Temperature-controlled slow-release salt storage filler and preparation method thereof
By synthesizing temperature-responsive hydrogels on the surface of the salt storage filler, controlling the release rate of salt, solving the problems of salt precipitation accumulation and shortening service life in the prior art, and achieving intelligent regulation and environmental protection of salt release.
Patent Information
- Application Number
- CN202411567977.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-05
- Publication Date
- 2025-02-14
AI Technical Summary
Existing sustained release salt storage materials During high temperatures and rainfall, due to vehicle-induced water washing, a large amount of salt precipitation will accumulate on the road surface, resulting in environmental pollution and shortened service life.
Temperature-responsive hydrogels are prepared by crosslinking different proportions of acrylamide and synthesized on the surface of the salt storage filler to achieve the control of the release rate of salt. When the ambient temperature is lower than a certain temperature, the channels on the hydrogel surface open to promote salt release; when the temperature is higher than a certain temperature, the hydrogel shrinks and the channels close, hindering salt release.
It reduces the accumulation of salt precipitation on the road surface, extends the service life of salt storage fillers, and effectively avoids environmental pollution.
Smart Images
Figure CN119431894A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of snow and ice removal on asphalt pavement, and in particular to a temperature-controlled slow-release salt storage filler and a preparation method thereof. Background Art
[0002] Winter road icing poses a significant hazard to drivers. Slow-release salt-based materials are used in winter road deicing operations, which utilize porous carriers rather than traditional mineral powders to store salt. In rainy and snowy weather, precipitation will penetrate the road surface, causing the salt in the filler to ionize at the water-ice interface, thereby lowering the freezing point of the solution. This helps the solution penetrate further into the road surface. Through a combination of chemical and mechanical processes, the slow-release salt material is gradually released onto the road surface through salt precipitation channels, effectively melting ice and snow and preventing road icing.
[0003] Currently, slow-release salt storage materials usually use hydrophobic substances such as resins, oils, and silanes to encapsulate the salt. Although these materials partially reduce the release rate of the salt, the release of the salt is uniform throughout the life of the road. During high temperatures and rainfall, a large amount of salt precipitation can accumulate on the surface of slow-release deicing roads due to water washing caused by vehicles. This salt penetrates into the soil around the road slope with rainwater, causing environmental pollution damage. This environmental damage has not yet been effectively addressed. In view of this situation, it is imperative to study slow-release salt-based materials that can adjust the salt release rate according to temperature changes. Summary of the invention
[0004] In view of the problems existing in the prior art, the present invention provides a temperature-controlled slow-release salt storage filler and a preparation method thereof. A temperature-responsive hydrogel is prepared by cross-linking acrylamide in different proportions, and the hydrogel is synthesized on the surface of the salt storage filler to control the release rate of salt. When the ambient temperature is lower than a specific temperature, the channels on the surface of the hydrogel open to promote the release of salt; when the temperature is higher than a specific temperature, the hydrogel shrinks, the channels close, and the release of salt is hindered.
[0005] The present invention is achieved through the following technical solutions: A temperature-controlled slow-release salt storage filler, comprising, by weight, 20 to 30 parts of porous minerals, 30 to 60 parts of salt, 0.5 to 1 part of an anti-corrosion agent, 1 to 2 parts of silane oil, 2 to 5 parts of a temperature-responsive hydrogel, and 2 to 5 parts of a resin; The temperature-responsive hydrogel comprises 50-90 parts of isopropyl acrylamide, 10-50 parts of tert-butyl acrylamide, 1 part of a cross-linking agent and 1 part of an initiator, wherein the cross-linking agent is N,N'-methylenebisacrylamide.
[0006] Preferably, the initiator is ammonium persulfate.
[0007] Preferably, the resin is a phenolic resin.
[0008] Preferably, the anti-corrosion agent is triethanolamine hydrochloride and 1'3-bis(hydroxymethyl)urea.
[0009] Preferably, the silane oil is methyl silane oil.
