阅读说明：本技术 一种基于废弃pp塑料的回收加工工艺 (Recycling processing technology based on waste PP plastic ) 是由 朱保义 沈岑宽 卢山龙 任永刚 陈华勇 胡磊 吴国庆 王武钧 于 2019-09-17 设计创作，主要内容包括：本发明公开了一种基于废弃PP塑料的回收加工工艺,具体加工过程如下：将废弃的PP塑料加入粉碎机中进行粉碎造粒；将PP塑料母粒和顺丁橡胶同时加入塑炼机中,熔融塑炼后向其中加入抗氧交联剂和过硫酸钠,塑炼后加入增塑剂、纳米二氧化硅、石英粉和炭黑,继续混炼后进行排胶；将胶料熔融后涂布在石棉布的上下表面,然后进行冷却固化,得到防水片层将防水片层的底面涂布一层压敏胶,然后通过压敏胶黏附一层隔离纸,得到防水卷材。本发明制备的防水卷材既具有PP塑料的性能又具有顺丁橡胶的性能,同时在交联位点上含有大量的氟元素,能够有效防止聚合物的老化,实现PP材料的回收利用,并且能够很好的利用PP材料本身质量轻防水的性能。(The invention discloses a recycling and processing technology based on waste PP plastic, which comprises the following specific processing processes: adding the waste PP plastic into a grinder for grinding and granulating; simultaneously adding PP plastic master batch and butadiene rubber into a plasticator, adding antioxidant cross-linking agent and sodium persulfate after melt plastication, adding plasticizer, nano silicon dioxide, quartz powder and carbon black after plastication, continuously mixing and discharging rubber; and melting the sizing material, coating the sizing material on the upper surface and the lower surface of the asbestos cloth, cooling and solidifying to obtain a waterproof sheet layer, coating a layer of pressure-sensitive adhesive on the bottom surface of the waterproof sheet layer, and adhering a layer of isolation paper through the pressure-sensitive adhesive to obtain the waterproof coiled material. The waterproof coiled material prepared by the invention has the performance of PP plastic and the performance of butadiene rubber, contains a large amount of fluorine elements on crosslinking sites, can effectively prevent the aging of polymers, realizes the recycling of PP materials, and can well utilize the light weight and waterproof performance of the PP materials.)

1. A recycling and processing technology based on waste PP plastics is characterized by comprising the following specific processing steps:

firstly, adding waste PP plastic into a grinder for grinding and granulating;

secondly, simultaneously adding the PP plastic master batch and the butadiene rubber into a plasticator, melting and plasticating for 2-3min, then adding the antioxidant cross-linking agent and the sodium persulfate into the mixture, plasticating for 1-2h, then adding the plasticizer, the nano silicon dioxide, the quartz powder and the carbon black into the mixture, continuing to mix for 2-3min, and then discharging the rubber;

thirdly, coating the melted sizing material on the surface of the asbestos cloth, cooling and solidifying, coating a layer of melted sizing material on the bottom surface of the asbestos cloth, and cooling and solidifying to obtain a waterproof sheet layer;

and fourthly, coating a layer of pressure-sensitive adhesive on the bottom surface of the waterproof sheet layer, and then adhering a layer of release paper through the pressure-sensitive adhesive to obtain the waterproof roll.

2. The recycling and processing technology of the waste PP plastic according to claim 1, wherein in the second step, the mass ratio of PP plastic master batch to butadiene rubber is 1: 1.2, simultaneously adding 1.6-1.7g of antioxidant cross-linking agent, 12-14g of sodium persulfate, 0.8-0.9g of plasticizer, 1.3-1.5g of nano silicon dioxide, 4-5g of quartz powder and 2-3g of carbon black into each 100 g of PP plastic master batch.

