WO1993021387A1

WO1993021387A1 - Pavement, pavement material and method of manufacturing same

Info

Publication number: WO1993021387A1
Application number: PCT/JP1993/000282
Authority: WO
Inventors: Hideyuki Okuyama; Tetsuya Kojimoto; Masakazu Tanaka
Original assignee: Sumitomo Rubber Industries, Ltd.
Priority date: 1992-04-09
Filing date: 1993-03-05
Publication date: 1993-10-28
Also published as: DE4391631C2; DE4391631T1

Abstract

The present invention relates to a pavement, wherein a multitude of aggregates are joined together by a heated melt made of thermoplastic resin powder, a pavement material and a method of manufacturing the same. Since the thermoplastic resin powder has no limited pot life, and is not influenced by working conditions and weather conditions during the execution of work, the uniform strength can be displayed. Moreover, the thermoplastic resin powder is excellent in weather resistance, elasticity and flexibility. For this reason, the pavement according to the present invention is preferably used for the pavement of a playground, park, road and so forth. Furthermore, improvement after the execution of work is easily performed. Further, according to the manufacturing method of the present invention, the above-described pavement can be manufactured easily and efficiently.

Description

Specification

Pavement, pavement material and production method thereof

Technical field>

The present invention relates to a pavement used for athletic fields, parks, roads, and the like, in which a large number of aggregates are bonded by a resin, and a pavement material having a predetermined shape such as a block shape or a sheet shape that constitutes the pavement. It relates to a manufacturing method.

Conventionally, the above-mentioned pavement is prepared by applying a mixture obtained by mixing a hard aggregate such as natural stone or an elastic soft aggregate such as a rubber chip with a liquid curable resin to a construction site, In addition to being cured by the so-called on-site construction method, the mixture is poured into a mold at the factory, and the pavement material having a predetermined shape such as a block shape or a sheet shape obtained by curing the curable resin is used. A method of laying at the construction site and performing construction is also being implemented. However, the conventional pavement using a curable resin has the following various problems in any of the above cases.

1) The curability of the resin is limited from the start of the curing reaction until the reaction progresses and the fluidity is lost. In other words, the curing reaction of a curable resin starts immediately when a curing agent is added or when moisture or heat that promotes curing is added, so that long-term storage in a mixed state is impossible. '. In addition, since the liquid curable shelf sticks to the equipment and utensils used for its mixing and construction, it hardens, and frequent cleaning of these equipment is required. Furthermore, since the correction after curing is almost impossible, there is a problem that all operations must be completed before the curing reaction proceeds and the fluidity is lost.

2) The cured product of the curable resin needs to be cured for a long time after curing in order to obtain the required strength, and during that time, the finished pavement cannot be used. There is a risk. In the case of blocks and sheets, sufficient attention must be paid to the movement and transportation of products until curing is completed and the required strength is obtained, which raises a problem in terms of productivity.

3) When making blocks and sheets in factories, hot pressing is performed to accelerate the curing reaction of the curable resin, and the pressing time is the biggest factor that affects productivity. Is wearing. Hot pressing can greatly reduce the curing reaction time compared to curing at room temperature, but it still takes a relatively long time to complete the curing reaction, thus improving productivity. However, the effect is still insufficient. In addition, when hot pressing is performed, the viscosity of the curable resin decreases due to the heating at that time, which makes the curable resin easier to flow and accumulates at the lower part, so that the cured product of the curable resin is more in the lower part and less in the upper part. There is also a problem of uneven pavement. In addition, heat presses require large-scale equipment, which is problematic in terms of equipment costs.

4) The cured product of the curable resin does not flow again and has poor compatibility with other materials, so it is not possible to repair it or repair damaged parts. In addition, even if it can be repaired, there is a problem that the aggregate will be newly added, and only that part will be different color and stand out.

