CN115678239A - Preparation method of polycarbonate composition, polycarbonate composition and application thereof - Google Patents
Preparation method of polycarbonate composition, polycarbonate composition and application thereof Download PDFInfo
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Abstract
The invention provides a preparation method of a polycarbonate composition, the polycarbonate composition and application thereof, wherein polycarbonate with a structure shown in a formula (I) is prepared, the end capping rate is controlled to be 50-96%, and the prepared polycarbonate is blended with general polycarbonate to prepare polycarbonate blends with different heat-resistant grades.
Description
Technical Field
The invention belongs to the technical field of polycarbonate compositions, and particularly relates to a preparation method of a polycarbonate composition, the polycarbonate composition and application thereof.
Background
BPTMC (1,1-bis- (4-hydroxyphenyl) -3,3,5-trimethylcyclohexane) and BPA (bisphenol A) are used as comonomers to synthesize the special polycarbonate with higher heat resistance grade, and the special polycarbonate can be applied to some special high-temperature resistant fields. Aiming at different application scenes, the monomer proportion is often required to be regulated and controlled and different experimental parameters are designed for the consideration of performance and cost so as to synthesize the high-temperature resistant polycarbonates with different heat-resistant grades. In the actual production process, the polycarbonate with different grades is frequently switched, so that more auxiliary materials and transition materials are brought, and the production cost is increased. Therefore, a preparation method is urgently needed to be developed, namely, the production of different heat-resistant grade marks is realized by the production of single-grade products and the blending technology. BPTMC is used as a comonomer with a larger rigid structure, and the impact resistance is to be improved. In addition, as a polycarbonate, the aging resistance of the polycarbonate also has room for improvement. The polycarbonate chain segment is subjected to crosslinking reaction, so that the impact resistance and the aging resistance of the material can be effectively improved. Based on this, in order to improve the overall properties of polycarbonates, the prior art has attempted to:
chinese patent CN105462226A describes a composition containing polycarbonate and specific acrylate with BPTMC and BPA structures, and the improvement of the heat resistance and the optical performance of the composition can be realized by adjusting the corresponding proportion of each component, but the improvement temperature range is limited, and the effect on the aging resistance is not mentioned.
Chinese patent CN101516967B describes copolycarbonates comprising 3,3-bis (4-hydroxyphenyl) -1-phenyl-1H-indol-2-one and 2,2-bis (4-hydroxyphenyl) -1-phenyl-1H-indol-3-one structures (isomer mixtures), which by introducing a polyphenolic ring structure can significantly increase the glass transition temperature of the copolycarbonates and improve the adhesion to metals, but does not mention the performance in terms of aging properties.
Disclosure of Invention
In view of the above problems in the prior art, the present invention aims to provide a method for preparing a polycarbonate composition, which can improve the comprehensive properties of the polycarbonate blend, such as heat resistance, chemical resistance, impact resistance, aging resistance, etc., by preparing a polycarbonate with a specific end capping rate and a BPTMC structure, blending the polycarbonate with a general polycarbonate to prepare polycarbonate blends with different heat resistance grades, and adding a second end capping agent under extrusion conditions.
Another object of the present invention is to provide a polycarbonate composition.
It is a further object of the present invention to provide a polycarbonate composition.
In order to realize the purpose, the invention adopts the following technical scheme:
the invention provides a preparation method of a polycarbonate composition, which comprises the following steps:
1) Preparing polycarbonate containing a structure of a formula (I), and controlling the end capping rate to be 50-96%:
wherein R1 and R2 are respectively and independently selected from H, C-C5 alkyl, preferably H and methyl; r3 and R4 are independently selected from alkyl of H, C-C5, preferably H, methyl; m and n are respectively and independently 0, 1, 2, 3 and 4, preferably 0 and 1;
2) Blending the polycarbonate prepared in the step 1) with optional general polycarbonate to obtain a polycarbonate blend;
3) Extruding and granulating the polycarbonate blend obtained in the step 2) through an extruder, and adding a second end-capping reagent for reaction to obtain the polycarbonate composition.
