JPH01280104A - Structure body of elastic pavement - Google Patents

Abstract

PURPOSE:To make softness and durability compatible by adding polyurethane polymer to ground solid aggregate of a solid rubber system elastic substance, ground foaming aggregate of a foaming rubber system elastic substance and a mixture of pretreatment agent, and mixing to combine them. CONSTITUTION:Grinded solid aggregate of a solid rubber system elastic substance as aggregate to produce elasticity and ground foaming aggregate of a foaming rubber system elastic substance are used to mix, and an pretreatment agent of a polybutadiene system polyol is added to them to mix dispersedly. Polyurethane polymer as hardening resin of binder is mixed to them to combine. When an elastic pavement is built on the basis of that structural body, favorable bearing characteristic and low compression characteristic can be obtained by the multiplier effect of the grinded solid aggregate and ground foaming aggregate.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a soft material that has a relatively low compressive force value and is easy to deform without significantly impairing its durability, for indoor flooring or outdoor paving. It relates to a tactile elastic pavement structure.

[Conventional technology]

Conventionally, elastic floors include floors made of rubber-like molded products and painted floors made of urethane elastomer coated and cured. In addition, in particular, as an elastic floor with small compressive stress, an elastic floor in which powders and granules of rubber, polyurethane, and other elastic bodies are cured with a curable resin is disclosed in Japanese Patent Application Laid-Open No. 52-13.
No. 4235 (Name: Powder rubber mixture), JP-A-63-1
9303 (name 2 elastic pavement method), etc., but the former has insufficient strength and elasticity when using only granular rubber,
It is intended to increase the strength and elongation at break by mixing fibrous rubber with a diameter of 0.5 to 2.5 mm and a length of 5 to 10 mm. This is what was planned.

All of the above forms a durable resilient floor with considerable hardness.

[Problem to be solved by the invention]

The above-mentioned elastic floor is suitable for athletes who have trained through considerable exercise, but a softer elastic floor is desired for built-in jogging courses and walking floors. There is.

Therefore, as improvements to reduce compressive stress, measures such as reducing the amount of binder or reducing the degree of compression during molding to increase the gap are being taken; Although it has the effect of lowering stress, it also reduces strength and significantly reduces durability.

In addition, the length of the diameter with a cross section of 0.5 to 2.5 mmφ is 5 to 1
0IIIIIIl fiber rubber, or linear rubber, and when trying to obtain rubber-like elasticity by the elasticity of such thick linear rubber itself, as the linear rubber progresses over a long period of compressed use, It is easy to separate from the binding material, which not only impairs the appearance but also may cause loss of smoothness necessary for movement.

Therefore, we aim to provide an elastic pavement structure that is soft to the touch and easily deformed without significantly impairing its durability by eliminating aggregates that would cause excessive stress between the binder and the mixed aggregate. It is something to do.

[Means to solve the problem]

In order to achieve the above purpose, as the aggregate that becomes the base material for generating elasticity, crushed solid aggregate of solid rubber-based elastic substances such as rubber, polyurethane and all other elastic polymer substances, and similar elastic polymers are used. A pulverized foamed aggregate of a foamed rubber-based elastic material such as a foamed rubber material is used, the two are mixed, and a pre-treatment agent (polybutadiene-based polyol) is added to a uniformly dispersed mixture. As,
The construction of the structure is based on adding a polyurethane prepolymer, mixing it, and bonding it together to reduce compressive stress, resulting in an elastic pavement structure that is easily deformable and has a soft feel.

The crushed solid aggregate used in this elastic pavement structure is 0.
．． A particle size range of 5 to 8 IIlm is used, preferably 0.5 to 5 mm, in a range of 20 to 80 parts by weight, and the crushed foam rubber aggregate is 0.5 to 8 B mm, preferably 0.5 to 5 mm.
The particle size range of ff1m is used in the range of 80 to 20 parts by weight, and both are mixed to make 10011 parts. The foam aggregate has an apparent specific gravity of 0.2.
-0.8 Preferably about 0.2-0.6, 0.1
If it is less than that, good low compressive stress cannot be obtained. Also, 0.9
Above that, it becomes substantially similar to solid aggregate.

