CN109320935B - Production process for improving polycarbonate alloy material color powder point - Google Patents
Production process for improving polycarbonate alloy material color powder point Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L69/00—Compositions of polycarbonates; Compositions of derivatives of polycarbonates
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
- C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
- C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend
Abstract
The invention discloses a production process for improving the color point of a polycarbonate alloy material, which comprises the following steps of firstly, optimizing a formula, and changing the situation that only granules or only powder is used in the traditional process, and polycarbonate granules and powder are used at the same time; secondly, a mixing process is adjusted, materials are added according to a crossed mixing sequence of granular materials, powder materials, granular materials and powder materials, polycarbonate powder materials and high-rubber powder materials are respectively inserted between the polycarbonate granular materials and thermoplastic resin granular materials, the materials are mixed and added at high speed in the whole adding process, the space dispersity of the granular materials and the powder is better than that of the granular materials and the powder before optimization, the granular materials can also play a role in stirring in the powder, and the uniform mixing of all the materials can be fully ensured. The obtained alloy material has the advantages that the types of the raw material components are not changed, the form and the feeding sequence of the same resin raw material are changed, the comprehensive performance of the final product is good, the finished product has high glossiness, the surface is uniform and smooth, and the product has no toner dots.
Description
Technical Field
The invention relates to a method for modifying a polycarbonate alloy material, in particular to a production process for improving the color point of the polycarbonate alloy material, belonging to the technical field of high polymer materials and molding processing thereof.
Background
Polycarbonate resin (PC resin) is a colorless and transparent amorphous thermoplastic material, and is widely used in many fields such as packaging, daily necessities, electronic and electric appliances, toys, instruments, transportation, and machine manufacturing because it is easily processed and suitable for various molding methods such as injection, extrusion molding, blow molding, etc., and has good mechanical and optical properties. In addition, the material can be blended with engineering plastics such as ABS, PBT, PET and the like, so that the performance of the material is further improved, and the material can be prepared into an alloy material. In the process of processing, various toners are added for the aesthetic appearance of products to produce products with different colors, but the respective particle shapes and particle size distributions of the toners are different, so that the glossiness of the surfaces of the polycarbonate and the alloy thereof is greatly influenced, so that different color points (colored points) appear on the surfaces of product parts, the different color points caused by the uneven dispersion of the toners are collectively called the toner points in the field, and the toner points can be obviously seen by injection molding of the parts, so that the aesthetic property of the products is reduced, and the use of the polycarbonate and the alloy thereof is also greatly limited. Therefore, it is necessary to improve the toner dots of polycarbonate and its alloys in order to improve the overall performance.
In order to solve this problem, the prior art generally improves the toner point by adding a dispersant to the resin system, but this method requires the addition of new materials, and also considers whether the performance, manufacturing cost, production process and the like of the composition are affected, and it is difficult to achieve good effect.
Disclosure of Invention
In order to solve the technical problems, the invention provides a production process for improving the color powder point of a polycarbonate alloy material.
The technical scheme of the invention is as follows:
the invention discloses a production process for improving the color point of a polycarbonate alloy material, which comprises the following steps:
(1) weighing polycarbonate powder, polycarbonate granules, thermoplastic resin granules, ABS high-rubber powder, toner and other components according to the formula dosage for later use; the components are as follows by weight: 10-30 parts of polycarbonate powder, 40-80 parts of polycarbonate granules, 5-30 parts of thermoplastic resin granules, 5-40 parts of ABS high rubber powder, 0.5-3.0 parts of toner and 0-30 parts of other components; the particle size of the polycarbonate powder is 20-300 meshes, and the particle size of the ABS high-rubber powder is 400-2000 meshes;
(2) after polycarbonate granules are put into a high-speed mixer, starting the high-speed mixer, then putting polycarbonate powder into the high-speed mixer in the high-speed operation process for high-speed mixing, and then sequentially putting thermoplastic resin granules, ABS high-rubber powder, other components and toner into the high-speed mixer in the high-speed operation process for high-speed mixing to obtain a premix; wherein the rotating speed of the high-speed mixer is 400-900r/min when the high-speed mixer is used for high-speed mixing;
(3) and adding the obtained premix into a double-screw extruder through a weight-loss metering scale, and carrying out melt blending extrusion to obtain the polycarbonate alloy material without a toner point.
