CN111269360A - Methyl methacrylate polymerization graft modification process for waste rubber powder - Google Patents
Methyl methacrylate polymerization graft modification process for waste rubber powder Download PDFInfo
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- CN111269360A CN111269360A CN202010035280.5A CN202010035280A CN111269360A CN 111269360 A CN111269360 A CN 111269360A CN 202010035280 A CN202010035280 A CN 202010035280A CN 111269360 A CN111269360 A CN 111269360A
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- rubber powder
- modified asphalt
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- asphalt
- methyl methacrylate
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F279/00—Macromolecular compounds obtained by polymerising monomers on to polymers of monomers having two or more carbon-to-carbon double bonds as defined in group C08F36/00
- C08F279/02—Macromolecular compounds obtained by polymerising monomers on to polymers of monomers having two or more carbon-to-carbon double bonds as defined in group C08F36/00 on to polymers of conjugated dienes
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F253/00—Macromolecular compounds obtained by polymerising monomers on to natural rubbers or derivatives thereof
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L95/00—Compositions of bituminous materials, e.g. asphalt, tar, pitch
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- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
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Abstract
The invention relates to a methyl methacrylate polymerization graft modification process of waste rubber powder, which comprises the following specific steps: dispersing waste tire rubber powder in water, adding a certain amount of initiator and surface modifier, stirring at constant temperature of 50-90 ℃ for 1-12 hours, wherein the amount of the initiator accounts for 1.7-10% of the mass of the rubber powder, and the amount of the surface modifier accounts for 1-300% of the mass of the rubber powder. The grafted rubber powder is used as an asphalt modifier to prepare rubber powder modified asphalt through a wet modification process so as to regulate and control the performance of the modified asphalt. The method is simple to operate and low in cost, and can effectively regulate and control the main performances of the crumb rubber modified asphalt, such as penetration, ductility, softening point and the like.
Description
Technical Field
The invention relates to a methyl methacrylate polymerization graft modification process of waste rubber powder. In particular to a process technology for grafting polymethyl methacrylate to the surface of waste tire rubber powder by adopting a polymerization grafting method so as to regulate and control the performance of rubber powder modified asphalt.
Background
With the rapid development of the automobile industry and the rapid increase of the number of family cars in China, the waste tires generated in China each year are rapidly increased at a speed of 8% -10%, and the waste tires are the countries with the highest global waste tire yield. The estimated 2020, the production of waste tires in China will reach 2000 ten thousand tons. The components of the waste tires are complex and are not easy to degrade, and a large amount of the waste tires are accumulated, so that the waste tires occupy land resources and cause environmental pollution. However, rubber consumption in China is high, and rubber resources are deficient, so that improvement of comprehensive utilization rate of waste tire resources becomes a problem to be solved urgently.
The use of petroleum asphalt as road paving material has a long history, but with the increase of traffic volume, people put higher demands on road surface performance. Researches show that the asphalt is doped with waste tire rubber powder for modification, so that waste tires can be consumed in large scale, and the pressure of waste tire accumulation on the environment is reduced; the asphalt can improve the high-temperature stability, low-temperature crack resistance, ageing resistance and durability of asphalt, effectively reduce the noise of the road surface, reduce the reflection of light on the road surface, improve the antiskid effect of the road surface and arouse the general attention of people. Meanwhile, the waste tire rubber powder is used for replacing a high-cost SBS asphalt modifier, so that the paving cost is reduced, and therefore the rubber powder modified asphalt adopted for road construction has great development potential. But the application of the rubber powder modified asphalt is limited due to the factors of poor compatibility of the rubber powder and the asphalt and the like. The polymethyl methacrylate is grafted to the surface of the rubber powder of the waste tire, so that a surface mesh structure similar to SBS modified asphalt can be formed between the rubber powder and the asphalt, and the performance of the rubber powder modified asphalt is improved.
Disclosure of Invention
The invention provides a simple and convenient methyl methacrylate polymerization graft modification process of waste rubber powder, which is easy for industrial application.
The technical scheme adopted by the invention is as follows: dispersing waste tire rubber powder in water, adding a certain amount of initiator and surface modifier, stirring at constant temperature of 50-90 ℃ for 1-12 hours, wherein the amount of the initiator accounts for 1.7-10% of the mass of the rubber powder, and the amount of the surface modifier accounts for 1-300% of the mass of the rubber powder. After the reaction is finished, the waste tire rubber powder is subjected to suction filtration, washing, drying and weighing, and the mass grafting rate is measured to prepare the grafted rubber powder. The grafted rubber powder is used for preparing the rubber powder modified asphalt through a wet modification process, and main performance indexes of the rubber powder modified asphalt are detected.
