阅读说明：本技术 一种含复合有机磷酸盐类透明成核剂的聚丙烯增韧母粒及其制备方法 (Polypropylene toughening master batch containing composite organic phosphate transparent nucleating agent and preparation method thereof ) 是由 姚春生 于 2019-11-15 设计创作，主要内容包括：本发明公开了一种含复合有机磷酸盐类透明成核剂的聚丙烯增韧母粒及其制备方法。所述成核剂包括如下质量份数的组分：有机磷酸盐或其衍生物10～65份、有机锂化合物5～30份和无机氧化物10～25份；其中,所述有机锂化合物为烷基锂化合物、芳基锂化合物、胺基锂化合物中至少一种；所述成核剂的粒径为0.8～90.0μm。本发明通过在聚丙烯中加入所述复合型有机磷酸盐类透明成核剂,可以得到具有良好的常温冲击强度、低温冲击强度和耐热性能的聚丙烯材料,同时其它机械性能不降低；本发明的制备方法科学合理、简单易行。(The invention discloses a polypropylene toughening master batch containing a composite organic phosphate transparent nucleating agent and a preparation method thereof. The nucleating agent comprises the following components in parts by mass: 10-65 parts of organic phosphate or derivatives thereof, 5-30 parts of organic lithium compounds and 10-25 parts of inorganic oxides; wherein, the organic lithium compound is at least one of alkyl lithium compound, aryl lithium compound and amido lithium compound; the grain size of the nucleating agent is 0.8-90.0 mu m. According to the invention, the composite transparent nucleating agent of organic phosphate is added into polypropylene, so that the polypropylene material with good normal-temperature impact strength, low-temperature impact strength and heat resistance can be obtained, and meanwhile, other mechanical properties are not reduced; the preparation method is scientific, reasonable, simple and feasible.)

1. The composite transparent nucleating agent of organic phosphate is characterized by comprising the following components in parts by weight:

10-65 parts of organic phosphate or its derivative

5-30 parts of organic lithium compound

10-25 parts of inorganic oxide;

wherein, the organic lithium compound is at least one of alkyl lithium compound, aryl lithium compound and amido lithium compound;

the grain size of the nucleating agent is 0.8-90.0 mu m.

2. The composite type organic phosphate transparent nucleating agent according to claim 1, wherein the organic phosphate or its derivative comprises at least one of 2, 2 '-methylenebis (4, 6-di-tert-butylphenol) phosphate and 2, 2' -methylenebis (2, 4-di-tert-butylphenol) phosphate.

3. The composite type transparent nucleating agent of organic phosphates as claimed in claim 1 or 2, wherein said inorganic oxide is at least one of zinc oxide, antimony oxide and cadmium oxide, and has an average particle diameter of 10.5 μm and a bulk density of 5.05g/100 mL.

4. The polypropylene toughening master batch is characterized by comprising the following components in parts by mass:

5. the polypropylene toughening masterbatch of claim 4, wherein the polypropylene particles are at least one of homo polypropylene, random co-polypropylene, and block co-polypropylene.

6. The polypropylene toughening masterbatch of claim 4, wherein the antioxidant is at least one of tetra [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionate ] pentaerythritol ester and tris [2, 4-di-tert-butylphenyl ] phosphite.

7. The polypropylene toughening masterbatch of claim 4, wherein the compatibilizer is at least one of white oil, phthalate, and maleic anhydride.

8. The polypropylene toughening masterbatch of claim 4, wherein the lubricant is one of calcium stearate, zinc stearate, cadmium stearate and barium stearate.

9. A process for the preparation of a polypropylene toughening masterbatch according to any one of claims 4 to 8, characterized by comprising the steps of:

(1) weighing the raw material components according to the mass ratio;

(2) putting the raw material components into a high-speed mixer for dry mixing treatment;

(3) and (3) placing the product obtained by mixing in the step (2) into a double-screw extruder, mixing, melting, extruding and granulating to obtain the polypropylene toughening master batch.

10. The preparation method of the polypropylene toughening master batch of claim 9, wherein the mixing process parameters are as follows: the rotating speed is 1200-1800 r/min, and the time is 5-8 min;

the double-screw extruder is a co-rotating double-screw extruder, and the highest section temperature of the double-screw extruder is 190-240 ℃.

Technical Field

The invention relates to the technical field of high polymer materials, in particular to a polypropylene toughening master batch containing a composite organic phosphate transparent nucleating agent and a preparation method thereof.

