CN104987681B - Inorganic filler synergistic toughening polyactic acid hybrid material and preparation method thereof - Google Patents
Inorganic filler synergistic toughening polyactic acid hybrid material and preparation method thereof Download PDFInfo
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Abstract
The invention discloses an inorganic filler synergistic toughening polyactic acid hybrid material and a preparation method thereof. The raw materials of the inorganic filler synergistic toughening polyactic acid hybrid material comprise, by weight, 65-85% of polyactic acid, 1-18% of barium sulfate and 12-18% of calcium carbonate. According to the inorganic filler synergistic toughening polyactic acid hybrid material and the preparation method thereof, in cooperation with melt blending and compression molding forming technology, the obtained inorganic filler synergistic toughening polyactic acid hybrid material has the advantages that the rigidity, the strength and the heat resistance of the polyactic acid are maintained, and meanwhile the impact toughness, the elongation at break and the elasticity modulus of the hybrid material are improved.
Description
Technical field
The present invention relates to PLA technical field, more particularly to a kind of inorganic filler coordination plasticizing PLA hybrid materials and
Its preparation method.
Background technology
Inorganic rigid particle is introduced in polymeric matrix to prepare the weight that composite is raising polymer performance
Want means.Inorganic particulate can not only reduce product cost, it is often more important that improve the physics and mechanics function of traditional material, such as strong
Degree, rigidity, toughness, heat-resisting, fire-retardant, shielding and conduction etc., wherein the toughening effect in inorganic rigid particle crystalline polymer grinds
Study carefully interesting.
PLA (PLA) is a kind of artificial synthesized thermoplastic resin, with excellent biocompatibility and absorbability,
It is widely used in biomedical sector.The recyclability of the plant material that PLA has and the characteristic of fully biodegradable, determine
It equally has huge application potential in daily life and industrial circle.However, the pliability of PLA is very poor, impact flexibility
It is low, greatly limit the application field of its product.Substantial amounts of research is confirmed, by grafting, blending, copolymerization and addition
The physics such as plasticizer and chemical method can improve the toughness of PLA.Although thermoplastic elastomer (TPE) is the most simply have with the blending of PLA
The toughening methods of effect and effect is significant, but the often performance such as intensity, rigidity of influence material.
The content of the invention
Based on the technical problem that background technology is present, the present invention proposes a kind of inorganic filler coordination plasticizing PLA and mixes
Material and preparation method thereof, the PLA hybrid materials impact flexibility and elongation at break for obtaining is high, and elastic modelling quantity is big, and compression is forever
Deform long small.
A kind of inorganic filler coordination plasticizing PLA hybrid materials proposed by the present invention, its raw materials by weight bag
Include：PLA 65-85%, barium sulfate 1-18%, calcium carbonate 12-18%.
Preferably, its raw materials by weight includes：PLA 70-80%, barium sulfate 5-15%, calcium carbonate 14-
17%.
Preferably, its raw materials by weight includes：PLA 70-75%, barium sulfate 11-15%, calcium carbonate 14-
15%.
Preferably, its raw materials by weight includes：PLA 70%, barium sulfate 15%, calcium carbonate 15%.
Preferably, the melt index of the PLA is 10-20g/10min, and density is 1-1.5g/cm3。
Preferably, the melt index of the PLA is 15g/10min, and density is 1.25g/cm3。
Preferably, the barium sulfate is surface modified barium sulphate, and method of modifying is wet-process modified, and modifying agent is silane coupled
One or more mixture in agent KH550, silane coupler KH560, silane coupler KH570, stearic acid；The carbon
Sour calcium is surface modified calcium carbonate, and method of modifying is wet-process modified, and modifying agent is Silane coupling agent KH550, silane coupler
One or more mixture in KH560, silane coupler KH570, stearic acid；
The specific preparation technology of surface modified barium sulphate is：By in modifying agent addition absolute ethyl alcohol, forming volumetric concentration is
1.5% solution, is subsequently adding barium sulfate, the stir about 2-4h at 50 DEG C, then through suction filtration, washing after, in vacuum drying chamber
In be dried to obtain surface modified barium sulphate；
The specific preparation technology of surface modified calcium carbonate is：By in modifying agent addition absolute ethyl alcohol, forming volumetric concentration is
1.5% solution, is subsequently adding calcium carbonate, the stir about 2-4h at 50 DEG C, then through suction filtration, washing after, in vacuum drying chamber
In be dried to obtain surface modified calcium carbonate.