The initiator is benzoyl peroxide, and the dosage of the initiator is 1.7-10% of that of styrene.
The surface modifier is methyl methacrylate, and the dosage of the surface modifier is 1-300% of the mass of the rubber powder.
The reaction temperature is 50-90 ℃.
The mass grafting ratio (mass of rubber powder after grafting-mass of rubber powder before grafting)/mass of rubber powder before grafting.
The particle size of the waste tire rubber powder is 40 meshes, and the rubber powder is obtained by crushing waste tires.
The reaction time is 1 to 12 hours.
The matrix asphalt is road asphalt.
The technical flow chart of the wet modification process of the waste tire rubber powder modified asphalt is shown in the figure.
The main performance indexes of the asphalt comprise 25 ℃ penetration degree, 5 ℃ ductility and softening point. The penetration at 25 ℃ is an index representing the degree and consistency of softness and hardness of asphalt and the resistance to shear failure, and reflects the relative viscosity of asphalt under certain conditions. The ductility at 5 ℃ represents the tensile strength of the asphalt, and the higher the ductility is, the better the low-temperature performance is; the softening point indicates the high-temperature stability, and the larger the softening point, the better the high-temperature stability.
The invention has the following advantages:
1. the surface modification of the waste tire rubber powder is realized by a polymerization grafting method. Methyl methacrylate is used as a grafting monomer, benzoyl peroxide is used as an initiator, and the polymethyl methacrylate is grafted to the surface of the waste tire rubber powder at a certain temperature. The grafted rubber powder is applied to modified asphalt, so that a surface mesh structure similar to SBS modified asphalt is formed between the rubber powder and the asphalt, and the rubber powder and the asphalt are stably compatible, thereby improving the performance and the stability of the modified asphalt.
2. Regulating and controlling the performance index of the rubber powder modified asphalt. The compatibility of the rubber powder and the asphalt is regulated and controlled by grafting polymethyl methacrylate chain segments with different amounts on the surface of the rubber powder, so that the regulation and control of the 25 ℃ penetration degree, the 5 ℃ ductility and the softening point of the modified asphalt are realized.
3. Easy operation and industrial application. The method has the advantages of simple treatment process, low cost, easy operation and realization of industrial application.
Drawings
FIG. 1 is a diagram of a wet modification process.
Detailed Description
The features of the present invention are further described below by way of examples, but the present invention is not limited to the following examples.
Example 1
100g of waste tire rubber powder, 5g of benzoyl peroxide and 300mL of methyl methacrylate were dispersed in 400mL of water and reacted at a constant temperature of 60 ℃ for 12 hours with stirring. And filtering and washing the reacted waste tire rubber powder, and drying at 80 ℃ until the mass is constant to prepare the modified rubber powder. The grafting rate of the rubber powder mass is measured to be 58%. The modified rubber powder and No. 70 matrix asphalt are prepared into rubber powder modified asphalt through a wet modification process, and the penetration at 25 ℃, the ductility at 5 ℃ and the softening point of the modified asphalt are measured. The needle penetration at 25 ℃ was 42(0.1mm), the extensibility at 5 ℃ was 7.6(cm), and the softening point was 67.4 (. degree. C.).
Example 2
100g of waste tire rubber powder, 5g of benzoyl peroxide and 300mL of methyl methacrylate were dispersed in 400mL of water and reacted at a constant temperature of 60 ℃ for 2 hours with stirring. And filtering and washing the reacted waste tire rubber powder, and drying at 80 ℃ until the mass is constant to prepare the modified rubber powder. The grafting rate of the rubber powder mass is measured to be 10%. The modified rubber powder and No. 70 matrix asphalt are prepared into rubber powder modified asphalt through a wet modification process, and the penetration at 25 ℃, the ductility at 5 ℃ and the softening point of the modified asphalt are determined. The needle penetration at 25 ℃ was 42(0.1mm), the extensibility at 5 ℃ was 7.8(cm), and the softening point was 67.2 (. degree. C.).
Example 3
100g of waste tire rubber powder, 5g of benzoyl peroxide and 300mL of methyl methacrylate were dispersed in 400mL of water and reacted at a constant temperature of 60 ℃ for 6 hours with stirring. And filtering and washing the reacted waste tire rubber powder, and drying at 80 ℃ until the mass is constant to prepare the modified rubber powder. The grafting rate of the rubber powder mass is measured to be 22 percent. The modified rubber powder and No. 70 matrix asphalt are prepared into rubber powder modified asphalt through a wet modification process, and the penetration at 25 ℃, the ductility at 5 ℃ and the softening point of the modified asphalt are measured. The needle penetration at 25 ℃ was 45(0.1mm), the extensibility at 5 ℃ was 8.6(cm), and the softening point was 66.2 (. degree. C.).