5) Since the curable resin contains a curing agent, a frame, an organic solvent, etc., it has a strong toxicity and a bad smell, and is harmful to worker's health.

6) The degree of curing reaction of curable resin varies depending on the conditions. Therefore, mixing, stirring, construction, «, etc., or climatic conditions such as temperature, humidity, etc. during construction, molding, curing, etc. Depending on the strength of the pavement can vary greatly;

7) The curable resin at present is a one-part moisture-curable urethane prepolymer made from, for example, toluene diisocyanate (TDI), diphenylmethane diisocyanate (MDI), etc. In many cases, this material is yellowed or brittle when exposed to light, has poor weather resistance, and can only provide a cured product with insufficient elasticity and flexibility.

8) It is difficult to stir uniformly the solid aggregate and the liquid curable resin, and there is a possibility that many or few aggregates may be formed in the pavement. In addition, since the mixture of the aggregate and the curable resin has a highly viscous muddy shape, it is difficult to automate the work of pouring the mold into a mold, especially when manufacturing a block sheet at a factory. There is also the problem that it must be done.

An object of the present invention is to provide a novel pavement and a pavement material that does not use a curable resin having various problems as described above, and to provide an efficient production method thereof. <Disclosure of the Invention> In the pavement of the present invention, a large number of aggregates are bonded by a heated melt of a thermoplastic resin powder mixed with the aggregates.

The method for producing a pavement according to the present invention further comprises the steps of: heating a mixture of the aggregate and a thermoplastic resin powder in an amount sufficient to bond the aggregate during heating and melting to melt the thermoplastic resin powder; The mixture is cooled to form the pavement.

Further, the pavement material of the present invention is a material in which a large number of aggregates are combined with a heated melt of a thermoplastic resin powder mixed with the aggregates and formed into a predetermined shape. Further, in the method for producing a pavement material of the present invention, a mold is filled with a mixture of an aggregate and a thermoplastic resin powder in an amount sufficient to bind the aggregate at the time of heating and melting. After melting the fat powder, the molten mixture is subjected to cold press molding to produce the pavement material.

According to the pavement, the pavement material and the production method thereof of the present invention, since the thermoplastic resin powder is used for bonding the aggregate, the pot life is not restricted as in the case of the curable resin, and the thermoplastic resin powder is not used. Long-term storage is possible in a state in which and aggregate are mixed. In addition, since this mixture does not stick to the device or the like unlike the curable resin and has no effect, the cleaning of the device and the like is hardly performed. Moreover, since the thermoplastic resin can be melted again only by heating, the workability is excellent, such as extension of work time and easy modification after construction. In addition, even if the bonding of the aggregates in the primary molding is incomplete, it can be re-bonded by reheating, and if any part is damaged, it can be repaired only by applying heat with a trowel or the like.

Furthermore, the thermoplastic resin is immediately solidified when cooled to a temperature below the melting point and exhibits a predetermined strength, so that curing and the like are not required, and there is an advantage that forcible cooling can shorten the manufacturing time. . Considering time and temperature, there is no unevenness of the binder above and below as in the case of the curable resin.

Thermoplastic resins are safe because they do not contain harmful components such as hardeners.They also solidify by a physical phase change from a liquid phase to a solid phase without a complicated curing reaction. It is possible to obtain pavements and pavement materials that always have a certain strength without being affected.

If you select the type of thermoplastic resin, it has higher elasticity than the cured product of curable resin. , Flexibility and weather resistance can be ensured, and the above-mentioned properties can be further improved by blending various additives such as a plasticizer and a stabilizer. The thermoplastic resin powder and the aggregate can be uniformly mixed by applying vibration without using a powerful mixer such as a rotary mixer or a universal mixer, and can be separated even if left in a mixed state Therefore, it is possible to obtain a pavement and a pavement material in which the aggregate is uniformly dispersed.

