JP2012229298A - Method for producing epoxy asphalt mixture in asphalt mixture producing plant - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve problems of blocking generated in an epoxy resin in an asphalt mixture, and the velocity of the curing time due to high reactivity of the epoxy resin and a hardener.SOLUTION: A method for producing an epoxy asphalt mixture in an asphalt mixture producing plant includes separately packaging a base agent in which 100 pts.wt. of an epoxy resin having an epoxy equivalent of 400 to 600 and a melting point of ≤70°C is mixed with 5 to 10 pts.wt. of an iron oxide pigment and 4 to 10 pts.wt. of a talc powder, and 24 to 36 pts.wt. of a hardener which is an aliphatic primary amine having an iodine value of 35 to 60, and charging the packaged base agent and the packaged hardener in an asphalt mixture producing machine in the asphalt mixture producing plant.

Description

  The present invention relates to a novel method for producing an epoxy asphalt composite material at an asphalt composite material manufacturing plant.

  When an asphalt composite material is produced by mixing an bisphenol A type epoxy resin and a curing agent at an asphalt composite material manufacturing plant, the epoxy resin and the curing agent react with each other to shorten the pot life, thereby hindering paving.

  For this reason, an asphalt mixture manufacturing plant makes an intermediate mixture in which an epoxy resin is added to asphalt, and a method of mixing a curing agent with this intermediate mixture at a paving site is employed. (See JP 55-145749)

  This method has many opportunities to directly touch the resin, such as weighing and stirring, has a problem in occupational safety and health of the material manufacturer, and requires skill of the material manufacturer.

  In addition, when the normal pot life of 3 hours is secured at the general composite material manufacturing temperature (160 ° C), the initial dynamic stability is slow to develop, and the time until traffic opening after paving the asphalt composite material is long. It was the cause of traffic jams.

  In order to improve these, a method for producing an asphalt mixture in which a bisphenol A type solid epoxy resin pulverized into flakes and a curing agent are mixed using an asphalt mixture production machine is proposed at an asphalt mixture production plant. It became so. (See JP2003-26929)

  However, there are some problems in quality control. Among the bisphenol A type solid epoxy resins pulverized into flakes, some resins with a high melting point do not melt due to the general mixture production temperature and mixer mixing time. In addition, some resins having a low melting point have a property of melting when the temperature reaches 20 ° C. or higher, so that there is a blocking phenomenon that they are fused to each other during storage and transportation and become a large mass. .

  If the solid epoxy resin is thrown into the composite material manufacturing machine in a large mass, it will not melt in the specified mixing time (1-2 minutes), so the mixing time will be doubled or tripled. At times, it is necessary to take measures such as fine regrinding with a hammer or the like, so that the productivity of the composite material is significantly reduced.

Japanese Unexamined Patent Publication No. 55-145201 Japanese Unexamined Patent Publication No. 55-145749 JP 2003-26929 A Japanese Patent Laid-Open No. 2003-64156 JP 2004-92373 A

  The present invention is a construction jam due to the fact that the normal pot life cannot be secured at the above-mentioned general composite material production temperature (160 ° C.), blocking phenomenon that occurs in bisphenol A type solid epoxy resin ground in flakes, bisphenol A The problem of the fast curing time due to the high reactivity between the epoxy resin and the curing agent is to be solved as described below.

  First, when manufacturing an asphalt composite material using asphalt as a binder at an asphalt composite material manufacturing plant, 100 parts by weight of a bisphenol A type solid epoxy resin pulverized into flakes having an epoxy equivalent of 400 to 600 and a melting point of 70 ° C. or less. On the other hand, 5 to 10 parts by weight of iron oxide pigment and 4 to 10 parts by weight of talc powder and 24 to 36 parts by weight of a curing agent that is an aliphatic primary amine having an iodine value of 35 to 60 are separately prepared. Provided is a method for producing an epoxy asphalt mixture, which is packed, and the packed main agent and curing agent are charged into an asphalt mixture production machine.

  In the above, the total amount of the main agent and the curing agent is preferably 10 to 30 parts by weight with respect to 100 parts by weight of the asphalt binder.

  In the above, the packaging is preferably made of a container that melts at 160 ° C. ± 20 ° C. or a ceramic container that can be pulverized when mixed in an asphalt composite material manufacturing machine.

  The appearance of the bisphenol A type solid epoxy resin having an epoxy equivalent of 400 to 600 and a melting point of 70 ° C. or less is white, translucent flakes like icy sugar (eg, vertical x horizontal x hot = 20 mm x 10 mm x 5 mm) Although it is pulverized and is most suitable for use, it has a property of melting when the temperature reaches 20 ° C. or higher, and therefore, a blocking phenomenon that becomes a large mass during storage and transportation occurs.

  In Claim 1 thru | or 3, the main ingredient which mixed 4-10 weight part of talc powder with respect to 100 weight part of bisphenol A type | mold solid epoxy resins grind | pulverized into flakes is the performance of the manufactured asphalt compound material. Without damaging, the blocking phenomenon can be prevented, and even if the blocking phenomenon occurs, it can be easily broken and easily broken, so that it can be easily dispersed in the asphalt composite material manufacturing machine.

  When talc powder is mixed with the bisphenol A type solid epoxy resin pulverized into flakes, the periphery of the (epoxy) solid epoxy resin is coated with talc powder. Since the talc powder is white and the solid (flaky) epoxy resin is also white, it cannot be determined whether or not the entire (flaky) solid epoxy resin is coated with the talc powder.

