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Method for preparing polyacrylate copolymer resin for optical conduction

A technology of polyacrylate and methyl methacrylate, which is applied in the field of bulk polymerization preparation, can solve problems such as long prepolymerization time, difficulty in controlling the polymerization reaction temperature, and explosion accidents, and achieves improved flexibility, excellent optical properties, and satisfactory The effect of processing applications

Inactive Publication Date: 2012-09-05
内蒙古金瑞明材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The technical defect of this technology is that the prepolymerization time is long, it is difficult to control the polymerization reaction temperature, and it is easy to produce detonation accidents.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] (1) The ratio by weight of methyl methacrylate / methyl acrylate / azobisisobutyronitrile / dodecyl mercaptan is mixed in the ratio of 98 / 2 / 0.00005 / 0.002;

[0037] (2) Transport the above-mentioned raw materials to a 30-liter reactor for preliminary polymerization at a flow rate of 3 kg per hour. The temperature in the reactor is 100° C., the polymerization pressure is 1.5 MPa, and the residence time of the preliminary polymerization is 8.5 hours;

[0038](3) The material in the reactor is continuously conveyed to the vented screw extruder for high-temperature polymerization, and then extruded from the extruder. The inner diameter of the extruder is 30 mm, and the length of the barrel is 1.6 meters. The outlet temperature is 230°C, the screw speed is 100 revolutions per minute, and the unreacted monomer contained in the material is discharged from the exhaust port. The vacuum degree of the first exhaust port of the extruder is controlled at 80kPa, and the vacuum degree of the...

Embodiment 2

[0041] Carry out according to embodiment 1 identical equipment and identical steps, difference is:

[0042] (1) The raw material is: the mass percent of methyl methacrylate / ethyl acrylate / dibenzoyl peroxide / dodecyl mercaptan is 100 / 0.08 / 0.00005 / 0.002;

[0043] (2) The raw material flow rate is 5 kg per hour, the temperature in the reactor is controlled at 80° C., and the polymerization pressure is controlled at 2.0 MPa.

[0044] The residence time of preliminary polymerization is 5.1 hours;

[0045] (3) The temperature of the extruder is 200° C., and the residence time of the high-temperature polymerization reaction is 31 minutes.

[0046] The physical and chemical properties of the obtained product are shown in Table 1.

Embodiment 3

[0048] Carry out according to embodiment 1 identical reactor and identical steps, difference is:

[0049] (1) The raw material is 98 / 2 / 0.00005 / 0.002 mass percent of methyl methacrylate / butyl acrylate / azobisisobutyronitrile / dodecyl mercaptan;

[0050] (2) the residence time of preliminary polymerization is 5.1 hours;

[0051] (3) The extruder is changed to an inner diameter of 70 mm, the length of the barrel is 3.2 meters, the screw speed is 90 revolutions per minute, the vacuum degree of the first exhaust port of the extruder is controlled at 70kPa, and the vacuum degree of the second exhaust port The vacuum degree is 90kPa, the vacuum degree of the third exhaust port is 103kPa; the temperature of the extruder is 215°C, and the residence time of the high-temperature polymerization reaction is 300 minutes.

[0052] The physical and chemical properties of the obtained product are shown in Table 1.

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Abstract

The invention provides a method for preparing a polyacrylate copolymer resin for optical conduction, which comprises the steps of: (1) continuously feeding a mixed monomer, an initiator and a chain transfer agent into a polymerization reaction kettle, and pressurizing at a temperature of between 78 and 220 DEG C for an initial polymerization reaction, wherein the reaction pressure is between 0.1 and 5.5MPa; and (2) then continuously feeding a product obtained in step (1) into a vented screw extruder with an internal temperature of between 200 and 230 DEG C for a high-temperature polymerization reaction, and then performing extrusion molding. The resin prepared by the method does not contain any residual solvent, and the light transmittance of the resin reaches over 93 percent; the numerical aperture of prepared plastic optical fiber is less than 0.35mm, and the transmission loss is less than 150Db / km under the excitation with the wavelength of 650nm when NA is equal to 0.1; and the resin can meet the requirements of optical devices on materials, and can be used for preparing high-grade optical products or devices such as liquid crystal light guide plates and the like.

Description

technical field [0001] The invention relates to a method for preparing polyacrylate copolymer resin, in particular to a preparation method for bulk polymerization. technical background [0002] At present, there are three main methods for industrially producing (meth)acrylate resins: suspension polymerization, solution polymerization and bulk polymerization. [0003] The suspension polymerization method uses water as the dispersion medium. After a certain proportion of dispersant and initiator are added to monomers such as methyl methacrylate (MMA), they are polymerized at about 80°C in the water system to obtain beads with a diameter of 600 microns. Precipitation of the polymer; after the precipitation is centrifuged and dried, it is granulated by an extruder, and finally polymethyl methacrylate (PMMA) molding compound is obtained. The sheet made of this PMMA molding compound is industrially Commonly known as plexiglass or acrylic plastic. The suspension method preparatio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F220/14C08F2/02C08F2/38G02B6/00
Inventor 李忠辉杨景辉栾英豪吴秋芳李福清马新胜
Owner 内蒙古金瑞明材料科技有限公司