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Preparation method of cross-linked polystyrene with high light transmittance

A cross-linked polystyrene, high light transmittance technology, applied in the field of polymer materials, can solve the problems of inevitable volume shrinkage of the reaction system, uneven network structure distribution, limited product material purity, etc., to achieve excellent optical properties and media. Electrical properties, solving the problem of volume shrinkage, and improving the effect of compactness

Inactive Publication Date: 2015-06-03
WUHAN UNIV OF TECH
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Problems solved by technology

[0004] Although the two preparation technologies are relatively mature, the polymerization process still has the following defects: First, in the cross-linking polymerization stage of the two processes, the volume shrinkage of the reaction system is inevitable, and the distribution of shrinkage points is uneven, which will lead to the formation of the material. The density is not high, the distribution of the network structure is uneven, and defects such as bubbles and cracks may even occur; the second is that high-temperature initiators are used in the two processes, and their decomposition products will remain in the material system, resulting in limited purity of the product material

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preparation example Construction

[0025] The invention provides a kind of preparation method of high light transmittance cross-linked polystyrene, the method comprises the following steps:

[0026] 1. Preparation of polystyrene mixed solution: dissolve polystyrene powder with styrene to obtain polystyrene solution with a viscosity of 500-3000mPa·s, and then mix polystyrene solution with Divinylbenzene is mixed evenly to obtain the first layer of mixed solution;

[0027] 2. "Layer-by-layer freezing" and "layer-by-layer irradiation": Pour the first layer of mixed solution into an open flat-bottomed mold with a thickness of 0.1mm to 3.3mm, and then place the mold in liquid nitrogen or ethanol freezing liquid. The liquid level of the freezing liquid is lower than the edge of the mold, and it is placed for a period of time until the first layer of mixed solution becomes the first layer of transparent solidified body. The high-energy electron radiation dose rate is adjusted between 50Gy / min-500Gy / min, and the first...

Embodiment 1

[0030] 1) Obtain a polystyrene solution by dissolving styrene, a polystyrene powder with a viscosity of 2000mPa·s, and then configure a first-layer mixed solution of a polystyrene solution and divinylbenzene with a mass ratio of 1000:50;

[0031] 2) Then pour the first layer of mixed solution into the open mold with a flat bottom surface, place the mold in liquid nitrogen / ethanol mixed freezing liquid, and freeze until the first layer of mixed solution becomes the first layer of transparent solidified body;

[0032] 3) Utilizing high-energy electrons to irradiate and cross-link the first layer of transparent solidified body;

[0033] 4) Obtain the second layer of mixed solution according to the method of step 1);

[0034] 5) Pour the second layer of mixed solution in step 4) into the mold of the first layer of transparent solidified body that has undergone radiation crosslinking treatment in step 3), and the freezing liquid is frozen until the second layer of mixed solution be...

Embodiment 2

[0038] 1) Obtain a polystyrene solution by dissolving styrene, a polystyrene powder with a viscosity of 2000mPa·s, and then configure a first-layer mixed solution of a polystyrene solution and divinylbenzene with a mass ratio of 1000:20;

[0039] 2) Then pour the first layer of mixed solution into the open mold with a flat bottom surface, place the mold in liquid nitrogen / ethanol mixed freezing liquid, and freeze until the first layer of mixed solution becomes the first layer of transparent solidified body;

[0040] 3) Utilizing high-energy electrons to irradiate and cross-link the first layer of transparent solidified body;

[0041] 4) Obtain the second layer of mixed solution according to the method of step 1);

[0042] 5) Pour the second layer of mixed solution in step 4) into the mold of the first layer of transparent solidified body that has undergone radiation crosslinking treatment in step 3), and the freezing liquid is frozen until the second layer of mixed solution be...

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Abstract

The invention discloses a preparation method of cross-linked polystyrene with high light transmittance, and belongs to the field of cross-linking polymerization of polymers. The method comprises steps as follows: 1), a polystyrene solution is prepared and uniformly mixed with divinyl benzene in a certain proportion; 2), the mixed solution is subjected to freezing layer by layer and high-energy electron irradiation layer by layer; 3), later forming of a cross-linked polystyrene material is completed through a temperature control process. The method has the main characteristics as follows: a product is pure and transparent and doesn't have defects of bubbles, impurities and the like; 2) the cross-linking polymerization process is performed at an ultralow temperature, and the product qualification ratio is high; 3), the product has excellent light transmittance, stable dielectric property, higher processing mechanical property and the like.

Description

technical field [0001] The invention belongs to the field of polymer materials, and in particular relates to a preparation method of cross-linked polystyrene with high light transmittance. Background technique [0002] Cross-linked polystyrene is a non-toxic, odorless, colorless and transparent thermosetting plastic with low density, good dimensional stability, easy processing, high dielectric strength, strong anti-radiation aging ability, and light transmittance as high as 90%, so it can be Widely used in optical lenses, high-voltage equipment and other fields, it plays the role of optical transmission, electrical insulation and structural support. [0003] At present, there are mainly two methods for the preparation of large-scale cross-linked polystyrene materials in China. One is the method of programmed temperature-controlled bulk polymerization proposed by the inventor of this patent. In this method, styrene and initiator are pre-polymerized at high temperature, and th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F257/02C08F212/08C08F212/36C08F2/54
Inventor 朱泉峣牟广营俞悦万方超孙华君陈文
Owner WUHAN UNIV OF TECH
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