[0010] A method for preparing a temperature-controlled slow-release salt storage filler comprises the following steps: Step 1: Mix 20-30 parts of porous mineral, 30-60 parts of salt and 0.5-1 part of corrosion inhibitor by weight, so that the salt particles fill the pores of the porous mineral to obtain a salt storage filler; Step 2: Mix 2 to 5 parts of the temperature-responsive hydrogel with the salt-storage filler obtained in step 1 to carry out a mixing reaction, so that the temperature-responsive hydrogel covers the salt-storage filler to obtain a hydrogel salt-storage filler, as follows: isopropyl acrylamide and tert-butyl acrylamide are mixed evenly in anhydrous ethanol, and a cross-linking agent and an initiator are added to obtain a mixed solution, and the salt storage filler obtained in step 1 is added to the mixed solution, and a constant temperature reaction is carried out in a nitrogen atmosphere, and isopropyl acrylamide and tert-butyl acrylamide undergo a cross-linking reaction to synthesize a temperature-controlled hydrogel and cover the surface of the salt storage filler, thereby obtaining a hydrogel salt storage filler; Step 3, adding the hydrogel salt storage filler obtained in step 2 and 2 to 5 parts of resin into anhydrous ethanol for reaction, so that the resin covers the surface of the temperature-responsive hydrogel to obtain the resin salt storage filler; Step 4: air-dry and clean the resin salt storage filler to obtain a temperature-controlled slow-release salt storage filler.
[0011] Preferably, the reaction time is 6-8 hours and the reaction temperature is 50-60°C.
[0012] Preferably, in step 4, air drying is carried out at a temperature above 60° C., and the air-dried product is then put into silane oil and washed with petroleum ether to obtain a temperature-controlled slow-release salt storage filler.
[0013] A kind of asphalt comprises the temperature-controlled slow-release salt storage filler.
[0014] A highway comprises the asphalt.
[0015] Compared with the prior art, the present invention has the following beneficial technical effects: The present invention provides a temperature-controlled slow-release salt storage filler, which is prepared by cross-linking acrylamide in different proportions to form a temperature-responsive hydrogel, wherein the molecular structure of the temperature-responsive hydrogel is composed of a certain proportion of hydrophilic acrylamide groups and hydrophobic isopropyl / tert-butyl groups. When the temperature is lower than the lower critical solution temperature, the acrylamide groups in the temperature-responsive hydrogel form strong hydrogen bonds with water molecules, causing the polymer to swell and hydrate. On the contrary, when the temperature exceeds the critical solution temperature, the hydrophilicity decreases, while the hydrophobicity of the isopropyl / tert-butyl group increases, causing the molecular structure to change from loose to compact. This causes the polymer to repel water and undergo a phase change, exhibiting temperature-responsive characteristics; exhibiting diametrically opposite physical properties at different temperatures. When the ambient temperature is lower than a specific temperature, the volume absorbs water and expands; when the ambient temperature is higher than a specific temperature, the volume loses water and shrinks; achieving differential changes in volume characteristics at different temperatures; synthesizing the temperature-responsive hydrogel on the surface of the salt storage filler to achieve control of the release rate of salt. When the ambient temperature is lower than the critical solution temperature, the volume absorbs water and expands, the channels on the surface of the hydrogel open, and the salt release rate accelerates; when the temperature is higher than the critical solution temperature, the volume of the hydrogel loses water and shrinks, the channels close, and the salt release rate slows down. In addition, a small amount of anti-corrosion agent and silane oil are added to prevent the precipitated salt from damaging road facilities and improve the hydrophobic effect of the salt storage filler. The temperature-controlled slow-release salt storage filler can reduce the accumulation of a large amount of salt precipitation on the surface of the slow-release deicing road due to water washing caused by vehicles during high temperatures and rainfall, and extend the service life of the salt storage filler.
[0016] The preparation method of the temperature-controlled slow-release salt storage filler provided by the present invention can use solid waste, silane oil, resin and other low-priced materials as porous minerals, so that the salt storage filler has good economic value, and the preparation process of the temperature-controlled slow-release salt storage filler is simple and the production cost is low. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.
[0018] Figure 1 This is a conductivity test diagram of a temperature-controlled slow-release salt storage filler of the present invention. DETAILED DESCRIPTION
[0019] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.
