Method for improving compatibility of stilbene-based biphenyl whitening agent and pp (polypropylene) plastic

A technology of stilbene and biphenyl, applied in the field of plastics, can solve the problems of poor compatibility, plastic whiteness and thermal stability effects, etc., to improve compatibility, enhance plastic whitening effect, and enhance yellowing point effect of concentration

Active Publication Date: 2019-01-15
HUNAN INSTITUTE OF ENGINEERING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the plastic PP is non-polar and easy to crystallize, and its compatibility with polar salt fluorescent whitening agents is poor, and the poor compatibility further affects the whiteness and thermal stability of the plastic.
These limit the application of polar salt fluorescent whitening agents in PP

Method used

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  • Method for improving compatibility of stilbene-based biphenyl whitening agent and pp (polypropylene) plastic
  • Method for improving compatibility of stilbene-based biphenyl whitening agent and pp (polypropylene) plastic
  • Method for improving compatibility of stilbene-based biphenyl whitening agent and pp (polypropylene) plastic

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] A method for improving the compatibility of distyryl biphenyls whitening agent and PP plastics, comprising the following steps:

[0055] (1) Preparation of 4,4'-distyryl biphenyl (a):

[0056]

[0057] Add 10mmol (2.512g) of 4,4'-dichloromethylbiphenyl and 20mmol (3.324g) of triethyl phosphite into a 250ml three-necked flask, reflux and stir at 155°C for 5h, and cool the reaction solution to room temperature. The yellow intermediate 4,4'-biphenylene-bis-methylphosphonic acid diethyl ester is obtained. Then use this intermediate, 20mmol benzaldehyde, and 30% methanol solution of sodium methoxide in 15ml of DMF at 55°C for 3h under reflux and stir to obtain a yellow-green crude product solution, cool to room temperature, filter with suction, and collect the solid on the filter paper with Boil 50ml of distilled water for 5 minutes, then suction filter while hot, and rinse with hot water and methanol successively. The filter cake obtained above was recrystallized with ...

Embodiment 2

[0064] (1) Preparation of 4,4'-distyryl biphenyl-2,2'-sodium disulfonate (b):

[0065]

[0066] In a 250ml three-necked flask, add 1.2814g (5mmol) 98% biphenyl benzyl dichloride, heat to 160°C to melt, then add 1.8651g (11mmol) 98% triethyl phosphite dropwise under stirring, After reacting for 5 hours, the intermediate was obtained. Triethyl phosphite was removed and cooled to 50°C for use. Under nitrogen protection conditions, add a mixture of 2.2708g (10mmol) 90% sodium 2-formylbenzenesulfonate and 10ml dimethyl sulfoxide while stirring in the intermediate synthesized above, and then slowly add the newly prepared 5ml of sodium methoxide-methanol solution. Keep stirring, after reacting at 50°C for 3 hours, add 21ml of acetone, and let stand for 3-5 hours. Suction filtration under reduced pressure to obtain a light yellow solid, which was washed with CH 3 CH 2 OH and H 2 O mixed solvent (CH 3 CH 2 OH:H 2 O=1:1) recrystallized three times and dried to obtain the prod...

Embodiment 3

[0075] (1) Preparation of 4,4'-distyryl biphenyl-2,2',4,4'-sodium tetrasulfonate (c):

[0076]

[0077] In a 250ml three-necked flask, add 1.2814g (5mmol) 98% biphenyl benzyl dichloride, heat to 160°C to melt, then add 1.8651g (11mmol) 98% triethyl phosphite dropwise under stirring, After reacting for 5 hours, the intermediate was obtained. Triethyl phosphite was removed and cooled to 50°C for use. Under the condition of nitrogen protection, a mixture of 3.1472g (10mmol) 98% benzaldehyde-2,4-sodium disulfonate and 10ml dimethyl sulfoxide was added to the intermediate synthesized above while stirring, and then slowly added dropwise Freshly prepared 5ml of sodium methoxide-methanol solution. Keep stirring, after reacting at 50°C for 3 hours, add 21ml of acetone, and let stand for 3-5 hours. Suction filtration under reduced pressure yielded a pale yellow solid, which was recrystallized three times with a mixed solvent of ethanol and water, and dried to obtain the product. T...

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Abstract

A method for improving compatibility of a stilbene-based biphenyl whitening agent and PP (polypropylene) plastic is as follows: 0.005-0.020 part of the stilbene-based biphenyl whitening agent is dissolved in a very small amount of solvent to obtain a whitening agent solution; the whitening agent solution is mixed with 1 part of stearic acid, 1 part of paraffin, 80-120 parts of PP (polypropylene) and 8-12 parts of PP-g-MAH to obtain a mixed material; the solvent of the PP plastic mixed material is evaporated; and thermoplastic molding is performed to obtain whitened PP plastic. Compared with the prior art, the method has the following characteristics: 1, the compatibility of a polar salt fluorescent whitening agent in the plastic PP is improved, the application limit of the polar salt whitening agent in plastics is broken through, the cost is low, the process is simple, and industrial application is facilitated; 2, the yellowing spot concentration of a fluorescent whitening agent in theplastic is improved, the whitening effect of the plastic is enhanced, and the thermal stability of the plastic is improved; and 3, a method is provided for application of the polar salt whitening agents in the plastic.

Description

technical field [0001] The invention relates to the technical field of plastics, in particular to a method for improving the compatibility between distyryl biphenyl whitening agents and PP plastics. Background technique [0002] With the vigorous development of the plastics industry, people's requirements for various performances of plastic products including appearance properties are constantly improving and the demand for special-purpose plastics. The use of fluorescent whitening agents to improve the appearance of plastic products has attracted more and more attention. PP has the characteristics of simple synthesis process, low relative density, good processability and mechanical properties, and has become a general-purpose plastic that has developed rapidly in recent years. Therefore, fluorescent whitening agents for whitening PP have received widespread attention. [0003] Fluorescent whitening agents can be divided into fat-soluble and water-soluble fluorescent whiten...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/12C08L51/06C08L91/06C08K5/09C08K5/42C08K5/01C08J3/205
CPCC08J3/2053C08L23/12C08L2201/08C08L51/06C08L91/06C08K5/09C08K5/42C08K5/01
Inventor 方正军邬峰易兵李喜田秦琪雯张海平
Owner HUNAN INSTITUTE OF ENGINEERING
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