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High-transparency, high-hardness and low-birefringence polycarbonate as well as preparation method and application thereof

A technology of polycarbonate and low birefringence, which is applied in the field of high transparency, high hardness and low birefringence polycarbonate and preparation, can solve the problems of materials with large shrinkage ratio, uneven monomer distribution, and affecting the use of materials, etc., to achieve Good processability, excellent light transmittance and scratch resistance, effect of excellent scratch resistance

Active Publication Date: 2022-07-19
WANHUA CHEM GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this difference in polymerization activity often leads to uneven distribution of polymerized monomers in the molecular chain or even in the form of blocks. The uneven distribution of polymer molecular chains often affects the properties of the material, such as the double in Chinese patent CN108291017B. When phenol A is copolymerized with siloxane, because the two chain segments formed after polymerization are incompatible, the phase separation of the material will affect its optical properties such as light transmittance. Due to the incompatibility of the two phases, the parts during processing and molding It is also easy to form aesthetic defects such as "gate halo" and "stripe"; and due to the uneven distribution of monomers, the large difference in shrinkage rate during the molding and cooling process of the material leads to obvious internal stress in the material, which is manifested by obvious high birefringence. Influencing the use of materials in optics

Method used

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  • High-transparency, high-hardness and low-birefringence polycarbonate as well as preparation method and application thereof
  • High-transparency, high-hardness and low-birefringence polycarbonate as well as preparation method and application thereof
  • High-transparency, high-hardness and low-birefringence polycarbonate as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0075] To prepare the compound shown in formula VI (preparation of FDCP from FDCC), the molar ratio of 2,5-furandicarbonyl chloride to phenol is 1:2.2;

[0076] 15.609kg (80mol) of 2,5-furandicarbonyl chloride (FDCC) was dissolved in 15.609kg of methylene chloride, added to the 100L reactor equipped with a polytetrafluoroethylene stirring paddle, and 16.73kg (176mol) of phenol was added. It was dissolved in 19.76 kg of dichloromethane, and the phenol / dichloromethane solution was added dropwise to the FDCC / dichloromethane solution within 1 hour through a constant pressure feeding device. The mixture was heated to 50°C, and the dichloromethane was distilled off by feeding nitrogen with stirring to obtain a crude FDCP product. The crude FDCP product was recrystallized in ethanol, and the crystallized FDCP crystals were dried in a vacuum drying oven at 160°C for 3 hours to obtain Pure FDCP, by 1H NMR ( figure 1 ) analyze its structure as

[0077] by liquid chromatography ( f...

Embodiment 2

[0079] To prepare the compound shown in formula VI (preparation of FDCP from FDCC), the molar ratio of 2,5-furandicarbonyl chloride to phenol is 1:2.5;

[0080] 15.609kg (80mol) 2,5-furandicarbonyl chloride (FDCC) was dissolved in 15.609kg monochlorobenzene, added to the 100L reactor equipped with a polytetrafluoroethylene stirring paddle, 19.00kg (202mol) Phenol was dissolved in 19.76kg of monochlorobenzene, and the phenol / monochlorobenzene solution was added dropwise to the FDCC / monochlorobenzene solution within 1 h through a constant pressure feeding device. After the reaction was completed, the mixture was heated to 50°C, and the monochlorobenzene was distilled off by feeding nitrogen with stirring to obtain a crude FDCP product. The crude FDCP product was recrystallized in ethanol, and the crystallized FDCP crystals were dried in a vacuum oven at 160°C. After drying for 3 h, pure FDCP was obtained. The structure of the FDCP was analyzed as formula (VI), and the purity was...

Embodiment 3

[0082] To prepare the compound shown in formula VI (preparation of FDCP from FDCC), the molar ratio of 2,5-furandicarbonyl chloride to phenol is 1:2.7;

[0083] 15.609kg (80mol) 2,5-furandicarbonyl chloride (FDCC) was dissolved in 15.609kg o-dichlorobenzene, added to the 100L reactor equipped with a polytetrafluoroethylene stirring paddle, 20.53kg (218mol) ) Phenol was dissolved in 19.76kg o-dichlorobenzene, and the phenol / o-dichlorobenzene solution was added dropwise to the FDCC / o-dichlorobenzene solution within 1 h through the constant pressure feeding device, and continued at 30°C after the dropwise addition was completed. The reaction was stirred for 2 h. After the reaction was completed, the mixture was heated to 50° C., and the ortho-dichlorobenzene was distilled off by introducing nitrogen gas under stirring to obtain a crude FDCP product. The crude FDCP product was recrystallized in ethanol. It was dried in a vacuum drying oven at 160° C. for 3 hours to obtain pure FDC...

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Abstract

The invention relates to polycarbonate with high transparency, high hardness and low birefringence as well as a preparation method and application thereof, the polycarbonate comprises A) a repetitive unit containing furan and cyclohexane structures, and the structure of the repetitive unit is shown as a formula I; and B) a repetitive unit containing a cyclohexane structure, wherein the structure is shown as a formula II. And the spacing degree of the furan ring structure in the molecular chain is greater than or equal to 2, so that the polycarbonate prepared by the invention has more excellent transparency and hardness and extremely low birefringence, and can be applied to various fields.

Description

technical field [0001] The invention relates to a polycarbonate with high transparency, high hardness and low birefringence, a preparation method and application thereof, in particular to a polycarbonate derived from a bio-based monomer and a preparation method. Background technique [0002] As an engineering plastic, polycarbonate has the advantages of excellent impact resistance, transparency, and good processability, and is widely used in many fields such as automobiles, electronic appliances, construction, food and medicine. Polycarbonates can be divided into aliphatic, aromatic, aliphatic-aromatic copolymers and other types according to their structure. Aliphatic and aliphatic-aromatic copolycarbonates have low mechanical properties and have no practical value. At present, only based on bisphenol A's aromatic polycarbonates have been well developed and produced on a large scale. [0003] On the one hand, bisphenol A comes from non-recyclable petrochemical resources. Wi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G64/30C08G64/16C08L69/00
CPCC08G64/305C08G64/1608C08L69/00C08G2230/00C08L2201/08C08L2201/06
Inventor 王玉彬李凤闯魏志涛黎雷李强隋东武张怀强王晓东曾伟王磊
Owner WANHUA CHEM GRP CO LTD
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