In addition, the pavement material of the present invention can be used for pavement simply by laying the pavement material manufactured at the factory in the field, and the advantage that the on-site construction can be further simplified.o

Further, in the method for manufacturing a pavement material of the present invention, the molten mixture of the aggregate and the thermoplastic resin powder is forcibly cooled by a cooling press, and thus is manufactured in comparison with the case where the molten mixture is naturally cooled. You can save time. In addition, since the time for the cooling press is considerably shorter than that for the above-described hot press for curing the thermosetting resin, the productivity can be significantly improved as compared with the conventional case.

The cooling press does not require a large-scale facility such as a hot press, and may have a simple configuration such as passing cooling water through a press die. Therefore, the equipment for pavement material production only requires a cooling press and a freshening stage for melting the thermoplastic resin powder, and has the advantage that it can be produced with simple equipment.

The mixture of the liquid curable resin and the aggregate is highly viscous and must be manually poured into the mold as described above.However, the mixture of the thermoplastic resin powder and the aggregate has no viscosity at all, and is granular. Easy to pour into mold. Therefore, the pouring into the mold can be automated, and the production of paved forest can be made more efficient. Brief description of drawings>

FIG. 1 (a) is an anti-large cross-sectional view showing a mixture of aggregate and thermoplastic resin powder used in the pavement and the method for producing a pavement material of the present invention, and FIG. It is an expanded sectional view which shows the structure of the pavement and pavement material of the present invention obtained by heating. FIG. 2 is a diagram illustrating a step of heating and melting a mixture in the steps of the method for producing a pavement material of the present invention.

Fig. 3 shows the cooling press step of the molten mixture among the steps of the pavement material manufacturing method of the present invention. FIG.

FIG. 4 is a plan view showing a dumbbell-shaped sample prepared for measuring tensile strength and elongation in the example of the pavement material of the present invention.

FIG. 5 is a graph showing the weather resistance of the pavement material of the present invention and the pavement material according to the ozone deterioration test evaluated by color difference.

BEST MODE FOR CARRYING OUT THE INVENTION>

The present invention will be described in more detail with reference to the accompanying drawings.

As shown in FIG. 1 (b), the pavement of the present invention is formed by joining a large number of aggregates R, R ... with a heated melt M of a thermoplastic resin.

As shown in Fig. 1 (a), the pavement is heated by heating a mixture of a large number of aggregates R, R ... and thermoplastic resin powders m, m ... Are produced by the production method of the present invention.

The heating of the mixture can be performed under pressure, if necessary. When the mixture is heated under pressure, not only can the pavement with low porosity and high density be obtained, but also the porosity and density of the pavement can be controlled by adjusting the pressing force. You can do it. Further, the pavement after heating may be forcibly cooled as described above, and in this case, the production time can be further reduced.

The pavement is applied to the site by spraying a mixture of aggregate and thermoplastic resin powder on the surface of the concrete pavement, asphalt pavement, etc., at the site, through a primer layer, etc., if necessary. A direct construction method such as a method of heating using a panel or a method of flattening a pre-heated mixture, followed by compaction, can be adopted, but it is manufactured in a factory or the like according to the method for manufacturing a pavement material of the present invention. An indirect construction method of laying the block-like or sheet-like pavement material on the site is more preferably employed. As a specific example of a method for manufacturing a pavement material, first, as shown in FIG. 2, a mixture 2 obtained by mixing an aggregate and a thermoplastic resin powder is filled in a primary mold 1.

Since both the aggregate and the thermoplastic resin powder are solid, even if a strong stirrer such as a universal stirrer is not used, both can be placed in a container such as a washbasin and vibrated by hand. It can be mixed well and the aggregate can be sufficiently dusted with thermoplastic resin powder When filling the primary form with the mixture, the form should be vibrated to ensure uniform charging.

Next, the primary mold 1 filled with the mixture 2 is placed in an oven 3 內 and heated to melt the thermoplastic resin powder.

