JP2004115306A - Composition for paving material and paving method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a composition for paving materials, by which pulverized wood, especially trees including branches and leaves generated on pruning. <P>SOLUTION: The composition for paving materials contains pulverized wood (A) and a binder (B). The binder (B) consists of a resin having a structural unit (i) based on an olefin and a structural unit (ii) based on an α, β-unsaturated carboxylic acid or its anhydride. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
[Industrial applications]
The present invention relates to a pavement material composition and a pavement method used for sidewalks, park roads, and the like. More specifically, the present invention is mainly composed of a crushed tree, especially a crushed tree including branches and leaves, which is generated in large quantities when pruning a tree planted on a street or a park, etc. The present invention relates to a pavement material composition containing a resin having adhesiveness as a binder.
[0002]
[Prior art]
Conventionally, on sidewalks, promenades, park park roads, cycling roads, jogging roads, tennis courts, footpaths, playgrounds, pavement on plazas, crushed sand, gravel, shells, wood chips, crushed ceramic firing products, concrete Various methods have been proposed for pavement by using a crushed material or the like as an aggregate and consolidating the aggregate using an epoxy resin as a consolidation material (for example, see Patent Documents 1 to 3).
On the other hand, especially in urban areas, in recent years, many trees have been planted on streets and parks due to the increase in greening parts from the viewpoint of improving the living environment. These trees need to be pruned periodically as they grow or to maintain the landscape by shaping the trees.
[0003]
[Patent Document 1]
JP-A-8-259296 [Patent Document 2]
Japanese Patent Application Laid-Open No. H10-60804 [Patent Document 3]
JP 2002-37984 A
[Problems to be solved by the invention]
Some trees, including branches and leaves, generated by the above-described pruning have been used in the form of compost or mulch from the viewpoint of reducing the burden on the natural environment and recycling. However, with the increase in the amount of trees generated by pruning, these methods cannot be completely treated, and the trees generated by pruning have to be treated by inevitable disposal methods, such as incineration and land reclamation, which are less than optimal. ing. In particular, the disposal method by incineration has problems such as the processing capacity of existing incinerators and the generation of carbon dioxide by incineration.
Thus, an object of the present invention is to effectively utilize trees, including crushed wood, especially trees and leaves generated by pruning, which are not preferable from an environmental point of view, and not simply waste. An object of the present invention is to provide a pavement material composition and a pavement method applicable to a sidewalk, a promenade, a park path, and the like.
[0005]
[Means for Solving the Problems]
The inventor of the present invention has found a pulverized product of a tree, in particular, a pulverized product of a tree including branches and leaves, which is generated by pruning, a composition using a resin having a specific structural unit as a binder, and further, if necessary, an emulsion and / or Alternatively, they have found that a composition to which a cross-linking agent is added gives a good cured product and can be used as a paving material composition that is easy to apply, and has completed the present invention.
[0006]
That is, the present invention
{Circle around (1)} containing a ground wood (A) and a binder (B), wherein the binder (B) is a structural unit (i) based on an olefin and a structural unit based on an α, β-unsaturated carboxylic acid or an anhydride thereof And (ii) a resin for a pavement material.
Also, the present invention
(2) A pavement material composition further comprising the emulsion (C) in the (1) pavement material composition.
Further, the present invention provides
(3) A pavement composition according to (1) or (2), further comprising a crosslinking agent (D).
[0007]
In the composition for a pavement material according to the above (1) to (3), the crushed tree (A) is obtained by crushing a tree generated by pruning, and the binder (B) is further composed of isobutylene and maleic anhydride. A preferred embodiment is an alternating copolymer resin of the above or a modified product thereof.
And the present invention
(4) A pavement method in which the composition for a pavement material according to any one of (1) to (3) is spread and rolled.
[0008]
BEST MODE FOR CARRYING OUT THE INVENTION
The crushed wood (A) used in the present invention naturally includes crushed timber, but is preferably generated by pruning trees planted in streets and parks from the viewpoint of reducing waste. A crushed tree including branches and leaves is used. There is no limitation on the type of tree, and there is no problem even if several types are mixed, and even if each part of the tree such as a trunk, a branch, and a leaf remains mixed.
[0009]
The shape, size, and the like of the crushed wood (A) can be arbitrarily determined according to the purpose. However, when used as a pavement material composition on the premise that a person such as a promenade walks, from the viewpoint of feeling when walking, the maximum length of the crushed material is usually crushed to a range of 5 mm to 10 cm. It is preferable to use those that have been used.
[0010]
The binder (B) used in the present invention comprises a resin having a structural unit (i) based on an olefin and a structural unit (ii) based on an α, β-unsaturated carboxylic acid or its anhydride. Such a resin is obtained by, for example, radically polymerizing an olefin and an α, β-unsaturated carboxylic acid or its anhydride with a radical initiator in a solvent in which they are dissolved.
[0011]
Examples of the olefin that can be used for the structural unit (i) based on the olefin include ethylene, propylene, 1-butene, 2-butene, isobutylene, n-pentene, 2-methyl-1-butene, n-hexene, and 2-methyl-. Examples thereof include 1-pentene, 3-methyl-1-pentene, 4-methyl-1-pentene, 2-ethyl-1-butene, and diisobutylene. Of these, isobutylene is particularly preferred.