In a preferred embodiment, in step 1), the polycarbonate comprising the structure of formula (I) has an end-capping rate of 50 to 96%, preferably 60 to 80%, more preferably 65 to 75%;
the weight-average molecular weight of the polycarbonate containing the structure of the formula (I) is 15000-50000, preferably 20000-35000;
the preparation method of the polycarbonate containing the structure of the formula (I) is not particularly required, and the polycarbonate can be synthesized by a well-known ester exchange method or a phosgene method;
for example, the polycarbonate containing the structure of formula (I) can be prepared by referring to the method disclosed in CN101023118a, and preferably, in some specific examples, the polycarbonate is prepared by homopolymerization of monomer 1,1-bis- (4-hydroxyphenyl) -3,3,5-trimethylcyclohexane in the presence of organic solvent, chain terminator, catalyst and phosgene, and the specific operation steps and parameters can be defined as required by the skilled person referring to the prior art, and the invention is not particularly required.
In a preferred embodiment, in step 1), the polycarbonate having a structure represented by formula (I) is specifically a polycarbonate having a structure represented by formula (II):
in a preferred embodiment, in step 2), the general polycarbonate is selected from aromatic polycarbonates, more preferably a bisphenol A polycarbonate, such as Wanhua PC-
2070、
2100、
2220。
In a preferred embodiment, in step 2), the blending mass ratio of the polycarbonate comprising the structure of formula (I) to the general polycarbonate is from 1.
In a preferred embodiment, in step 3), the second end-capping agent is selected from unsaturated olefin end-capping agents, preferably olefin diimide N-substituted phenols, more preferably compounds of formula (III), i.e. 1- (4-hydroxyphenyl) pyrrole-2,5-dione, and/or compounds of formula (IV), i.e. 2- (4-hydroxyphenyl) -3a,4,7 a-tetrahydro-1H-4,7-methylindole-1,3 (2H) -dione:
in a preferred embodiment, the second end-capping reagent is added in step 3) in an amount of 1 to 30 wt.%, preferably 10 to 20 wt.%, based on the mass of the polycarbonate blend.
In a preferred embodiment, in the step 3), the second end-capping reagent is added during the extrusion granulation process for reaction, the reaction is carried out during the extrusion process of a double-screw extruder, and the temperature of the extrusion process is 270-350 ℃, preferably 310-330 ℃; the screw rotation speed is 60-100r/min, preferably 80-90r/min.
The invention also provides a polycarbonate composition prepared by the method.
The polycarbonate composition has a heat distortion temperature of 155-205 ℃, a Vicat softening temperature of 175-230 ℃ (50N, 120 ℃/h, tested according to ISO306 method), an impact strength of 550-850J/m at-40 ℃ and an impact strength of 300-450J/m at-60 ℃.
The polycarbonate composition disclosed by the invention also has good chemical resistance, and the retention rate of the elongation at break of the polycarbonate composition is more than 90% after the polycarbonate composition is soaked in ethyl acetate for 24 hours at normal temperature.
After the polycarbonate composition disclosed by the invention is tested by a 'double 85' experiment, the tensile strength retention rate can be changed within the range of 90-96%.
The polycarbonate composition according to the invention may additionally comprise various conventional additives conventionally added to thermoplastic resins in proportions of from 0 to 5% by weight, for example from 0.1% by weight, 0.5% by weight, 1.0% by weight, 2.0% by weight, 3.0% by weight, preferably from 0 to 2.5% by weight, more preferably from 0 to 2% by weight, relative to the total weight of the copolycarbonate composition;
preferably, the conventional additive is selected from any one of or a combination of at least two of a flow aid, a heat stabilizer, a hydrolysis stabilizer, a UV absorber, a flame retardant, an antistatic agent, a pigment, and a reinforcing filler;
the polycarbonate composition of the present invention can be prepared by compounding the above conventional additives, or by mixing the respective components in a known manner, melt-compounding and melt-extruding in a conventional apparatus such as an internal mixer, an extruder and a twin-screw kneader, and granulating by a granulator.
The polycarbonate composition can be applied to the fields of car lamps, medical instruments, water barrels and the like.
The polycarbonate composition of the invention forms polycarbonate by BPTMC homopolymerization, controls the end capping rate, and then is mixed with general polycarbonate to prepare polycarbonate blends with different heat-resisting grades, which can reduce the side-brand materials and transition materials generated in the production process and reduce the production cost. Meanwhile, in the extrusion granulation process, a second end-capping reagent such as unsaturated olefins is added, so that partial polycarbonate chain segments are subjected to a crosslinking reaction, and the chemical resistance, the impact resistance and the aging resistance of the whole polycarbonate composition can be obviously improved.