The temperature and time of the fii heat are not particularly limited in the present invention. However, if the heating temperature is too low, the viscosity of the molten resin is so high that it may not reach the entire aggregate, and if the heating temperature is too high, the resin and the aggregate may be decomposed. Also, if the heating time is too short, the molten resin may not spread throughout the aggregate, and if the heating time is too long, the resin and the aggregate may be decomposed. Therefore, it is desirable to set the heating temperature and the heating time to an optimum range that does not cause the above-described problems according to the type of the thermoplastic resin to be used.

Next, as shown in FIG. 3, the primary mold 1 taken out of the oven 3 was immediately melted by heating and melting the thermoplastic resin powder and the molten mixture 2 ′ spread over the entire aggregate, and a pair of upper and lower secondary molds was used. Pavement material B is obtained by setting the frames 4 1 and 4 2 and cooling and pressing the molten mixture 2 ′ sufficiently.

To cool the secondary forms 4 1 and 4 2, besides using a direct cooling method such as passing cooling water inside, cool down the secondary forms 4 1 and 4 2 before use sufficiently beforehand. It is also possible to adopt an indirect cooling method, such as using a cooling press.

In order to further improve the productivity of the paving material, the primary form 1 is formed of a material having a small heat capacity and a large heat transfer, and the niches 4 1 and 4 2 are formed of a material that easily absorbs heat. Good to do.

As mentioned above, pavement villages manufactured by the construction method may be used in the form of blocks, directly or bonded to the surface of concrete block, etc., on concrete pavement, asphalt pavement, gravel, etc. at the construction site. It is laid. The sheet-like pavement material is adhered to the surface of concrete pavement, asphalt pavement, or the like via a primer layer or the like as necessary.

As the aggregate, various types of conventionally known soft and hard aggregates are used. Examples of the soft aggregate include rubber chips, urethane chips, waste tire rubber chips, and colloidal particles having a particle size of about 0.05 to 30 quakes and pulverized into granules or strings (hidden shapes). Various types of elastic soft aggregates such as wood chips and soft waste plastic chips can be used. The hardness of the soft aggregate is not particularly limited, but is preferably 70 or less in JISA hardness in order to secure the elasticity of the pavement.

— Hard aggregates include, for example, natural stone, wood chips, knollemi chips, bamboo scraps, shells, ceramic particles, hard plastic particles, hard plastic crushed materials, etc. Zero or more hard particles are preferably used. Hard aggregates, such as natural stones, that are difficult to mix with the thermoplastic resin powder are preferably used after being surface-treated with, for example, an epoxy resin, but can be used as they are.

As the thermoplastic resin powder, a conventionally known thermoplastic resin powder, particularly, a thermoplastic resin powder having a melting point of 60 to 200 and an average particle diameter of 10 mesh or less is used. . In particular, soft materials having excellent weather resistance and water resistance are preferable. If the melting point of the thermoplastic resin powder is less than 60 ° C, the thermoplastic resin in the completed pavement may be re-melted by the heat of direct sunlight, especially in summer, and the pavement may be deformed. If the temperature exceeds 200 ° C, melting of the thermoplastic resin powder during construction becomes difficult, and aggregate heat, especially aggregates with rubber-like elasticity or hard bone made of hard plastic, is generated by the heat of melting. The material may be deteriorated.

It is preferable that the thermoplastic resin has a vicat softening point of 40 ° C. or higher because it prevents the thermoplastic resin from being re-melted by direct sunlight or the like to deform the pavement.

The thermoplastic resin powder preferably has an average particle size of 10 mesh or less for the following reasons. .

If the average particle size of the thermoplastic resin powder exceeds 10 mesh, if the aggregate is not mixed in a state of being heated and melted to a certain extent, the joint between the aggregates is poor and the aggregate becomes very brittle. For this reason, it is necessary to preheat and mix before molding or construction with large equipment such as a heating and mixing device.

