阅读说明：本技术 一种用于轮胎防刺穿的气密胶及其制备方法 (Air-tight glue for preventing tire from puncturing and preparation method thereof ) 是由 卢德政 卢念成 张大海 卢强 尹作鹏 尹翔 于 2020-05-29 设计创作，主要内容包括：本发明公开一种用于轮胎防刺穿的气密胶及其制备方法,属于轮胎制造与修复技术领域。本发明气密胶是以氯丁橡胶、天然橡胶、竹粉、增粘树脂RX-80、高氨天然乳胶、KN4006环烷基橡胶油、松香、氧化锌、改性菠萝叶纤维、促进剂DETU、硅烷偶联剂Si-563、分散剂WB212、硬脂酸SA、多苯基多亚甲基多异氰酸酯、防老剂RD、过硫酸氢钠、联苯氨黄G为原料制备而成。本发明采用高氨乳胶与气密性良好的氯丁橡胶和加工性能良好的天然橡胶作为混合体系,胶体性能之间相互补充,同时加入改性菠萝叶纤维改善了成型时胶层与子口胶料之间的粘性,提高了胶料的拉伸和撕裂强力,各配合剂相互配合,共同提升了产品的黏结和修复性能。(The invention discloses an airtight rubber for preventing puncture of a tire and a preparation method thereof, and belongs to the technical field of tire manufacturing and repair. The airtight rubber is prepared from chloroprene rubber, natural rubber, bamboo powder, tackifying resin RX-80, high-ammonia natural latex, KN4006 naphthenic base rubber oil, rosin, zinc oxide, modified pineapple leaf fiber, an accelerator DETU, a silane coupling agent Si-563, a dispersing agent WB212, stearic acid SA, polyphenyl polymethylene polyisocyanate, an anti-aging agent RD, sodium hydrogen persulfate and benzidine yellow G. According to the invention, the high-ammonia latex, the chloroprene rubber with good air tightness and the natural rubber with good processing performance are used as a mixed system, the colloid performance is mutually complemented, meanwhile, the modified pineapple leaf fiber is added, the viscosity between an adhesive layer and a seam allowance adhesive material during molding is improved, the tensile and tearing strength of the adhesive material is improved, and the compounding agents are mutually matched, so that the bonding and repairing performance of the product is jointly improved.)

1. The air-tight glue for preventing puncture of the tire is characterized by comprising the following raw materials in parts by weight: 50-70 parts of chloroprene rubber, 16-22 parts of natural rubber, 25-33 parts of bamboo powder, 2-18 parts of tackifying resin RX-8012, 30-35 parts of high-ammonia natural latex, 6-9 parts of naphthenic rubber oil, 6-8 parts of rosin, 2-4 parts of zinc oxide, 2-3 parts of modified pineapple leaf fiber, 1.3-1.8 parts of accelerator DETU, 2.2 parts of silane coupling agent Si-5631.7, 2121.5-3 parts of dispersant WB, 1.2-1.4 parts of stearic acid SA, 26-2 parts of polyphenyl polymethylene polyisocyanate PAPI1, 1-2 parts of anti-aging agent RD, 1-2 parts of sodium hydrogen persulfate and 0.01-0.05 part of benzidine yellow G.

2. The airtight glue for tire puncture-proof as claimed in claim 1, wherein said modified pineapple leaf fiber is prepared by the following method:

(1) pretreatment: cutting pineapple leaf fibers into small sections with the length of 1-3cm, soaking the small sections in a benzene-absolute ethyl alcohol mixed solution with the volume ratio of 1:1 for 24 hours, taking out the small sections, airing the small sections, respectively washing the small sections with absolute ethyl alcohol and distilled water, and then drying the small sections in a shade; soaking the fiber in 15% sodium hydroxide solution for 2h, wherein the weight ratio of the fiber to the sodium hydroxide solution is 1:20, and continuously stirring; after soaking, washing the fibers to be neutral by using distilled water, airing at room temperature in a ventilating way, grinding the fibers by using a plant sample grinder until the particle size is less than 1 mu m, and sealing for later use to obtain the pretreated pineapple leaf fibers;

(2) taking deionized water, a silane coupling agent Si-563 and absolute ethyl alcohol according to the mass ratio of 4-6:1.7-2.2:75-101, adding the silane coupling agent Si-563 into the deionized water, stirring until the silane coupling agent Si-563 is completely dissolved, adding the absolute ethyl alcohol, adding the pretreated pineapple leaf fiber obtained in the step (1), soaking for 24-48h, and placing in a drying oven for drying for more than 24h to obtain the modified pineapple leaf fiber.