Preferably, the calcium carbonate is precipitated calcium carbonate, and the granularity of the precipitated calcium carbonate is 1200-1300 mesh, density
It is 2.7-2.9g/cm3。
Preferably, the granularity of the precipitated calcium carbonate is 1250 mesh, and density is 2.8g/cm3。
Preferably, the barium sulfate is ultra-fine barium sulfate, and the particle diameter of the ultra-fine barium sulfate is 0.1-0.5 μm, and density is
4-4.5g/cm3。
Preferably, the particle diameter of the ultra-fine barium sulfate is 0.25 μm, and density is 4.2g/cm3。
The invention allows for a kind of preparation method of the inorganic filler coordination plasticizing PLA hybrid materials, including with
Lower step：Melt blending is carried out in addition mill obtain blend composition after each raw material is mixed by proportioning, wherein, melt blending
Temperature is 125-135 DEG C, and time of melt blending is 25-35min, during blend composition then added into mould, in vulcanizing press
On carry out hot-forming, the inorganic filler coordination plasticizing PLA hybrid materials are obtained after cooling, wherein, in hot-forming mistake
Cheng Zhong, hot-forming temperature is 135-145 DEG C, and hot-forming pressure is 12-18MPa, and the hot-forming time is 8-
12min。
Preferably, the mould is with dimethicone as releasing agent.
Preferably, exhaust is also included during hot-forming.
Preferably, the preparation method of the inorganic filler coordination plasticizing PLA hybrid materials, comprises the following steps：By matching somebody with somebody
Than weighing each raw material, each raw material is placed in vacuum drying oven and is dried, wherein, drying temperature is 75-85 DEG C, and drying time is 25-
35min；Add two-roll mill to carry out melt blending after premixing and obtain blend composition, wherein, the temperature of melt blending is 128-
133 DEG C, the time of melt blending is 28-32min；Then blend composition is added and is preheated to 135-145 DEG C, is with dimethicone
In the mould of releasing agent, carried out on vulcanizing press hot-forming, the poly- breast of the inorganic filler coordination plasticizing is obtained after water-cooled
Sour hybrid materials, wherein, during hot-forming, hot-forming temperature is 138-142 DEG C, and hot-forming pressure is
14-16MPa, the hot-forming time is 9-11min.
Preferably, the preparation method of the inorganic filler coordination plasticizing PLA hybrid materials, comprises the following steps：By matching somebody with somebody
Than weighing each raw material, each raw material is placed in vacuum drying oven and is dried, wherein, drying temperature is 80 DEG C, and drying time is 30min；
Add two-roll mill to carry out melt blending after premixing and obtain blend composition, wherein, the temperature of melt blending is 130 DEG C, melting
The time of blending is 30min；Then blend composition is added in being preheated to 140 DEG C, the mould with dimethicone as releasing agent,
Carry out hot-forming on vulcanizing press, the inorganic filler coordination plasticizing PLA hybrid materials are obtained after water-cooled, wherein,
In hot-forming process, hot-forming temperature is 140 DEG C, and hot-forming pressure is 15MPa, and the hot-forming time is
10min, and carry out 3 exhausts.
In the present invention, have selected inorganic rigid particle calcium carbonate and barium sulfate cooperation carries out toughening modifying to PLA, leads to
The ratio of barium sulfate and calcium carbonate is overregulated, and selects the suitable surface modifier to carry out the interface of inorganic filler and PLA
Appropriate treatment, its intensity, rigidity and heat resistance are maintained while PLA toughness is improved；Specifically, calcium carbonate is added
After in matrix, interface compatibility between the two is good with the formal distribution of single or small cluster in the base, and in calcium carbonate
Obvious fento and cavitation phenomenon are occurred in that around ion, after introducing barium sulfate, barium sulfate is in the base individual particle shape
Disperse has preferable interfacial adhesion around calcium carbonate between matrix；Both barium sulfate and calcium carbonate coordinate addition
To in system, by both ratios with PLA of control, propose the collaboration distribution in the base of various sizes of inorganic particle
The high impact flexibility of hybrid materials, elongation at break and elastic modelling quantity, and maintain the rigidity of PLA, intensity and heat-resisting
Property.