On the other hand, if the average particle size of the thermoplastic resin powder is 10 mesh or less, the pavement with good strength and good connection between the aggregates can be obtained without preheating and mixing. . Therefore, there is no need for a large machine such as a heating and mixing device, and the aggregate can be easily mixed, which is advantageous in manufacturing. In addition, if facilities for preheating and mixing such as a heating and mixing device can be used in a factory or the like, there is no limitation on the average particle size of the thermoplastic resin powder.

Preferred thermoplastic resin powders include poly (meth) acrylates such as ethyl methyl acrylate (EMA), polyethylene (PE), polypropylene (PP), polyvinyl chloride (PVA), polyurethane, and ethylene monoacetic acid. Powders of soft thermoplastic resins such as vinyl copolymer (EVA) and ethylene-ethyl acrylate copolymer (E EA), butadiene rubber, ethylene-propylene rubber (EPM), ethylene copolymer Thermoplastic rubber powders such as propylene-one rubber (E PDM), styrene butagen rubber (SBR :), nitrile rubber (NBR), olefin rubber, and polyester rubber can also be used.

The blending amount of the thermoplastic resin powder is not particularly limited, and is preferably in the range of 3 to 50% by volume based on the total amount of the aggregate.

If the blending ratio of the thermoplastic resin powder is less than 3% by weight, the pavement strength may be insufficient. Conversely, if the blending ratio exceeds 50% by volume, the surface of the pavement becomes a layer of thermoplastic resin. In addition, the function of the aggregate to prevent slippage and shock absorption is reduced, and the appearance of the pavement may be impaired.

In the present invention, a pavement having water permeability can be formed by adjusting the blending ratio of the thermoplastic resin powder to a smaller value within the above range. In this case, the porosity of the formed pavement is preferably 10 to 40%. If the porosity of the pavement is less than 10%, the water permeability may be insufficient. Conversely, if the porosity exceeds 40%, the strength of the pavement decreases.

It is desirable to select a combination of the aggregate and the thermoplastic resin powder in accordance with the characteristics of the pavement to be produced, etc., and in particular, the chemical compatibility of the two. For example, if ethylene-propylene-gen rubber chips are used as the aggregate, they have the same methylene main chain as the thermoplastic resin powder, and easily adhere to the surface of the aggregate during mixing, and are mixed uniformly. Ethylene-vinyl acetate copolymer, soft polyethylene, and butadiene rubber, which are easy to use and have high crane strength after heating and melting, are used in the pulp.

Since the pavement of the present invention uses the thermoplastic resin powder for bonding the aggregate, Eliminates problems when using resin, has uniform strength without fluctuations due to working conditions and climatic conditions during construction, and has excellent weather resistance, elasticity, flexibility, and modification after construction, etc. Since it has excellent characteristics that it is easy, it can be suitably used for pavement such as playgrounds, parks, and roads.

Further, according to the production method of the present invention, it is possible to more easily produce a pavement having the above-mentioned excellent characteristics.

Further, since the pavement material of the present invention can be paved simply by laying a large amount of pavement material on site at the site, the on-site operation can be further simplified.

Furthermore, according to the pavement material manufacturing method of the present invention, the molten mixture of the aggregate and the thermoplastic resin powder is forcibly cooled by the cooling press, so that the productivity can be significantly improved as compared with the conventional method.

Examples>

Hereinafter, the present invention will be described in detail with reference to Examples and Comparative Examples, but the present invention is not limited to only these Examples.