3. The airtight rubber for tire puncture-proof according to claim 1, wherein said high ammonia natural rubber latex is natural rubber latex with ammonia content greater than 1.2%.

4. The airtight rubber for tire puncture prevention according to claim 1, wherein said cycloalkyl rubber oil is KN4006 cycloalkyl rubber oil.

5. A method for preparing the airtight glue for tyre puncture-proof according to any one of claims 1-4, characterized by comprising the following preparation steps:

(1) drying the glue: respectively baking the natural rubber and the chlorobutyl rubber at 53 ℃ and 40 ℃ for 35 hours and 5 hours;

(2) cutting the glue: respectively cutting the natural rubber and the chlorobutyl rubber into small pieces by a rubber cutter;

(3) gel breaking: controlling the roll spacing of the rubber crusher to be 2-3mm, controlling the temperature of a roller to be 40 ℃, and respectively placing the natural rubber and the chlorobutyl rubber into the rubber crusher for crushing;

(4) plasticating: adopting a thin-pass plastication method, controlling the rotating speed of a roller plasticated by an open mill to be 17r/min, controlling the speed ratio to be 1.2, controlling the roller spacing to be 0.5mm and controlling the temperature to be 42-45 ℃; adding the rubber sheet obtained by breaking the rubber in the step (3) to a roller at one side close to a large roller, enabling the rubber sheet to pass through a roller gap, enabling the rubber sheet to directly fall into a receiving tray without wrapping the roller, twisting the rubber sheet in the tray by 90 degrees when no rubber material is accumulated on the roller, putting the rubber sheet into the roller gap again, and repeatedly rolling for 25 minutes;

(5) and (3) smashing the rubber: after rolling is finished, adjusting the roller distance to 1mm, wrapping the roller with rubber materials, cutting left and right by using a cutting knife, so that the rubber materials fall into a rubber receiving disc, and stopping cutting until no rubber materials are accumulated; adjusting the distance between the rollers to 1.5mm, cutting off the slices, and standing at room temperature for 30 hours;

(6) wrapping a roller: putting the plasticated rubber obtained in the step (5) between two rollers, adjusting the distance between the rollers to uniformly and continuously wrap the plasticated rubber on the front roller to form a uniform, smooth and seamless roller wrapping rubber layer, taking down the rubber layer, and putting the rubber layer between two roller gaps;

(7) preparing materials: weighing chloroprene rubber, natural rubber, an accelerator DETU, an anti-aging agent RD, stearic acid SA, zinc oxide, bamboo powder, a silane coupling agent Si-563, modified pineapple leaf fiber, sodium hydrogen persulfate, a dispersant WB212, naphthenic rubber oil and polyphenyl polymethylene polyisocyanate PAPI in parts by weight, and taking the components as compounding agents for later use;

(8) eating the powder: according to the technical scheme, the preparation method comprises the following steps of sequentially adding compounding agents into chloroprene rubber, natural rubber, an accelerator DETU, an anti-aging agent RD, stearic acid, zinc oxide, bamboo powder, a silane coupling agent Si-563, modified pineapple leaf fibers, sodium hydrogen persulfate, a dispersing agent WB212, KN4006 naphthenic base rubber oil and polyphenyl polymethylene polyisocyanate PAPI for mixing, wherein 2 times of glue smashing operation is needed after adding one compounding agent, and then adding rosin and benzidine yellow G for mixing; the rotating speed of a mixing roller of the open mill is controlled to be 16r/min, the speed ratio is controlled to be 1, the temperature of a front roller is adjusted to be 95 ℃, the temperature of a rear roller is controlled to be 92 ℃, and the mixing time is controlled to be 30 minutes;

(9) cutting and turning: adding tackifying resin RX and high-ammonia natural latex, adjusting the distance between rollers to 2mm, continuously and crossly cutting the rubber on the coating rubber by using a cutting knife, changing the shearing direction of the rubber, replacing and stacking the rubber, cutting the rubber for 9 times, and controlling the mastication time within 6 minutes;

(10) and (3) placing the following pieces: and (4) discharging the rubber, standing the roller rubber compound, and cooling for 20-24 hours to obtain a finished product.