As a pretreatment agent, use polybutadiene polyol, polypropylene glycol, etc. in an amount of 4% to 4% based on the curable resin.
It can be used in a range of 4%, and although the physical properties are increased at 4% or more, the rate of increase is relatively slow.

At 44%, there is a downward trend. The polyurethane prepolymer as a binder is used in an amount of 15 parts by weight or more and 70 parts by weight based on 100 parts by weight of the aggregate, and is usually molded to a thickness of about 10 to 30 mm and cured. If the usage range is less than this range, the bonding force will be small and the durability will tend to be poor, and if it is more than this range, it will be excessive and hard. As the cured resin, a polyurethane resin is preferred since it can provide an extremely large elongation at break.

The above-mentioned crushed solid aggregates include butyl rubber, acrylic rubber, ethylene/propylene rubber, chlorosulfonated rubber, natural rubber, chloroprene rubber, SBR, butadiene and other rubbers, or mixed materials thereof, polyurethane rubber, ethylene vinyl acetate, etc. Appropriately selected products are used.

Further, as the pulverized foamed aggregate, an appropriate selection from the above-mentioned rubber or resin foams is used. As the curable resin, tolylene diinocyanate (TD I>), diphenylmethane diisocyanate (MDI) and other 2
It is a polyurethane prepolymer containing about 5 to 12% free isocyanate, which is made by reacting isocyanates with higher than functional functions and polyethylene glycol, polypropylene glycol, polyester polyol, and other polyols with higher than bifunctional functions in the shell.

[Effect]

The synergistic effect of crushed solid aggregate and crushed foamed aggregate provides suitable support and low compression properties.

〔Example〕

Example-1 A 2001 cement mortar stirrer was equipped with 25 ka of crushed solid aggregate with a particle size of 1 to 3 mm, which was obtained by crushing a solid rubber elastic material, and foamed rubber with an apparent specific gravity in the range of 0.2 to 0.3. Crushed foamed aggregate with a particle size of 2 to 5 mm28
．． 5 kg, mixed for 3 minutes, added 2.5 ka of polybutadiene polyol with a functional group number of 2.2 and a hydroxyl value of 45 to 47 as a pretreatment agent, mixed for 5 minutes to ensure uniform dispersion, and polyurethane as a binder. The prepolymer is
62 parts by weight of MDI was added to 100 parts by weight of polypropylene glycol (PPG) with a molecular weight of 2000 and a hydroxyl value of 56, and the free isocyanate was reacted at 80°C for 3 hours to obtain 10 parts by weight of free isocyanate.
．． Add 22.5 kg of 1% and mix for 3 minutes to make a paving mixture. Immediately spread it over an area of approximately 8.812 square meters of cleaned and primed concrete, and use an iron roll to roll it in 3 vertical and horizontal directions. The sheet was molded to a thickness of approximately 15 mm by rotational pressure, and after being left for 7 days, the sheet was sampled for property measurement and a walking test was performed.

Example-2 The same materials and equipment as in Example-1 were used, including 50 kg of solid rubber aggregate, 19 ka of foamed rubber aggregate, and 2.5 kg of pretreatment agent.
kg, polyurethane prepolymer 22.5ka, was mixed in the same manner as in Example-1, spread over an area of approximately 9.3m2 of similarly treated concrete, and rolled in the same manner as in Example-1. The material was pressed to a thickness of about 15 mm, and an elastic pavement structure was obtained in the same manner as in Example-1.

Comparative Example-1 In this example, 100 kg of the same solid rubber aggregate as in the example was used.
, 2.5 kill of pre-treatment agent, and polyurethane prepolymer 11k (II) were mixed in the same manner as in Example, and spread over an area of approximately 10.5♂ on concrete treated in the same manner as in Example-1. Approximately '15
It was molded to a thickness of mm to obtain an elastic pavement structure in the same manner as in the example.