Brief description of the drawings
Fig. 1 is Flied emission that barium sulfate content is the PLA hybrid materials impact fracture surface that 0%, calcium carbonate content is 15%
Scanning electron microscope (SEM) photograph；
Fig. 2 is scanned for the Flied emission of inorganic filler coordination plasticizing PLA hybrid materials impact fracture surface described in the present embodiment 5
Electron microscope；
Fig. 3 is the Flied emission scanning electricity of inorganic filler coordination plasticizing PLA hybrid materials impact fracture surface described in embodiment 4
Mirror figure.
Specific embodiment
Below, technical scheme is described in detail by specific embodiment.
Embodiment 1
A kind of inorganic filler coordination plasticizing PLA hybrid materials proposed by the present invention, its raw materials by weight bag
Include：PLA 65%, barium sulfate 18%, calcium carbonate 17%；
Wherein, the calcium carbonate is precipitated calcium carbonate, and the granularity of the precipitated calcium carbonate is 1200 mesh, and density is 2.7g/
cm3。
Embodiment 2
A kind of inorganic filler coordination plasticizing PLA hybrid materials proposed by the present invention, its raw materials by weight bag
Include：PLA 85%, barium sulfate 1%, calcium carbonate 14%；
Wherein, the calcium carbonate is precipitated calcium carbonate, and the granularity of the precipitated calcium carbonate is 1300 mesh, and density is 2.9g/
cm3；The barium sulfate is ultra-fine barium sulfate, and the particle diameter of the ultra-fine barium sulfate is 0.1 μm, and density is 4.5g/cm3；
The preparation method of inorganic filler coordination plasticizing PLA hybrid materials of the present invention, comprises the following steps：By matching somebody with somebody
Than weighing each raw material, each raw material is placed in vacuum drying oven and is dried, wherein, drying temperature is 75 DEG C, and drying time is 35min；
Add two-roll mill to carry out melt blending after premixing and obtain blend composition, wherein, the temperature of melt blending is 128 DEG C, melting
The time of blending is 32min；Then blend composition is added in being preheated to 135 DEG C, the mould with dimethicone as releasing agent,
Carry out hot-forming on vulcanizing press, the inorganic filler coordination plasticizing PLA hybrid materials are obtained after water-cooled, wherein,
In hot-forming process, hot-forming temperature is 142 DEG C, and hot-forming pressure is 14MPa, and the hot-forming time is
11min。
Embodiment 3
A kind of inorganic filler coordination plasticizing PLA hybrid materials proposed by the present invention, its raw materials by weight bag
Include：PLA 72%, barium sulfate 10%, calcium carbonate 18%；
Wherein, the calcium carbonate is precipitated calcium carbonate, and the granularity of the precipitated calcium carbonate is 1100 mesh, and density is 2.8g/
cm3；The barium sulfate is ultra-fine barium sulfate, and the particle diameter of the ultra-fine barium sulfate is 0.5 μm, and density is 4g/cm3；
The preparation method of inorganic filler coordination plasticizing PLA hybrid materials of the present invention, comprises the following steps：By matching somebody with somebody
Than weighing each raw material, each raw material is placed in vacuum drying oven and is dried, wherein, drying temperature is 75 DEG C, and drying time is 35min；
Add two-roll mill to carry out melt blending after premixing and obtain blend composition, wherein, the temperature of melt blending is 125 DEG C, melting
The time of blending is 35min；Then blend composition is added in being preheated to 135 DEG C, the mould with dimethicone as releasing agent,
Carry out hot-forming on vulcanizing press, the inorganic filler coordination plasticizing PLA hybrid materials are obtained after water-cooled, wherein,
In hot-forming process, hot-forming temperature is 145 DEG C, and hot-forming pressure is 12MPa, and the hot-forming time is
12min。
Embodiment 4
A kind of inorganic filler coordination plasticizing PLA hybrid materials proposed by the present invention, its raw materials by weight bag
Include：PLA 70%, barium sulfate 15%, calcium carbonate 15%；
Wherein, the melt index of the PLA is 15g/10min, and density is 1.25g/cm3；
The barium sulfate is surface modified barium sulphate, and method of modifying is wet-process modified, and modifying agent is silane coupler
KH550, silane coupler KH560, silane coupler KH570, stearic acid press 1:4:2:3 weight than combination；The calcium carbonate
It is surface modified calcium carbonate, method of modifying is wet-process modified, and modifying agent is stearic acid；
