阅读说明：本技术 一种用于增透聚丙烯成核助剂的制备方法和应用 (Preparation method and application of nucleation auxiliary agent for anti-reflection polypropylene ) 是由 郭向荣 王海 于 2020-07-06 设计创作，主要内容包括：本发明公开了一种用于增透聚丙烯成核助剂的制备方法和应用,该方法是将由纳米滑石粉、纳米碳酸钙和纳米二氧化硅复配组成无机成核剂,经除湿、硅烷偶联剂改性后分散于水中,得到混合液B；将山梨醇类成核剂加入到醇溶剂中,得到混合液A,按比例将混合液A直接加入混合液B中,所述山梨醇类成核剂与无机成核剂的质量比为25∶75～70∶30,超声分散,混匀后加入到喷雾干燥器内进行喷雾干燥,制得用于增透聚丙烯成核助剂,可用于聚丙烯成型加工。本发明的成核助剂可改善聚丙烯的力学性能和光学性能,制备工艺简单,可工业化生产。(The invention discloses a preparation method and application of an anti-reflection polypropylene nucleation auxiliary agent, wherein an inorganic nucleating agent is formed by compounding nano talcum powder, nano calcium carbonate and nano silicon dioxide, and is dispersed in water after dehumidification and modification by a silane coupling agent to obtain a mixed solution B; adding a sorbitol nucleating agent into an alcohol solvent to obtain a mixed solution A, directly adding the mixed solution A into a mixed solution B according to a proportion, wherein the mass ratio of the sorbitol nucleating agent to the inorganic nucleating agent is 25: 75-70: 30, ultrasonically dispersing, uniformly mixing, adding into a spray dryer, and performing spray drying to obtain the anti-reflection polypropylene nucleating aid which can be used for polypropylene molding and processing. The nucleating additive can improve the mechanical property and the optical property of polypropylene, has simple preparation process and can be industrially produced.)

1. A preparation method of an anti-reflection polypropylene nucleation auxiliary agent is characterized by comprising the following steps: the method comprises the following steps: (1) putting the inorganic nano particles into a high-speed mixer, stirring and mixing at a high speed, dehumidifying when the temperature reaches 80-90 ℃, and adding a silane coupling agent to mix and stir for 5-10 min when the temperature reaches 120-160 ℃; then, placing the mixture in the high-speed mixer into a cold mixer for cooling, and discharging when the temperature is reduced to 30-50 ℃ to obtain a modified inorganic nucleating agent; the inorganic nano particles are formed by compounding nano talcum powder, nano calcium carbonate and nano silicon dioxide according to the mass ratio of 2-3: 2-4: 1; (2) adding a sorbitol nucleating agent into an alcohol solvent, and stirring until the sorbitol nucleating agent is completely dissolved to obtain a mixed solution A; (3) dispersing the modified inorganic nucleating agent prepared in the step (1) in water to obtain a mixed solution B; (4) and directly adding the mixed solution A into the mixed solution B according to the mass ratio of the sorbitol nucleating agent to the inorganic nucleating agent of 25: 75-70: 30, performing ultrasonic dispersion, uniformly mixing, adding into a spray dryer, and performing spray drying to obtain the anti-reflection polypropylene nucleating aid.

2. The preparation method of an anti-reflection polypropylene nucleation aid according to claim 1, wherein the preparation method comprises the following steps: the particle size of the nano talcum powder is 10-50 nm, the particle size of the nano calcium carbonate is 15-30 nm, and the particle size of the nano silicon dioxide is 20-500 nm.

3. The preparation method of an anti-reflection polypropylene nucleation aid according to claim 1, wherein the preparation method comprises the following steps: the sorbitol nucleating agent is bis-1, 3: 2, 4- (4' -propylbenzylidene) -1-propylsorbitol, 1, 3: 2, 4-dibenzylidene sorbitol, 1, 3: 2, 4-bis (p-methylbenzylidene) sorbitol, 1, 3: 2, 4-di (3, 4-dimethylene benzylidene) sorbitol or a combination of several of the same.

4. The preparation method of an anti-reflection polypropylene nucleation aid according to claim 1, wherein the preparation method comprises the following steps: the alcohol solvent is absolute ethyl alcohol or absolute methyl alcohol.

5. The preparation method of an anti-reflection polypropylene nucleation aid according to claim 1, wherein the preparation method comprises the following steps: and (4) the ultrasonic dispersion time in the step (4) is 20-30 min.

6. The preparation method of an anti-reflection polypropylene nucleation aid according to claim 1, wherein the preparation method comprises the following steps: the spray drying conditions in the step (4) are as follows: the air inlet temperature is 90-160 ℃, and the air outlet temperature is 50-80 ℃.

7. The preparation method of an anti-reflection polypropylene nucleation aid according to claim 1, wherein the preparation method comprises the following steps: the silane coupling agent is bis- (2- (triethoxysilane) propyl) -tetrasulfide or bis- (gamma- (triethoxysilyl) propyl) -disulfide.

8. Use of an anti-reflective polypropylene nucleation aid prepared by the process of any one of claims 1 to 7 in polypropylene molding processes.

9. The use of claim 8, wherein the amount of the nucleation aid for antireflective polypropylene is 0.1-0.5% of the total mass of the polypropylene.