Comparative Example-2 In this example, 100 kg of the same solid rubber aggregate as in the example was used.
, pre-treatment agent 2.5 KC+, and polyurethane prepolymer 22.5 kg were mixed in the same manner as in Example-1, and the concrete was treated in the same manner. Approximately 12.2 T
r? Spread the area by 1 and use a metal trowel (trowel) without using an iron roll.
The elastic pavement structure was molded flat to a thickness of about 15IllIIl to obtain an elastic pavement structure in the same manner as in the example.

Comparative Example-3 In this example, the same solid rubber aggregate as in the example was used at 100k (
1. Using 2.5 kg of pre-treatment agent and 22.5 kg of polyurethane prepolymer, the concrete was mixed in the same manner as in Example-1 and treated in the same manner. Approximately 9.5 Tr?
It was spread over an area of about
It was molded to a thickness of 5 mm to obtain an elastic pavement structure in the same manner as in the example.

Note that the differences in the configuration of the above comparative example will be explained.

Comparative Example 1 uses a small amount of polyurethane prepolymer as a binder, and Comparative Example 2 uses an increased amount of binder, but the pressure during rolling is reduced and the compressive stress is reduced by 10%. 2.
This is an example aiming at a soft feel of about 5 km cm2. However, in Comparative Example-1, the amount of bonding material was not sufficient, and in Comparative Example-2, the adhesion between the base materials (insufficient adhesive area)
It is difficult to obtain a homogeneous coating material because of insufficient Therefore, as shown in Comparative Example 3, it is necessary to use the binder in an amount of about 15 to 22.5 parts by weight per 100 parts by weight of the aggregate, and the rolling pressure must also be sufficient.

The above Comparative Example-3 has a proven track record as an elastic paving material for tennis courts, promenades, multi-route golf courses, etc.

Next, the compositions and physical properties of the elastic pavement structures of Examples and Comparative Examples are shown on the vest.

(The following is a margin) (Note) The numbers in parentheses in the examples are values calculated so that the total of solid rubber and foamed rubber aggregate is 100 parts by weight.

The numerical values in parentheses for the pretreatment agent and the binder are converted values for a total of 100 aggregates.

The sampling sheet in the table above is 20 cm from the elastic pavement structure molded in each Example and Comparative Example.
A sample with a sheet size of 20 cm x 20 cm was cut, and the average thickness of 9 points of intersection of the grid of the base divided into 5 cm in length and width was calculated, and the weight was divided by 4 from the volume to obtain the apparent specific gravity. The compressive stress was measured using a load plate with a diameter of 30 mm at three points in the diagonal direction of the intersection of the grids on the base of the specimen, and the average value was determined.

Tensile strength, elongation at cutting, and tear strength are JISK63
This was carried out in accordance with 01.

As shown in the table above, the characteristics of the elastic pavement structure of this invention are as follows: In the case of solid rubber aggregate, low compressive stress cannot be obtained unless the density is made coarse; however, by using aggregate mixed with foamed rubber aggregate, A low compressive stress equal to or lower than Comparative Example-1 and Comparative Example-2 is obtained, and while a soft walking feeling is obtained, excellent properties such as strength and elongation are obtained, and excellent durability is maintained.

〔Effect of the invention〕

Since the elastic pavement structure of the present invention has the functions described in the function section above, a durable sheet with an extremely soft walking feeling can be obtained.

Claims (3)

[Claims] (1) Pulverized solid rubber aggregate made of solid rubber-based elastic material and crushed foamed rubber aggregate made of foamed rubber-based elastic material are mixed, and then polybutadiene-based polyol is added to the mixture, which is uniformly dispersed and mixed, and cured. An elastic pavement structure for pavements, which is based on a structure in which polyurethane prepolymer is added as a flexible resin, mixed and bonded together. (2) Claim 1 in which a pigment, toner, or other filler material is mixed into the basic structure as necessary.
The elastic pavement structure described. (3) Claim 1 in which pulverized solid rubber aggregate is used in a range of 20 to 80 parts by weight and pulverized foamed rubber aggregate is used in a range of 80 to 20 parts by weight, and both are mixed to make 100 parts by weight.
The elastic pavement structure described.