Compared with the prior art, the technical scheme of the invention has the beneficial effects that:
according to the invention, the polycarbonate blend with different heat-resistant grades can be prepared by synthesizing the homopolycarbonate containing the structure shown in the formula (I), controlling the end-capping rate of the homopolycarbonate, and blending the homopolycarbonate with the general polycarbonate, and the second end-capping agent is added in the extrusion process, so that partial polymer chain segments are crosslinked, and the polycarbonate composition with heat resistance, chemical resistance, impact resistance and aging resistance can be obtained while the production cost is reduced, and can be applied to some special fields.
Detailed Description
The following examples will further illustrate the method provided by the present invention in order to better understand the technical solution of the present invention, but the present invention is not limited to the listed examples, and should also include any other known modifications within the scope of the claims of the present invention.
The following examples and comparative examples of the present invention were prepared from the following raw materials, which were otherwise common commercial raw materials unless otherwise specified:
BPTMC: michelin Biochemical technology Ltd, purity > 99%;
bisphenol Z: michelin Biochemical technology Ltd, purity > 99%;
bisphenol AP: shanghai Aladdin Biotechnology, inc., 98%;
p-tert-butylphenol: aladdin reagent, inc., purity > 99%;
general purpose polycarbonate (A)
2070. 2100, 2220): vanhua chemical group, inc.;
1- (4-hydroxyphenyl) pyrrole-2,5-dione (compound of formula III, 4-maleimidophenol, CAS: 7300-91-6): beijing Bailingwei science and technology, inc., 97%;
3-diethylaminophenol: beijing Bailingwei science and technology Co., ltd;
2- (4-hydroxyphenyl) -3A,4,7, 7A-tetrahydro-1H-4,7-methylindole-1,3 (2H) -dione (compound of formula IV, CAS: 10308-54-0): shanghai Haohong biological medicine science and technology Limited, 97%;
antioxidant (beta- (3,5-di-tert-butyl-4-hydroxyphenyl) n-octadecyl propionate): aladdin reagents Ltd:
mold release agent (pentaerythritol stearate): aladdin reagents, inc.
The main properties of the polycarbonate compositions prepared in the examples of the present invention and the comparative examples were measured by the following methods:
1. "Dual 85" aging test (conditions: 85 ℃/85% RH): the polycarbonate composition pellets are injection-molded into 80X 10X 4 (mm) sample strips, then a part of the sample strips are placed in a constant temperature and humidity test chamber (model: GMATG-HTHH), an aging test is carried out for 1000 hours according to GB/T2423.3-2006, and after the test is finished, the sample strips are taken out and placed in a constant temperature drying chamber to be kept away from light.
2. Tensile strength and elongation at break: the test was carried out according to ISO527 by means of a universal tester, and two batches of samples were tested in the above performance tests, namely before and after the chemical resistance test and before and after the ageing test.
3. Vicat softening temperature: the test was carried out according to ISO306 (B120).
4. Heat distortion temperature: the test was carried out according to ISO 75-1/2.
5. Impact strength: testing was performed according to ASTM D256.
Example 1
Preparation of a polycarbonate composition: preparing polycarbonate containing a structure shown in a formula (I) by a phosgene method, controlling the end capping rate of the polycarbonate to be 60% by adjusting the excess phosgene rate and the blending mass ratio of the polycarbonate to general polycarbonate to be 10% by taking BPTMC as a monomer, wherein the addition amount of a second end capping agent is 4.5wt% in the extrusion process;
the reaction formula of the phosgene method for preparing the polycarbonate containing the structure of the formula (I):
the method comprises the following steps:
1) Taking a 30L reaction kettle with a stirring paddle, starting stirring, introducing nitrogen for protection, introducing 30 ℃ constant temperature water into a jacket, adding 820g (20.5 mol) of NaOH solid, 3.48g (0.02 mol) of sodium hydrosulfite and 13500g (750 mol) of deionized water, adding 3100g (10 mol) of BPTMC after the solid is completely dissolved, adding 15000g (176.5 mol) of dichloromethane after the solid is completely dissolved, introducing phosgene for interfacial polycondensation reaction at the reaction temperature of 26 ℃ for 30min, controlling the phosgene amount in the system to be 30 percent excessive relative to the BPTMC molar amount in the system in the step, namely 1287g (13 mol), and continuously introducing for 30min. Then 30g (0.2 mol) of p-tert-butylphenol was added to the reaction kettle, and after complete dissolution, 600g of a 1wt% triethylamine solution (triethylamine 0.006mol, solvent dichloromethane) was added dropwise for 60min, while controlling the reaction kettle temperature at 35 ℃ and an aqueous solution of NaOH 32wt% was added dropwise to the reaction kettle so that the total molar amount of NaOH added was 450% of the total molar amount of excess phosgene, and the dropwise addition was continued for 60min to obtain a polymer reaction solution.