The further technical scheme is as follows:
the polycarbonate powder and the polycarbonate pellets in the step (1) are both at least one of aromatic polycarbonate, aliphatic polycarbonate, aromatic-aliphatic polycarbonate and branched polycarbonate, and the aromatic polycarbonate with the viscosity average molecular weight of 13000-40000 and the viscosity average molecular weight of 17000-24000 is particularly preferable because the aromatic polycarbonate has good mechanical properties and excellent moldability when the viscosity average molecular weight is in the range of 17000-24000. The polycarbonate powder and the polycarbonate granules are prepared by an interfacial polymerization method, a melt transesterification method, a pyridine method, a ring-opening polymerization method of a cyclic carbonate compound or a solid-phase transesterification method of a prepolymer, and the preparation methods are all conventional technical schemes in the field, so the details are not repeated.
The thermoplastic resin pellets in the step (1) are thermoplastic resin in a particle state capable of being subjected to blending modification with polycarbonate, and the thermoplastic resin pellets are at least one of ABS, PE, PP, PET, PBT and PS, including but not limited to the above materials.
The other components in the step (1) are at least one of a filler, a flame retardant, a toughening agent, a weather resisting agent, a compatilizer, an antioxidant and a chain extender, and other common auxiliary agents in the modified plastic industry.
And (3) the process parameters of the melt blending extrusion of the double-screw extruder are as follows: the temperature of the first section is 90-110 ℃, the temperature of the second section is 230-.
The invention also discloses a colorless powder point polycarbonate alloy material produced by the production process, which consists of the following components in parts by weight: 10-30 parts of polycarbonate powder, 40-80 parts of polycarbonate granules, 5-30 parts of thermoplastic resin granules, 5-40 parts of ABS high rubber powder, 0.5-3.0 parts of toner and 0-30 parts of other components.
The further technical scheme is as follows:
the polycarbonate powder and the polycarbonate pellets are both at least one of aromatic polycarbonate, aliphatic polycarbonate, aromatic-aliphatic polycarbonate and branched polycarbonate, and the polycarbonate powder and the polycarbonate pellets have a viscosity average molecular weight of 13000-40000, and particularly aromatic polycarbonate having a viscosity average molecular weight of 17000-24000 is preferred because the aromatic polycarbonate has good mechanical properties and excellent moldability when the viscosity average molecular weight is in the range of 17000-24000. The polycarbonate powder and the polycarbonate granules are prepared by an interfacial polymerization method, a melt transesterification method, a pyridine method, a ring-opening polymerization method of a cyclic carbonate compound or a solid-phase transesterification method of a prepolymer, and the preparation methods are all conventional technical schemes in the field, so the details are not repeated.
The thermoplastic resin pellet is a thermoplastic resin in a particle state capable of being subjected to blending modification with polycarbonate, and the thermoplastic resin pellet is at least one of ABS, PE, PP, PET, PBT and PS, including but not limited to the above materials. ABS used here is ABS resin in a granular state, which is common in the art, and is in a state different from ABS high-rubber powder in a powdery state, which is generally cylindrical, about 4 to 6mm in length and about 2 to 3mm in diameter; of these, PE, PP, PET and PS are also conventional resins in the art in pellet form.
The particle size of the ABS high-rubber powder is 400-2000 meshes.
The other components are at least one of filler, flame retardant, toughening agent, weather resisting agent, compatilizer, antioxidant and chain extender, and other additives commonly used in the modified plastic industry.