[0020] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for which protection is sought, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.
[0021] A temperature-controlled slow-release salt storage filler comprises, by weight, 20 to 30 parts of porous minerals, 30 to 60 parts of salt, 0.5 to 1 part of an anti-corrosion agent, 1 to 2 parts of silane oil, 2 to 5 parts of a temperature-responsive hydrogel, and 2 to 5 parts of a resin.
[0022] The particle size of porous minerals should be less than 0.15 mm and the porosity should be greater than 20% to allow sufficient space to store salt.
[0023] The salt content should mainly be chloride.
[0024] The corrosion inhibitor should mainly reduce chlorine corrosion, and triethanolamine hydrochloride and 1'3-bis(hydroxymethyl)urea are preferred.
[0025] Silane oil is mainly methyl silane oil.
[0026] The resin should be mainly high temperature resistant resin capable of withstanding temperatures above 200°C, preferably phenolic resin.
[0027] The temperature-responsive hydrogel comprises, by weight, 50-90 parts of isopropyl acrylamide, 10-50 parts of tert-butyl acrylamide, 1 part of a cross-linking agent and 1 part of an initiator.
[0028] If the ratio of isopropyl acrylamide to tert-butyl acrylamide is too high, the synthesized hydrogel will be unsuitable for the asphalt pavement environment, while if it is too low, the hydrogel will have no temperature change characteristics.
[0029] The temperature-controlled slow-release salt storage filler is prepared by cross-linking acrylamide in different proportions to prepare a temperature-responsive hydrogel, which is synthesized on the surface of the salt storage filler to control the release rate of salt. When the ambient temperature is lower than a certain temperature, the channels on the surface of the hydrogel open to promote salt release; when the temperature is higher than a certain temperature, the hydrogel shrinks and the channels close to hinder salt release. This solves the problem that a large amount of salt precipitation will accumulate on the surface of the slow-release deicing road due to water washing caused by vehicles during high temperatures and rainfall, while extending the service life of the salt storage filler.
[0030] In addition, the existing temperature-responsive hydrogel is only cross-linked with isopropyl acrylamide monomers, and the critical solution temperature is 32 ° C, which makes its relatively high critical solution temperature challenging for direct application in controlled-release salt storage materials. The present application includes 90-40 parts of isopropyl acrylamide and 10-60 parts of tert-butyl acrylamide by weight, which can be copolymerized to obtain a temperature-responsive hydrogel with a critical solution temperature of 31-16 ° C. By introducing tert-butyl acrylamide monomers and copolymerizing with isopropyl acrylamide, the critical solution temperature of the temperature-responsive hydrogel can be effectively reduced.
[0031] Correspondingly, the present application also provides a method for preparing a temperature-controlled slow-release salt storage filler, comprising the following steps: Step 1: Mix 20-30 parts of porous mineral, 30-60 parts of salt and 0.5-1 part of corrosion inhibitor by weight, so that the salt particles fill the pores of the porous mineral to obtain a salt storage filler; Step 2, after uniformly mixing 2 to 5 parts of the temperature-responsive hydrogel and the salt-storage filler obtained in step 1, performing a constant temperature reaction in a nitrogen atmosphere, so that the temperature-responsive hydrogel covers the salt-storage filler, and obtaining a hydrogel salt-storage filler; The specific method is as follows: In parts by mass, isopropyl acrylamide and tert-butyl acrylamide are mixed uniformly in anhydrous ethanol, and a cross-linking agent and an initiator are added to obtain a mixed solution, and the salt storage filler obtained in step 1 is added to the mixed solution, and the mixture is placed in a water bath and reacted for 6 hours in a nitrogen atmosphere at a reaction temperature of 55° C. The isopropyl acrylamide and tert-butyl acrylamide undergo a cross-linking reaction to synthesize a temperature-responsive hydrogel, and the temperature-responsive hydrogel is insoluble in anhydrous ethanol and thus precipitates and covers the surface of the salt storage filler, thereby obtaining a hydrogel salt storage filler; Step 3, adding the hydrogel salt storage filler obtained in step 2 and 2 to 5 parts of resin into anhydrous ethanol for reaction, so that the resin covers the surface of the temperature-responsive hydrogel to obtain the resin salt storage filler; Step 4: air-dry and clean the resin salt storage filler to obtain a controlled-release salt storage filler.
