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Preparation method of chitosan-based cationic gemini asphalt emulsifier

An asphalt emulsifier, cationic technology, used in building components, building insulation materials, buildings, etc., to achieve the effects of low CMC value, high surface activity, and low usage

Active Publication Date: 2018-09-11
CHAMBROAD CHEM IND RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are relatively few reports on the preparation of cationic gemini asphalt emulsifiers. Among them, CN107011189A reports that the preparation of gemini emulsifiers requires two steps of reaction, and the second step requires alcohol as a reaction solvent, and the raw materials are non-renewable petrochemical resources.

Method used

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  • Preparation method of chitosan-based cationic gemini asphalt emulsifier
  • Preparation method of chitosan-based cationic gemini asphalt emulsifier
  • Preparation method of chitosan-based cationic gemini asphalt emulsifier

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Emulsifier preparation: 16.1g (0.1mol) chitosan and 48.0g water were added to the reaction device, stirred and dissolved at 150rpm, and 8.71g (0.05mol) of ethylene glycol diglycidyl ether was added dropwise at 75°C, controlled The dropping rate is 1 drop / 2 seconds, and the reaction is refluxed for 5 hours after the dropping. After the reaction, the water is removed by centrifugation to obtain a flocculent solid substance, that is, a chitosan-based cationic gemini asphalt emulsifier, and the product yield is 96.2%.

[0020] Preparation of emulsifier aqueous solution: Dissolve 4.0 g of the emulsifier into 160 g of hot water at about 75° C., add an appropriate amount of concentrated hydrochloric acid to adjust the pH of the solution to 3-4, and obtain an emulsifier aqueous solution.

[0021] Asphalt emulsion preparation: Start the colloid mill, add the above-mentioned emulsifier aqueous solution at about 75°C to the colloid mill for saponification, then continuously add pet...

Embodiment 2

[0027] Emulsifier preparation: Add 16.1g (0.1mol) chitosan and 48.0g water into the reaction device, stir and dissolve at 150rpm, add 5.1g (0.025 mol), the control rate of addition is 1 drop / 3 seconds, the dropwise addition is completed and the reflux reaction is 6h. After the reaction is completed, the water is removed by centrifugation to obtain a flocculent solid substance, that is, to obtain a chitosan-based cationic gemini bituminous emulsifier, and the product yield is 93.7 %.

[0028] Preparation of emulsifier aqueous solution: preparation by referring to the method in Example 1.

[0029] Preparation of bitumen emulsion: prepared according to the method in Example 1.

Embodiment 3

[0036] Emulsifier preparation: 16.1g (0.1mol) chitosan and 48.0g water were added to the reaction device, stirred and dissolved at 150rpm, and 5.8g (0.05 mol), control the dropping speed to be 1 drop / 4 seconds, drop and complete the reflux reaction for 8h, and centrifuge to remove water after the reaction, to obtain flocculent solid matter, that is, to obtain the chitosan-based cationic gemini asphalt emulsifier, and the product yield is 93.5 %.

[0037] Preparation of emulsifier aqueous solution: preparation by referring to the method in Example 1.

[0038] Preparation of bitumen emulsion: prepared according to the method in Example 1.

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Abstract

The invention relates to a preparation method of a chitosan-based cationic gemini asphalt emulsifier. The emulsifier is prepared through reacting chitosan / O-carboxylated chitosan with ethylene glycoldiglycidyl ether. Rich biomass chitosan is used as a reaction raw material, and water is used as a reaction solvent, so the production cost of the emulsifier is reduced, and the green requirement of raw materials is met. The gemini asphalt emulsifier prepared in the invention has higher surface activity and a lower CMC value than traditional emulsifiers, and can emulsify various different types ofasphalts, a prepared asphalt emulsion is fine and uniform, and has a high storage stability, and various performance indicators of the asphalt emulsion reach the technical requirements of road emulsified asphalt in Technical Specification for Construction of Highway Asphalt Pavements, JTG F40-2004.

Description

technical field [0001] The invention belongs to the technical field of fine chemicals, and in particular relates to a preparation method of a chitosan-based cationic gemini asphalt emulsifier. Background technique [0002] Chitosan, also known as deacetylated chitin, is the only alkaline polysaccharide that occurs naturally. As a natural cationic polymer, chitosan has the advantages of low cost, biodegradability, good biocompatibility, non-toxicity, good bioaffinity, and easy chemical modification. It can be used as a hydrophilic group for Construction of asphalt emulsifiers. [0003] The preparation of emulsified asphalt, the storage stability of the emulsion and the performance of emulsified asphalt are largely determined by the structure and performance of the emulsifier. Cationic asphalt emulsifier has the advantages of strong emulsifying ability, good adhesion, strong adaptability to aggregate, good storage stability of asphalt emulsion and flexibility in the design o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/03C08L95/00C08L5/08C08B37/08
CPCC08B37/003C08J3/03C08J2395/00C08J2405/08
Inventor 裴立军马韵升樊其艳刘鹏张川李艳芳
Owner CHAMBROAD CHEM IND RES INST CO LTD
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