JPS6096413A - Manufacture of composite rubber product - Google Patents

Abstract

PURPOSE:To obtain a composite new material, by a method wherein after vulcanized rubber formation such as the tread of a waste tire has been granulated a molecular chain is torn off by grinding the same by applying to an attriator along with cooling water and mechanochemical reaction is made to generate between the crushed waste tire and an identical quantity of natural or synthetic rubber well-kneaded separately. CONSTITUTION:Vulcanized rubber such as the tread rubber of a waste tire is granulated by a twin-roll mill or a crusher. Then its molecular chain is torn off by grinding the same by applying to a gap of two sheets of hard and wearproof attrition rotary plates provided in an overlapped state by narrowing the gap. The material come out is sent to a three-roll dehydrator through a stream. The material is supplied to rolls after separation from water and turned into a platelike state through heating and pressing. Then mechanochemical reaction is generated between the above material and natural or synthetic rubber well-kneaded separately which is to be loaded to the above material for kneading. In addition to the above, after the kneading has been kept on by loading processing ingredients such as a very small quantity of a heating agent, a valcanizing auxiliary and a reinforcing agent, crosslinking molding is done by heating and a composite new material is obtained.

Description

[Detailed Description of the Invention] Jin's invention is a novel method in which different vulcanized rubber and raw rubber and synthetic resin and raw rubber are mechanochemically reacted using the affinity generated by tearing off the molecular chains of different polymer compounds. In relation to the manufacturing method of composite rubber products, the purpose of which is to obtain composite rubber products extremely efficiently and effectively, vulcanized rubber materials such as piles, waste tire treads, and waste rubber toys are crushed into coarse particles. Afterwards, this is ground together with cooling water in a grinder consisting of hard, wear-resistant grinding rotary plates similar to those used in a mill and a grinder, which are made up of two overlapping plates with narrowed gaps, and the molecular chains are removed. By using the newly created affinity between molecules, a mechanochemical reaction is caused between the same amount of natural or synthetic raw rubber that has been separately well-stripped.
Furthermore, after adding and kneading a small amount of compounding agents such as a vulcanizing agent, a vulcanizing aid, and a reinforcing agent, the mixture is cross-linked as a whole by heating and molded into a new composite material, Or gt), after coarsely crushing the synthetic resin or recycled synthetic resin, it is crushed together with cooling water from a hard and wear-resistant grinding rotary plate such as a grinding mortar, which is made of two overlapping stones arranged opposite each other with a narrowed gap. The molecular chains are broken off by grinding them in a grinder made of rubber, and the new affinity generated between the molecules is utilized to add the same amount of natural or synthetic raw rubber that has been separately well-grinded. , kneaded by a kneading machine such as parallel rolls to cause a mechanochemical reaction between the two, and further,
To this, a polyfunctional unsaturated ester, a crosslinking agent, a reinforcing agent, and other necessary compounding agents are added and mixed, and this mechanochemical reaction is heated to the softening temperature of the synthetic resin. It is characterized by molding and crosslinking the polyfunctional unsaturated ester that has permeated the rubber, synthetic resin, and compounding agent into a new material.

The hard and wear-resistant grinding rotary plate of the grinder according to the invention of this application is made of a suitable hard and wear-resistant material such as stone, ceramics, and hard cast metal, and its surface is coated with a material similar to that used in inkstone mortars. A plurality of sets of a plurality of diagonal zigzag grinding concavo-convex strip groups are provided.

Further, in order to make the mutual relation speeds of the two hard and wear-resistant grinding rotary plates different, one of them is stopped, and the two rotation speeds are made different, or they are rotated in opposite directions.

In general, polymer compounds with different properties do not chemically react with each other in a normal manner.

Therefore, in the conventional manufacturing method of composite products of polymer compounds, materials having good miscibility with each other are blended, or
For example, carbon/fiber-containing plastics, etc., have been developed by mutually utilizing the characteristics of each material.
The performance of the product cannot exceed the combined properties of these materials.

Then, (0), when the polymer material is crushed mechanically with a roll or the like to break off the molecular chains and cause mechanical splitting, (b), this mechanically split polymer compound The shortened molecule has an active property at both ends, induces a secondary chemical reaction, and combines with coexisting polymers or monomers to form a copolymer. (
This is called mechanochemical reaction technology 6) If the performance of both is combined, a new turbidity d! can get.