Example 4
100g of waste tire rubber powder, 5g of benzoyl peroxide and 100mL of methyl methacrylate were dispersed in 400mL of water and reacted at a constant temperature of 60 ℃ for 8 hours with stirring. And filtering and washing the reacted waste tire rubber powder, and drying at 80 ℃ until the mass is constant to prepare the modified rubber powder. The graft ratio of the rubber powder mass was measured to be 33%. The modified rubber powder and No. 70 matrix asphalt are prepared into rubber powder modified asphalt through a wet modification process, and the penetration at 25 ℃, the ductility at 5 ℃ and the softening point of the modified asphalt are measured. The needle penetration at 25 ℃ was 48(0.1mm), the extensibility at 5 ℃ was 8.8(cm), and the softening point was 64.8 (. degree. C.).
Example 5
100g of waste tire rubber powder, 5g of benzoyl peroxide and 200mL of methyl methacrylate were dispersed in 400mL of water and reacted at a constant temperature of 60 ℃ for 8 hours with stirring. And filtering and washing the reacted waste tire rubber powder, and drying at 80 ℃ until the mass is constant to prepare the modified rubber powder. The grafting rate of the rubber powder mass is measured to be 31 percent. The modified rubber powder and No. 70 matrix asphalt are prepared into rubber powder modified asphalt through a wet modification process, and the penetration at 25 ℃, the ductility at 5 ℃ and the softening point of the modified asphalt are measured. The needle penetration at 25 ℃ was 47(0.1mm), the extensibility at 5 ℃ was 8.7(cm), and the softening point was 65.5 (. degree. C.).
Claims (9)
1. A methyl methacrylate polymerization graft modification process of waste rubber powder comprises the following specific steps: dispersing waste tire rubber powder in water, adding a certain amount of initiator and surface modifier, stirring at constant temperature of 50-90 ℃ for 1-12 hours, wherein the amount of the initiator accounts for 1.7-10% of the mass of the rubber powder, and the amount of the surface modifier accounts for 1-300% of the mass of the rubber powder. And after the reaction is finished, measuring the mass grafting rate, preparing the modified asphalt, and measuring main performance indexes.
2. A grafted rubber powder prepared by the process of claim 1.
3. A preparation process of modified asphalt, the graft rubber powder of claim 2 is used for preparing the rubber powder modified asphalt by a wet modification process, and main performance indexes of the rubber powder modified asphalt are detected.
4. A modified asphalt prepared by the process of claim 3.
5. The process of claim 1, wherein the surface modifier is methyl methacrylate, and the amount of the surface modifier is 1-300% of the mass of the waste tire rubber powder.
6. The process for preparing modified asphalt according to claim 3, wherein the asphalt is road asphalt.
7. The process for polymerizing, grafting and modifying methyl methacrylate of waste rubber powder as claimed in claim 1, wherein the temperature is 50-90 ℃.
8. The process of claim 1, wherein the particle size of the waste tire rubber powder is 40 meshes, and the rubber powder source is waste tire grinding.
9. The process for polymerizing, grafting and modifying methyl methacrylate of waste rubber powder as claimed in claim 1, wherein the initiator is benzoyl peroxide, and the amount of the initiator is 1.7-10% of the mass of the rubber powder.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010035280.5A CN111269360A (en) | 2020-01-15 | 2020-01-15 | Methyl methacrylate polymerization graft modification process for waste rubber powder |
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| CN202010035280.5A CN111269360A (en) | 2020-01-15 | 2020-01-15 | Methyl methacrylate polymerization graft modification process for waste rubber powder |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111704757A (en) * | 2020-07-03 | 2020-09-25 | 苏州科技大学 | Preparation method and application of semi-interpenetrating network structure polybutyl acrylate/waste tire rubber powder |
| CN115322583A (en) * | 2022-09-26 | 2022-11-11 | 厦门新立基股份有限公司 | High-viscosity high-elasticity modified asphalt mixture and preparation method thereof |
-
2020
- 2020-01-15 CN CN202010035280.5A patent/CN111269360A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111704757A (en) * | 2020-07-03 | 2020-09-25 | 苏州科技大学 | Preparation method and application of semi-interpenetrating network structure polybutyl acrylate/waste tire rubber powder |
| CN111704757B (en) * | 2020-07-03 | 2022-04-15 | 苏州科技大学 | Preparation method and application of semi-interpenetrating network structure polybutyl acrylate/waste tire rubber powder |
| CN115322583A (en) * | 2022-09-26 | 2022-11-11 | 厦门新立基股份有限公司 | High-viscosity high-elasticity modified asphalt mixture and preparation method thereof |
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