阅读说明：本技术 一种单次成型的橡胶发泡内胎制备工艺 (Preparation process of single-forming rubber foaming inner tube ) 是由 武国强 于 2019-11-02 设计创作，主要内容包括：本发明公开了一种单次成型的橡胶发泡内胎制备工艺,涉及发泡内胎制备技术领域,为解决现有技术中的发泡内外在制作生产的过程中,有些产品内部发泡孔过大,导致闭孔会变成联孔,以至于整体硬度和密度无法达标,使胎体部分发生塌陷的问题。步骤一：按照相应的比重配比准备好制作材料,天然橡胶80%-90%,高强度炭黑2.5%-3%,白炭黑3%-4%,增粘剂0.5%-1%,发泡剂3%-5%,促进剂2%-3%,防老剂2%-4%；步骤二：在制备前将白炭黑、炭黑以及发泡剂分别投入到碾磨设备中进行进一步的磨粉操作；步骤三：之后再将其他的液体配合剂进行脱水操作,尽量的降低试剂中的水分含量。(The invention discloses a preparation process of a single-forming rubber foaming inner tube, relates to the technical field of foaming inner tube preparation, and aims to solve the problems that in the production process of foaming inside and outside in the prior art, closed holes can be changed into connected holes due to overlarge foaming holes in some products, so that the integral hardness and density cannot reach the standard, and the collapse of a tire body part is caused. The method comprises the following steps: preparing a manufacturing material according to a corresponding proportion, wherein 80-90% of natural rubber, 2.5-3% of high-strength carbon black, 3-4% of white carbon black, 0.5-1% of tackifier, 3-5% of foaming agent, 2-3% of accelerator and 2-4% of anti-aging agent; step two: before preparation, the white carbon black, the carbon black and the foaming agent are respectively put into milling equipment for further milling operation; step three: then, the other liquid compounding agents are dehydrated to reduce the moisture content in the reagent as much as possible.)

1. A preparation process of a single-forming rubber foaming inner tube is characterized by comprising the following steps:

the method comprises the following steps: preparing a manufacturing material according to a corresponding proportion, wherein 80-90% of natural rubber, 2.5-3% of high-strength carbon black, 3-4% of white carbon black, 0.5-1% of tackifier, 3-5% of foaming agent, 2-3% of accelerator and 2-4% of anti-aging agent;

step two: before preparation, the white carbon black, the carbon black and the foaming agent are respectively put into milling equipment for further milling operation;

step three: then, dehydrating other liquid compounding agents to reduce the moisture content in the reagent as much as possible;

step four: putting 80-90% of natural rubber, 2.5-3% of high-strength carbon black, 3-4% of white carbon black, 0.5-1% of tackifier, 3-5% of foaming agent, 2-3% of accelerant and more than 2-4% of anti-aging agent into corresponding rubber mixing equipment for pressurizing and melting, and processing the components by the rubber mixing equipment to form liquid rubber compound;

step five: in order to avoid the existence of unreacted fixed rubber blocks in the rubber body, the liquid rubber compound needs to be filtered to obtain pure liquid rubber compound;

step six: adding the filtered rubber compound into extrusion equipment, wherein the self temperature of the rubber compound needs to be kept in the extrusion equipment to prevent solidification and forming;

step seven: preparing a die used for one-step molding, wherein the internal structure of the die is in an integral inner tube shape;

step eight: injecting the mixed rubber in the extrusion equipment into the die from the opening on the die, wherein a small amount of colloid is required to overflow from the opening of the die in the process;

step nine: taking the shaped inner tube out of the mold, removing the excess molding material on the surface of the inner tube, placing the inner tube into a vulcanizing machine, heating the inner tube to 130 ℃, and continuously heating for five minutes to finish primary pre-vulcanization shaping;

step ten: after the pre-vulcanization and shaping are finished, the temperature is raised to 145 ℃ through a vulcanizing machine, the heating is also continuously carried out for five minutes in the process, and the final vulcanization and shaping operation is finished to obtain the finished rubber foaming inner tube;

step eleven: corresponding inspection samples are randomly selected, cut open and detect the conditions of internal foaming and vulcanization shaping, problems are found to exist and need to be adjusted in time, and packaging and ex-warehouse can be carried out until the detection is qualified.

2. The process for preparing a single-shot rubber foam inner tube according to claim 1, wherein the process comprises the following steps: in the first step, the white carbon black can be prepared by mixing the pulverized coal gangue or fly ash and soda ash according to a weight ratio of 1: 50, uniformly mixing, smelting at high temperature, leaching with water, filtering to remove impurities, concentrating the filtrate to 45-46 Baume degrees to obtain sodium silicate, preparing the sodium silicate into a water glass solution, then leaching in 5-20% sulfuric acid, heating to 80 ℃, stirring, adjusting the pH value to 5-7, curing for 20 minutes, filtering, washing, drying and sorting to obtain the high-activity white carbon black with high purity.