Technical Field

The invention belongs to the technical field of tire manufacturing and repair, and particularly relates to an air-tight glue for preventing puncture of a tire and a preparation method thereof.

Background

With the increase of the economic strength of China, the automobile industry develops rapidly, automobile transportation becomes an indispensable important tool, and the industrial development, technical innovation and progress of the tire industry are directly promoted. Tires are highly regarded by various countries as important support and strategic resources for transportation. The leakage of the tire has great influence on national economic development and personal safety of people, and the tire repair operation is required. The puncture-proof airtight rubber for the tire plays a crucial role.

The tire is formed by taking rubber as a base material and combining a plurality of vulcanized rubbers in a shaping way. Taking radial tires as an example, tubeless tires are a trend in the development of the tire industry. The inner part of the tire is provided with a layer of airtight layer rubber which is an air barrier, so that the tire cord fabric can be protected, air can be prevented from seeping out of the tire due to differential pressure, and the tire has the functions of pressure maintaining and sealing. Generally, the repair of the tire is mainly performed. The traditional repair method mainly comprises four methods: gluing a rubber strip, cold patch, mushroom nail and fire patch. But all have obvious defects that the adhesive strips are easy to leak air when being bonded at the broken openings; the cold patch is easy to age and fall off; the mushroom nail repairing crevasses are limited to an angle smaller than 15 degrees; the fire compensation is the most thorough and low in requirement, but the method needs professional skill and formal equipment. Careless handling can cause permanent damage to the tire.

The use of the tire repair liquid is also a common method, the tire repair liquid is a chemical material containing various macromolecules, and is widely applied to various rubber tires of electric vehicles, motorcycles and small and medium-sized automobiles, the traditional tire repair rubber contains copper sulfate, is blue, has certain heavy metal toxicity and corrosivity, and the tire repair effect needs to be improved.

Disclosure of Invention

In order to solve the problems in the prior art, the invention provides the airtight glue for preventing the puncture of the tire and the preparation method thereof. The technical scheme adopted by the invention is as follows:

the airtight rubber for preventing puncture of the tire comprises the following raw materials in parts by weight: 50-70 parts of chloroprene rubber, 16-22 parts of natural rubber, 25-33 parts of bamboo powder, 2-18 parts of tackifying resin RX-8012, 30-35 parts of high-ammonia natural latex, 6-9 parts of KN4006 naphthenic rubber oil, 6-8 parts of rosin, 2-4 parts of zinc oxide, 2-3 parts of modified pineapple leaf fiber, 1.3-1.8 parts of accelerator DETU, 2.2 parts of silane coupling agent Si-5631.7, 3-3 parts of dispersant WB 2121.5, 1.2-1.4 parts of stearic acid SA, 2-2 parts of polyphenyl polymethylene polyisocyanate PAPI1, 1-2 parts of antioxidant RD, 1-2 parts of sodium hydrogen persulfate and 0.01-0.05 part of biphenyl ammonia yellow G.