In order to obtain composite rubber products by utilizing this mechanical reaction, in the invention of the specification of the prior patent application Shojt-/3711/4j, (1) the tread of waste tires
, pulverize vulcanized rubber materials such as waste rubber toys, narrow the gap, put the vulcanized rubber powder through a kneading machine such as nine parallel rolls, cool it, and repeatedly pulverize it. Using the new affinity generated between the molecules, a mechanochemical reaction is caused between the same amount of natural or synthetic raw rubber that has been separately well-stripped, and further After adding and kneading a small amount of compounding agents such as a vulcanizing agent, a vulcanizing aid, and a reinforcing agent, they are cross-linked together by heating to form a new composite material.The tread of a waste tire or Rubber-sized synthetic resin or recycled synthetic resin is kneaded in a kneading machine such as two parallel rolls to cause a mechanochemical reaction, and a polyfunctional unsaturated ester and a crosslinking agent are added thereto, and further, Adding reinforcing agents and other necessary compounding agents, continuing to cross-wire by applying a water kneading method such as two parallel rolls, causing a mechanochemical reaction, heating the product to the softening temperature of the synthetic resin, and then heat molding. rubber, synthetic resin,
It has been developed to crosslink polyfunctional unsaturated esters that have permeated compounding agents to create a new material, and to obtain composite rubber products from rubber such as raw rubber or recycled rubber and synthetic resin or recycled synthetic resin. There is.

As in the invention of this prior patent application No. 11-137111, the crushing of rubber and the tearing off of molecular chains by a kneading machine such as parallel rolls occur when the rubber passes through gaps or contact points between parallel rolls having different rotational speeds. only happens.

Therefore, in order to enhance the crushing effect, this process must be repeated. .

Parallel rolls are convenient because they allow cross-contact, but they are acknowledged to be less efficient in crushing and tearing off molecular chains.

Furthermore, since crushing rubber and tearing molecular chains generally generate heat, the machine used must be cooled.

In the case of rolls, the inside is usually hollow and the cooling is done through cooling water, so the cooling is indirect.
Moreover, the efficiency is low.

On the other hand, the invention of this application is based on the earlier patent application Sho SR -
According to the invention of this application, which eliminates the drawbacks of the invention of specification No. 137111 and makes it more efficient, (1)
After coarsely pulverizing vulcanized rubber materials such as waste tire treads and waste rubber toys, this material is crushed with cooling water to create a hard, wear-resistant grinder such as that used in two enamel mills placed opposite each other with a narrow gap. The molecular chains are broken off by grinding in a grinder consisting of a rotating plate, and the newly generated affinity between the molecules is utilized to create a mixture with the same amount of natural or synthetic raw rubber that has been thoroughly masticated separately. A mechanochemical reaction occurs between
Furthermore, after adding and kneading a small amount of a vulcanizing agent, a vulcanizing aid, and a reinforcing agent, these are crosslinked together by heating and molded into a new composite material, or
(11) After coarsely pulverizing synthetic resin or recycled synthetic resin, it is made up of two hard, wear-resistant grinding rotary plates similar to those in a mortar, which are placed together with cooling water and overlapped with each other with a narrowed gap. Grind it in a grinder and tear off the molecular chains)
By using the newly generated affinity between molecules, the strands are separately made well, then the same amount of natural or synthetic raw rubber is added, and the mixture is kneaded by a kneading machine such as parallel rolls. A mechanochemical reaction is caused to occur, and then a polyfunctional unsaturated ester, a crosslinking agent, a reinforcing agent, and other necessary compounding agents are added to this to continue mixing, and this mechanochemical reaction is used to soften the synthetic resin. After heating to temperature,
The nine oaks are made by heat molding and cross-linking polyfunctional unsaturated esters that have penetrated into rubber, synthetic resin, and compounding agents to form a new material, so it is similar to traditional stones and mills. Due to the action of the parallel rolls, the parallel rolls are also ground over a wider surface, resulting in fine pulverization and tearing off of molecular chains. Therefore, its cooling is effected directly and its transport to the Amld equipment can be carried out by pipes using water flow, and if necessary, it can be It can be guided onto a screen and easily separated from water.

Furthermore, if the remaining water is squeezed out using three heated rolls, the rubber that has become ultra-fine particles will be left behind due to the grinding, and the rubber that has become ultra-fine particles will be Since it has a new affinity for , it forms a plate and emerges from between the rolls on the opposite side.