The beneficial technical effects of the invention are as follows: the production process is optimized in two aspects according to the principle that the larger the specific surface area of the substance is, the better the dispersibility is: firstly, the formula is optimized, the condition that only granular resin or only powder resin is used in the traditional process is changed, and polycarbonate granules and polycarbonate powder are used simultaneously; secondly, the method adjusts a material mixing process, the feeding sequence of the granules and the powder is mainly adjusted, the materials are fed according to the crossed material mixing sequence of the granules, the powder, the granules and the powder, the polycarbonate powder and the high rubber powder are respectively inserted between the polycarbonate granules and the thermoplastic resin granules, the polycarbonate granules and the high rubber powder are mixed and added at high speed in the whole adding process, the spatial dispersibility of the granules and the powder is better than that of the granules and the powder before optimization, and the polycarbonate granules and the thermoplastic resin granules can also play a role in stirring in the powder, so that the uniform material mixing of all the materials can be fully ensured. The colorless powder point polycarbonate alloy material prepared by the method does not change the types of the raw material components, and only changes the form of the same resin raw material and the feeding sequence process, so that the final product has good comprehensive performance, high glossiness of the product part, uniform and smooth surface and colorless powder points.
Detailed Description
In order to clearly understand the technical means of the present invention and to implement the technical means according to the content of the specification, the following embodiments are further described in detail in the following with reference to the specific examples, which are used for illustrating the present invention and are not intended to limit the scope of the present invention.
The following specific examples and comparative examples used the following raw materials and equipment:
polycarbonate pellets (PC pellets): melt flow rate 10-20g/10min (260 ℃/2.16KG), commercially available;
polycarbonate powder (PC powder): melt flow rate 20-25g/10min (260 ℃/2.16KG), commercially available;
thermoplastic resin pellets: ABS, PE, PP, PET, PBT and PS, commercially available;
ABS high rubber powder: the particle size is 400-2000nm, and the particle size is sold on the market;
toner: is sold on the market;
other components: antioxidants, commercially available; and (4) a filler which is commercially available.
A double-screw extruder: model TSE-75, length-diameter ratio 40:1, manufactured by Nanjing Ruiya Polymer Equipment Co.
The thermoplastic flame-retardant composite material is prepared by adopting the raw materials according to the formula and the process shown in the following specific examples and comparative examples, the raw materials and the process which are not mentioned are all conventional technical means in the field, and any selection which is in accordance with the actual situation can be made within the processing range of the polycarbonate alloy material.
The specific embodiment is as follows:
specific examples 1-5 were prepared according to the formulations described in table 1.
TABLE 1 EXAMPLES 1-5 the amounts of the respective components (unit: parts by weight)
The production process of the above specific examples 1 to 5 is as follows:
(1) weighing PC powder, PC granules, thermoplastic resin granules, ABS high-rubber powder, toner and other components according to the formula dosage in the table 1 for later use;
(2) after PC granules are put into a high-speed mixer, starting the high-speed mixer, then putting PC powder into the high-speed mixer in the high-speed operation process for high-speed mixing, and then sequentially putting thermoplastic resin granules, ABS high-rubber powder, other components and toner into the high-speed mixer in the high-speed operation process for high-speed mixing to obtain a premix; wherein the rotating speed of the high-speed mixer is 400-900r/min when the high-speed mixer is used for high-speed mixing;
(3) and adding the obtained premix into a double-screw extruder through a weight-loss metering scale, and carrying out melt blending extrusion to obtain the polycarbonate alloy material without a toner point.
Comparative example 1(PC pellets-PET pellets-ABS high rubber powder)
The raw material formula is as follows:
80 parts of PC granules, 10 parts of thermoplastic resin (PET granules), 5.0 parts of ABS high rubber powder, 0.5 part of toner and 4.5 parts of other components (4.0 parts of filler and 0.5 part of antioxidant).