3. The recycling process of waste PP plastic according to claim 1, wherein the antioxidant cross-linking agent is prepared by the following steps:

①, weighing a certain amount of 4-diethylamino salicylaldehyde, adding the 4-diethylamino salicylaldehyde into an acetone solution, stirring and dissolving, then adding 2, 6-difluoroaniline into a reaction vessel, heating to 60-70 ℃, carrying out reflux reaction for 5-6 hours, and then carrying out reduced pressure distillation to obtain a product A;

② adding a mixed acid solution obtained by mixing concentrated sulfuric acid and acetic acid solution according to a volume ratio of 1: 6 into a reaction container, then adding the product A into the reaction container, stirring and dissolving, cooling to 10-15 ℃, then adding a formaldehyde solution and diallylamine with a mass concentration of 37% into the reaction container, stirring and reacting for 2-3h, then heating to 30-35 ℃, stirring and reacting for 1h, then adding the obtained product solution into ice water with a temperature of-5-0 ℃, stirring until solids are separated out, filtering, washing and drying to obtain the antioxidant cross-linking agent.

4. The recycling process of waste PP plastic according to claim 3, wherein 4-diethylamino salicylaldehyde and 2, 6-difluoroaniline are mixed in the mass ratio of 1: 1 in step ①.

5. The recycling process of waste PP plastic as claimed in claim 3, wherein 8-9mL of mixed acid solution, 0.86-0.89g of formaldehyde solution with mass concentration of 37% and 0.23-0.24g of diallylamine are added to each gram of product A in step ②.

6. The recycling process of waste PP plastic according to claim 1, wherein the thickness of the sizing coated on the upper and lower surfaces of the asbestos cloth in the third step is 1mm to 1.5 mm.

Technical Field

The invention belongs to the field of plastic recovery, and relates to a recovery processing technology based on waste PP plastic.

Background

The PP material has high impact resistance, high mechanical property and toughness, resists various organic solvents and acid-base corrosion and is widely applied, but the anti-aging performance and low-temperature resistance of the PP material are low, the PP material is degraded in performance through aging and low-temperature action after long-term use, the PP material is difficult to recycle after recovery, and the waste PP material is difficult to decompose, so that the environment is polluted and resources are wasted.

Disclosure of Invention

The invention aims to provide a recovery processing technology based on waste PP plastic, which is characterized in that the waste PP material and butadiene rubber are subjected to free polymerization through an antioxidant crosslinking agent, the prepared antioxidant crosslinking agent contains two olefin groups, and can be subjected to polymerization reaction with the PP plastic and butadiene rubber simultaneously under the action of an initiator, so that the PP plastic and butadiene rubber are subjected to polymerization crosslinking through the antioxidant crosslinking agent, the prepared product has the performance of both PP plastic and butadiene rubber, and meanwhile, a large amount of fluorine elements are contained on crosslinking sites, so that the aging of a polymer can be effectively prevented, the recycling of the PP material is realized, and the light and waterproof performance of the PP material can be well utilized.

The purpose of the invention can be realized by the following technical scheme:

a recycling and processing technology based on waste PP plastics comprises the following specific processing steps:

firstly, adding waste PP plastic into a grinder for grinding and granulating;

secondly, simultaneously adding the PP plastic master batch and the butadiene rubber into a plasticator, melting and plasticating for 2-3min, then adding the antioxidant cross-linking agent and the sodium persulfate into the mixture, plasticating for 1-2h, then adding the plasticizer, the nano silicon dioxide, the quartz powder and the carbon black into the mixture, continuing to mix for 2-3min, and then discharging the rubber; the PP plastic master batch and the butadiene rubber are mixed according to the mass ratio of 1: 1.2, simultaneously adding 1.6-1.7g of antioxidant cross-linking agent, 12-14g of sodium persulfate, 0.8-0.9g of plasticizer, 1.3-1.5g of nano silicon dioxide, 4-5g of quartz powder and 2-3g of carbon black into per 100 g of PP plastic master batch;

the preparation process of the antioxidant cross-linking agent is as follows:

①, weighing a certain amount of 4-diethylamino salicylaldehyde, adding the 4-diethylamino salicylaldehyde into an acetone solution, stirring for dissolving, then adding 2, 6-difluoroaniline into a reaction container, heating to 60-70 ℃, carrying out reflux reaction for 5-6h, and then carrying out reduced pressure distillation to obtain a product A, wherein the 4-diethylamino salicylaldehyde and the 2, 6-difluoroaniline are mixed according to the mass ratio of 1: 1 to prepare the product A, and the 4-diethylamino salicylaldehyde contains aldehyde groups and can react with amino groups in the 2, 6-difluoroaniline to generate-C-N-bonds, so that two fluorine elements are introduced into the product A;

② adding a mixed acid solution obtained by mixing concentrated sulfuric acid and acetic acid solution according to a volume ratio of 1: 6 into a reaction container, adding a product A into the reaction container, stirring for dissolving, cooling to 10-15 ℃, adding a formaldehyde solution and diallylamine with a mass concentration of 37% into the reaction container, stirring for reacting for 2-3h, heating to 30-35 ℃, stirring for reacting for 1h, adding the obtained product solution into ice water with a temperature of-5-0 ℃, stirring for solid precipitation, filtering, washing and drying to obtain the antioxidant crosslinking agent, wherein 8-9mL of the mixed acid solution is added into each gram of the product A, 0.86-0.89g of the formaldehyde solution with a mass concentration of 37% and 0.23-0.24g of the diallylamine are added, the amino group of the phenolic hydroxyl group has an ortho-position activating effect, the para-position hydrogen ion of the phenolic hydroxyl group has a higher active double bond, the C-N-double bond has a meta-position activating effect, the amino group of the phenolic hydroxyl group has a higher active hydrogen ion, the para-position double bond, the amino group has a higher active hydrogen ion performance, the methylation effect, the cis-amino group and the meta-position activating effect, the antioxidant crosslinking initiator can be used for preparing crosslinked plastic, and the antioxidant crosslinking initiator, so that the antioxidant crosslinking rubber can be introduced into a crosslinking plastic, and a crosslinking plastic with a crosslinking plastic, so that the antioxidant crosslinking rubber can be prepared under the polypropylene rubber, and a great amount of the antioxidant crosslinking rubber can have an antioxidant crosslinking initiator can have an aging-resistant crosslinking rubber, and a great amount of a crosslinking;

thirdly, coating the melted sizing material on the surface of the asbestos cloth, cooling and solidifying, coating a layer of melted sizing material on the bottom surface of the asbestos cloth, and cooling and solidifying to obtain a waterproof sheet layer; wherein the thickness of the sizing material coated on the upper surface and the lower surface is 1mm-1.5 mm;

fourthly, coating a layer of pressure-sensitive adhesive on the bottom surface of the waterproof sheet layer, and then adhering a layer of release paper through the pressure-sensitive adhesive to obtain the waterproof roll; the PP plastic is the lightest plastic in the plastics, has higher corrosion resistance and waterproof performance, but has lower low-temperature resistance, and the butadiene rubber has higher low-temperature resistance, so that the polymer prepared by polymerizing the PP plastic and the butadiene rubber through the antioxidant crosslinking agent has the performance of both the PP plastic and the butadiene rubber, not only has light weight, but also can resist low temperature, and contains a large amount of fluorine elements on crosslinking sites, thereby effectively preventing the aging of the polymer.

The invention has the beneficial effects that:

according to the invention, the waste PP material and the butadiene rubber are subjected to free polymerization through the antioxidant cross-linking agent, and the prepared antioxidant cross-linking agent contains two olefin groups, so that the prepared antioxidant cross-linking agent can be subjected to polymerization reaction with PP plastic and butadiene rubber simultaneously under the action of an initiator, and the PP plastic and the butadiene rubber are subjected to polymerization cross-linking through the antioxidant cross-linking agent, so that the prepared product has the performances of both PP plastic and butadiene rubber, not only is light in weight and high in waterproof performance, but also can resist low temperature and simultaneously contains a large amount of fluorine elements on cross-linking sites, the aging of the polymer can be effectively prevented, and the recycling of the PP material is realized.

Detailed Description