3. The process for preparing a single-shot rubber foam inner tube according to claim 1, wherein the process comprises the following steps: and seventhly, the once-formed mold is integrated during casting, the mold replaces an inner tube mold during half-section casting, the colloid is injected in a spraying mode, a complete inner tube is directly obtained, and secondary welding is not needed.

4. The process for preparing a single-shot rubber foam inner tube according to claim 1, wherein the process comprises the following steps: in the step ten, the vulcanization temperature and the vulcanization time need to be accurately controlled during secondary vulcanization, whether each valve and each instrument have problems or not needs to be checked before vulcanization, and then the operation rules need to be strictly executed, so that the surface discoloration and edge cracking of the tire body caused by excessive vulcanization are avoided.

Technical Field

The invention relates to the technical field of foamed inner tube preparation, in particular to a preparation process of a single-forming rubber foamed inner tube.

Background

The inner tube is commonly called the lining tube. The annular elastic tube is used for keeping the internal pressure of the tire and is provided with a tire valve. The valve is used for inflating and keeping air at a certain pressure in the inner tire. The inner tube should have good air tightness, heat resistance, elasticity, aging resistance and small permanent deformation. The inner tube is an air-filled and vibration-damped air-bearing container, and is used as an auxiliary air-bearing container for the inner cavity of the tyre of truck, motorcycle, bicycle and rickshaw, and can be divided into a natural rubber inner tube and a butyl rubber inner tube according to the main materials contained in the inner tube, and a novel pure butyl rubber inner tube product is also provided, such as a 'Baolujie' pure butyl rubber inner tube produced by Zhengzhou Australian rubber. Butyl rubber inner tube product: the rubber tube is produced with butyl rubber and regenerated butyl rubber as main material, and through mixing, banburying, forming, sulfurizing and other steps.

However, in the existing foaming internal and external production process, some products have too large internal foaming pores, so that closed pores can become connected pores, the integral hardness and density cannot reach the standard, and the carcass part collapses; therefore, the existing requirements are not met, and a single-forming rubber foaming inner tube preparation process is provided for the requirement.

Disclosure of Invention

The invention aims to provide a preparation process of a single-forming rubber foaming inner tube, which aims to solve the problem that in the production process of foaming inside and outside in the background technology, closed holes can be changed into connected holes due to overlarge foaming holes in some products, so that the integral hardness and density cannot reach the standard, and the collapse of a tire body part is caused.

In order to achieve the purpose, the invention provides the following technical scheme: a preparation process of a single-forming rubber foaming inner tube comprises the following steps:

the method comprises the following steps: preparing a manufacturing material according to a corresponding proportion, wherein 80-90% of natural rubber, 2.5-3% of high-strength carbon black, 3-4% of white carbon black, 0.5-1% of tackifier, 3-5% of foaming agent, 2-3% of accelerator and 2-4% of anti-aging agent;

step two: before preparation, the white carbon black, the carbon black and the foaming agent are respectively put into milling equipment for further milling operation;

step three: then, dehydrating other liquid compounding agents to reduce the moisture content in the reagent as much as possible;

step four: putting 80-90% of natural rubber, 2.5-3% of high-strength carbon black, 3-4% of white carbon black, 0.5-1% of tackifier, 3-5% of foaming agent, 2-3% of accelerant and more than 2-4% of anti-aging agent into corresponding rubber mixing equipment for pressurizing and melting, and processing the components by the rubber mixing equipment to form liquid rubber compound;

step five: in order to avoid the existence of unreacted fixed rubber blocks in the rubber body, the liquid rubber compound needs to be filtered to obtain pure liquid rubber compound;

step six: adding the filtered rubber compound into extrusion equipment, wherein the self temperature of the rubber compound needs to be kept in the extrusion equipment to prevent solidification and forming;

step seven: preparing a die used for one-step molding, wherein the internal structure of the die is in an integral inner tube shape;

step eight: injecting the mixed rubber in the extrusion equipment into the die from the opening on the die, wherein a small amount of colloid is required to overflow from the opening of the die in the process;

step nine: taking the shaped inner tube out of the mold, removing the excess molding material on the surface of the inner tube, placing the inner tube into a vulcanizing machine, heating the inner tube to 130 ℃, and continuously heating for five minutes to finish primary pre-vulcanization shaping;

step ten: after the pre-vulcanization and shaping are finished, the temperature is raised to 145 ℃ through a vulcanizing machine, the heating is also continuously carried out for five minutes in the process, and the final vulcanization and shaping operation is finished to obtain the finished rubber foaming inner tube;

step eleven: corresponding inspection samples are randomly selected, cut open and detect the conditions of internal foaming and vulcanization shaping, problems are found to exist and need to be adjusted in time, and packaging and ex-warehouse can be carried out until the detection is qualified.