The preparation process comprises the following steps:
(1) weighing PC granules, PET granules, ABS high-adhesive powder, toner and other components according to the formula dosage for later use;
(2) after PC granules are put into a high-speed mixer, starting the high-speed mixer, then putting PET granules into the high-speed mixer in the high-speed operation process, carrying out high-speed mixing, then sequentially putting ABS high-rubber powder, other components and toner into the high-speed mixer in the high-speed operation process, and then continuously carrying out high-speed mixing to obtain a premix; wherein the rotating speed of the high-speed mixer is 400-900r/min when the high-speed mixer is used for high-speed mixing;
(3) and adding the obtained premix into a double-screw extruder through a weight-loss metering scale, and carrying out melt blending extrusion to obtain the polycarbonate alloy material.
Comparative example 2(PC pellets-PET pellets-ABS high rubber powder)
The raw material formula is as follows:
40 parts of PC granules, 30 parts of thermoplastic resin (PET granules), 40 parts of ABS high rubber powder, 3.0 parts of toner and 7.0 parts of other components (5.5 parts of filler and 1.5 parts of antioxidant).
The preparation process comprises the following steps:
as in comparative example 1.
Comparative example 3(PC pellets-PET pellets-PC powder-ABS high rubber powder)
The raw material formula is as follows: (same as in embodiment 1)
10 parts of PC powder, 40 parts of PC granules, 5 parts of thermoplastic resin (PET granules), 15.0 parts of ABS high rubber powder, 1.0 part of toner and 29.0 parts of other components (25.0 parts of filler and 5.0 parts of antioxidant).
The preparation process comprises the following steps:
(1) weighing PC powder, PC granules, thermoplastic resin granules, ABS high-rubber powder, toner and other components according to the formula dosage for later use;
(2) after PC granules are put into a high-speed mixer, starting the high-speed mixer, then putting thermoplastic resin granules into the high-speed mixer in the high-speed operation process for high-speed mixing, and then sequentially putting PC powder, ABS high-rubber powder, other components and toner into the high-speed mixer in the high-speed operation process for high-speed mixing to obtain a premix; wherein the rotating speed of the high-speed mixer is 400-900r/min when the high-speed mixer is used for high-speed mixing;
(3) and adding the obtained premix into a double-screw extruder through a weight-loss metering scale, and carrying out melt blending extrusion to obtain the polycarbonate alloy material.
Comparative example 4(PC powder-ABS high rubber powder-PC pellet-PBT pellet)
The raw material formula is as follows: (same as embodiment 2)
30 parts of PC powder, 50 parts of PC granules, 5 parts of thermoplastic resin (PBT granules), 5.0 parts of ABS high rubber powder, 2.0 parts of toner and 9.0 parts of other components (6.0 parts of filler and 3.0 parts of antioxidant).
The preparation process comprises the following steps:
(1) weighing PC powder, PC granules, thermoplastic resin (PBT granules), ABS high-rubber powder, toner and other components according to the formula dosage for later use;
(2) starting the high-speed mixer after the PC powder is put into the high-speed mixer, then putting ABS high-rubber powder into the high-speed mixer for high-speed mixing in the high-speed operation process, and then continuously carrying out high-speed mixing after PC granules, PBT granules, other components and the toner are sequentially put into the high-speed mixer in the high-speed operation process to obtain a premix; wherein the rotating speed of the high-speed mixer is 400-900r/min when the high-speed mixer is used for high-speed mixing;
(3) and adding the obtained premix into a double-screw extruder through a weight-loss metering scale, and carrying out melt blending extrusion to obtain the polycarbonate alloy material.
Comparative example 5(PC powder-PC pellet-ABS high rubber powder-PP pellet)
The raw material formula is as follows: (same as in embodiment 3)
10 parts of PC powder, 77 parts of PC granules, 5 parts of thermoplastic resin (PP granules), 5.0 parts of ABS high rubber powder and 3.0 parts of toner.