This rubber is plastic and is very useful as it can be used as recycled rubber, either as is or by adding a small amount of plasticizer on a mixing roll.

Examples of the invention of this application will be described below.

(I) Vulcanized rubber IOθ, such as tread rubber of waste tires or waste rubber toys, was crushed into pieces using a crusher, etc., and then placed together with cooling water in a narrowed gap and polymerized. The material is placed between the gaps between a hard, wear-resistant grinding rotary plate, ground, and its molecular chains are broken off. send to a dehydrator.

η0 3 Honda Le's dehydrator has three rolls superheated with steam, one of which is equipped with a screen, through which the rubber is
After being separated from the water, it is fed to rolls where it is heated and pressurized to further lose moisture and emerge from the other side in the form of a plate.

This is thoroughly masticated, and the same amount of natural or synthetic raw rubber is added and kneaded to cause a mechanochemical reaction between the two, and further, a trace amount of a vulcanizing agent,
After adding compounding agents such as vulcanization aids and reinforcing agents and kneading,
By heating, these materials are cross-linked and molded into a new composite material.

The molded product has a tensile strength of approximately 177 and an elongation rate of 4.
He has a score of 440%.

In the case of using powder obtained by simply crushing the tread rubber, the tensile strength is less than (-1) and the elongation rate is less than 1. This indicates that it acted as an agent.

Currently, for example, tread rubber from old tires and vulcanized rubber from waste rubber toys are desulfurized using heat and chemicals to restore their plasticity and are used as recycled rubber.
Desulfurization is time-consuming and uneconomical.

On the other hand, according to the invention of this application, molecules ground by a roll or a grinder have mutual affinity between newly generated molecules, so they have plasticity equivalent to that of current recycled rubber. Since the bond with raw rubber can be made stronger, the present method of manufacturing recycled rubber can be extremely simplified and the production cost can be reduced, which is extremely useful.

(2) After coarsely pulverizing the synthetic resin or recycled synthetic resin, the sludge is placed in a narrow gap with cooling water, and the grinding rotary plate is made of a hard, wear-resistant grinding rotary plate, such as in a stone mill. The molecular chains are broken off by grinding in a grinder made of In addition, the mixture is kneaded in a kneading machine such as a parallel roll to cause a mechanochemical reaction between the two, and further,
To this, a polyfunctional unsaturated ester, a crosslinking agent, a reinforcing agent, and other necessary compounding agents are added and mixed, and this mechanochemical reaction is heated to the softening temperature of the synthetic resin, and then heat molded. A new material is obtained by crosslinking polyfunctional unsaturated esters that have penetrated into rubber, synthetic resin, and compounding agents.

In this case as well, the quantitative ratio, action, effect, etc. are substantially the same as in the case of manufacturing a composite rubber product from the vulcanized rubber and raw rubber.

Claims (1)

[Scope of Claims] (!) After coarsely crushing vulcanized rubber such as waste tire treads and waste rubber toys, it is crushed together with cooling water into a single piece of crushed white that is polymerized with a narrow gap. The material is ground in a grinding machine consisting of a hard, wear-resistant, grinding rotary plate.
By tearing off the molecular chains and utilizing the newly generated affinity between the molecules, a mechanochemical reaction is caused between the same amount of naturally stranded natural rubber and synthetic raw rubber. A composite material characterized by adding a small amount of compounding agents such as a vulcanizing agent, a vulcanizing aid, and a reinforcing agent to this, kneading it, and then crosslinking these together by heating to form a new composite material. Method of manufacturing rubber products. (After crushing the 2+1 synthetic resin or recycled synthetic resin,
This, along with cooling water, is ground in a grinder consisting of a hard, wear-resistant grinding rotary plate, such as that used in an EL mill, which is placed overlappingly with a narrow gap, and the molecular chains are broken off. Utilizing the newly generated affinity between the molecules, add the same amount of natural or synthetic raw rubber that has been prepared separately and knead it on a kneading machine such as parallel rolls, and between the two, A mechanical reaction is caused, and furthermore,
The polyfunctional unsaturated ester, a crosslinking agent, a reinforcing agent, and other necessary compounding agents are added and mixed, and the resulting mechanochemical reaction is heated to the softening temperature of the synthetic resin and then heat-molded to form rubber. A method for producing a composite rubber product characterized by integrally crosslinking a polyfunctional unsaturated ester that has permeated a synthetic resin and a compounding agent to form a new material.