阅读说明：本技术 一种轮胎及其制备工艺 (Tire and preparation process thereof ) 是由 冯学朋 于 2020-12-23 设计创作，主要内容包括：本发明公开了一种轮胎及其制备工艺,其中轮胎以重量份计,由如下组分制成的：高苯橡胶3-5份；再生胶48-52份；胶粉28-32份；芳烃油3-5份；硫磺0.5-0.8份；橡胶促进剂CZ 0.3-0.6份；橡胶促进剂TMTD 0.1-0.3份；硬脂酸0.4-0.7份；氧化锌0.5-0.9份。制备工艺包括冷成型、贴合充气加热融合硫化成整体的步骤。制备工艺缩短了生产流程,提高了生产效率。制备出的轮胎无线无钢丝结构,可以载重正常使用,使用寿命延长3-5年且无需内胎。(The invention discloses a tire and a preparation process thereof, wherein the tire is prepared from the following components in parts by weight: 3-5 parts of high benzene rubber; 48-52 parts of reclaimed rubber; 28-32 parts of rubber powder; 3-5 parts of aromatic oil; 0.5-0.8 part of sulfur; 0.3-0.6 part of rubber accelerator CZ; 0.1-0.3 part of rubber accelerator TMTD; 0.4-0.7 part of stearic acid; 0.5-0.9 part of zinc oxide. The preparation process comprises the steps of cold forming, fitting, inflating, heating, fusing and vulcanizing into a whole. The preparation process shortens the production flow and improves the production efficiency. The prepared tire has a wireless steel wire-free structure, can be normally used under load, has the service life prolonged by 3-5 years and does not need an inner tube.)

1. The tire is characterized by being prepared from the following components in parts by weight:

3-5 parts of high benzene rubber; 48-52 parts of reclaimed rubber; 28-32 parts of rubber powder; 3-5 parts of aromatic oil; 0.5-0.8 part of sulfur; 0.3-0.6 part of rubber accelerator CZ; 0.1-0.3 part of rubber accelerator TMTD; 0.4-0.7 part of stearic acid; 0.5-0.9 part of zinc oxide.

2. The tire according to claim 1, characterized by being made of, in parts by weight:

4 parts of high benzene rubber; 50 parts of reclaimed rubber; 30 parts of 40-mesh rubber powder; 4 parts of aromatic oil; 0.7 part of sulfur; 0.5 part of rubber accelerator CZ; 0.2 part of rubber accelerator TMTD; 0.6 part of stearic acid; 0.8 part of zinc oxide.

3. Process for the preparation of tyres according to claim 1 or 2, comprising the following steps:

s1, controlling a servo motor through a PLC (programmable logic controller), spirally pushing a screw of the servo motor, and putting required tire formula components into a bin of an internal mixer;

s2, starting the internal mixer, breaking rubber at a low speed of 10-20 revolutions per minute, fully stirring and mixing materials at a medium speed of 30-40 revolutions per minute, heating at a high speed of 50-60 revolutions per minute to 80-100 ℃, fusing, and discharging;

s3, transferring the mixture into a double-screw machine, cooling to 50-60 ℃, extruding into pieces, fixing the length, and weighing;

s4, extruding and cooling to 20-30 ℃ by using a hydraulic press, cooling and forming, and extruding a semi-finished product with the required external dimension of the product;

s5, placing the two semi-finished products into an upper die and a lower die, extruding by a vulcanizing machine, heating to 150-160 ℃, filling air pressure, and vulcanizing to form the product.

4. The tire manufacturing process according to claim 3, wherein in S2, the rubber mixing time of the internal mixer is controlled by PLC, the rotation speed of the internal mixer is controlled by a variable frequency motor system, the internal mixer is started at a low speed of 10-20 r/min and broken rubber is 60-120S, then the internal mixer is started at a medium speed of 30-40 r/min and fully stirred and mixed for 60-120S, and the temperature is raised to 80-100 ℃ at a high speed of 50-60 r/min and is fused for 60-120S.