The accelerant DETU is diethyl thiourea;

the modified pineapple leaf fiber is prepared by the following method:

(1) pretreatment: cutting pineapple leaf fibers into small sections with the length of 1-3cm, soaking the small sections in a benzene-absolute ethyl alcohol mixed solution with the volume ratio of 1:1 for 24 hours, taking out the small sections, airing the small sections, respectively washing the small sections with absolute ethyl alcohol and distilled water, and then drying the small sections in a shade; soaking the fiber in 15% sodium hydroxide solution for 2h, wherein the weight ratio of the fiber to the sodium hydroxide solution is 1:20, and continuously stirring; after soaking, washing the fibers to be neutral by using distilled water, airing at room temperature in a ventilating way, grinding the fibers by using a plant sample grinder until the particle size is less than 1 mu m, and sealing for later use to obtain the pretreated pineapple leaf fibers;

(2) taking deionized water, a silane coupling agent Si-563 and absolute ethyl alcohol according to the mass ratio of 4-6:1.7-2.2:75-101, adding the silane coupling agent Si-563 into the deionized water, stirring until the silane coupling agent Si-563 is completely dissolved, adding the absolute ethyl alcohol, adding the pretreated pineapple leaf fiber obtained in the step (1), soaking for 24-48h, and placing in a drying oven for drying for more than 24h to obtain the modified pineapple leaf fiber.

The high-ammonia natural latex is natural latex with ammonia content more than 1.2 percent.

A preparation method of airtight rubber for preventing puncture of tires comprises the following preparation steps:

(1) drying the glue: respectively baking the natural rubber and the chlorobutyl rubber at 53 ℃ and 40 ℃ for 35 hours and 5 hours; in the process of drying the rubber, the temperature cannot exceed 60 ℃, otherwise, the physical and mechanical properties of the rubber can be influenced;

(2) cutting the glue: respectively cutting the natural rubber and the chlorobutyl rubber into small pieces by a rubber cutter; the weight of each piece of natural rubber is controlled to be 1-2 g, and the weight of each piece of chloroprene rubber is less than 1 g. The larger the rubber block is, the more difficult the rubber is to break, and the more energy is consumed;

(3) gel breaking: controlling the roll spacing of the rubber crusher to be 2-3mm, controlling the temperature of a roller to be 40 ℃, and respectively placing the natural rubber and the chlorobutyl rubber into the rubber crusher for crushing;

(4) plasticating: adopting a thin-pass plastication method, controlling the rotating speed of a roller plasticated by an open mill to be 17r/min, controlling the speed ratio to be 1.2, controlling the roller spacing to be 0.5mm and controlling the temperature to be 42-45 ℃; adding the rubber sheet obtained by breaking the rubber in the step (3) to a roller at one side close to a large roller, enabling the rubber sheet to pass through a roller gap, enabling the rubber sheet to directly fall into a receiving tray without wrapping the roller, twisting the rubber sheet in the tray by 90 degrees when no rubber material is accumulated on the roller, putting the rubber sheet into the roller gap again, and repeatedly rolling for 25 minutes;

(5) and (3) smashing the rubber: after rolling is finished, adjusting the roller distance to 1mm, wrapping the roller with rubber materials, cutting left and right by using a cutting knife, so that the rubber materials fall into a rubber receiving disc, and stopping cutting until no rubber materials are accumulated; adjusting the distance between the rollers to 1.5mm, cutting off the slices, and standing at room temperature for 30 hours;

(6) wrapping a roller: putting the plasticated rubber obtained in the step (5) between two rollers, adjusting the distance between the rollers to uniformly and continuously wrap the plasticated rubber on the front roller to form a uniform, smooth and seamless roller wrapping rubber layer, taking down the rubber layer, and putting the rubber layer between two roller gaps;

(7) preparing materials: weighing chloroprene rubber, natural rubber, an accelerator DETU, an anti-aging agent RD, stearic acid SA, zinc oxide, bamboo powder, a silane coupling agent Si-563, modified pineapple leaf fibers, sodium hydrogen persulfate, a dispersing agent WB212, naphthenic rubber oil and polyphenyl polymethylene polyisocyanate PAPI in parts by weight, and taking the chloroprene rubber, the natural rubber, the accelerator DETU, the anti-aging agent RD, the stearic acid SA, the zinc oxide, the bamboo powder, the silane coupling agent Si-563, the modified pineapple leaf fibers;

