04-09 | A kind of continuous lod CBT prepreg tapes and its preparation method and application |
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| CN107345602A (en) * | 2016-05-04 | 2017-11-14 | 广州金发碳纤维新材料发展有限公司 | A kind of flexible composite pipe and its manufacture method |
| CN109971138A (en) * | 2019-03-22 | 2019-07-05 | 江门市德山复合材料科技有限公司 | A kind of selfreparing PCBT composite material and preparation method |
| CN112480611A (en) * | 2020-11-27 | 2021-03-12 | 上海金发科技发展有限公司 | Low-emission long glass fiber reinforced PCBT material and preparation method thereof |
| CN114561099A (en) * | 2022-04-19 | 2022-05-31 | 宁海宏德新材料科技有限公司 | Solar cell frame material and preparation method thereof |
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| US20050095415A1 (en) * | 2003-10-30 | 2005-05-05 | Raghavendran Venkat K. | Glass mat thermoplastic composite |
| CN102558591A (en) * | 2011-12-22 | 2012-07-11 | 中国科学院宁波材料技术与工程研究所 | Preparation method of fiber-reinforced PCBT thermoplastic composite material bottom plate for electric vehicle |
| CN102555234A (en) * | 2012-02-01 | 2012-07-11 | 中材科技风电叶片股份有限公司 | Resin membrane melt impregnation forming method of fiber reinforced PBT composite material |
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| US20050095415A1 (en) * | 2003-10-30 | 2005-05-05 | Raghavendran Venkat K. | Glass mat thermoplastic composite |
| CN102558591A (en) * | 2011-12-22 | 2012-07-11 | 中国科学院宁波材料技术与工程研究所 | Preparation method of fiber-reinforced PCBT thermoplastic composite material bottom plate for electric vehicle |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107345602A (en) * | 2016-05-04 | 2017-11-14 | 广州金发碳纤维新材料发展有限公司 | A kind of flexible composite pipe and its manufacture method |
| CN109971138A (en) * | 2019-03-22 | 2019-07-05 | 江门市德山复合材料科技有限公司 | A kind of selfreparing PCBT composite material and preparation method |
| CN109971138B (en) * | 2019-03-22 | 2021-08-17 | 江门市德山复合材料科技有限公司 | Self-repairing PCBT composite material and preparation method thereof |
| CN112480611A (en) * | 2020-11-27 | 2021-03-12 | 上海金发科技发展有限公司 | Low-emission long glass fiber reinforced PCBT material and preparation method thereof |
| CN114561099A (en) * | 2022-04-19 | 2022-05-31 | 宁海宏德新材料科技有限公司 | Solar cell frame material and preparation method thereof |
| CN114561099B (en) * | 2022-04-19 | 2024-03-08 | 宁海宏德新材料科技有限公司 | Solar cell frame material and preparation method thereof |
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| CN104098875B (en) | 2017-10-17 |
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Denomination of invention: Continuous fiber-enhanced CBT prepreg, and preparation method and application thereof Effective date of registration: 20191202 Granted publication date: 20171017 Pledgee: Chuzhou economic and Technological Development Corporation Pledgor: Shanghai Jieshijie New Materials (Group) Co., Ltd. Registration number: Y2019980000815 |