Composite modified additive aiming at asphalt modification as well as synthesis process and application of composite modified additive

Abstract

The invention discloses a composite modified additive for asphalt modification as well as a synthesis process and application thereof, and relates to the technical field of asphalt modified additives, and the composite modified additive comprises naphthenic base, aryl, a rubber softener, special rubber and a high-temperature and low-temperature additive. The synthesis process comprises the following steps: adding naphthenic base and aryl into a closed reaction kettle, and stirring at a constant speed; adding a rubber softener for dispersion, and heating for synthesis reaction; adding a high-temperature and low-temperature additive for stirring and heating reaction synthesis; cooling to obtain a composite modified additive finished product. The composite modified additive provided by the invention can significantly improve the low-temperature crack resistance and high-temperature stability of asphalt and improve the overall performance of asphalt. When the composite modified additive is applied to the building waterproof material, the performance of the waterproof material can be remarkably improved, and the service life of the waterproof material can be remarkably prolonged. The production cost of an enterprise is reduced, the material quality is improved, the energy consumption is reduced, the safety performance is improved, the smoke during production is reduced, and the environmental protection property is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of asphalt modification additives, and in particular to a composite modification additive for asphalt modification, a synthesis process and an application thereof. Background Art

[0002] Asphalt is an important building material and is widely used in waterproofing, road paving, etc. However, traditional asphalt has some shortcomings in terms of performance, such as low-temperature brittleness and high-temperature fluidity, which limits its scope of use. In order to improve these properties, it is usually necessary to add modifiers to modify the asphalt. Specifically:

[0003] The high and low temperature performance of the asphalt currently used in building waterproof membranes is unstable, and a large amount of smoke is generated during the production of the product, which is not environmentally friendly.

[0004] The disadvantages of existing modified asphalt are: the production and modification process takes a long time, high energy consumption, high oxidation temperature, is not environmentally friendly, and the performance of the modified material is unstable.

[0005] Therefore, a composite modification additive for asphalt modification and its synthesis process and application have become issues that need to be urgently addressed. Summary of the invention

[0006] The purpose of the present invention is to provide a composite modified additive for asphalt modification and its synthesis process and application in order to improve the high and low temperature performance, bonding performance, safety and environmental protection performance of asphalt of building waterproof coiled materials.

[0007] To achieve the above purpose, the technical solution provided by the present invention is: a composite modification additive for asphalt modification, comprising raw materials in the following proportions: cycloalkyl: 25-32%, aromatic group: 8-13%, rubber softener: 8-12%, special rubber: 22-35%, high temperature and low temperature additive: 18-26%.

[0008] Preferably, the raw materials are in the following proportions: cycloalkyl: 30%, aromatic hydrocarbon: 10%, rubber softener: 10%, special rubber: 30%, high-temperature and low-temperature additive: 20%.

[0009] Furthermore, the rubber softener is styrene-butadiene rubber.

[0010] Furthermore, the high-temperature and low-temperature additives include high-molecular polyethylene and polypropylene, and the ratio of the high-molecular polyethylene to the polypropylene is 1:2.

[0011] The present invention also provides a synthesis process of a composite modification additive for asphalt modification, comprising the following steps:

[0012] Step 1, add cycloalkyl and aromatic groups into a closed reaction kettle, stir at a uniform speed, raise the temperature to 160°C, and mix and stir for 1 hour;

[0013] Step 2, adding a rubber softener for dispersion, heating to 170°C for staged synthesis reaction for 2 hours;

[0014] Step 3, adding high-temperature and low-temperature additives, stirring and heating to 210°C for overall reaction synthesis;

[0015] Step 4: After the overall reaction synthesis, the temperature is lowered to 60-70° C. to obtain a finished composite modified additive.

[0016] The present invention further provides the use of the composite modified additive in building waterproof materials.

[0017] The advantages of the present invention compared with the prior art are:

[0018] 1. The composite modified additive of the present invention can significantly improve the low-temperature crack resistance and high-temperature stability of asphalt, and improve the overall performance of asphalt.

