JPS60246879A - Manufacture of rubbery mat from waste - Google Patents

Abstract

PURPOSE:To obtain a soundproofing rubbery mat, by using a waste rubber left after the production of a regenerated rubber or a rubbery material mixed with fibrous material as a base, mixing the base with a latex, softener and a vulcanizing agent, and forming the mixture in a mold. CONSTITUTION:The waste rubber left after the collection of regenerated rubber from a waste rubber product such as waste tire, or a rubbery material containing fibrous material (e.g. nylon fiber) from which regenerated rubber cannot be collected (including the material containing 10-95wt% fibrous material), is used as a base. 100pts.wt. of the base is mixed with 1-12pts. of a latex, 1-10pts. of a softener and 0.1-1pt. of a vulcanizing agent, and the mixture is filled in a mold and molded under high temperature and pressure to obtain a rubbery mat having a density of 0.6-2.5g/cm<3>. The mat is resistant to tear and disintegration, has high softness and soundproofing performance, and has extremely high utility.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention uses the waste left after collecting recycled rubber and the waste discharged during the manufacturing process of various rubber products, and molds it into rubber plates such as soundproof cloaks. Relating to a method of manufacturing.

Currently, the remaining waste from recycled rubber extraction, as well as Tiron, Tetron, and polyester, cannot be reused and are crushed as industrial waste, buried in landfills, or burned.

The amount of rubber industrial waste mixed with rayon, etc. is enormous, and its disposal poses many problems.

Therefore, from the perspective of reusing resources, there is a need to develop a technology that uses these resources to manufacture low-cost rubber plates.

By the way, the technology of making rubber plates using recycled rubber has been researched in various fields and has already been actually applied. but,
To use this as a soundproof cloak, for example,
There are problems such as the high manufacturing cost and lack of marketability, and the fact that although it has sound insulation performance, it has little vibration damping effect.

We use materials other than rubber (e.g. nylon).

Is it possible to collect waste that cannot be reused as recycled rubber because it is contaminated with tetron, polyester, rayon, etc., or whether it is possible to take recycled rubber at a recycled rubber manufacturing factory and turn it into recycled rubber? As a result of intensive research on whether it is possible to add anti-vibration effects to
The inventors have discovered that the desired material can be obtained by molding the above-mentioned material together with latex at high temperature and high pressure, and have thus arrived at the present invention.

In other words, the gist of the present invention is to collect recycled rubber from rubber waste such as scrap tires or rubber materials containing fiber materials such as nylon, tetron, and polyester from which recycled rubber cannot be collected. The material is the base material,
A method for manufacturing a rubber plate is characterized in that latex, a softener, and a vulcanizing agent are mixed therein, the mixture is filled into a mold, and the mixture is molded at high temperature and high pressure.

Generally, it is widely known that a vulcanizing agent is blended into a rubbery material having double bonds, and the mixture is heated and pressurized to vulcanize it to form a three-dimensional network structure, giving it the strength of a single core of rubber elasticity. However, for rubber materials other than rubber materials that contain a large amount of fibrous materials with voids (e.g. nylon, Tetron, polyester fibers, etc.), it is necessary to accelerate the vulcanization of the materials and to strengthen the bonds between particles. In the present invention, by molding the above-mentioned material under high temperature and high pressure, voids caused by the fibrous material are removed, and latex is used as a binder to strengthen the interaction between rubber particles. The rubber particles are softened and crimped to strengthen their physical bonds, and the chemical bonds in the three-dimensional network structure created by the vulcanization of the rubber particles create a strong bond between the rubber particles, thereby increasing the rubber elasticity and mechanical strength. It was possible to manufacture a rubber plate that is rich in vibration and has an excellent vibration-proofing effect at a low cost.

