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Preparation methods for diisocyanate-modified montmorillonite and modified asphalt by employing diisocyanate-modified montmorillonite

A technology of diisocyanate and modified asphalt, which is applied in the direction of building components, building insulation materials, buildings, etc., can solve the problems of agglomeration deposition, lower road performance, easy occurrence of modifiers, etc., and achieve good physical properties, low cost, Effect of good thermal storage stability

Inactive Publication Date: 2016-03-30
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Most of the traditional modifiers are based on physical modification, which is prone to agglomeration and deposition of modifiers during storage and use, which reduces road performance

Method used

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  • Preparation methods for diisocyanate-modified montmorillonite and modified asphalt by employing diisocyanate-modified montmorillonite
  • Preparation methods for diisocyanate-modified montmorillonite and modified asphalt by employing diisocyanate-modified montmorillonite
  • Preparation methods for diisocyanate-modified montmorillonite and modified asphalt by employing diisocyanate-modified montmorillonite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Mix 100g of N,N-dimethylformamide, 10g of Na-montmorillonite and 4g of isophorone diisocyanate, heat up to 90°C, stir and react at a rate of 500r / min for 6h, filter and wash with anhydrous toluene The filtered matter was 6 times, and the modified montmorillonite A was obtained after the filtered matter was dried.

[0030] Will contain 100g base asphalt (Maoming Petrochemical AH90 # ) stainless steel tank in a constant temperature oil bath, heated to 120°C to fully melt the base asphalt. After the base asphalt was completely melted, 10 g of modified montmorillonite A was added, and a high-speed shear emulsifier was used to shear and mix at a rate of 4000 r / min for 90 minutes to finally obtain a modified asphalt material.

Embodiment 2

[0032] Mix 100g of N,N-dimethylformamide, 10g of DK3 organic montmorillonite and 6g of 4,4'-dicyclohexylmethane diisocyanate, heat up to 85°C, stir and react at a rate of 600r / min for 6h, and filter The filtrate was washed 8 times with anhydrous toluene, and the modified montmorillonite B was obtained after the filtrate was dried.

[0033] Will contain 100g base asphalt (U.S. Shell 70 # ) stainless steel tank in a constant temperature oil bath, heated to 150°C to fully melt the base asphalt. After the base asphalt was completely melted, 8 g of modified montmorillonite B was added, and a high-speed shear emulsifier was used to shear and mix at a rate of 4000 r / min for 60 minutes to finally obtain a modified asphalt material.

Embodiment 3

[0035] Mix 100g of N,N-dimethylformamide, 15g of DK3 organic montmorillonite and 8g of 4,4'-diphenylmethane diisocyanate, heat up to 80°C, stir and react at 800r / min for 4h, filter The filtrate was washed 8 times with anhydrous toluene, and the modified montmorillonite C was obtained after the filtrate was dried.

[0036] Will contain 100g base asphalt (Maoming Petrochemical AH90 # ) stainless steel tank in a constant temperature oil bath, heated to 140°C to fully melt the base asphalt. After the base asphalt was completely melted, 6 g of modified montmorillonite C was added, and a high-speed shear emulsifier was used to shear and mix at a rate of 5000 r / min for 60 minutes to finally obtain a modified asphalt material.

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Abstract

The invention discloses preparation methods for diisocyanate-modified montmorillonite and modified asphalt by employing diisocyanate-modified montmorillonite. The modified montmorillonite is obtained by performing chemical reaction on a diisocyanate possessing isocyanate group (-NCO) and montmorillonite containing hydroxyl (-OH) for expanding the interlamellar spacing of montmorillonite and grafting montmorillonite with active -NCO. According to the preparation method for the modified asphalt material by employing the above modified montmorillonite. The modified montmorillonite is reacted with polar molecules in asphalt, the interlamellar spacing is further expanded and peeling happens, a peeled layer and asphalt form a chemical bond, and thus modified montmorillonite is stably dispersed in the asphalt system, and the modified asphalt material possesses superior high-temperature stability, heat storage stability and ageing resistance. Through the chemical reaction of modified montmorillonite and asphalt, the chemical composition of asphalt is improved, and the comprehensive performances are improved. The prepared modified asphalt material is applicable to fields such as laying of high-grade roads of bridges, highways and airports, and building surface water prevention and the like.

Description

technical field [0001] The invention relates to the field of preparation of modified montmorillonite and modified asphalt, in particular to a preparation method of diisocyanate modified montmorillonite and modified asphalt. Background technique [0002] Asphalt material has excellent road performance, rich resources and low price, so it is a necessity for laying high-grade roads in modern times. However, due to its high sensitivity to temperature (easy to become brittle at low temperature and easy to flow at high temperature), its elasticity and aging resistance are also poor, and with the increasing traffic volume, the performance requirements for asphalt are also increasing high. Therefore, people began to add various modifiers with excellent properties to the asphalt. [0003] Nano-phyllosilicate has a unique two-dimensional layered nanostructure and a huge specific surface area, and its incorporation into asphalt can improve the performance of asphalt at the nanoscale....

Claims

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Application Information

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IPC IPC(8): C08L95/00C08K9/04C08K3/34
CPCC08K9/04C08K3/346C08K2201/011C08K2201/014C08L2205/025
Inventor 肖新颜张登科
Owner SOUTH CHINA UNIV OF TECH
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