CN102153822A - Production method of polystyrene preventing processing color change - Google Patents
Production method of polystyrene preventing processing color change Download PDFInfo
- Publication number
- CN102153822A CN102153822A CN 201110115858 CN201110115858A CN102153822A CN 102153822 A CN102153822 A CN 102153822A CN 201110115858 CN201110115858 CN 201110115858 CN 201110115858 A CN201110115858 A CN 201110115858A CN 102153822 A CN102153822 A CN 102153822A
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- CN
- China
- Prior art keywords
- polystyrene
- color change
- production method
- phosphite antioxidant
- preventing processing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- Compositions Of Macromolecular Compounds (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
- Processes Of Treating Macromolecular Substances (AREA)
Abstract
The invention relates to a production method of polystyrene preventing processing color change. During the injection machining of polystyrene resin (in particular transparent polystyrene resin), certain substances with benzoquinonyl structure is easily generated under the shearing and heating actions of a screw, thus causing color change of injection molding products. In the invention, a certain proportion of phosphite ester antioxidant is added during the production process of polystyrene to solve the color stability of polystyrene products. The phosphite ester antioxidant is added in mixing or polymerization procedure with the proportion between 0.02% and 0.2%.
Description
Technical field
The present invention relates to a kind of polystyrene production method that prevents to process variable color.
Background technology
Polystyrene resin (especially transparent polystyrene resin) is in the process of injection moulding processing, and under the effect of the shearing of screw rod and heating, material becomes molten state gradually by solid state.If material is abundant inadequately at the injection cycle internal heating; the strong shearing of screw rod will certainly cause the degraded of poly styrene polymer so; the low molecule that produced of degraded is easy to the air institute oxidation that comprised in the melt; oxidation can produce the material of some band quinonyl structures usually, thereby causes the injection-molded item variable color.The injection-molded item metachromatism is a thing that makes manufacturer's headache, downstream client dislike; but; polystyrene how to produce anti-processing variable color is a technical barrier of manufacturer, and the method that solves this technical barrier also is not disclosed protection, report at present.
Summary of the invention
Technical scheme of the present invention
According to test, the research of p-poly-phenyl ethene processing variable color, find that causing the major cause of fabricated product variable color is the material that the course of processing has produced some band quinonyl structures, the material of these band quinonyl structures is yellow usually, so fabricated product just can variable color.In order to stop the goods variable color, just to stop the generation of quinonyl structural material from the source.By repetition test, find that phosphite antioxidant can play the effect that stops the quinonyl structural material to produce in the polystyrene injection moulding course of processing.If in the polystyrene production process, add phosphite antioxidant, phosphorous acid ester can stably be present in the polystyrene resin so, when the post-treatment of polystyrene resin, the resin solid particle becomes melt, phosphorous acid ester can be removed the hydroperoxide in the melt, make it to lose oxidation activity, thereby stoped the generation of displaing yellow quinonyl structural material effectively, so, the adding of phosphorous acid ester can effectively solve the discoloration problem of polystyrene resin in the post-treatment process, realizes the colour stability of polystyrene products post-treatment.Technical scheme of the present invention is exactly on the general formulation basis that polystyrene is produced, and adds a certain proportion of phosphite antioxidant in batching or polymerization process, allows phosphite antioxidant be evenly distributed in the polystyrene resin particle; Through facts have proved, phosphite antioxidant in polystyrene resin shared ratio between 0.02% to 0.2%, to stoping polystyrene processing color changeable effect the best.
Concrete embodiment
The difference that adds operation according to phosphite antioxidant roughly is divided into two kinds of embodiments:
(1) a certain amount of phosphite antioxidant is dissolved in the material-compound tank of polystyrene production, forms product through operations such as polymerization, devolatilization, granulation, packings then;
(2) a certain amount of phosphite antioxidant is dissolved in the vinylbenzene, again solution is directly joined polystyrene with certain flow rate and produce in the polymeric kettle, form product through operations such as devolatilization, granulation, packings then;
The above, it only is preferable embodiment of the present invention, be not that the present invention is done any pro forma restriction, any simple modification, equivalent variations and modification that every foundation technical spirit of the present invention is done above embodiment all still belong in the scope of technical solution of the present invention.
Claims (2)
1. the production method of an anti-processing variable color polystyrene is to add a certain proportion of phosphite antioxidant in the polystyrene production process, and phosphite antioxidant stops degraded, the oxidation stain of polystyrene in the post-treatment process.
2. the batching of producing at polystyrene, polymerization or other operations add phosphite antioxidant, all in technical scope of the present invention.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110115858 CN102153822A (en) | 2011-05-06 | 2011-05-06 | Production method of polystyrene preventing processing color change |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110115858 CN102153822A (en) | 2011-05-06 | 2011-05-06 | Production method of polystyrene preventing processing color change |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102153822A true CN102153822A (en) | 2011-08-17 |
Family
ID=44435518
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201110115858 Pending CN102153822A (en) | 2011-05-06 | 2011-05-06 | Production method of polystyrene preventing processing color change |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102153822A (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5726227A (en) * | 1995-11-30 | 1998-03-10 | Bayer Ag | Polymer moulding compositions stabilised with phosphorous acid esters |
-
2011
- 2011-05-06 CN CN 201110115858 patent/CN102153822A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5726227A (en) * | 1995-11-30 | 1998-03-10 | Bayer Ag | Polymer moulding compositions stabilised with phosphorous acid esters |
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| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20110817 |