The calcium carbonate is precipitated calcium carbonate；The granularity of the precipitated calcium carbonate is 1250 mesh, and density is 2.8g/cm3；
The barium sulfate is ultra-fine barium sulfate, and the particle diameter of the ultra-fine barium sulfate is 0.2 μm, and density is 4.3g/cm3；
The preparation method of inorganic filler coordination plasticizing PLA hybrid materials of the present invention, comprises the following steps：By matching somebody with somebody
Than weighing each raw material, each raw material is placed in vacuum drying oven and is dried, wherein, drying temperature is 85 DEG C, and drying time is 25min；
Add two-roll mill to carry out melt blending after premixing and obtain blend composition, wherein, the temperature of melt blending is 135 DEG C, melting
The time of blending is 25min；Then blend composition is added in being preheated to 145 DEG C, the mould with dimethicone as releasing agent,
Carry out hot-forming on vulcanizing press, the inorganic filler coordination plasticizing PLA hybrid materials are obtained after water-cooled, wherein,
In hot-forming process, hot-forming temperature is 135 DEG C, and hot-forming pressure is 18MPa, and the hot-forming time is
8min。
Embodiment 5
A kind of inorganic filler coordination plasticizing PLA hybrid materials proposed by the present invention, its raw materials by weight bag
Include：PLA 80%, barium sulfate 5%, calcium carbonate 15%；
Wherein, the melt index of the PLA is 20g/10min, and density is 1.5g/cm3；
The barium sulfate is surface modified barium sulphate, and method of modifying is wet-process modified, and modifying agent is silane coupler
KH560, silane coupler KH570, stearic acid press 1:4:2 weight than combination；The calcium carbonate is surface modified calcium carbonate, is changed
Property method for wet-process modified, modifying agent is silane coupler KH560；
The calcium carbonate is precipitated calcium carbonate, and the granularity of the precipitated calcium carbonate is 1260 mesh, and density is 2.8g/cm3；
The barium sulfate is ultra-fine barium sulfate, and the particle diameter of the ultra-fine barium sulfate is 0.25 μm, and density is 4.2g/cm3；
The preparation method of inorganic filler coordination plasticizing PLA hybrid materials of the present invention, comprises the following steps：By matching somebody with somebody
Than weighing each raw material, each raw material is placed in vacuum drying oven and is dried, wherein, drying temperature is 85 DEG C, and drying time is 25min；
Add two-roll mill to carry out melt blending after premixing and obtain blend composition, wherein, the temperature of melt blending is 133 DEG C, melting
The time of blending is 28min；Then blend composition is added in being preheated to 145 DEG C, the mould with dimethicone as releasing agent,
Carry out hot-forming on vulcanizing press, the inorganic filler coordination plasticizing PLA hybrid materials are obtained after water-cooled, wherein,
In hot-forming process, hot-forming temperature is 138 DEG C, and hot-forming pressure is 16MPa, and the hot-forming time is
9min。
Embodiment 6
A kind of inorganic filler coordination plasticizing PLA hybrid materials proposed by the present invention, its raw materials by weight bag
Include：PLA 73%, barium sulfate 13%, calcium carbonate 14%；
Wherein, the melt index of the PLA is 10g/10min, and density is 1g/cm3；
The barium sulfate is surface modified barium sulphate, and method of modifying is wet-process modified, and modifying agent is silane coupler
KH550；The calcium carbonate is surface modified calcium carbonate, and method of modifying is wet-process modified, and modifying agent is silane coupler silicon
KH560, silane coupler KH570 are by weight 1:3 combination；
The preparation method of inorganic filler coordination plasticizing PLA hybrid materials of the present invention, comprises the following steps：By matching somebody with somebody
Than weighing each raw material, each raw material is placed in vacuum drying oven and is dried, wherein, drying temperature is 80 DEG C, and drying time is 30min；
Add two-roll mill to carry out melt blending after premixing and obtain blend composition, wherein, the temperature of melt blending is 130 DEG C, melting
The time of blending is 30min；Then blend composition is added in being preheated to 140 DEG C, the mould with dimethicone as releasing agent,
Carry out hot-forming on vulcanizing press, the inorganic filler coordination plasticizing PLA hybrid materials are obtained after water-cooled, wherein,
In hot-forming process, hot-forming temperature is 140 DEG C, and hot-forming pressure is 15MPa, and the hot-forming time is
10min, and carry out 3 exhausts.