5. The process for producing a tire according to claim 1, wherein the ingredients are automatically weighed and dispensed by an automatic weight scale molding machine and then spirally fed by a screw at S1.

Technical Field

The invention relates to the technical field of tires, in particular to a tire and a preparation process thereof.

Background

The tire is a common article in the life at present, and various vehicles, equipment and agricultural machinery are widely produced in China along with the improvement of the living standard of people at present. The production and consumption of tires as important components are particularly enormous. In particular, the waste tires are recycled, the production process is complicated, the labor and personnel investment is large, the equipment investment is large, the power consumption is large, the specific gravity and the index are low in the old formula, the addition of calcium powder into dust is large, the performance index of the product is reduced, the service life of the tires is short, the product qualification rate is low due to the complicated production process and personnel management, and the tire cost is increased.

For example, the original low-speed tires of the cycle tires mostly adopt waste tires which are ground and desulfurized to form reclaimed rubber as main raw materials.

The original formula of the tyre of the bicycle is as follows: 60 kg of reclaimed rubber, 25 kg of calcium carbonate powder, 4 kg of aromatic oil, 600 g of sulfur, 280 g of rubber accelerator CZ, 200 g of rubber accelerator DM, 600 g of stearic acid, 700 g of zinc oxide, 200 g of rubber antioxidant RD and 4010200 g of rubber antioxidant. Wherein the chemical name of the rubber accelerator DM is 2, 2' -dithiodibenzothiazyl.

The production process flow of the original cart tire comprises the following steps:

1. mixing rubber by an internal rubber mixer, adding reclaimed rubber, mixing oil and calcium powder, pressurizing and heating to 100 ℃, fusing and mixing for 6-8 minutes, thinning by an open mill, cooling and forming rubber sheets;

2. putting the rubber sheet into an open mill, rolling, heating to 90 ℃, putting the rubber sheet into a tread extruder, and cutting the rubber sheet into a tread according to the circumference of a width thickness curve of the tire;

3. extruding and molding a steel wire, namely extruding and coating the steel wire with glue according to the diameter size of the rim to form a fixed-size ring;

4. the method comprises the following steps of (1) rubberizing and fabric cutting of a cord thread, namely, flattening and tensioning the cord thread, feeding the cord thread into a four-roller calender, preheating, rolling and heating the cord thread to 90 ℃ through an open mill, and feeding the cord thread into the calender after rolling; uniformly coating the glue on the curtain line with the thickness of 0.6-1.2mm, cooling, feeding the glue into an isolation cloth liner, rolling, and cutting the required length, width and angle according to the tire model requirement by cutting the cloth;

5. forming, namely winding the cut cloth on a forming machine head in a crossed manner, hanging a steel wire ring at two ends, wrapping the steel wire ring by the reverse edges of the two layers of cloth, tensioning, then bonding the tire tread on the cloth by a 360-degree joint, pressing the tire tread on a pressing head, and rolling to form a fixed embryo;

6. vulcanizing, namely expanding and jacking the tire blank by using a blank filling machine; forming radian required by tire vulcanization, filling the water tire used for molding into a tire blank, putting the tire blank into a high-temperature vulcanizing machine, vulcanizing at high temperature of 150 ℃, filling high-pressure gas into the water tire to expand, pressing the mold into a tire with patterns, wherein the vulcanizing time is generally 10-60 minutes, hooking the water tire after the vulcanization is finished, molding the tire, and warehousing, selling and using after the tire is qualified through inspection.

The tire needs steel wire cords to form a framework to bear pressure, so that the normal use and running of the tire can be ensured. The steel wire has poor structural performance, needs complicated production process of wire layer steel wires to meet normal production and normal use, needs a large amount of labor force investment, has huge manufacturing cost and lower productivity.