Example 1

Ethylene-propylene-gen rubber chips (average particle size: 2.5 g, Sumitomo Rubber Industries, Inc. product name “Grip Coat GO Chip”): 300 g, ethylene vinyl acetate acetate copolymer powder (average particle size) 40 mesh, a vinyl acetate content of 25% by weight, and a melt flow rate of 3 g / 1 O min) were introduced into the pad, and the pad was shaken by hand to mix for 1 minute. The resulting mixture is a homogeneous mixture of ethylene-propylene-gengom chips and ethylene-vinyl acetate copolymer powder. , Filled into a mold with a depth of 10 thighs, heated for 15 minutes in an oven heated at 200, then removed from the mold, allowed to cool, and paved in sheet form Wood was obtained. The porosity of this pavement material was determined from the volume, the specific gravity of the raw material ethylene-propylene-gen rubber (d = 1.3) and the specific gravity of the ethylene-vinyl acetate copolymer (d = 0.9). However, it was 32%.

Comparative Example 1 Using a universal stirrer, 260 g of the above ethylene-propylene-gen rubber chips and MD I one-component moisture-curable urethane resin (Sumito Rubber Co., Ltd., product name "Grip Coat C-1 928 J") S7g The mixture was stirred and mixed to obtain a mixture.

Next, the obtained mixture is placed in a 190 mm tall, 190 thigh horizontal, 10 thigh deep formwork by pressing it sufficiently using a trowel, and the whole form is placed in an oven heated at 150 for 20 minutes. After heating and pressurization, demolding and cooling were performed to obtain a sheet-like pavement material. O The rate of this pavement material was determined by its volume and specific gravity (d) of the raw material ethylene-propylene-gen rubber (d = I. 3) and the specific gravity (d = 0, 9) of the cured product of the curable resin were 33%.

The sheet-like pavement material obtained in Example 1 and Comparative Example 1 was punched into a dumbbell shape, and was subjected to a method similar to the bow filling test described in JIS K6301 for 24 hours immediately after molding and up to 72 hours after molding. each was measured tensile strength T _B CkgfZcm ^2] and elongation E _B (%).

That is, the total length a = 120 thighs, the width b = 25 thighs, the width of the central parallel part c = 10 mm shown in Fig. 4. The length L of the parallel part and the distance L between the marked lines. = A dumbbell-shaped sample of 40 thighs was attached to the test specimen grip of the tensile tester, and when pulled at a pulling speed of 500 ± 25 Zmin, the maximum load until cutting F _B Ckgf {N}] Was read, and the tensile strength T _B Ckgf cm ² ] was calculated from the numerical value and the cross-sectional area A (cm ² ) of the test piece by the following equation.

The length (mm) between the marked lines at the time of the above cutting was measured, and the numerical value and the distance L between the marked lines before the tensile test were measured. = From 40 thigh was calculated elongation E _B (%) by the following equation. ,

Table 1 shows the results. table 1

From the results in Table 1, in Comparative Example 1, the tensile strength is at markedly properly lower stage immediately after molding, rose finally to 7. 0 kf / cm ² by curing for 4 beta time, its been more high I knew it wouldn't. The elongation rate remained at a low level from immediately after molding to 72 hours later. From this, it was found that Comparative Example 1 using a curable resin requires a long curing time after molding and cannot obtain a pavement having excellent elasticity and the like.

On the other hand, in Example 1, it was found that both the tensile strength and the elongation showed high values immediately after molding, and that the values of the tensile strength did not change with the passage of time thereafter.

Examples 2 to 4

An aggregate having the composition shown in Table 2 below and EVA powder (Flosen MK210, trade name, manufactured by Sumitomo Seika Co., Ltd.) as a thermoplastic resin powder are charged into a mixing vessel, and the vessel is vibrated. To produce a homogeneous mixture. The soft aggregate in Table 2 is EP DM rubber chip (Grip coat GO chip manufactured by Sumitomo Rubber Industries, Ltd.), and the hard bone is natural stone (trade name, manufactured by Sumitomo Rubber Industries, Ltd.). Bean jam) was used. However, the mixing ratio of the aggregate and the EVA powder was calculated as volume: aggregate: EVA = 5: 1. Table 2

Next, as shown in FIG. 2, the above mixture 2 is filled into a primary formwork 1 of 130 bandages, 130 thighs, and a depth of 100, and the mold 1 is vibrated to uniformly mix After that, 180 per formwork. It was placed in oven 3 heated to C and heated for 15 minutes.

