阅读说明：本技术 一种无锑耐磨pvg阻燃输送带覆盖胶及其制备方法 (Antimony-free wear-resistant PVG flame-retardant conveyor belt cover rubber and preparation method thereof ) 是由 杜占虎 李永亮 王培� 于 2020-05-13 设计创作，主要内容包括：本发明公开了一种无锑耐磨PVG阻燃输送带覆盖胶及其制备方法,由以下材料制成：按重量比计算,40-50丁腈橡胶、20-30氯化聚乙烯、20-30高乙烯基聚丁二烯橡胶、35中超炭黑、10-15三芳基磷酸酯、4-6氧化锌、1-2硫化促进剂J-75、2-3硫磺、5-10溴化环氧树脂、3-10季戊四醇、10-20膨胀性阻燃剂、2-3双-(3-三乙氧基硅烷丙基)四硫化物偶联剂、1-3MB防老剂、10-15十溴二苯醚和10-20纳米氢氧化铝。使用本发明制成的覆盖层不含氧化锑,对人体没有损伤；阻燃效果好；粘合力强,动态疲劳性能良好,不脱层,不脱胶；耐侯性、耐寒性能优异,适应温度范围宽；耐磨性优异。(The invention discloses antimony-free wear-resistant PVG flame-retardant conveyor belt cover rubber and a preparation method thereof, wherein the antimony-free wear-resistant PVG flame-retardant conveyor belt cover rubber is prepared from the following materials: according to the weight ratio, 40-50 parts of nitrile rubber, 20-30 parts of chlorinated polyethylene, 20-30 parts of high vinyl polybutadiene rubber, 35 parts of medium carbon black, 10-15 parts of triaryl phosphate, 4-6 parts of zinc oxide, 1-2 parts of vulcanization accelerator J-75, 2-3 parts of sulfur, 5-10 parts of brominated epoxy resin, 3-10 parts of pentaerythritol, 10-20 parts of intumescent flame retardant, 2-3 parts of bis- (3-triethoxysilylpropyl) tetrasulfide coupling agent, 1-3MB parts of anti-aging agent, 10-15 parts of decabromodiphenyl ether and 10-20 parts of nano aluminum hydroxide. The covering layer prepared by the invention does not contain antimony oxide, and does not damage human bodies; the flame retardant effect is good; strong adhesive force, good dynamic fatigue performance, no delamination and no degumming; the weather resistance and cold resistance are excellent, and the adaptive temperature range is wide; the wear resistance is excellent.)

1. The utility model provides a fire-retardant conveyer belt cover of antimony-free wear-resisting PVG glues which characterized in that: it is made of the following materials: 40-50 parts of nitrile rubber, 20-30 parts of chlorinated polyethylene, 20-30 parts of high vinyl polybutadiene rubber, 35 parts of medium carbon black, 10-15 parts of triaryl phosphate, 4-6 parts of zinc oxide, 1-2 parts of vulcanization accelerator J-75, 2-3 parts of sulfur, 5-10 parts of brominated epoxy resin, 3-10 parts of pentaerythritol, 10-20 parts of intumescent flame retardant, 2-3 parts of bis- (3-triethoxysilylpropyl) tetrasulfide agent, 1-3 parts of MB anti-aging agent, 10-15 parts of decabromodiphenyl ether and 10-20 parts of nano aluminum hydroxide.

2. The preparation method of the antimony-free wear-resistant PVG flame-retardant conveyor belt cover rubber of claim 1, which is characterized by comprising the following steps of: which comprises the following steps:

(1) preparing master batch: mixing the nitrile rubber, the brominated epoxy resin and the chlorinated polyethylene into master batch by using an internal mixer; the pressure of an internal mixer is 0.3MPa, the rotating speed is 33-35r/min, the mixing time is 5-6 min, the rubber discharging temperature of the master batch is 110-115 ℃, and the master batch is parked for 8 hours;

(2) preparing a first-stage rubber, and mixing conditions are as follows: the pressure of an internal mixer is 0.3MPa, the rotating speed is 30-35r/min, and the masterbatch and the high vinyl polybutadiene rubber are added into the internal mixer; then adding the zinc oxide, the vulcanization accelerator J-75, the bis- (3-triethoxysilylpropyl) tetrasulfide coupling agent and the MB anti-aging agent, and then adding decabromodiphenyl ether, pentaerythritol, the intumescent flame retardant and the nano aluminum hydroxide; adding medium-grade super-carbon black, finally adding flame retardant triaryl phosphate to prepare a first-stage adhesive, discharging the adhesive when the temperature is reduced to 140-145 ℃, and standing the discharged first-stage adhesive for 8 hours;

(3) and (2) second-stage mixing, namely continuously adding the first-stage rubber standing for 8 hours into an internal mixer, adding the sulfur, mixing for 30-40min at the temperature of 155-158 ℃ and the unit surface pressure of 3.0MPa, cooling for 2-3min at the temperature of below 90 ℃ and the rotating speed of 20r/min, discharging the rubber after cooling to 40 ℃, and preparing the flame-retardant covering rubber sheet by calender equipment.

Technical Field

The invention relates to antimony-free wear-resistant PVG flame-retardant conveyor belt cover rubber and a preparation method thereof.