Preferably, in the step one, the white carbon black is prepared by mixing pulverized coal gangue or fly ash and soda ash in a weight ratio of 1: 50, uniformly mixing, smelting at high temperature, leaching with water, filtering to remove impurities, concentrating the filtrate to 45-46 Baume degrees to obtain sodium silicate, preparing the sodium silicate into a water glass solution, then leaching in 5-20% sulfuric acid, heating to 80 ℃, stirring, adjusting the pH value to 5-7, curing for 20 minutes, filtering, washing, drying and sorting to obtain the high-activity white carbon black with high purity.

Preferably, in the seventh step, the mold formed in one step is integrated during casting, instead of a tire tube mold in a half-section, and the colloid is injected in a spraying manner to directly obtain a complete tire tube without secondary welding.

Preferably, in the step ten, the vulcanization temperature and the vulcanization time need to be accurately controlled during the secondary vulcanization, whether each valve and each instrument have problems or not needs to be checked before vulcanization, and then, the operation rules need to be strictly executed, so that the surface discoloration and edge cracking of the tire body caused by over-vulcanization are avoided.

Compared with the prior art, the invention has the beneficial effects that:

1. before preparation, the white carbon black, the carbon black and the foaming agent are respectively put into a milling device for further milling operation, so that the foaming agent is prevented from agglomerating or excessively coarse particles, the overall quality requirement of a colloid is influenced, and meanwhile, the liquid compounding agent is also subjected to dehydration operation, so that the moisture content in the reagent is reduced as much as possible, and thus, the air or impurities in the rubber material can be reduced in the subsequent reaction, the rubber material is fully vulcanized, and the condition that foaming holes are too large is avoided;

2. the invention adopts the one-step molding die during the molding, the die is integrated during the casting, the die replaces the inner tube die during the half-section, the colloid is injected in a spraying mode to directly obtain the complete inner tube, the secondary welding is not needed, the whole manufacturing process is shortened on the premise of ensuring the quality of the tire body, thereby improving the production efficiency, a small amount of colloid needs to overflow from the open pore of the die in the process, the colloid amount in the die can reach the standard after the colloid overflows, and the condition of collapse caused by the insufficient colloid in the molding process is prevented.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments.

The embodiment provided by the invention comprises the following steps: a preparation process of a single-forming rubber foaming inner tube comprises the following steps:

the method comprises the following steps: preparing a manufacturing material according to a corresponding proportion, wherein 80-90% of natural rubber, 2.5-3% of high-strength carbon black, 3-4% of white carbon black, 0.5-1% of tackifier, 3-5% of foaming agent, 2-3% of accelerator and 2-4% of anti-aging agent;

step two: before preparation, the white carbon black, the carbon black and the foaming agent are respectively put into milling equipment for further milling operation, so that the foaming agent is prevented from agglomerating or being too coarse, and the overall quality requirement of the colloid is further influenced;

step three: then, other liquid compounding agents are dehydrated, so that the moisture content in the reagent is reduced as much as possible, air or impurities in the rubber material can be reduced in the subsequent reaction, the rubber material is fully vulcanized, and the condition that foaming holes are too large is avoided;

step four: putting 80-90% of natural rubber, 2.5-3% of high-strength carbon black, 3-4% of white carbon black, 0.5-1% of tackifier, 3-5% of foaming agent, 2-3% of accelerant and more than 2-4% of anti-aging agent into corresponding rubber mixing equipment for pressurizing and melting, and processing the components by the rubber mixing equipment to form liquid rubber compound;

step five: in order to avoid the existence of unreacted fixed rubber blocks in the rubber body, the liquid rubber compound needs to be filtered to obtain pure liquid rubber compound;

step six: adding the filtered rubber compound into extrusion equipment, wherein the self temperature of the rubber compound needs to be kept in the extrusion equipment to prevent solidification and forming;

step seven: preparing a die used for one-step molding, wherein the internal structure of the die is in an integral inner tube shape;

step eight: the rubber compound in the extrusion equipment is injected into the die from the opening on the die, a small amount of colloid is required to overflow from the opening of the die in the process, the colloid amount in the die can be ensured to reach the standard after the colloid overflows, and the situation of collapse caused by insufficient colloid in the forming process is prevented;

step nine: taking the shaped inner tube out of the mold, removing the excess molding material on the surface of the inner tube, placing the inner tube into a vulcanizing machine, heating the inner tube to 130 ℃, and continuously heating for five minutes to finish primary pre-vulcanization shaping;

step ten: after the pre-vulcanization and shaping are finished, the temperature is raised to 145 ℃ through a vulcanizing machine, the heating is also continuously carried out for five minutes in the process, and the final vulcanization and shaping operation is finished to obtain the finished rubber foaming inner tube;

step eleven: corresponding inspection samples are randomly selected, cut open and detect the conditions of internal foaming and vulcanization shaping, problems are found to exist and need to be adjusted in time, and packaging and ex-warehouse can be carried out until the detection is qualified.