  In Claim 1 thru | or 3, the effect of coating by visual observation can be confirmed by adding 5-10 weight part of iron oxide pigments with respect to 100 weight part of bisphenol A type solid epoxy resins ground in flakes.

  In claim 1 to claim 3, since the pre-measured main agent and curing agent are separately packed and put into the composite material manufacturing machine, there is no opportunity to directly touch the resin such as metering and stirring, and the composite material There is no problem in the occupational safety and health of the manufacturer, and the skill of the compound manufacturer is not required.

  In Claim 2, the toughness and water tightness of asphalt compound material improve by making the total amount of a main ingredient and a hardening | curing agent into 10-30 weight part with respect to 100 weight part of asphalt binders.

  In claim 3, by using a container that melts at 160 ° C. ± 20 ° C., a pulverizable ceramic container, or a magnetic container for packing of the main agent and the curing agent, there is no opportunity to directly touch the resin such as weighing and stirring. , Epoxy asphalt composites can be easily manufactured without affecting the performance of epoxy asphalt composites. In the case of a porcelain container or a magnetic container, it becomes an aggregate of epoxy asphalt composite after being crushed in the composite material manufacturing machine.

As the talc powder used in the present invention, there are Chinese, Korean, Russian and the like, and as the iron oxide pigment, there are red iron oxide, black iron oxide and the like.
Although talc is produced in various parts of the world, domestic products are often used in high-grade Chinese, Korean, and Russian products because of the high level of impurities such as iron powder and poor whiteness.

  The main agent (epoxy equivalent 475, melting point 68 ° C.) composed of bisphenol A type solid epoxy resin pulverized into flakes and the curing agent composed of an aliphatic primary amine having an iodine value of 35 in a ratio of 10 to 3 weight ratio of the main agent Enclose in separate low density polyethylene containers (melting point 100-115 ° C) and mix asphalt (for example, straight asphalt, blown asphalt, semi-blown asphalt, modified asphalt, Trinidad asphalt) and aggregates with a compounding machine When kneading with a certain mixer, 7,14,21,28 parts by weight as the total amount of the main agent and the curing agent are added to 100 parts by weight of asphalt, and the initial dynamic stability (60 ° C) , 3 hour curing) and when fully cured (60 ° C, 6 days curing). The kneading was performed at a mixer room temperature of 160 ° C. with wet mixing for 90 seconds. The asphalt composite material thus produced could be paved after 3 hours.

  In the above embodiment, when iron oxide pigment and talc powder are blended in an amount exceeding 10 parts by weight with respect to 100 parts by weight of bisphenol A type solid epoxy resin obtained by pulverizing iron oxide pigment and talc powder, a lump of powder is formed. It was seen. Further, between 5 parts by weight and 10 parts by weight, the effect of preventing blocking was exhibited by coating the bisphenol A type solid epoxy resin pulverized uniformly in a flake form.

  In the said Example, when less than 24 weight part of hardening | curing agents are mix | blended with respect to the main ingredient 100, when the main ingredient which does not react is compounded more than 36 weight part, the unreacted hardening | curing agent is in a compound material. In any case, it was found that the initial stability and the dynamic stability at the time of complete curing were lowered, and the water resistance and durability were remarkably lowered.

  In the curing agent, when the iodine value of the aliphatic primary amine is less than 35, the reaction becomes fast and the pot life cannot be secured, and when it exceeds 60, the reaction becomes too slow and the asphalt compound paving time. It was found that could not be secured.

  In the above embodiment, the total amount of the main agent and the curing agent is 10 parts by weight or more with respect to 100 parts by weight of asphalt to be added, the initial dynamic stability is 3000 times / mm or more, and 15 parts by weight or more. It was also found that the dynamic stability upon complete curing can satisfy 10000 times / mm or more. Based on this result, asphalt mixture was paved with 100 parts by weight of asphalt and the total amount of the main agent and curing agent was 15 parts by weight, and traffic was opened after 3 hours, but the initial rutting did not occur. Good flatness could be secured.

Some variations are shown in the table below.

  It has been found that the asphalt mixture having a total weight of 5 parts by weight of the main agent and the curing agent with respect to 100 parts by weight of the asphalt binder has low initial stability and dynamic stability upon complete curing.

  Needless to say, the present invention is not limited to the above-described embodiments.

Claims (3)

  When manufacturing asphalt composites using asphalt as a binder at an asphalt composite manufacturing plant, 100 parts by weight of bisphenol A type solid epoxy resin crushed into flakes having an epoxy equivalent of 400 to 600 and a melting point of 70 ° C. or less The main agent in which 5 to 10 parts by weight of iron oxide pigment and 4 to 10 parts by weight of talc powder are mixed and 24 to 36 parts by weight of a curing agent which is an aliphatic primary amine having an iodine value of 35 to 60 are packed separately. A method for producing an epoxy asphalt mixture in an asphalt mixture production facility, wherein the packed main agent and curing agent are charged into an asphalt mixture production machine.   The method for producing an epoxy asphalt mixture in an asphalt mixture production plant according to claim 1, wherein the total amount of the main agent and the curing agent is 10 to 30 parts by weight with respect to 100 parts by weight of the asphalt binder.   The packaging is made of a container that melts at 160 ° C ± 20 ° C, or a ceramic or magnetic container that can be pulverized when put into an asphalt composite material manufacturing machine. The asphalt composite according to claim 1 or 2, A method for producing epoxy asphalt composites at a material manufacturing plant.