[0032] The solution and the pre-product in step 3 are placed in an asphalt rotary film aging box and heated to air-dry at 150°C. The obtained product is then put into silane oil and washed with petroleum ether and then filtered to obtain a temperature-controlled slow-release salt storage filler.
[0033] Example 1 A method for preparing a temperature-controlled slow-release salt storage filler comprises the following steps: Step 1: Mix 30 parts of porous mineral, 60 parts of salt and 1 part of corrosion inhibitor by weight, so that the salt particles fill the pores of the porous mineral to obtain a salt storage filler; Step 2: after uniformly mixing two portions of the temperature-responsive hydrogel and the salt-storage filler obtained in step 1, a constant temperature reaction is carried out in a nitrogen atmosphere so that the temperature-responsive hydrogel covers the salt-storage filler to obtain a hydrogel salt-storage filler; Each temperature-responsive hydrogel includes 90 parts of isopropyl acrylamide, 10 parts of tert-butyl acrylamide, 1 part of a cross-linking agent and 1 part of an initiator; the reaction time is 6 hours, and the reaction temperature is 55°C.
[0034] Step 3, filtering the product obtained in step 2, adding the obtained hydrogel salt storage filler and 5 parts of resin into anhydrous ethanol for reaction for 2 hours, the reaction temperature is higher than 40°C, so that the resin covers the surface of the temperature-responsive hydrogel to obtain the resin salt storage filler; Step 4: Place the solution and the pre-product in step 3 in an asphalt rotary film aging box, heat and air-dry, and then put the obtained product into silane oil, wash it with petroleum ether, and then filter it to obtain a controlled-release salt storage filler.
[0035] Example 2 A method for preparing a temperature-controlled slow-release salt storage filler comprises the following steps: Step 1: Mix 30 parts of porous mineral, 60 parts of salt and 1 part of corrosion inhibitor by weight, so that the salt particles fill the pores of the porous mineral to obtain a salt storage filler; Step 2: after uniformly mixing two portions of the temperature-responsive hydrogel and the salt-storage filler obtained in step 1, a constant temperature reaction is carried out in a nitrogen atmosphere so that the temperature-responsive hydrogel covers the salt-storage filler to obtain a hydrogel salt-storage filler; Each temperature-responsive hydrogel includes 80 parts of isopropyl acrylamide, 20 parts of tert-butyl acrylamide, 1 part of a cross-linking agent and 1 part of an initiator, the reaction time is 8 hours, and the reaction temperature is 55°C.
[0036] Step 3, filtering the product obtained in step 2, adding the obtained hydrogel salt storage filler and 5 parts of resin into anhydrous ethanol for reaction for 2 hours, so that the resin covers the surface of the temperature-responsive hydrogel, and obtaining the resin salt storage filler; Step 4: Place the solution and the pre-product in step 3 in an asphalt rotary film aging box, heat and air-dry, and then put the obtained product into silane oil, wash it with petroleum ether, and then filter it to obtain a controlled-release salt storage filler.
[0037] Example 3 A method for preparing a temperature-controlled slow-release salt storage filler comprises the following steps: Step 1: Mix 30 parts of porous mineral, 60 parts of salt and 1 part of corrosion inhibitor by weight, so that the salt particles fill the pores of the porous mineral to obtain a salt storage filler; Step 2: after uniformly mixing two portions of the temperature-responsive hydrogel and the salt-storage filler obtained in step 1, a constant temperature reaction is carried out in a nitrogen atmosphere so that the temperature-responsive hydrogel covers the salt-storage filler to obtain a hydrogel salt-storage filler; Each temperature-responsive hydrogel includes 70 parts of isopropyl acrylamide, 30 parts of tert-butyl acrylamide, 1 part of a cross-linking agent and 1 part of an initiator, the reaction time is 6 hours, and the reaction temperature is 55°C.