[0019] 2. The present invention reduces production costs and improves production efficiency by optimizing raw material ratios and synthesis processes.

[0020] 3. Applying the composite modified additive of the present invention to building waterproof materials can significantly improve the performance and service life of the waterproof materials.

[0021] 4. The present invention shortens the production oxidation process time, reduces the temperature, increases material performance, and improves safety and environmental protection performance;

[0022] 5. The present invention reduces production costs of enterprises, increases material quality, reduces energy consumption, improves safety performance, reduces smoke during production, and improves environmental protection. DETAILED DESCRIPTION

[0023] The following is a further detailed description of a composite modification additive for asphalt modification according to the present invention, its synthesis process and application.

[0024] A ratio of a composite modification additive for asphalt modification:

[0025] Cycloalkyl: 25-32%;

[0026] Aromatic hydrocarbon group: 8-13%;

[0027] Rubber softener: 8-12%;

[0028] Special rubber: 22-35%;

[0029] High and low temperature additives: 18-26%.

[0030] The preferred ratio is: 30% cycloalkyl, 10% aromatic hydrocarbon, 10% rubber softener, 30% special rubber, and 20% high-temperature and low-temperature additives.

[0031] The rubber softener is styrene-butadiene rubber, which has good softening effect and dispersibility, and can significantly improve the flexibility and crack resistance of asphalt.

[0032] High-temperature and low-temperature additives include high-molecular polyethylene and polypropylene, with a ratio of 1:2. The synergistic effect of high-molecular polyethylene and polypropylene can significantly improve the high-temperature stability and low-temperature crack resistance of asphalt.

[0033] A synthesis process of a composite modification additive for asphalt modification:

[0034] Step 1: Add the cycloalkyl group and the aromatic group into a closed reaction kettle, stir at a constant speed, raise the temperature to 160°C, and mix and stir for 1 hour to fully mix the two.

[0035] Step 2: Add rubber softener for dispersion, raise the temperature to 170°C for staged synthesis reaction for 2 hours, so that the rubber softener can fully react with the cycloalkyl group and the aromatic group.

[0036] Step 3: Add high-temperature and low-temperature additives and stir, raise the temperature to 210°C for overall reaction synthesis, so that all raw materials can react fully to form a stable composite modified additive.

[0037] Step 4: After the overall reaction synthesis, cool to 60-70°C to obtain the finished composite modified additive.

[0038] Application of composite modification additives for asphalt modification:

[0039] Applying the composite modified additive of the present invention to building waterproof materials can significantly improve the low-temperature crack resistance, high-temperature stability and overall performance of the waterproof materials, extend the service life and reduce costs.

[0040] When preparing building waterproof materials, the proportions of each raw material can be as follows:

[0041] Asphalt 60%, composite modified additives 30%, filler 10%.

[0042] The building waterproof material produced according to the above ratio can meet the requirements of corresponding national standards.

[0043] The specific implementation process of the composite modification additive for asphalt modification and its synthesis process and application of the present invention is as follows:

[0044] Embodiment 1:

[0045] According to the ratio, 30% cycloalkyl, 10% aromatic hydrocarbon, 10% rubber softener (styrene-butadiene rubber), 30% special rubber, and 20% high-temperature and low-temperature additive (polymer polyethylene and polypropylene in a ratio of 1:2) were added into a closed reactor, and synthesized according to the above synthesis process to obtain a finished composite modified additive. The finished product was applied to building waterproof materials and performance tests were carried out. The results showed that the low-temperature crack resistance, high-temperature stability and overall performance of the waterproof material were significantly improved.

[0046] Embodiment 2:

[0047] Adjust the ratio, add 25% cycloalkyl, 13% aromatic, 12% rubber softener (styrene-butadiene rubber), 22% special rubber, 28% high-temperature and low-temperature additive (polymer polyethylene and polypropylene ratio of 1:2) into the closed reactor, and synthesize according to the above synthesis process to obtain the finished composite modified additive. The performance test was also carried out, and the results showed that the performance of the waterproof material was also improved.