After the reaction is finished, separating and collecting the oil phase, adding 4L of 0.4mol/L hydrochloric acid for washing, after the acid washing is finished, collecting the oil phase, and adding 10L of deionized water for washing until the conductivity is less than 100 mu s/cm. The oil phase was then freed from the solvent and dried to give a polycarbonate resin (No. a 1) having a weight-average molecular weight of 25368.
2) Weighing 300g of the polycarbonate resin a1 obtained in the step 1) and 2700g of universal polycarbonate Wanhua PC-
2070, followed by a blending operation by a blender, to obtain a polycarbonate blend b1.
3) Extruding and granulating the polycarbonate blend b1 obtained in the step 2). First, 135g (0.71 mol) of the second end-capping reagent of the compound of the formula (III) was added to the polycarbonate blend b1, then 0.04wt% of an antioxidant and 0.3wt% of a mold release agent were added, blending was conducted by a blender, and finally, extrusion granulation was conducted by an extruder at a screw rotation speed of 80r/min and at 300 ℃ to obtain a polycarbonate composition A1, the results of the property tests being shown in Table 1.
Example 2
Referring to example 1, a polycarbonate containing the structure of formula (I) was prepared using BPTMC as a monomer, and the molecular weight of the polycarbonate containing the structure of formula (I) was 24076 by adjusting the phosgene excess rate to control the end capping rate of the polycarbonate to 70%, wherein the phosgene excess rate was 25% and the amount of phosgene added was 1237.5g (12.5 mol).
The blending mass ratio of the polycarbonate containing the structure of the formula (I) to the general polycarbonate is 20, and the adding amount of the second end-capping reagent-the compound of the formula (IV) in the extrusion process is 10wt%.
Except that 500g of polycarbonate containing the structure of formula (I) and 2000g of general polycarbonate Wanhua PC-
2100. 250g (0.98 mol) of the compound of the formula (IV) and the remainder of the process referred to in example 1 gave a polycarbonate composition (code A2) whose results of the performance tests are shown in Table 1.
Example 3
Referring to example 1, a polycarbonate having a structure of formula (I) was prepared using BPTMC as a monomer, and the end capping rate of the polycarbonate was controlled to 80% by adjusting the phosgene excess rate to 20% and the phosgene passing amount to 1188g (12 mol), thereby obtaining a polycarbonate having a molecular weight of 23456.
The blending mass ratio of the polycarbonate containing the structure of the formula (I) to the general polycarbonate is 30, and the addition amount of the second end-capping reagent, the compound of the formula (III), during the extrusion process is 15wt%.
Except for using 600g of polycarbonate containing the structure of the formula (I) and 1400g of universal polycarbonate Wanhua PC-
2220. 300g (1.59 mol) of the compound of the formula (III) and the remaining steps are referred to example 1 to obtain a polycarbonate composition (No. A3), the results of which are shown in Table 1.
Example 4
Referring to example 1, the polycarbonate containing the structure of formula (I) was prepared by using BPTMC as a monomer, and the end capping rate of the polycarbonate was controlled to 90% by adjusting the excess phosgene rate to 15% and the phosgene flow rate to 1138.5g (11.5 mol), to obtain the polycarbonate containing the structure of formula (I) with a molecular weight of 22786.
The blending mass ratio of the polycarbonate containing the structure of the formula (I) to the general polycarbonate is 40, and the addition amount of the second end-capping reagent, namely the compound of the formula (IV), in the extrusion process is 20wt%.
Except that 800g of polycarbonate containing the structure of the formula (I) and 1200g of general polycarbonate Wanhua PC-
2070. Referring to example 1 except for 400g (1.57 mol) of the compound of the formula (IV), a polycarbonate composition (No. A4) was obtained, and the results of the performance test are shown in Table 1.