The preparation process comprises the following steps:
(1) weighing PC powder, PC granules, thermoplastic resin (PP granules), ABS high-rubber powder and toner according to the formula dosage;
(2) starting the high-speed mixer after the PC powder is put into the high-speed mixer, then putting PC granules into the high-speed mixer in the high-speed operation process for high-speed mixing, and then continuously mixing the ABS high-rubber powder, the PP granules and the toner into the high-speed mixer in turn in the high-speed operation process to obtain a premix; wherein the rotating speed of the high-speed mixer is 400-900r/min when the high-speed mixer is used for high-speed mixing;
(3) and adding the obtained premix into a double-screw extruder through a weight-loss metering scale, and carrying out melt blending extrusion to obtain the polycarbonate alloy material.
When the melt blending extrusion is performed using a twin-screw extruder as described in step (3) of all of the above specific examples and comparative examples, the process parameters of the twin-screw extruder are as follows: the temperature from the charging opening to the neck mold is set to be 90-110 ℃ in one section, 230 ℃ in the second section, 250 ℃ in the third section, 230 ℃ in the fourth section, 250 ℃ in the fifth section, 230 ℃ in the sixth section, 250 ℃ in the seventh section, and the temperature of the head is 230 ℃ in the first section; wherein the rotating speed of the screw is 500rpm, and the extrudate is cooled, air-dried and granulated to obtain the polycarbonate alloy material.
And (3) injection molding the dried polycarbonate alloy material through an injection molding machine, and carrying out glossiness test and appearance toner dot observation on the sample, wherein the glossiness is tested according to GB8807-88, the appearance toner dot is observed by adopting a magnifying glass with a light source, and the test result is shown in Table 2.
TABLE 2 appearance and toner dot test results for samples of specific examples 1-6 and comparative examples 1-5
As can be seen from the comparison between the specific examples and the comparative examples, the production process is optimized in two aspects according to the principle that the larger the specific surface area of the substance, the better the dispersibility: firstly, the formula is optimized, the condition that only granular resin or only powder resin is used in the traditional process is changed, and polycarbonate granules and polycarbonate powder are used simultaneously; secondly, the method adjusts a material mixing process, the feeding sequence of the granules and the powder is mainly adjusted, the materials are fed according to the crossed material mixing sequence of the granules, the powder, the granules and the powder, the polycarbonate powder and the high rubber powder are respectively inserted between the polycarbonate granules and the thermoplastic resin granules, the polycarbonate granules and the high rubber powder are mixed and added at high speed in the whole adding process, the spatial dispersibility of the granules and the powder is better than that of the granules and the powder before optimization, and the polycarbonate granules and the thermoplastic resin granules can also play a role in stirring in the powder, so that the uniform material mixing of all the materials can be fully ensured. The colorless powder point polycarbonate alloy material prepared by the method does not change the types of the raw material components, and only changes the form of the same resin raw material and the feeding sequence process, so that the final product has good comprehensive performance, high glossiness of the product part, uniform and smooth surface and colorless powder points.
The above description of the embodiments is only intended to facilitate the understanding of the method of the invention and its core idea. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (8)
1. A production process for improving the color point of a polycarbonate alloy material is characterized by comprising the following steps: the method comprises the following steps:
(1) weighing polycarbonate powder, polycarbonate granules, thermoplastic resin granules, ABS high-rubber powder, toner and other components according to the formula dosage for later use; the components are as follows by weight: 10-30 parts of polycarbonate powder, 40-80 parts of polycarbonate granules, 5-30 parts of thermoplastic resin granules, 5-40 parts of ABS high rubber powder, 0.5-3.0 parts of toner and 0-30 parts of other components; the particle size of the polycarbonate powder is 20-300 meshes, and the particle size of the ABS high-rubber powder is 400-2000 meshes;
(2) after polycarbonate granules are put into a high-speed mixer, starting the high-speed mixer, then putting polycarbonate powder into the high-speed mixer in the high-speed operation process for high-speed mixing, and then sequentially putting thermoplastic resin granules, ABS high-rubber powder, other components and toner into the high-speed mixer in the high-speed operation process for high-speed mixing to obtain a premix; wherein the rotating speed of the high-speed mixer is 400-900r/min when the high-speed mixer is used for high-speed mixing;
(3) adding the obtained premix into a double-screw extruder through a weight-loss metering scale, and carrying out melt blending extrusion to obtain a polycarbonate alloy material without a toner point;
wherein the thermoplastic resin pellets in the step (1) are thermoplastic resin in a particle state capable of being subjected to blending modification with polycarbonate, and the thermoplastic resin pellets are at least one of ABS, PE, PP, PET, PBT and PS;
the melt blending extrusion process parameters of the double-screw extruder in the step (3) are as follows: the temperature of the first section is 90-110 ℃, the temperature of the second section is 230-.