Technical Field

The invention relates to the field of nucleating agents, and particularly relates to a preparation method and application of an anti-reflection polypropylene nucleating aid.

Background

Polypropylene (PP) is a thermoplastic polymer obtained by polymerizing propylene, and can be classified into isotactic polypropylene (i-PP), syndiotactic polypropylene (s-PP), and atactic polypropylene (a-PP) according to the arrangement of methyl groups in the main chain. In addition to the spatial configuration of the molecular chain, the processing and application properties of PP depend to a large extent on its crystallization temperature, crystal morphology and grain size, etc. Generally, the crystal structure of PP is considered to be monoclinic alpha crystal form, hexagonal beta crystal form, triclinic gamma crystal form, smectic structure and pseudo-hexagonal crystal form, wherein the most widely used crystal structure is alpha crystal form and beta crystal form, and other crystal structures are unstable and have low application value, so that PP is not common.

The polypropylene nucleating agent is an auxiliary agent used for changing the crystallization behavior of PP, thereby changing the crystallization form of PP, and finally improving the physical mechanical property and the thermodynamic property of PP. The nucleating agents are classified into inorganic nucleating agents, sorbitol nucleating agents, phosphate nucleating agents, rosin nucleating agents and high-molecular nucleating agents. In recent years, in order to fully exert the advantages of various nucleating agents, researches have been focused on the synergistic effect between different nucleating agents or between the nucleating agent and other auxiliary agents.

How to prepare the polypropylene nucleating agent with low price and excellent performance is one direction of research.

Disclosure of Invention

One of the purposes of the invention is to provide a preparation method of an anti-reflection polypropylene nucleation auxiliary agent, which is low in cost and simple in process.

In order to achieve the purpose, the technical scheme adopted by the invention is as follows: a preparation method of an anti-reflection polypropylene nucleation auxiliary agent comprises the following steps:

(1) putting the inorganic nano particles into a high-speed mixer, stirring and mixing at a high speed, dehumidifying when the temperature reaches 80-90 ℃, and adding a silane coupling agent to mix and stir for 5-10 min when the temperature reaches 120-160 ℃; then, placing the mixture in the high-speed mixer into a cold mixer for cooling, and discharging when the temperature is reduced to 30-50 ℃ to obtain a modified inorganic nucleating agent; the inorganic nano particles are formed by compounding nano talcum powder, nano calcium carbonate and nano silicon dioxide according to the mass ratio of 2-3: 2-4: 1;

(2) adding a sorbitol nucleating agent into an alcohol solvent, and stirring until the sorbitol nucleating agent is completely dissolved to obtain a mixed solution A;

(3) dispersing the modified inorganic nucleating agent prepared in the step (1) in water to obtain a mixed solution B;

(4) and directly adding the mixed solution A into the mixed solution B according to the mass ratio of the sorbitol nucleating agent to the inorganic nucleating agent of 25: 75-70: 30, performing ultrasonic dispersion, uniformly mixing, adding into a spray dryer, and performing spray drying to obtain the anti-reflection polypropylene nucleating aid.

Preferably, the particle size of the nano talcum powder is 10-50 nm, the particle size of the nano calcium carbonate is 15-30 nm, and the particle size of the nano silicon dioxide is 20-500 nm.

Preferably, the sorbitol nucleating agent is one or a combination of bis-1, 3: 2, 4- (4' -propylbenzylidene) -1-propylsorbitol, 1, 3: 2, 4-dibenzylidene sorbitol, 1, 3: 2, 4-di (p-methylbenzylidene) sorbitol and 1, 3: 2, 4-di (3, 4-dimethylylidene) sorbitol.

Preferably, the alcohol solvent is absolute ethyl alcohol or absolute methyl alcohol.

Preferably, the ultrasonic dispersion time in the step (4) is 20-30 min.

Preferably, the conditions of the spray drying in the step 4) are as follows: the air inlet temperature is 90-160 ℃, and the air outlet temperature is 50-80 ℃.

Preferably, the silane coupling agent is bis- (2- (triethoxysilane) propyl) -tetrasulfide or bis- (gamma- (triethoxysilyl) propyl) -disulfide.

The invention also aims to provide an application of the anti-reflection polypropylene nucleation auxiliary agent prepared by the method in polypropylene forming processing.

The dosage of the nucleation auxiliary agent for the anti-reflection polypropylene is 0.1-0.5% of the total mass of the polypropylene.

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

1. the added inorganic nano particles are changed from inorganic to organic by adopting the procedures of dehumidification and modification, and the surface hydrophilic and oleophobic properties are changed into oleophilic and hydrophobic properties, thereby solving the problems of particle agglomeration and poor dispersibility when the inorganic nucleating agent is added.

2. According to the invention, three different nanoscale inorganic nucleating agents, namely talcum powder, calcium carbonate and silicon dioxide, are modified together and then are compounded with the sorbitol organic nucleating agent to obtain the nucleating aid for anti-reflection polypropylene.

3. The nucleation auxiliary agent prepared by the invention has the advantages of low price, simple preparation process and good dispersion and nucleation effects.

Detailed Description

The present invention will be described in further detail with reference to specific examples.

In the following embodiments, the particle size of the nano talc powder is 10 to 50nm, the particle size of the nano calcium carbonate is 15 to 30nm, and the particle size of the nano silica is 20 to 500 nm.