Disclosure of Invention

In order to solve the technical problems, the invention aims to provide a tire and a preparation process thereof. The tire has a wireless steel wire-free structure, and the preparation process shortens the production flow and improves the production efficiency.

The adopted technical scheme is as follows:

the invention relates to a tire which is prepared from the following components in parts by weight:

3-5 parts of high benzene rubber; 48-52 parts of reclaimed rubber; 28-32 parts of rubber powder; 3-5 parts of aromatic oil; 0.5-0.8 part of sulfur; 0.3-0.6 part of rubber accelerator CZ; 0.1-0.3 part of rubber accelerator TMTD; 0.4-0.7 part of stearic acid; 0.5-0.9 part of zinc oxide.

Further, the tire is prepared from the following components in parts by weight:

4 parts of high benzene rubber; 50 parts of reclaimed rubber; 30 parts of 40-mesh rubber powder; 4 parts of aromatic oil; 0.7 part of sulfur; 0.5 part of rubber accelerator CZ; 0.2 part of rubber accelerator TMTD; 0.6 part of stearic acid; 0.8 part of zinc oxide.

In the formula, the high benzene rubber isStyrene Butadiene Rubber (SBR) having a styrene (St) content of more than 50 wt%; the rubber powder is a powdery rubber material obtained by crushing and processing waste rubber products; the reclaimed rubber is rubber which is processed by using vulcanized leftover materials in the production of rubber products as raw materials, has certain plasticity and can be reused. Molecular formula C of rubber accelerator CZ₁₃H₁₆N₂S₂The chemical name is N-cyclohexyl-2-benzothiazole sulfonamide; molecular formula C of rubber accelerator TMTD₆H₁₂N₂S₄The chemical name is N, N' -tetramethyl dithio-carbonyl amine.

The preparation process of the tire comprises the following steps:

s1, controlling a servo motor through a PLC (programmable logic controller), spirally pushing a screw of the servo motor, and putting required tire formula components into a bin of an internal mixer;

s2, starting the internal mixer, breaking rubber at a low speed of 10-20 revolutions per minute, fully stirring and mixing materials at a medium speed of 30-40 revolutions per minute, heating at a high speed of 50-60 revolutions per minute to 80-100 ℃, fusing, and discharging;

s3, transferring the mixture into a double-screw machine, cooling to 50-60 ℃, extruding into pieces, fixing the length, and weighing;

s4, extruding and cooling to 20-30 ℃ by using a hydraulic press, cooling and forming, and extruding a semi-finished product with the required external dimension of the product;

s5, placing the two semi-finished products into an upper die and a lower die, extruding by a vulcanizing machine, heating to 150-160 ℃, filling air pressure, and vulcanizing to form the product.

Further, in S2, the rubber mixing time of the internal mixer is controlled by a PLC, the rotating speed of the internal mixer is controlled by a variable frequency motor system, the internal mixer is started at a low speed of 10-20 r/min for rubber breaking for 60-120S, then at a medium speed of 30-40 r/min for materials, the materials are fully stirred and mixed for 60-120S, and at a high speed of 50-60 r/min, the temperature is raised to 80-100 ℃ for fusion for 60-120S.

Further, in S1, the ingredients are automatically weighed and dispensed by an automatic weight molding machine, and then are spirally pushed by a screw.

The invention has the beneficial effects that:

by combining the preparation process and the formula, the production efficiency is greatly improved, the performance index of the product is improved, the strength and the hardness of the tire are enhanced, the heavy working strength is reduced, the electric power resource is saved, the production cost is reduced, the production efficiency is improved, and the qualification rate is improved. The prepared tire has a wireless steel wire-free structure.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.

FIG. 1 is a photographic image of 1 semi-finished product of example 1.