According to GB/T 1040.1-2006, by inorganic filler coordination plasticizing PLA hybrid materials laser of the present invention
Engraving machine is made dumbbell shape, and using WDW-50 type universal electrical experimental machines, to test its unidirectional under conditions of speed is 2mm/min
Tensile property；According to GB/T 1043.1-2008, inorganic filler coordination plasticizing PLA hybrid materials of the present invention are used and is swashed
Light engraving machine is made long strip type, on TCJ-25J type impact experiment machines, non-notch freely-supported is carried out under conditions of span is 60mm
Beam impact test；Test result is as follows：Impact flexibility is 21-32.91KJ/m2, elongation at break is 3.49-8.64%,
Tensile strength is 42-51.8MPa, and elastic modelling quantity is 3.54-3.93GPa.
It is mixed to inorganic filler coordination plasticizing PLA of the present invention using field emission scanning electron microscope S-4800 (Hitachi)
The microscopic appearance of miscellaneous material is observed, as a result as shown in Figure 1, Figure 2, Figure 3 shows, wherein, Fig. 1 is that barium sulfate content is 0%, carbonic acid
Calcium content is the field emission scanning electron microscope figure of 15% PLA hybrid materials impact fracture surface, as shown in figure 1, calcium carbonate is with single
Or the formal distribution of small cluster is in the base, interface compatibility between the two is good, and is occurred in that around carbonic acid calcium ion
Obvious fento and cavitation phenomenon, during showing that hybrid materials that barium sulfate content is 0% are broken, calcium carbonate and matrix
Interface interface debonding phenomenon is there occurs due to stress concentration；Fig. 2 is poly- for inorganic filler coordination plasticizing described in the present embodiment 5
The field emission scanning electron microscope figure of lactic acid hybrid materials impact fracture surface, Fig. 3 is inorganic filler coordination plasticizing described in the embodiment of the present invention 4
The field emission scanning electron microscope figure of PLA hybrid materials impact fracture surface, from Fig. 2, Fig. 3, ultra-fine barium sulfate size is small, introduces
In matrix, in the base in individual particle shape disperse around calcium carbonate, and there is preferable interfacial adhesion between matrix, this
Plant impact flexibility, elongation at break and bullet that the collaboration distribution in the base of various sizes of inorganic particle improves hybrid materials
Property modulus.
The above, the only present invention preferably specific embodiment, but protection scope of the present invention is not limited thereto,
Any one skilled in the art the invention discloses technical scope in, technology according to the present invention scheme and its
Inventive concept is subject to equivalent or change, should all be included within the scope of the present invention.
Claims (12)
1. a kind of inorganic filler coordination plasticizing PLA hybrid materials, it is characterised in that its raw materials by weight includes：It is poly-
Lactic acid 65-85%, barium sulfate 1-18%, calcium carbonate 12-18%；
The melt index of the PLA is 10-20g/10min, and density is 1-1.5g/cm3；The calcium carbonate is lightweight carbonic acid
Calcium, the granularity of the precipitated calcium carbonate is 1200-1300 mesh, and density is 2.7-2.9g/cm3；The barium sulfate is ultra-fine sulfuric acid
Barium, the particle diameter of the ultra-fine barium sulfate is 0.1-0.5 μm, and density is 4-4.5g/cm3；
The method for preparing the inorganic filler coordination plasticizing PLA hybrid materials is comprised the following steps：Each raw material is mixed by proportioning
Melt blending is carried out in addition mill obtain blend composition after conjunction, wherein, the temperature of melt blending is 125-135 DEG C, and melting is altogether
The mixed time is 25-35min, then will during blend composition adds mould, carry out on vulcanizing press it is hot-forming, after cooling
To the inorganic filler coordination plasticizing PLA hybrid materials, wherein, during hot-forming, hot-forming temperature is
135-145 DEG C, hot-forming pressure is 12-18MPa, and the hot-forming time is 8-12min.
2. inorganic filler coordination plasticizing PLA hybrid materials according to claim 1, it is characterised in that its raw material is by weight
Percentage includes：PLA 70-80%, barium sulfate 5-15%, calcium carbonate 14-17%.
3. inorganic filler coordination plasticizing PLA hybrid materials according to claim 1, it is characterised in that its raw material is by weight
Percentage includes：PLA 70-75%, barium sulfate 11-15%, calcium carbonate 14-15%.