[0038] Step 3, filtering the product obtained in step 2, adding the obtained hydrogel salt storage filler and 5 parts of resin into anhydrous ethanol for reaction for 2 hours, so that the resin covers the surface of the temperature-responsive hydrogel, and obtaining the resin salt storage filler; Step 4: Place the solution and the pre-product in step 3 in an asphalt rotary film aging box, heat and air-dry, and then put the obtained product into silane oil, wash it with petroleum ether, and then filter it to obtain a controlled-release salt storage filler.
[0039] Example 4 A method for preparing a temperature-controlled slow-release salt storage filler comprises the following steps: Step 1: Mix 20 parts of porous mineral, 30 parts of salt and 0.5 parts of corrosion inhibitor by weight, so that the salt particles fill the pores of the porous mineral to obtain a salt storage filler; Step 2: after uniformly mixing 3 parts of the temperature-responsive hydrogel and the salt-storage filler obtained in step 1, a constant temperature reaction is carried out in a nitrogen atmosphere so that the temperature-responsive hydrogel covers the salt-storage filler to obtain a hydrogel salt-storage filler; Each temperature-responsive hydrogel includes 60 parts of isopropyl acrylamide, 40 parts of tert-butyl acrylamide, 1 part of a cross-linking agent and 1 part of an initiator, the reaction time is 7 hours, and the reaction temperature is 55°C.
[0040] Step 3, filtering the product obtained in step 2, adding the obtained hydrogel salt storage filler and 2 parts of resin into anhydrous ethanol for reaction for 2 hours, so that the resin covers the surface of the temperature-responsive hydrogel, and obtaining the resin salt storage filler; Step 4: Place the solution and the pre-product in step 3 in an asphalt rotary film aging box, heat and air-dry, and then put the obtained product into silane oil, wash it with petroleum ether, and then filter it to obtain a controlled-release salt storage filler.
[0041] Example 5 A method for preparing a temperature-controlled slow-release salt storage filler comprises the following steps: Step 1: Mix 26 parts of porous mineral, 45 parts of salt and 0.8 parts of corrosion inhibitor by weight, so that the salt particles fill the pores of the porous mineral to obtain a salt storage filler; Step 2: after uniformly mixing 4 parts of the temperature-responsive hydrogel and the salt-storage filler obtained in step 1, a constant temperature reaction is carried out in a nitrogen atmosphere so that the temperature-responsive hydrogel covers the salt-storage filler to obtain a hydrogel salt-storage filler; Each temperature-responsive hydrogel includes 50 parts of isopropyl acrylamide, 50 parts of tert-butyl acrylamide, 1 part of a cross-linking agent and 1 part of an initiator, the reaction time is 7 hours, and the reaction temperature is 55°C.
[0042] Step 3, filtering the product obtained in step 2, adding the obtained hydrogel salt storage filler and 4 parts of resin into anhydrous ethanol for reaction for 2 hours, so that the resin covers the surface of the temperature-responsive hydrogel, and obtaining the resin salt storage filler; Step 4: Place the solution and the pre-product in step 3 in an asphalt rotary film aging box, heat and air-dry, and then put the obtained product into silane oil, wash it with petroleum ether, and then filter it to obtain a controlled-release salt storage filler.
[0043] Correspondingly, the present application also provides an asphalt comprising the above-mentioned temperature-controlled slow-release salt storage filler.
[0044] Performance test of temperature-controlled slow-release salt storage filler The performance of controlling salt release rate of commercially available salt storage filler Ma Feilong and the temperature-controlled slow-release salt storage filler prepared in Examples 1 to 4 was tested. The salt release rate of the temperature-controlled slow-release salt storage filler prepared in Examples 1 to 4 was quantitatively analyzed using a conductivity meter (Leici, DDSJ-307A). The measurement was performed by filling a beaker with 250 ml of pure water and placing it in a water bath at an appropriate temperature. At the beginning of the test, 2.5 g of Ma Feilong and the temperature-controlled slow-release salt storage filler were evenly sprinkled on the water surface of the beaker, and the conductivity of the solution was measured at the corresponding time. The performance test results are shown in Figure 1 .