Example 5
With reference to the method of example 1, a polycarbonate containing the structure of formula (I) is prepared by using BPTMC as a monomer, and the end-capping rate of the polycarbonate is controlled to 93% by adjusting the excess phosgene rate, wherein the excess phosgene rate is 13%, and the phosgene feeding amount is 1118.7g (11.3 mol), so as to obtain the polycarbonate containing the structure of formula (I) and having the molecular weight of 21656.
The blending mass ratio of the polycarbonate containing the structure of the formula (I) to the general polycarbonate is 50, and the addition amount of the second end-capping reagent, the compound of the formula (III), during the extrusion process is 25wt%.
Except that 1000g of polycarbonate containing the structure of formula (I) and 1000g of general polycarbonate Wanhua PC-
2070. 500g (2.65 mol) of the compound of the formula (III) and the remaining steps refer to example 1 to give a polycarbonate composition (No. A5), the results of which are shown in Table 1.
Example 6
Referring to example 1, a polycarbonate containing the structure of formula (I) was prepared using BPTMC as a monomer, and the end capping rate of the polycarbonate was controlled to 95% by adjusting the excess phosgene rate, which was 10%, and the amount of phosgene introduced was 1138.5g (11 mol), to obtain a polycarbonate containing the structure of formula (I) having a molecular weight of 21024.
The blending mass ratio of the polycarbonate containing the structure of the formula (I) to the general polycarbonate is 60, and the adding amount of the second end-capping reagent-the compound of the formula (IV) in the extrusion process is 30wt%.
Except for using 1200g of polycarbonate containing the structure of the formula (I) and 800g of universal polycarbonate Wanhua PC-
2070. 600g (2.35 mol) of the compound of the formula (IV) and the remainder of the procedure referred to in example 1 give a polycarbonate composition (code A6) whose results of the performance tests are shown in Table 1.
Example 7
A polycarbonate composition was prepared by referring to the method of example 1, except that: the raw material BPTMC was replaced with bisphenol Z, and other operations and parameters were unchanged to finally obtain a polycarbonate composition (No. A7), and the results of the performance tests are shown in Table 1.
The reaction equation is as follows:
comparative example 1
A polycarbonate composition was prepared by reference to the method of example 1, except that: the excess phosgene amount was 40%, the phosgene feed amount was 1386g (14 mol), the end-capping rate of the polycarbonate having the structure of the formula (I) was 45%, the weight-average molecular weight was 24879, and the other operations were not changed to prepare a carbonate composition (No. 1), and the results of the performance tests are shown in Table 1.
Comparative example 2
A polycarbonate composition was prepared by referring to the method of example 1, except that: omitting step 2), using only the polycarbonate having the structure of formula (I) for extrusion granulation, the other operations were not changed to obtain a carbonate composition (No. 2), and the results of the performance tests are shown in Table 1.
Comparative example 3
A polycarbonate composition was prepared according to the method of example 1, except that: the polycarbonate with the structure of the formula (I) in the step 1) is omitted, the general polycarbonate is directly used for extrusion granulation in the step 3), the other operations are not changed, the carbonate composition (No. 3) is prepared, and the performance test results are shown in the table 1.
Comparative example 4
A polycarbonate composition was prepared by referring to the method of example 1, except that: no second end-capping reagent was added and the remainder of the operation was unchanged to produce a carbonate composition (No. 4) having the performance test results shown in Table 1.
Comparative example 5
A polycarbonate composition was prepared by referring to the method of example 1, except that: the raw material BPTMC was replaced with bisphenol AP and the other operations were not changed to prepare a carbonate composition (No. 5) having the results of the performance tests shown in Table 1.
Comparative example 6
A polycarbonate composition was prepared by referring to the method of example 1, except that: the second end-capping reagent was replaced with 3-diethylaminophenol, and the other operations were carried out without change, to obtain a carbonate composition (No. 6), the results of which were shown in Table 1.
TABLE 1 results of property testing of polycarbonate compositions prepared in examples and comparative examples
As shown in Table 1, by blending the polycarbonate containing the structure of the formula (I) with general polycarbonate, polycarbonate blends with different heat resistance grades can be prepared, and meanwhile, under the condition of the end capping rate of the polycarbonate with the structure of the formula (I), a second end capping reagent is added, so that the polycarbonate composition is crosslinked, and the comprehensive performance of the polycarbonate composition is favorably improved.
