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Vegetable oil-based asphalt modifier, modified asphalt containing the modifier and preparation thereof

An asphalt modifier, vegetable oil-based technology, used in building structures, building components, building insulation materials, etc., can solve the problems of low requirements for modification equipment and single composition, and reduce the amount of additives and additives, and production costs. Low, easy-to-control process effects

Active Publication Date: 2019-04-23
RES INST OF HIGHWAY MINIST OF TRANSPORT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The modifier and modified asphalt have a single composition, the preparation method is simple and safe, and the requirements for modification equipment are low, so as to overcome the defects in the preparation of existing modified asphalt

Method used

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  • Vegetable oil-based asphalt modifier, modified asphalt containing the modifier and preparation thereof
  • Vegetable oil-based asphalt modifier, modified asphalt containing the modifier and preparation thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] The formula of vegetable oil-based polyurethane modifier is as follows:

[0042] Calculate the corresponding amount of liquefied diphenylmethane diisocyanate (MDI-100LL, produced by Yantai Wanhua Company, with a free NCO content of 28-30%) as the isocyanate index R (NCO / OH) is 1.8, and the corresponding amount of castor oil polyol (Sinopharm Group, AR, hydroxyl value 164mgKOH / g), account for 1% inhibitor orthophosphoric acid of liquefied MDI and castor oil polyol gross mass, account for the acetone solvent of 8% of total reactant volume: in order to regulate system viscosity, 8% of the total volume of solvent is added in step 1), and 10% and 82% are added in step 2) and step 3).

[0043] Dehydration of vegetable oil polyols: castor oil polyols were dehydrated under vacuum at 110° C. for 2 hours at 0.1 MPa, and cooled to room temperature under vacuum conditions.

[0044] The preparation method is:

[0045]1) Add 1% of the total mass of the polymerization inhibitor orth...

Embodiment 2

[0051] The formula of present embodiment modifying agent is as follows:

[0052] Calculate the corresponding amount of liquefied diphenylmethane diisocyanate (MDI-100LL, produced by Yantai Wanhua Company, with a free NCO content of 28% to 30% by mass) according to the isocyanate index R (NCO / OH) of 1.6, and the corresponding amount of castor oil Polyhydric alcohol (Sinopharm Group, AR, hydroxyl value 164mgKOH / g), account for 1% inhibitor orthophosphoric acid of castor oil polyol and liquefied MDI gross mass, 7% acetone solvent regulation system viscosity of whole reactant volume. In order to adjust the viscosity of the system, 5% of the total solvent volume is added in step 1), and 10% and 85% are added in step 2) and step 3).

[0053] The content of free NCO groups in the liquefied MDI is in excess of 60% relative to the content of active hydrogen contained in the hydroxyl groups in castor oil.

[0054] The dehydration steps for preparing vegetable oil-based polyurethane mod...

Embodiment 3

[0058] The formula of present embodiment modifying agent is as follows:

[0059] Calculate the corresponding amount of liquefied diphenylmethane diisocyanate (MDI-100LL, produced by Yantai Wanhua Company, with a free NCO content of 28-30%) as the isocyanate index R (NCO / OH) is 1.6, and the corresponding amount of castor oil polyol (Sinopharm Group, AR, hydroxyl value 164mgKOH / g), the 1% inhibitor orthophosphoric acid of total mass, the acetone solvent that accounts for 15.8% of total reactant volume is used for regulating system viscosity, wherein free NCO group in the liquefied MDI The amount of the substance of the group is in excess of 60% relative to the amount of the substance of the active hydrogen contained in the hydroxyl group in the castor oil.

[0060] The dehydration steps for preparing vegetable oil-based polyurethane modifier and vegetable oil polyol are the same as in Example 1.

[0061] Wherein, the isocyanate index in step 1) is R=1.6, and the heat preservati...

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Abstract

The invention discloses a plant-oil-based polyurethane modifier, modified asphalt and a preparation method of the plant-oil-based asphalt modifier. According to the plant-oil-based polyurethane modifier, dehydrated plant oil polyalcohol replaces petroleum-based polyalcohol to serve as a polyhydroxy component, the polyhydroxy component is added into a polyisocyanate component at the temperature of 25-35 DEG C, the index R of isocyanate ranges from 1.4 to 1.8, the temperature is raised to 40-50 DEG C after the polyhydroxy component is added, a heat preservation reaction is carried out for 1.5-3 h, a solvent with the volume accounting for 5-50% of the total volume of the reactant is added in the reaction process to adjust the system viscosity, and a series of plant-oil-based polyurethane prepolymers with different condensation degrees are prepared. The synthesis degree of the prepolymers is controlled, the prepolymers are added into matrix asphalt, and the modified asphalt containing plant-oil-based polyurethane is prepared. The asphalt modifier is low in viscosity and good in fluidity, and is easily dispersed in asphalt, the temperature needed by the shear process is low, time is short, the prepared plant-oil-based polyurethane modifier is environmentally friendly and renewable, and the obtained modifier asphalt is simple in ingredient and excellent in high and low temperature performance.

Description

technical field [0001] The invention belongs to the field of road engineering, and in particular relates to a high molecular polymer asphalt modifier, modified asphalt and a preparation method thereof. Background technique [0002] Polyurethane is a general term for macromolecular compounds containing repeated carbamate groups on the main chain. Polyurethane materials can be well dispersed in asphalt to form an elastic network structure, thereby modifying asphalt. Polyurethane modified asphalt has good low temperature performance, water resistance and chemical resistance. [0003] For example, the patent CN 102464892 A discloses a modifier for road asphalt, which uses a compound isocyanate material to form a polyurethane structure with the base asphalt through a chemical reaction to improve the performance of the base asphalt. The modifier can improve the softening point of base asphalt to about 70°C, and the ductility at 5°C to more than 20cm. The obtained modified asphalt...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G18/36C08L75/04C08L95/00
Inventor 曹东伟张海燕夏磊陈艳巨
Owner RES INST OF HIGHWAY MINIST OF TRANSPORT
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