[0045] The greater the conductivity, the faster the salt release rate. Figure 1It can be seen from the test results that Ma Feilong does not have a temperature regulation function, so its conductivity changes linearly with the increase in temperature. The temperature-controlled slow-release salt storage filler of the present invention has a higher conductivity than Ma Feilong when the temperature is below a specific temperature; however, when the temperature is above a specific temperature, the conductivity is lower than Ma Feilong. This proves that the temperature-controlled slow-release salt storage filler of the present invention has the function of regulating the salt release rate at temperature. The specific temperature of the temperature-controlled slow-release salt storage filler is related to the ratio of isopropyl acrylamide and tert-butyl acrylamide.
[0046] The above contents are only for explaining the technical idea of the present invention and cannot be used to limit the protection scope of the present invention. Any changes made on the basis of the technical solution in accordance with the technical idea proposed by the present invention shall fall within the protection scope of the claims of the present invention.
Claims
1. A temperature-controlled slow-release salt storage filler, characterized in that: By weight, it includes 20 to 30 parts of porous minerals, 30 to 60 parts of salt, 0.5 to 1 part of anti-corrosion agent, 1 to 2 parts of silane oil, 2 to 5 parts of temperature-responsive hydrogel, and 2 to 5 parts of resin; The temperature-responsive hydrogel comprises 50-90 parts of isopropyl acrylamide, 10-50 parts of tert-butyl acrylamide, 1 part of a cross-linking agent and 1 part of an initiator, wherein the cross-linking agent is N,N'-methylenebisacrylamide.
2. A temperature-controlled slow-release salt storage filler according to claim 1, characterized in that: The initiator is ammonium persulfate.
3. The temperature-controlled slow-release salt storage filler according to claim 1, characterized in that: The resin is a phenolic resin.
4. The temperature-controlled slow-release salt storage filler according to claim 1, characterized in that: The anti-corrosion agents are triethanolamine hydrochloride and 1'3-bis(hydroxymethyl)urea.
5. The temperature-controlled slow-release salt storage filler according to claim 1, characterized in that: The silane oil is methyl silane oil.
6. A method for preparing the temperature-controlled slow-release salt storage filler according to any one of claims 1 to 5, characterized in that: The following steps are involved: Step 1: Mix 20-30 parts of porous mineral, 30-60 parts of salt and 0.5-1 part of corrosion inhibitor by weight, so that the salt particles fill the pores of the porous mineral to obtain a salt storage filler; Step 2: Mix 2 to 5 parts of the temperature-responsive hydrogel with the salt-storage filler obtained in step 1 to carry out a mixing reaction, so that the temperature-responsive hydrogel covers the salt-storage filler to obtain a hydrogel salt-storage filler, as follows: isopropyl acrylamide and tert-butyl acrylamide are mixed evenly in anhydrous ethanol, and a cross-linking agent and an initiator are added to obtain a mixed solution, and the salt storage filler obtained in step 1 is added to the mixed solution, and a constant temperature reaction is carried out in a nitrogen atmosphere, and isopropyl acrylamide and tert-butyl acrylamide undergo a cross-linking reaction to synthesize a temperature-controlled hydrogel and cover the surface of the salt storage filler, thereby obtaining a hydrogel salt storage filler; Step 3, adding the hydrogel salt storage filler obtained in step 2 and 2 to 5 parts of resin into anhydrous ethanol for reaction, so that the resin covers the surface of the temperature-responsive hydrogel to obtain the resin salt storage filler; Step 4: air-dry and clean the resin salt storage filler to obtain a temperature-controlled slow-release salt storage filler.
7. The method for preparing the temperature-controlled slow-release salt storage filler according to claim 6, characterized in that: The reaction time is 6-8 hours, and the reaction temperature is 50-60°C.
8. The method for preparing the temperature-controlled slow-release salt storage filler according to claim 6, characterized in that: In step 4, the product is air-dried at a temperature above 60° C., and the air-dried product is then put into silane oil and washed with petroleum ether to obtain a temperature-controlled slow-release salt storage filler.
9. Asphalt, characterized in that: It comprises the temperature-controlled slow-release salt storage filler as described in any one of claims 1 to 5.
10. A highway, characterized in that: Including the asphalt as claimed in claim 9.