[0012]
Examples of the α, β-unsaturated carboxylic acid or anhydride which can be used for the structural unit (ii) based on α, β-unsaturated carboxylic acid or anhydride include (meth) acrylic acid, maleic anhydride, and maleic acid. , Itaconic acid, crotonic acid, fumaric acid, mesaconic acid and their acid anhydrides. Of these, maleic anhydride is particularly preferred.
[0013]
The resin having the structural unit (i) based on olefin and the structural unit (ii) based on α, β-unsaturated carboxylic acid or its anhydride includes (meth) acrylic acid as long as the gist of the present invention is not impaired. (Meth) acrylates such as methyl, ethyl (meth) acrylate and propyl (meth) acrylate; and aromatic vinyl compounds such as styrene may be further copolymerized.
[0014]
Further, the number average molecular weight of the resin having the structural unit (i) based on the olefin and the structural unit (ii) based on the α, β-unsaturated carboxylic acid or anhydride thereof is determined based on the performance as a binder and the water to be described later. Is preferably in the range of 6,000 to 100,000 from the viewpoint of solubility.
[0015]
Particularly preferred for use as the binder (B) used in the present invention are, as described above, isobutylene as the olefin-based structural unit (i), and a structural unit based on an α, β-unsaturated carboxylic acid or an anhydride thereof ( ii) An isobutylene-maleic anhydride alternating copolymer resin polymerized using maleic anhydride. After polymerization, the resin may be used as a modified product in which at least a part of the maleic anhydride residue is reacted with ammonia or an amine to be converted into an amide, and further, a modified product obtained by converting the resin into an imide group by heating.
[0016]
When the above-mentioned resin having the structural unit (i) based on an olefin and the structural unit (ii) based on an α, β-unsaturated carboxylic acid or its anhydride is used as the binder (B), workability and the like are required. In view of the above, at least a part, preferably 30 to 100%, of a carboxyl group or its anhydride residue (maleic anhydride residue when maleic anhydride is used) is neutralized in water with an alkali compound, and It is extremely preferable to impart the property and use it as an aqueous solution. When an acid anhydride group is present in the copolymer, the amount of the alkali compound is adjusted so that the acid anhydride group corresponds to two carboxyl groups. Preferred alkali compounds that can be used include, for example, amine compounds such as ammonia, methylamine and ethylamine; and alkali metal or alkaline earth metal hydroxides such as sodium hydroxide, potassium hydroxide and calcium hydroxide. The solid content in an aqueous solution obtained by neutralizing a resin having a structural unit (i) based on an olefin and a structural unit (ii) based on an α, β-unsaturated carboxylic acid or an anhydride thereof in water is determined. Although there is no particular limitation, it is usually preferable to be in the range of 5 to 40% by mass.
[0017]
In the composition for a pavement material of the present invention, the amount of the binder (B) used relative to the pulverized wood (A) is determined by properties, economics, and the like required for the pavement material. A) It is preferably in the range of 1 to 200 parts by mass with respect to 100 parts by mass, and more preferably in the range of 20 to 100 parts by mass from the viewpoint of durability and economy.
[0018]
The pavement material composition of the present invention may further contain an emulsion (C) as necessary, in addition to the above-mentioned pulverized wood (A) and binder (B). Examples of the emulsion (C) include a synthetic rubber latex such as a vinyl acetate emulsion and an SBR latex. Among these, SBR latex is preferred from the viewpoint of the flexibility of the pavement material composition (feel when walking on the sidewalk). When the emulsion (C) is added, the amount of the emulsion (C) is not strictly limited. However, from the viewpoint of the flexibility of the pavement material composition, the emulsion (C) is usually added to the solid content in the binder (B). It is preferable to mix in a range of 10 to 300% by mass as a solid content therein, and it is more preferable to mix in a range of 20 to 150% by mass.
[0019]
Further, in the pavement material composition of the present invention, the above-mentioned crushed wood (A) and binder (B) may further contain a crosslinking agent (D) as necessary. The crosslinking agent (D) has a role of improving the water resistance of the binder (B) by reacting with a carboxyl group residue or an acid anhydride group residue in a resin constituting the binder (B). Examples of the crosslinking agent (D) include water-soluble compounds such as polyethyleneimine; glyoxal; water-soluble epoxy compounds such as glycerol polyglycidyl ether and trimethylolpropane polyglycidyl ether. Among these, a water-soluble epoxy compound such as glycerol polyglycidyl ether and trimethylolpropane polyglycidyl ether is preferred from the viewpoint that the crosslinking reaction can be performed uniformly. When the cross-linking agent (D) is added, the amount used is not strictly limited, but is usually in the range of 0.1 to 20% by mass based on the solid content in the binder (B). preferable.
[0020]
In the pavement material composition of the present invention, in addition to the above-described components, starch, a cellulose-based compound such as carboxymethyl cellulose, calcium carbonate, and an additive such as an inorganic powder such as talc may be further added, if necessary. Good.