Next, the above-mentioned primary form 1 is taken out of the oven 3 together with the molten mixture 2 ′, and as shown in FIG. 3, a pair of well-cooled secondary forms 41 and 42 (50 kg of the upper secondary form 41). Then, the sheet was cooled and pressed under the condition of a press pressure of 0.3 kgZcm ² for 10 minutes to obtain a sheet-like paving material B.

The porosity of the obtained pavement material is determined by its volume, JtE (d = 1.3) of ethylene-propylene-digen rubber as raw material, specific gravity of ethylene monoacetate copolymer (d = 0.9) and natural The specific gravity of the stone (d = 2.3) was found to be 25% in Examples 2 to 4 in all cases.

Comparative Example 2

After mixing 822 g of EP DM rubber chip and 87 g of MD I one-component moisture-curable resin with a universal stirrer, the mixture is placed in a 300 thigh, 300 thigh, 10 mm deep mold. And press it sufficiently using a trowel to make it ffii. Then, set the formwork in a hot press machine, and press hot for 20 minutes under the conditions of 1.OkgZcm ² and 150 ° C, Paving material was obtained. The porosity of this pavement material is determined from its volume, the specific gravity of the raw materials ethylene-propylene-gen rubber (d = l.3) and the specific gravity of the cured product of fats and oils (d = 0.9). It was 25%.

The following tests were performed on the sheet-like pavement material obtained in the above Examples and Comparative Examples. The properties were evaluated.

Tensile strength test

The sheet-shaped pavement material obtained in the above Examples and Comparative Examples was punched out into a dumbbell shape, and immediately after molding and up to 72 hours after molding, according to the above-described tensile test described in JISK 6301. The tensile strength [kg f Zcm ² ] and the elongation (%) were measured every 24 hours.

Workability evaluation

Workers who were actually involved in the manufacturing work evaluated the ease of mixing work and the ease of preparing the mold as parameters for ease of paving material manufacturing work in the following five stages. .

Ease: 0,

Slightly easy: 4 points

Average: 3 points

Somewhat difficult: 2 points

Difficulty: 1 point

The following responses were obtained when the workers were asked for their impressions of both operations.

Ease of Stirring: In Comparative Example 2, it is difficult to stir uniformly because two different components, a granular EPDM rubber chip and a liquid MDI one-component moisture-curable urethane resin, are mixed. In Examples 2 to 4, the same aggregates of granular aggregate and EVA powder as EVA powder are mixed, so that uniform stirring is easy.

Ease of preparation: The mixture of Comparative Example 2 shows a muddy state and is difficult to be prepared in a mold. The mixtures of Examples 2 to 4 are smooth and powdery and easy to ttii.

Work time measurement

In each step of the pavement material manufacturing work, the time of each of the following works was measured.

Stirring time: In Examples 2 to 4, the aggregate and EVA powder were put into a mixing container, and the time required to form a uniform mixture when the container was vibrated was measured. For Comparative Example 2, The time required to form a uniform muddy mixture when the EP DM rubber chip and the MDI one-component moisture-curable urethane resin were stirred with a universal stirrer was measured.

Charging time: charging the same amount of mixture in the same charging container into the mold The time to end was measured.

Pressing time: Example 24 measured the time required to cool the molten mixture to room temperature, and Comparative Example 2 measured the time required for the MDI one-part moisture-curable polyurethane resin to heat and cure sufficiently. It was measured.

In addition, from the following viewpoints, the performance of manufacturing the packaging materials of Example 24 and Comparative Example 2 was evaluated.

Pot life: In Comparative Example 2, the pot life (30 minutes) of the MD I one-component moisture-curable polyurethane resin is limited, but in Example 24, the pot life is not limited.

