Preparation method of dibenzoylmethane and application of dibenzoylmethane in molding processing of thermoplastic resin

A technology of dibenzoylmethane and methyl benzoate, applied in the field of preparation of beta-diketones, can solve the problems of high cost of raw materials, many by-products, low yield of dibenzoylmethane, etc., and achieves a condensation reaction cycle The effect of short, cost reduction, and less by-products

Inactive Publication Date: 2012-06-13
SHANDONG RUIFENG CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The preparation method of dibenzoylmethane in the prior art has high cost of main raw materials, long condensation reaction cycle, many by-products, low yield of dibenzoylmethane, solvent can not be fully recycled and has a negative effect on improving thermoplastic resin. Problems with poor photothermal stability

Method used

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  • Preparation method of dibenzoylmethane and application of dibenzoylmethane in molding processing of thermoplastic resin
  • Preparation method of dibenzoylmethane and application of dibenzoylmethane in molding processing of thermoplastic resin
  • Preparation method of dibenzoylmethane and application of dibenzoylmethane in molding processing of thermoplastic resin

Examples

Experimental program
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Embodiment 1

[0083] Prepare dibenzoylmethane of the present invention according to the following steps

[0084] ①. Synthesis of methyl benzoate

[0085] Using benzoic acid and methanol as raw materials, using sulfuric acid as a catalyst, it is prepared by esterification and distillation

[0086] a. Esterification process conditions

[0087] Benzoic acid / methanol molar ratio 1:4~1:6

[0088] The esterification reaction temperature is 70~80°C

[0089] Response time hours 4~5

[0090] Put 366g of benzoic acid and 384g of methanol into a three-necked flask, raise the temperature to 70°C-80°C, after the benzoic acid is completely dissolved, add concentrated sulfuric acid dropwise, and reflux for 4-5 hours. After the reaction is completed, distill and recover the residual methanol to obtain the crude product.

[0091] b. Esterification solution treatment

[0092] The esterification liquid from step a is washed with water, alkali washed, and then washed with water until the pH of the washin...

Embodiment 2～ Embodiment 5

[0122] According to the method and step of Example 1, the stearoylbenzoylmethane product of the present invention is prepared according to the formula of Table 1

[0123] Table 1

[0124] Raw material and yield Example 2 Example 3 Example 4 Example 5 methyl benzoate 47.6 54.4 61.2 58 Acetophenone 12 12 12 12 toluene 125.16 139.44 204.96 245 Xylene 53.64 59.76 87.84 105 Sodium methoxide 15 15 15 15 Condensation yield% 85 86 84 85 Crystallization yield% 95 95 96 94

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Abstract

The invention which relates to a preparation method of dibenzoylmethane and an application of dibenzoylmethane in the molding processing of a thermoplastic resin belongs to a preparation of compounds containing a CO group and only connected with a carbon atom or a hydrogen atom, and especially relates to a preparation of a beta-dione. The preparation method is characterized in that: dibenzoylmethane is prepared by carrying out a condensation reaction on methyl benzoate and acetophenone in an alkaline environment, methyl benzoate is prepared by esterifying raw materials of benzoic acid and methanol with sulfuric acid as a catalyst, and the preparation method comprises two steps of the synthesis of methyl benzoate and the preparation of dibenzoylmethane. The preparation method of dibenzoylmethane provided in the invention has the advantages of low raw material cost, short condensation reaction period, less byproduct, high dibenzoylmethane yield, complete solvent recovery, and excellent improvement of photo-thermal stabilities of the thermoplastic resin. The condensation yield is 85%, and the crystallization yield is 95%. The invention provides dibenzoylmethane prepared through the preparation method and an application method of dibenzoylmethane in the molding processing of the thermoplastic resin.

Description

technical field [0001] The invention relates to a preparation method of dibenzoylmethane and its application in thermoplastic resin molding processing. It belongs to the preparation of compounds containing CO groups and only connected to carbon or hydrogen atoms, especially the preparation of β-diketones. Background technique [0002] Dibenzoylmethane is an important light and heat stabilizer for thermoplastics with β-diketone structure. The product is non-toxic and tasteless, and is widely used in PVC plastics and ABS resins. At present, light stabilizers are mainly hindered amines, benzotriazoles and benzophenones. Efficient, multi-functional and non-toxic are the development directions of stabilizer products suitable for thermoplastic resin molding processing. Following the trend of environmental protection, the production of polluting and toxic stabilizers should be reduced. The production and promotion of β-diketone additives should be developed and increased. [000...

Claims

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Application Information

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IPC IPC(8): C07C49/784C07C45/68C08L27/06C08L55/02C08K5/07C08K13/02
Inventor 冯健呼建强张振国刘春信葛峰
Owner SHANDONG RUIFENG CHEM
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