(8) eating the powder: according to the technical scheme, the preparation method comprises the steps of sequentially adding compounding agents into chloroprene rubber, natural rubber, an accelerator DETU, an anti-aging agent RD, stearic acid, zinc oxide, bamboo powder, a silane coupling agent Si-563, modified pineapple leaf fibers, sodium hydrogen persulfate, a dispersing agent WB212, KN4006 naphthenic base rubber oil and polyphenyl polymethylene polyisocyanate PAPI for mixing, wherein 2 times of glue smashing operation is needed after adding one compounding agent each time so that the compounding agents are distributed more uniformly, and then adding rosin and benzidine yellow G;

at this moment, the distance between the rollers should be properly widened, a certain amount of glue accumulation is maintained above the roller gap, the glue layer of the rollers is continuous, and after powder eating is finished, 2 times of glue smashing operation is carried out, so that the compounding ingredients are distributed in the glue material more uniformly.

The rotating speed of a mixing roller of the open mill is controlled to be 16r/min, the speed ratio is controlled to be 1, the temperature of a front roller is adjusted to be 95 ℃, the temperature of a rear roller is controlled to be 92 ℃, and the mixing time is controlled to be 30 minutes;

(9) cutting and turning: adding tackifying resin and natural latex, adjusting the distance between rollers to 2mm, using a cutting knife to cross and continuously cut rubber on the coating rubber, changing the shearing direction of the rubber, replacing and stacking the rubber, cutting the rubber for 9 times, and controlling the mastication time within 6 minutes;

(10) and (3) placing the following pieces: and (4) discharging the rubber, standing the roller rubber compound, and cooling for 20-24 hours to obtain a finished product.

The raw materials used in the present invention are commercially available.

The airtight glue of the invention has the following use principle:

when the automobile tire is punctured, the product is coated at the inner wall of the tire, and the product can be blocked and cover the lacerated opening under the action of the pressure in the tire so as to achieve the aim of repairing; or the product is uniformly sprayed on the inner wall of the tire to form a thin layer of 2-4mm, when a hard object pierces the tire, the hard object is wrapped by the colloid, and when the hard object is pulled out, the colloid is restored and clings to the inner surface of the tire under the action of the elasticity of the hard object and the pressure in the tire, so that the aims of puncture and air leakage prevention are fulfilled. Meanwhile, the danger of sudden tire burst caused by air leakage in the driving process of the automobile is also avoided.

Has the advantages that: the airtight rubber adopts chloroprene rubber with excellent air tightness as a main material, natural rubber with good processing performance, high elasticity and good bonding film forming performance, a rubber film is supplemented by high-flexibility and high-ammonia natural latex, bamboo powder is used as a reinforcing filler to improve the physical and mechanical properties of the rubber material, rosin is used to bond butyl rubber and the natural rubber well, so that the combined rubber has good viscoelasticity, and meanwhile, the added modified pineapple leaf fiber improves the adhesion between the rubber layer and the seam rubber material during molding and improves the tensile and tearing strength of the rubber material. Sodium bisulfate can initiate pineapple leaf fiber grafting and increase the degree of fiber grafting when being added in the process of mixing sizing materials. Meanwhile, the surface affinity of the pineapple leaf fibers is improved, and the affinity of rubber and the pineapple leaf fibers is improved, so that the tearing strength of the pineapple leaf fibers is improved. In the tire repair process, the grafted pineapple leaf fibers form a framework at the crevasses, and the colloid component is filled on the framework to be firmly adsorbed at the crevasses. Enhancing its seal retention properties.

On the other hand, the puncture-proof airtight glue avoids the use of heavy metal components and eliminates the toxic action and the corrosion action of heavy metal elements. The addition of a proper amount of strong base in the repair glue improves the stability of a latex system and is beneficial to preservation.

In conclusion, the high-ammonia latex, the chloroprene rubber with good air tightness and the natural rubber with good processing performance are adopted as a mixed system, the colloid performance is mutually supplemented, and simultaneously, the high-ammonia latex and the chloroprene rubber are mutually matched with each compounding agent to cooperatively play a role, so that the bonding performance of the product is improved, and the repairing performance of the product is improved.

Detailed Description

The technical solution of the present invention is further described below with reference to specific embodiments, but is not limited thereto.