[0021]
The composition for a pavement material of the present invention is obtained by stirring a pulverized wood (A) and a binder (B), and optionally an emulsion (C) and / or a crosslinking agent (D), and further optionally an additive. It can be prepared by mixing using an existing mixer such as a tank or a rotary mixer.
[0022]
As a method of applying the pavement material composition of the present invention, for example, the pavement material composition is evenly spread, laid at a predetermined place with a rake, a trowel, a finisher, or the like, and rolled with a trowel, a roller, or the like. Pressing, compacting and curing. In addition, only the crushed wood (A) is spread in a predetermined place in advance, and the binder (B) or the emulsion (C) and / or the crosslinking agent (D), if necessary, is further added to the binder (B). It is also possible to adopt a method in which an aqueous solution to which an additive is added according to the above method is applied or sprayed to the ground pulverized wood (A) by a method such as spraying or the like to perform construction.
[0023]
The composition for pavement material of the present invention does not require a heating device or the like, and the moisture in the binder (B) evaporates by leaving it standing for about 1 day to 7 days after application, and the crosslinking agent (D) In the case where is used, solidification can be achieved by the progress of the crosslinking reaction.
[0024]
The composition for pavement material of the present invention effectively utilizes not only incineration treatment which is not preferable from an environmental point of view, but also simply waste as a crushed tree, particularly a tree including branches and leaves generated by pruning. It can be used effectively for pavement such as sidewalks, promenades, and park roads.
[0025]
【Example】
Hereinafter, the present invention will be described more specifically with reference to examples, but the present invention is not limited to these examples.
[0026]
Example 1
(1) A tree containing branches and leaves (zelkova, ubamegashi, cherry blossoms mixed at an approximately equal ratio) generated by pruning a street tree is crushed to obtain a crushed tree (A) having an average diameter of about 2 cm. Was. However, since the crushed product (A) of the tree was crushed together with the leaves and twigs, the size of the crushed product was widely distributed in the range of several mm to 4 cm.
On the other hand, isobutylene-maleic anhydride alternating copolymer resin (trade name “Isoban 10”, manufactured by Kuraray Co., Ltd.) is neutralized with ammonia water to neutralize 80% of maleic anhydride residues to obtain a solid content. Was obtained as a binder (B). SBR latex (trade name “JSR Latex 0602”, manufactured by JSR Co., Ltd .; solid content concentration: 52% by mass) is used as the SBR solid content in this binder (B) as an isobutylene-maleic anhydride alternating copolymer resin 100. A glycerol polyglycidyl ether was added as a crosslinking agent in an amount of 100 parts by mass with respect to 100 parts by mass with respect to 100 parts by mass of the isobutylene-maleic anhydride alternating copolymer resin. After adjusting the solid content concentration to 20% by mass by further adding water to this mixture, the obtained mixture is in a ratio of 40 parts by mass per 100 parts by mass of the previously obtained pulverized wood (A). And mixed to obtain a composition for a pavement material.
[0027]
(2) The pavement material composition obtained in (1) was laid on the ground so as to have a thickness of 10 cm, pressed with a trowel, compacted by compaction, and left as it was for 3 days. After confirming that it is dry, walk on it in a normal state, and examine the feeling of walking and the state of retaining the form of the pavement material. I couldn't get it. Thereafter, observation was continued for another 30 days, and it was confirmed that the crushed wood did not fly due to rain or wind, and maintained the initial flexibility and form.
[0028]
Comparative Example 1
Only the crushed wood (A) obtained in Example 1 was laid in the same manner as (2) in Example 1 and evaluated in the same manner as in Example 1. In this case, the crushed wood (A) returned to its original state without compaction even after rolling, and the walking feeling was too soft. In addition, the crushed wood (A) moves in places as it walks, and the shape becomes uneven, and the periphery of the crushed wood (A) whose shape is adjusted is scattered due to wind and the like, and it is unsightly. It became a state.
[0029]
【The invention's effect】
ADVANTAGE OF THE INVENTION According to this invention, the incineration which is not preferable from an environmental point of view, and the pavement which can be utilized effectively rather than the crushed tree, especially the tree containing the branches and leaves which generate | occur | produce by pruning, as waste. A composition for the material can be provided. Such a pavement material composition can be effectively used for pavement materials such as sidewalks, promenades, and park roads.

Claims (6)

It contains a ground wood (A) and a binder (B), wherein the binder (B) is a structural unit (i) based on an olefin and a structural unit (ii) based on an α, β-unsaturated carboxylic acid or an anhydride thereof. A composition for a pavement material, comprising a resin having the following. The composition for paving material according to claim 1, further comprising an emulsion (C). The pavement material composition according to claim 1 or 2, further comprising a crosslinking agent (D). The composition for pavement materials according to any one of claims 1 to 3, wherein the crushed wood (A) is obtained by crushing a tree generated by pruning. The pavement material composition according to any one of claims 1 to 4, wherein the binder (B) is an alternating copolymer resin of isobutylene and maleic anhydride or a modified product thereof. A pavement method in which the composition for a pavement material according to claim 1 is spread and compacted.