4. inorganic filler coordination plasticizing PLA hybrid materials according to claim 1, it is characterised in that its raw material is by weight
Percentage includes：PLA 70%, barium sulfate 15%, calcium carbonate 15%.
5. inorganic filler coordination plasticizing PLA hybrid materials according to claim 1 or claim 2, it is characterised in that the poly- breast
The melt index of acid is 15g/10min, and density is 1.25g/cm3。
6. inorganic filler coordination plasticizing PLA hybrid materials according to any one of claim 1-4, it is characterised in that institute
Barium sulfate is stated for surface modified barium sulphate, method of modifying is wet-process modified, and modifying agent is Silane coupling agent KH550, silane coupled
One or more mixture in agent KH560, silane coupler KH570, stearic acid；The calcium carbonate is surface modified carbon
Sour calcium, method of modifying is wet-process modified, and modifying agent is Silane coupling agent KH550, silane coupler KH560, silane coupler
One or more mixture in KH570, stearic acid.
7. inorganic filler coordination plasticizing PLA hybrid materials according to any one of claim 1-4, it is characterised in that institute
The granularity of precipitated calcium carbonate is stated for 1250 mesh, density is 2.8g/cm3。
8. inorganic filler coordination plasticizing PLA hybrid materials according to any one of claim 1-4, it is characterised in that institute
The particle diameter of ultra-fine barium sulfate is stated for 0.25 μm, density is 4.2g/cm3。
9. inorganic filler coordination plasticizing PLA hybrid materials according to claim 1, it is characterised in that the mould is with two
Methyl-silicone oil is releasing agent.
10. inorganic filler coordination plasticizing PLA hybrid materials according to claim 9, it is characterised in that hot-forming
During also include exhaust.
11. according to claim 9 or 10 inorganic filler coordination plasticizing PLA hybrid materials, it is characterised in that including with
Lower step：Each raw material is weighed by proportioning, each raw material is placed in vacuum drying oven and is dried, wherein, drying temperature is 75-85 DEG C, is done
The dry time is 25-35min；Add two-roll mill to carry out melt blending after premixing and obtain blend composition, wherein, melt blending
Temperature is 128-133 DEG C, and the time of melt blending is 28-32min；Then by blend composition add be preheated to 135-145 DEG C, with two
During methyl-silicone oil is for the mould of releasing agent, carried out on vulcanizing press hot-forming, inorganic filler association is obtained after water-cooled
With plasticizing polylactic acid hybrid materials, wherein, during hot-forming, hot-forming temperature is 138-142 DEG C, is hot pressed into
The pressure of type is 14-16MPa, and the hot-forming time is 9-11min.
12. according to claim 9 or 10 inorganic filler coordination plasticizing PLA hybrid materials, it is characterised in that including with
Lower step：Each raw material is weighed by proportioning, each raw material is placed in vacuum drying oven and is dried, wherein, drying temperature is 80 DEG C, when drying
Between be 30min；Add two-roll mill to carry out melt blending after premixing and obtain blend composition, wherein, the temperature of melt blending is
130 DEG C, the time of melt blending is 30min；Then by blend composition add be preheated to 140 DEG C, with dimethicone as releasing agent
Mould in, carried out on vulcanizing press hot-forming, the inorganic filler coordination plasticizing PLA is obtained after water-cooled and is mixed
Material, wherein, during hot-forming, hot-forming temperature is 140 DEG C, and hot-forming pressure is 15MPa, hot pressing
The time of shaping is 10min, and carries out 3 exhausts.
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| CN105504725A (en) * | 2016-01-29 | 2016-04-20 | 常州市鼎升环保科技有限公司 | Method for preparing polylactic acid composite material by modifying papermaking white mud |
| SG10201912814PA (en) | 2016-02-12 | 2020-02-27 | Univ Nanyang Tech | A composite material with enhanced mechanical properties and a method to fabricate the same |
| CN111363325B (en) * | 2020-03-31 | 2022-12-27 | 宁波普莱斯帝金属制品有限公司 | Preparation method of barium sulfate polylactic acid composite material |
| CN116285477A (en) * | 2023-03-09 | 2023-06-23 | 浙江中烟工业有限责任公司 | Heat-insulating high-temperature-resistant coating, preparation method and application |
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