Further, in the step one, the white carbon black can be prepared by mixing the pulverized coal gangue or fly ash and soda ash in a weight ratio of 1: 50, mixing uniformly, smelting at high temperature, leaching with water, filtering to remove impurities, concentrating the filtrate to 45-46 Baume degrees to obtain sodium silicate, preparing the sodium silicate into a water glass solution, then leaching in 5-20% sulfuric acid, heating to 80 ℃, stirring, adjusting the pH value to 5-7, curing for 20 minutes, filtering, washing, drying and sorting to obtain the high-purity high-activity white carbon black.

Further, in the seventh step, the once forming mould is as an organic whole when casting, has replaced the inner tube of a tyre mould when half section, injects the colloid through the mode of spraying, directly obtains complete inner tube of a tyre, need not to carry out secondary butt fusion, under the prerequisite of guaranteeing the matrix quality, shortens holistic preparation process to promote production efficiency.

Further, in the tenth step, the vulcanization temperature and the vulcanization time need to be accurately controlled during the secondary vulcanization, whether each valve and each instrument have problems or not needs to be checked before vulcanization, and then the operation rules need to be strictly executed, so that the surface discoloration and edge cracking of the tire body caused by excessive vulcanization are avoided.

The working principle is as follows: when in use, the preparation materials are prepared according to the corresponding proportion, 80-90 percent of natural rubber, 2.5-3 percent of high-strength carbon black, 3-4 percent of white carbon black, 0.5-1 percent of tackifier, 3-5 percent of foaming agent, 2-3 percent of accelerant and 2-4 percent of anti-aging agent are respectively put into grinding equipment for further grinding before preparation, the white carbon black, the carbon black and the foaming agent are respectively put into the grinding equipment for further grinding operation to avoid the foaming agent from agglomerating or too coarse particles so as to influence the integral quality requirement of colloid, then other liquid compounding agents are dehydrated to reduce the moisture content in the reagent as much as possible, so that air or impurities in the rubber material can be reduced in the subsequent reaction to be fully vulcanized, the condition that foaming holes are too large is avoided, 80-90 percent of natural rubber and 2.5-3 percent of high-strength carbon black are prepared, 3-4% of white carbon black, 0.5-1% of tackifier, 3-5% of foaming agent, 2-3% of accelerator and more than 2-4% of anti-aging agent are put into corresponding rubber mixing equipment for pressure melting, liquid rubber mixtures are formed after processing by the rubber mixing equipment, in order to avoid the existence of unreacted fixed rubber blocks in the rubber, the liquid rubber mixtures are required to be filtered to obtain pure liquid rubber mixtures, the filtered rubber mixtures are added into extrusion equipment, the self temperature of the rubber mixtures is required to be kept in the extrusion equipment to prevent solidification forming, then a die used for one-step forming is prepared, the internal structure of the die is in an integral inner tube shape, the rubber mixtures in the extrusion equipment are injected into the die from an opening on the die, and a small amount of rubber bodies are required to overflow from the opening of the die in the process, the colloid amount in the mold can be ensured to reach the standard after overflowing, the situation of collapse caused by insufficient colloid in the molding process is prevented, the mold formed in one step is integrated during casting, an inner tube mold in a half section is replaced, the colloid is injected in a spraying mode to directly obtain a complete inner tube without secondary fusion, the integral manufacturing process is shortened on the premise of ensuring the quality of a tire body, so that the production efficiency is improved, the molded inner tube is taken out from the mold, redundant molding materials on the surface of the inner tube are cut off after the molded inner tube is taken out, then the inner tube is placed in a vulcanizing machine and heated to 130 ℃ for five minutes, so that the primary presulfurization molding is completed, the temperature is raised to 145 ℃ through the vulcanizing machine after the presulfurization molding is completed, the process is also continuously heated for five minutes, and the final vulcanization molding operation is completed, and obtaining a finished rubber foaming inner tube, randomly selecting a corresponding inspection sample, splitting the inspection sample to detect the conditions of foaming inside and vulcanization shaping, finding out problems, adjusting in time, and packaging and delivering out of a warehouse until the detection is qualified.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.