FIG. 2 is a photograph of 2 semi-finished products of example 1 after being subjected to the step S5 to be molded into a tire.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only preferred embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example 1

The invention discloses a tire, which is prepared from the following components: 4 kg of high benzene rubber, 50 kg of reclaimed rubber, 30 kg of rubber powder of 40 meshes, 4 kg of aromatic oil, 700 g of sulfur, 500 g of rubber accelerator CZ, 200 g of rubber accelerator TMTD, 600 g of stearic acid and 800 g of zinc oxide.

The preparation process of the tire comprises the following steps:

s1, after automatic weighing and batching by an automatic weighing and forming machine, a servo motor is controlled by a PLC (programmable logic controller), a screw of the servo motor is pushed spirally, and required tire formula components are put into a bin of an internal mixer;

s2, rubber mixing time of the internal mixer is controlled through a PLC, the rotating speed of the internal mixer is controlled through a variable frequency motor system, the rotor speed is 10-60 rpm, and the range is adjustable. Starting the internal mixer, breaking rubber at low speed of 10-20 r/min for 60-120S, fully stirring and mixing materials at medium speed of 30-40 r/min for 60-120S, heating at high speed of 50-60 r/min to 80-100 ℃, fusing for 60-120S, and discharging;

s3, transferring the mixture into a double-screw machine, cooling to 50-60 ℃, extruding into pieces, fixing the length, and weighing;

s4, extruding and cooling to 20-30 ℃ by using a hydraulic press, cooling and forming, and extruding a semi-finished product with the required external dimension of the product;

s5, placing the two semi-finished products into an upper die and a lower die, extruding by a vulcanizing machine, heating to 150 ℃ and 160 ℃, filling air pressure, and vulcanizing to form a product, wherein the product is shown in the figure 1-figure 2.

Example 2

Referring to example 1, unlike example 1, a tire of this example was made of the following components:

3 kg of high benzene rubber, 48 kg of reclaimed rubber, 28 kg of 40-mesh rubber powder, 3 kg of aromatic oil, 500 g of sulfur, 300 g of rubber accelerator CZ, 100 g of rubber accelerator TMTD, 400 g of stearic acid and 500 g of zinc oxide.

Example 3

Referring to example 1, unlike example 1, a tire of this example was made of the following components:

5 kg of high benzene rubber, 52 kg of reclaimed rubber, 32 kg of 40-mesh rubber powder, 5 kg of aromatic oil, 800 g of sulfur, 600 g of rubber accelerator CZ, 300 g of rubber accelerator TMTD, 700 g of stearic acid and 900 g of zinc oxide.

Comparative example 1

A cycle tire is made from the following components: 60 kg of reclaimed rubber, 25 kg of calcium carbonate powder, 4 kg of aromatic oil, 600 g of sulfur, 280 g of rubber accelerator CZ, 200 g of rubber accelerator DM, 600 g of stearic acid, 700 g of zinc oxide, 200 g of rubber antioxidant RD and 4010200 g of rubber antioxidant.

The preparation process is referred to the background art, and is not described herein.

The tires prepared in example 1 were tested against the tires prepared in comparative example 1, and the test results are shown in table 1 below:

TABLE 1

Tyre for vehicle wheels	Comparative example 1	Example 1
			Tensile strength, Mpa	8	16
Elongation at break,%	200	260
			300% stress at definite elongation in MPa	5	10.5
Hardness (Shore type), A	56	85

Comparing the tire prepared in example 1 with the tire prepared for comparative example 1, it can be seen that:

the tire of the present invention: the strength (300% stress at definite elongation) is large, and the tensile strength is doubled. The tensile strength of the tire is multiplied, the hardness is improved, the tire can be normally used under a load without steel wires, the service life is prolonged by 3-5 years, and an inner tube is not needed.

The above-listed detailed description is only a specific description of a possible embodiment of the present invention, and they are not intended to limit the scope of the present invention, and equivalent embodiments or modifications made without departing from the technical spirit of the present invention should be included in the scope of the present invention.