Curing time: Comparative Example 2 needs to be cured for about 48 hours to obtain sufficient strength even after curing, whereas Example 24 does not require curing.

Toxicity: Comparative Example 2 is toxic because it uses MD I one-part moisture-curable polyurethane resin. Example 24 is non-toxic because it contains no toxic components.

Tables 3 and 4 show the above results.

Table 3

Tensile strength Elongation Physical properties evaluation

(kgf / cm ² ) (%)

Example 2 9. 7 9 6 5 points 4 points 9 points Comparative example 2 7. 0 5 h 9. div. 2 div. 4 div. Dragon example 3 6. 0 5 0 5 div. 4 div. 9 div. 0 5 fortune 4 fortune 9

Table 4

From the results in Tables 3 and 4, it was found that all of Examples 2 to 4 had better workability than Comparative Example 2 and could be manufactured in a short time. Also, from the results of Example 2 and Comparative Example 2 using the same soft aggregate, it was found that Example 2 had high bow strength and high elongation.

Weather resistance test

The pavement materials of Example 2 and Comparative Example 2 using the same soft aggregate were degraded with ozone using Sunshine Weather-Ome overnight, and the degree of discoloration over time was measured using a colorimeter (Minolta Co., Ltd.). The evaluation was made based on the color difference Δ ある * ab, which is the amount of change in the color value (L * a * b *) measured by CR310, manufactured by the company. The larger the color difference ΔΕ * ab, the greater the degree of discoloration, indicating that the deterioration progressed faster. Fig. 5 shows the results.

From the results shown in FIG. 5, it can be seen that Example 2 has better weather resistance than Comparative Example 2.

Claims

The scope of the claims

1. A large number of aggregates are heated and melted by thermoplastic resin powder mixed with the aggregates.

r Pavement characterized by being combined.

2. The pavement according to claim 1, wherein the porosity is 10 to 40%.

3. After heating the mixture of the aggregate and the thermoplastic resin powder in an amount sufficient to bind the aggregate at the time of heating and melting, the thermoplastic resin powder is melted, and then the molten mixture is cooled. Item 6. A method for producing a pavement, which comprises forming the pavement according to Item 1.

4. The pavement manufacturing method according to claim 3, wherein the aggregate has a particle size of 0.5 to 30 thighs, and the thermoplastic resin powder before heating and melting has a particle size of 10 mesh or less.

5. The pavement manufacturing method according to claim 3, wherein the melting point of the thermoplastic resin powder is in the range of 60 to 200, and the bica and gut softening points are 40 ° C or more.

6. The pavement manufacturing method according to claim 3, wherein a mixing ratio of the thermoplastic resin powder to the total amount of the aggregate is 30 to 50% by volume.

7. A pavement material in which a large number of aggregates are combined by a heated melt of a thermoplastic resin powder mixed with the aggregates and formed into a predetermined shape.

The pavement material according to claim 7, wherein the porosity is 10 to 40%.

9. The pavement material according to claim 7, which is in a block shape or a sheet shape.

10. A mold is filled with a mixture of aggregate and thermoplastic resin powder in an amount sufficient to bind the aggregate during heating and melting, and then heated to melt the thermoplastic resin powder. A method for producing a pavement material, characterized by producing the pavement material according to the above claim, by subjecting the compound to cold press molding.

11. The method for producing a pavement material according to claim 10, wherein the particle size of the aggregate is in the range of 0.05 to 30 and the particle size of the thermoplastic resin powder before heating and melting is 10 mesh or less. .

12. The method for producing a pavement material according to claim 10, wherein the melting point of the thermoplastic resin powder is in the range of & 0 to 200 ° C, and the vicat softening point is 40 ° C or more.

13. The method for producing a pavement material according to claim 10, wherein a mixing ratio of the thermoplastic resin powder to the total amount of the aggregate is 30 to 50% by volume.