While the present invention has been described in detail with reference to the preferred embodiments, it should be understood that the above description should not be taken as limiting the invention. It will be appreciated by those skilled in the art that modifications or adaptations to the invention may be made in light of the teachings of the present specification. Such modifications or adaptations are intended to be within the scope of the present invention as defined in the claims.
Claims (10)
1. A method of making a polycarbonate composition, comprising the steps of:
1) Preparing polycarbonate containing a structure of a formula (I), and controlling the end capping rate to be 50-96%:
wherein R1 and R2 are respectively and independently selected from H, C-C5 alkyl, preferably H and methyl; r3 and R4 are independently selected from alkyl of H, C-C5, preferably H, methyl; m and n independently represent 0, 1, 2, 3 and 4, preferably 0 and 1;
2) Blending the polycarbonate prepared in the step 1) with optional general polycarbonate to obtain a polycarbonate blend;
3) Extruding and granulating the polycarbonate blend obtained in the step 2) through an extruder, and adding a second end-capping reagent for reaction to obtain the polycarbonate composition.
2. The method according to claim 1, wherein in step 1), the polycarbonate comprising the structure of formula (I) has an end-capping rate of 50 to 96%, preferably 60 to 80%, and more preferably 65 to 75%;
the weight-average molecular weight of the polycarbonate containing the structure of the formula (I) is 15000-50000, preferably 20000-35000;
preferably, the polycarbonate containing the structure of the formula (I) is synthesized by an ester exchange method or a phosgene method.
3. The production method according to claim 1 or 2, wherein in step 1), the polycarbonate having a structure represented by formula (I) is a polycarbonate having a structure represented by formula (II):
4. the method according to any one of claims 1 to 3, wherein in step 2), the general-purpose polycarbonate is selected from aromatic polycarbonates, preferably a bisphenol A polycarbonate.
5. The production method according to claims 1 to 4, characterized in that, in step 2), the polycarbonate comprising the structure of formula (I) and the general-purpose polycarbonate are blended in a mass ratio of 1.
6. The method of any one of claims 1 to 5, wherein in step 3) the second end-capping agent is selected from an unsaturated olefin end-capping agent, preferably an olefinic diimide N-substituted phenol, more preferably a compound of formula (III), i.e. 1- (4-hydroxyphenyl) pyrrole-2,5-dione, and/or a compound of formula (IV), i.e. 2- (4-hydroxyphenyl) -3A,4,7, 7A-tetrahydro-1H-4,7-methylindole-1,3 (2H) -dione:
7. the preparation method according to claims 1 to 6, characterized in that in step 3), the second end-capping agent is added in an amount of 1 to 30wt%, preferably 10 to 20wt%, based on the mass ratio of the polycarbonate blend;
preferably, the second end-capping reagent is added in the extrusion granulation process for reaction, the reaction is carried out in the extrusion process of a double-screw extruder, and the temperature of the extrusion process is 270-350 ℃, preferably 310-330 ℃; the screw rotation speed is 60-100r/min, preferably 80-90r/min.
8. A polycarbonate composition prepared by the method of any of claims 1-7, wherein the heat distortion temperature is 155-205 ℃ and the Vicat softening temperature is 175-230 ℃;
the polycarbonate composition has the impact strength of 550-850J/m at-40 ℃ and the impact strength of 300-450J/m at-60 ℃;
after the polycarbonate composition is soaked in ethyl acetate for 24 hours at normal temperature, the retention rate of the elongation at break of the polycarbonate composition is more than 90 percent;
the polycarbonate composition has a tensile strength retention rate of 90-96% after a 'double 85' test.
9. The polycarbonate composition according to claim 8, further optionally comprising 0-5 wt.%, preferably 0-2.5 wt.%, more preferably 0-2 wt.% of an additive, based on the total weight of the copolycarbonate;
preferably, the additive is selected from any one of or a combination of at least two of a flow aid, a heat stabilizer, a hydrolysis stabilizer, a UV absorber, a flame retardant, an antistatic agent, a pigment, and a reinforcing filler.
10. Use of the polycarbonate composition prepared by the process of any one of claims 1 to 7 or the polycarbonate composition of claim 8 or 9 in the field of automotive lights, medical devices, and water bucket materials.
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