Background

The PVG flame-retardant conveyor belt is a rubber surface whole core flame-retardant conveyor belt used in coal mine. The adhesive force of an adhesive interface between covering glue and a framework material used by the conventional PVG conveyer belt is too low, and the adhesive interface is easy to crack under the action of dynamic deflection only under the physical action, so that the conveyer belt has short service life and higher cost. The covering glue contains antimony oxide, which is a flame retardant with high efficiency and wide application, but the antimony oxide has great harm to human bodies and irritation to eyes and skin; after being ingested, the oral liquid causes gastrointestinal irritation, nausea, vomit, oral cavity and throat burn and central nervous system inhibition, and antimony oxide used in the production process has great harm to the health of workers. The covering layer formed by the covering glue has poor wear resistance and short service life. The glass transition temperature of the whole core flame-retardant conveyor belt for coal mines is higher, the low-temperature performance is poor, the grooving performance is poor when the conveyor belt is used in winter in the north, and the belt body is easy to break.

Disclosure of Invention

The invention aims to solve the problems in the prior art and provides the antimony-free wear-resistant PVG flame-retardant conveyor belt covering rubber, and a covering layer made of the covering rubber does not contain antimony oxide and is not harmful to human bodies; the flame retardant effect is good; strong adhesive force, good dynamic fatigue performance, no delamination and no degumming; the weather resistance and cold resistance are excellent, and the adaptive temperature range is wide; the wear resistance is excellent.

The technical scheme of the invention is as follows: the antimony-free wear-resistant PVG flame-retardant conveyor belt covering rubber is prepared from the following materials: 40-50 parts of nitrile rubber, 20-30 parts of chlorinated polyethylene, 20-30 parts of high vinyl polybutadiene rubber, 35 parts of medium carbon black, 10-15 parts of triaryl phosphate, 4-6 parts of zinc oxide, 1-2 parts of vulcanization accelerator J-75, 2-3 parts of sulfur, 5-10 parts of brominated epoxy resin, 3-10 parts of pentaerythritol, 10-20 parts of intumescent flame retardant, 2-3 parts of bis- (3-triethoxysilylpropyl) tetrasulfide agent, 1-3 parts of MB anti-aging agent, 10-15 parts of decabromodiphenyl ether and 10-20 parts of nano aluminum hydroxide.

The preparation method of the antimony-free wear-resistant PVG flame-retardant conveyor belt cover rubber comprises the following steps:

(1) preparing master batch: mixing the nitrile rubber, the brominated epoxy resin and the chlorinated polyethylene into master batch by using an internal mixer; the pressure of an internal mixer is 0.3MPa, the rotating speed is 33-35r/min, the mixing time is 5-6 min, the rubber discharging temperature of the master batch is 110-115 ℃, and the master batch is parked for 8 hours;

(2) preparing a first-stage rubber, and mixing conditions are as follows: the pressure of an internal mixer is 0.3MPa, the rotating speed is 30-35r/min, and the masterbatch and the high vinyl polybutadiene rubber are added into the internal mixer; then adding the zinc oxide, the vulcanization accelerator J-75, the bis- (3-triethoxysilylpropyl) tetrasulfide coupling agent and the MB anti-aging agent, and then adding decabromodiphenyl ether, pentaerythritol, the intumescent flame retardant and the nano aluminum hydroxide; adding medium-grade super-carbon black, finally adding flame retardant triaryl phosphate to prepare a first-stage adhesive, discharging the adhesive when the temperature is reduced to 140-145 ℃, and standing the discharged first-stage adhesive for 8 hours;

(3) and (2) second-stage mixing, namely continuously adding the first-stage rubber standing for 8 hours into an internal mixer, adding the sulfur, mixing for 30-40min at the temperature of 155-158 ℃ and the unit surface pressure of 3.0MPa, cooling for 2-3min at the temperature of below 90 ℃ and the rotating speed of 20r/min, discharging the rubber after cooling to 40 ℃, and preparing the flame-retardant covering rubber sheet by calender equipment.

The invention adopts brominated epoxy resin as tackifier, so that the adhesion between the covering adhesive and the belt core reaches more than 15N/mm, the dynamic fatigue performance is good, and the belt core does not delaminate or degum. The nitrile rubber has excellent weather resistance and cold resistance, can be used within the temperature range of minus 35 ℃ to minus 70 ℃, and has strong high temperature and low temperature resistance. The joint can adopt a vulcanization method, and the strength of the joint is kept above 90%. The wear-resistant rubber belt is treated by a special process by adopting a special wear-resistant system of a bis- (3-triethoxysilylpropyl) tetrasulfide coupling agent and medium-super carbon black, so that the wear resistance of the belt is greatly enhanced, the wear resistance is far higher than the standard requirement, the wear resistance is good in the temperature range of minus 35 ℃ to minus 70 ℃, and the service life of the belt is prolonged. The invention does not contain antimony oxide, does not damage human bodies in the manufacturing process, has excellent flame retardant property, can be extinguished after leaving fire, does not have sparks and does not re-fire, and the friction temperature of the roller is below 270 ℃.

Detailed Description

The invention is further described with reference to specific examples.