[0048] Embodiment 3:

[0049] Adjust the ratio, add 32% cycloalkyl, 8% aromatic, 8% rubber softener (styrene-butadiene rubber), 35% special rubber, 18% high-temperature and low-temperature additive (polymer polyethylene and polypropylene ratio of 1:2) into the closed reactor, and synthesize according to the above synthesis process to obtain the finished composite modified additive. The performance test was also carried out, and the results showed that the performance of the waterproof material was also improved, but the performance improvement was different under different ratios.

[0050] The relevant test contents of the composite modified additives are as follows:

[0051] 1. Experimental Design

[0052] Experimental purpose: To compare the improvement effect of base asphalt and the composite modified additive of this application on base asphalt.

[0053] Experimental Materials:

[0054] Base asphalt

[0055] The composite modified additive of the present application.

[0056] Experimental methods:

[0057] The base asphalt and the composite modification additive are mixed in a certain proportion to prepare the modified asphalt sample.

[0058] The performance of base asphalt and modified asphalt samples was tested, including low-temperature tenderness, softening point, flash point, elongation and bonding strength with the substrate.

[0059] 2. Experimental Results

[0060]

[0061]

[0062] 3. Data Analysis

[0063] Low temperature stability: The low temperature temperature of asphalt modified with composite modification additives is significantly reduced, indicating that its low temperature stability is better than that of base asphalt.

[0064] Crack resistance: The ductility of asphalt modified with composite modified additives is significantly improved, indicating that its crack resistance is better than that of base asphalt.

[0065] From the above data, it can be seen that the softening point, flash point and bonding strength with the substrate of the asphalt modified by the composite modification additive are significantly higher than those of the base asphalt. It can be seen that the composite modification additive of the present application has greatly improved the performance of the base asphalt.

[0066] IV. Conclusion

[0067] In summary, the composite modified additive of the present application has significant advantages in improving the performance of asphalt.

[0068] The present invention and its implementation methods are described above. Such description is not restrictive. If a person skilled in the art is inspired by it and creatively designs structures and implementation methods similar to the technical solution without departing from the purpose of the present invention, they should all fall within the protection scope of the present invention.

Claims

1. A composite modification additive for asphalt modification, characterized in that: The invention comprises raw materials in the following proportions: cycloalkyl: 25-32%, aromatic hydrocarbon: 8-13%, rubber softener: 8-12%, special rubber: 22-35%, high-temperature and low-temperature additive: 18-26%.

2. The composite modification additive for asphalt modification according to claim 1, characterized in that: The invention comprises raw materials in the following proportions: cycloalkyl group: 30%, aromatic hydrocarbon group: 10%, rubber softener: 10%, special rubber: 30%, high-temperature and low-temperature additive: 20%.

3. The composite modification additive for asphalt modification according to claim 2, characterized in that: The rubber softener is styrene-butadiene rubber.

4. The composite modification additive for asphalt modification according to claim 3, characterized in that: The high-temperature and low-temperature additives include high-molecular polyethylene and polypropylene, and the ratio of the high-molecular polyethylene to the polypropylene is 1:

2.

5. A synthesis process of a composite modification additive for asphalt modification according to any one of claims 1 to 4, characterized in that: The following steps are involved: Step 1, add cycloalkyl and aromatic groups into a closed reaction kettle, stir at a uniform speed, raise the temperature to 160°C, and mix and stir for 1 hour; Step 2, adding a rubber softener for dispersion, heating to 170°C for staged synthesis reaction for 2 hours; Step 3, adding high-temperature and low-temperature additives, stirring and heating to 210°C for overall reaction synthesis; Step 4: After the overall reaction synthesis, the temperature is lowered to 60-70° C. to obtain a finished composite modified additive.

6. An application of a composite modification additive for asphalt modification, characterized in that: The composite modified additive according to any one of claims 1 to 4 is applied to building waterproof materials.

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