In the present invention, the rubber material used is any rubber material such as SBR, isoprene rubber, natural rubber, etc., and a fiber material such as nylon, Tetron, cotton, etc., and has a length of 1
Rubber powder such as rubber molding waste, recycled rubber, etc., including flocculent particles with a size of 100 μ or more and less than 100 μ, such as cotton yarn and fluff-like lint generated from looms, spinning machines, and twisting machines. It is a mixture of arbitrary fiber materials. In the known rubber plate, the amount of fiber material mixed is 10%.
In the present invention, the fiber material is contained in an amount of about 10 to 95% by weight when internally cut. Also, latex is S
Rubbery substances such as BR, chloroprene, isoprene, etc.
For example, SBR latex (Nippon Zeon LX-430) is used. The softener may be any nonvolatile oily substance, such as machine oil. As the vulcanizing agent, sulfur or a compound containing sulfur can be used. In addition, the vulcanization temperature is 100
-160°C, preferably 140-150°C. The press pressure is 50-200 kg/cd, preferably 100-160 kg/aa. The vulcanization time varies depending on the amount of rubber blended, but is from 20 minutes to 120 minutes. In the present invention, 10 parts by weight of latex is used for 100 parts by weight of rubber material.

It is desirable to add 1 to 10 parts by weight of a softener and 0.1 to 1 part by weight of a vulcanizing agent. If the value is less than the above lower limit, vulcanization will be insufficient, fusion will be poor, and the rubber plate will break, crack, and become flaky, making it difficult to manufacture a rubber plate that is useful. In addition, in the case of the upper limit of the above numerical value, the vulcanization of the vulcanizing agent is accelerated too much,
It becomes a hard rubber plate with no flexibility, and its vibration isolation properties are poor. There is a risk that the softener will bleed and melt during use. In addition, due to the moisture content of latex, voids occur due to steam during press molding, making it impossible to produce a good rubber plate.

The rubber plate of the present invention includes the above-mentioned rubber material, latex,
It is formed by mixing a softener and a vulcanizing agent, filling the mixture into a mold, and molding it at high temperature and pressure. During the compounding and molding, the density of the obtained rubber plate was 0.6
It is desirable that it is ~2.5g/c+d. If it is less than 0.6, it will not become a rubber plate, and if it is more than 2.5, the vibration-proofing properties will decrease and flexibility will be lost. Especially 0.6 to 1.0 g/Cm
3 is preferred.

In addition, iron powder, raw powder, and burr 1 are used to improve sound insulation performance.
-mu, etc. can be mixed.

The above-mentioned high-temperature and high-pressure treatment lowers the softening point of the fibrous material, reduces the volume due to the pressure, and causes the fibers to be crimped and entangled with each other. In this way, the fibrous material is fixed within the rubber as a fibrous mass with appropriate voids, contributing to the formation of a lightweight rubber plate with high tensile strength.

Example Make a mixture using the following formulation.

SBR latex (Nippon Zeon LX-430) 5 Machine oil (Idemitsu Oil Turbine oil P-32) 5 Sulfur powder 1 Vulcanization accelerator (Nobucella DM) 0.3 Place the above mixture into a mold and heat the mold to 145°C ± Heat to 2°C, 150
A pressure of kg/aa was applied and vulcanization was carried out for about 50 minutes.

The obtained rubber plate had a density of 0.90 g/cd, a tensile strength of 25.8 kg/aJ, and a tensile elongation of 45%.

The rubber board obtained by the present invention can be used, for example, for floors and walls.

It can be used as a soundproofing material for ceiling materials, and because of its low density, it greatly weakens the sound pressure of impact sounds due to its vibration-proofing performance, and has a high vibration damping rate, so the sound disappears quickly.

Therefore, it has excellent sound insulation performance.

Claims (4)

[Claims] (1) The base material is waste obtained after collecting recycled rubber from rubber waste such as scrap tires, or rubber materials mixed with fiber materials such as nylon, Tetron, polyester, etc. from which recycled rubber cannot be collected. , this and latex,
A method for manufacturing a rubber plate, which comprises mixing a softener and a vulcanizing agent, filling a mold with the mixture, and molding at high temperature and high pressure. (2) The above waste or rubber material is 10 to 95% by internal grinding.
% by weight of a fibrous material. (3) For 100 parts by weight of the above base material, 10 parts by weight of latex
Claim (1) characterized in that 1 to 10 parts by weight of a softening agent and 0.1 to 1 part by weight of a vulcanizing agent are mixed.
2. Method for manufacturing a rubber plate as described in Section 1. (4) The density of the above rubber plate is 0.6 to 2.5 g/cJ
A method for manufacturing a rubber plate according to claim (1).