阅读说明：本技术 一种超高乙烯含量共聚聚丙烯的生产工艺 (Production process of copolymerized polypropylene with ultrahigh ethylene content ) 是由 吴义 吴文林 戚琳 蒋翠萍 于 2020-05-29 设计创作，主要内容包括：本发明公开了一种超高乙烯含量共聚聚丙烯的生产工艺,包括如下步骤：向反应釜中投入丙烯,通过控制循环水流量和控制压力来控制一定的反应条件；向反应釜中内通入乙烯,然后加入氢气,待反应平稳后,再加入乙烯,直到反应结束；反应完毕后,进行高压回收和中压回收,当回至压力低于规定值,停止回收操作,向闪蒸釜内喷放物料。本发明的共聚产品在不使用改性剂的情况,抗冲性能得到提高,产品均一性更好,产品质量和加工过程更加稳定,同时,解决了改性剂采购困难的问题,降低共聚吨产品成本,增加企业效益,具有较大的意义。(The invention discloses a production process of copolymerized polypropylene with ultrahigh ethylene content, which comprises the following steps: feeding propylene into the reaction kettle, and controlling certain reaction conditions by controlling circulating water flow and controlling pressure; introducing ethylene into the reaction kettle, then adding hydrogen, and after the reaction is stable, adding ethylene until the reaction is finished; and after the reaction is finished, carrying out high-pressure recovery and medium-pressure recovery, stopping recovery operation when the pressure is lower than a specified value, and spraying materials into the flash evaporation kettle. The copolymerization product of the invention improves the impact resistance, has better product uniformity and more stable product quality and processing process under the condition of not using a modifier, solves the problem of difficult purchasing of the modifier, reduces the cost of the copolymerization ton product, increases the enterprise benefit and has greater significance.)

1. A production process of copolymerized polypropylene with ultrahigh ethylene content is characterized in that: the method comprises the following steps:

feeding propylene into a reaction kettle, and controlling certain reaction conditions by controlling circulating water flow and pressure;

step two, introducing ethylene into the reaction kettle, then adding hydrogen, and after the reaction is stable, adding ethylene until the reaction is finished;

and step three, after the reaction is finished, performing high-pressure recovery and medium-pressure recovery, stopping recovery operation when the pressure is lower than a specified value, and spraying materials into the flash evaporation kettle.

2. The process for producing an ultra-high ethylene content co-polypropylene according to claim 1, wherein: in the first step, the circulating water flow is 0.5-1L/min, and the pressure is controlled to be 2.0MP-4.0 MP.

Technical Field

The invention belongs to the technical field of high polymer materials, and particularly relates to a production process of copolymerized polypropylene with ultrahigh ethylene content.

Background

The polypropylene copolymer has the advantages of high strength, high rigidity, heat resistance, stable size, good processing performance and excellent low-temperature toughness, and can be widely used for producing turnover boxes, bottles, paint buckets, large containers, heavy-load packages and the like. At present, the process for producing the co-polypropylene at home and abroad adopts a continuous method, but the co-polypropylene produced by the method needs a modifier, but the modifier is difficult to purchase and has high cost, and in addition, the product has poor impact resistance and product uniformity, and the product quality and the processing process stability are low.

Disclosure of Invention

The invention aims to solve the problem of providing a production process of the copolymerized polypropylene with the ultrahigh ethylene content, which does not need a modifier, improves the impact resistance, has good product uniformity and more stable product quality and processing process.

In order to solve the technical problems, the invention adopts the technical scheme that: a production process of copolymerized polypropylene with ultrahigh ethylene content comprises the following steps:

feeding propylene into a reaction kettle, and controlling certain reaction conditions by controlling circulating water flow and pressure;

step two, introducing ethylene into the reaction kettle, then adding hydrogen, and after the reaction is stable, adding ethylene until the reaction is finished;

and step three, after the reaction is finished, performing high-pressure recovery and medium-pressure recovery, stopping recovery operation when the pressure is lower than a specified value, and spraying materials into the flash evaporation kettle.

In the first step, the circulating water flow is 0.5-1L/min, and the pressure is controlled to be 2.0MP-4.0 MP.

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

the beneficial effects of the invention are as follows: the invention utilizes an intermittent method to produce the copolymerized polypropylene, and the process research of the copolymerized polypropylene with ultrahigh ethylene content is a basic research which greatly improves the quality of the copolymerized polypropylene product from the technical process and is made for consolidating the market of the homopolymerized polypropylene and expanding the market of the copolymerized polypropylene.

The copolymerization product of the invention improves the impact resistance, has better product uniformity and more stable product quality and processing process under the condition of not using a modifier, solves the problem of difficult purchasing of the modifier, reduces the cost of the copolymerization ton product, increases the enterprise benefit and has greater significance. In addition, the invention reduces the melting point of copolymerization, overcomes the technical difficulty that the melting point of the copolymerization material is high, and has a promoting effect on the polypropylene industry.

Detailed Description

The invention is further described with reference to the following examples:

the invention provides a production process of copolymerized polypropylene with ultrahigh ethylene content, which comprises the following steps:

feeding propylene into a reaction kettle, and controlling certain reaction conditions by controlling circulating water flow and pressure;

step two, introducing ethylene into the reaction kettle, then adding hydrogen, and after the reaction is stable, adding ethylene until the reaction is finished;

and step three, after the reaction is finished, performing high-pressure recovery and medium-pressure recovery, stopping recovery operation when the pressure is lower than a specified value, and spraying materials into the flash evaporation kettle.

The circulating water flow is 0.8L/min, and the control pressure is 3.0MP

The following are the main technical indicators of the embodiment:

the invention utilizes an intermittent method to produce the copolymerized polypropylene, and the process research of the copolymerized polypropylene with ultrahigh ethylene content is a basic research which greatly improves the quality of the copolymerized polypropylene product from the technical process and is made for consolidating the market of the homopolymerized polypropylene and expanding the market of the copolymerized polypropylene.

The copolymerization product of the invention improves the impact resistance, has better product uniformity and more stable product quality and processing process under the condition of not using a modifier, solves the problem of difficult purchasing of the modifier, reduces the cost of the copolymerization ton product, increases the enterprise benefit and has greater significance. In addition, the invention reduces the melting point of copolymerization, overcomes the technical difficulty that the melting point of the copolymerization material is high, and has a promoting effect on the polypropylene industry.

The embodiments of the present invention have been described in detail, but the description is only for the preferred embodiments of the present invention and should not be construed as limiting the scope of the present invention. All equivalent changes and modifications made within the scope of the present invention should be covered by the present patent.