2. The process for improving the color point of polycarbonate alloy material according to claim 1, wherein: in the step (1), the polycarbonate powder and the polycarbonate granules are at least one of aromatic polycarbonate, aliphatic polycarbonate, aromatic-aliphatic polycarbonate and branched polycarbonate, and the viscosity average molecular weight of the polycarbonate powder and the polycarbonate granules is 13000-40000.
3. The process for improving the color point of polycarbonate alloy material according to claim 2, wherein: the polycarbonate powder and the polycarbonate granules are both aromatic polycarbonate with the viscosity-average molecular weight of 17000-24000.
4. The process for improving the color point of polycarbonate alloy material according to claim 1, wherein: the other components in the step (1) are at least one of a filler, a flame retardant, a toughening agent, a weather resisting agent, a compatilizer, an antioxidant and a chain extender.
5. A colorless powder point polycarbonate alloy material produced by the production process as claimed in any one of claims 1 to 4, wherein: the composition comprises the following components in parts by weight: 10-30 parts of polycarbonate powder, 40-80 parts of polycarbonate granules, 5-30 parts of thermoplastic resin granules, 5-40 parts of ABS high-rubber powder, 0.5-3.0 parts of toner and 0-30 parts of other components, wherein the particle size of the polycarbonate powder is 20-300 meshes, and the particle size of the ABS high-rubber powder is 400-2000 meshes.
6. The colorless powder point polycarbonate alloy material of claim 5, wherein: the polycarbonate powder and the polycarbonate granules are at least one of aromatic polycarbonate, aliphatic polycarbonate, aromatic-aliphatic polycarbonate and branched polycarbonate, and the viscosity average molecular weight of the polycarbonate powder and the polycarbonate granules is 13000-40000.
7. The colorless powder point polycarbonate alloy material of claim 5, wherein: the thermoplastic resin pellet is a thermoplastic resin in a particle state which can be subjected to blending modification with polycarbonate, and the thermoplastic resin pellet is at least one of ABS, PE, PP, PET, PBT and PS.
8. The colorless powder point polycarbonate alloy material of claim 5, wherein: the other components are at least one of filler, flame retardant, toughening agent, weather resisting agent, compatilizer, antioxidant and chain extender.
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| CN101974216A (en) * | 2010-10-29 | 2011-02-16 | 大河宝利材料科技(苏州)有限公司 | Halogen-free flame-retardant PC/ABS alloy |
| WO2013060687A1 (en) * | 2011-10-26 | 2013-05-02 | Bayer Intellectual Property Gmbh | Stabilized polycarbonate compositions comprising mixtures of silicic acid and an inorganic acid |
| CN108219429A (en) * | 2018-02-01 | 2018-06-29 | 浙江马新材料有限公司 | A kind of power PC/ABS alloy material and preparation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101974216A (en) * | 2010-10-29 | 2011-02-16 | 大河宝利材料科技(苏州)有限公司 | Halogen-free flame-retardant PC/ABS alloy |
| WO2013060687A1 (en) * | 2011-10-26 | 2013-05-02 | Bayer Intellectual Property Gmbh | Stabilized polycarbonate compositions comprising mixtures of silicic acid and an inorganic acid |
| CN108219429A (en) * | 2018-02-01 | 2018-06-29 | 浙江马新材料有限公司 | A kind of power PC/ABS alloy material and preparation method thereof |
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