Background

Polypropylene (PP) is a thermoplastic synthetic resin with excellent performance, and is a variety with the shortest development history and the fastest growth among five general thermoplastic resins. It has good comprehensive properties, such as good processing property, high tensile strength and elastic modulus, small relative density, excellent stress resistance and chemical resistance, and the like; rich raw material source, no toxicity, easy recovery, low production energy consumption, less pollution and the like, so the method is widely applied to the aspects of automobile industry, electronics, household appliances, packaging, building materials and the like. In recent years, the high-fluidity transparent polypropylene subjected to rapid thin-wall injection molding has wide application prospects in the fields of food-grade packaging, medical sanitation, household storage products and the like, but under the normal conditions, the general transparent polypropylene has poor low-temperature resistance, the embrittlement temperature is only-30 ℃ -10 ℃ (polyethylene is about-60 ℃), the impact resistance at low temperature even room temperature is poor, the polypropylene is easy to crack at low temperature, and the rigidity and toughness balance is poor, so that the application of the polypropylene is limited to a great extent.

The nucleating agent is a functional chemical auxiliary agent which can change the partial crystallization behavior of a polymer, improve the transparency, rigidity, surface gloss, impact toughness and heat distortion temperature of a product, shorten the molding cycle of the product and improve the processing and application performance of the product, and the action mechanism is as follows: in a molten state, the nucleating agent provides required crystal nuclei, and the polymer is converted from original homogeneous nucleation to heterogeneous nucleation, so that the crystallization speed is accelerated, the crystal grain structure is refined, the product rigidity is improved, the molding period is shortened, the dimensional stability of a final product is maintained, the light scattering is inhibited, the transparency and the surface gloss of the product and the physical and mechanical properties (such as rigidity and modulus) of the polymer are kept unchanged, and the processing period is shortened. The organic phosphate nucleating agent can improve the polypropylene crystallization temperature and the mechanical property to a certain extent besides improving the polypropylene transparency and toughness, but the organic phosphate nucleating agent has higher melting point which is higher than the polymer melting temperature, so that the nucleating agent has poor dispersibility in polypropylene materials and influences the toughening effect.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provide the polypropylene toughening master batch containing the composite organic phosphate transparent nucleating agent and the preparation method thereof, which can greatly improve the toughness of polypropylene while maintaining the original rigidity, strength and transparency of the polypropylene.

In order to achieve the purpose, the technical scheme adopted by the invention is as follows:

a composite transparent nucleating agent of organic phosphates comprises the following components in parts by weight:

10-65 parts of organic phosphate or its derivative

5-30 parts of organic lithium compound

10-25 parts of inorganic oxide;

the organic lithium compound is at least one of alkyl lithium compound, aryl lithium compound and amido lithium compound; the grain size of the nucleating agent is 0.8-90.0 mu m.

According to the invention, the organic phosphate or the derivative thereof, the organic lithium compound and the inorganic oxide are compounded, and the nucleating agent with the grain size of 0.8-90.0 mu m is prepared through surface treatment and refinement, has a lower melting point and good dispersibility in the polypropylene material, improves the nucleating effect, reduces the using amount of the nucleating agent, and further improves the rigidity, the strength and the transparency of the polypropylene while toughening.

Preferably, the organophosphate or derivative thereof comprises at least one of 2, 2 '-methylenebis (4, 6-di-tert-butylphenol) phosphate, 2' -methylenebis (2, 4-di-tert-butylphenol) phosphate.

Preferably, the inorganic oxide is at least one of zinc oxide, antimony oxide and cadmium oxide, the average particle diameter of the inorganic oxide is 10.5 μm, and the bulk density is 5.05g/100 mL.

The invention also provides a polypropylene toughening master batch which comprises the following components in parts by mass:

according to the invention, the composite organic phosphate transparent nucleating agent, the compatilizer, the antioxidant and the lubricant are added into polypropylene, so that the prepared polypropylene toughening master batch has the advantages of no reduction of strength and rigidity, and good low-temperature impact resistance toughness.

Preferably, the polypropylene is polypropylene particles.

Preferably, the polypropylene particles are at least one of homo-polypropylene, random co-polypropylene and block co-polypropylene.

Preferably, the antioxidant is at least one of tetra [ beta- (3, 5-di-tert-butyl-4-hydroxyphenyl) propionic acid ] pentaerythritol ester and tri [2, 4-di-tert-butylphenyl ] phosphite.

Preferably, the compatibilizer is at least one of white oil, phthalate, and maleic anhydride, which helps to improve the homogeneity of the polypropylene and nucleating agent when mixed.

Preferably, the lubricant is one of calcium stearate, zinc stearate, cadmium stearate and barium stearate.

The invention also provides a preparation method of the polypropylene toughening master batch, which comprises the following steps:

(1) weighing the raw material components according to the mass ratio;

(2) putting the raw material components into a high-speed mixer for dry mixing treatment;

(3) and (3) placing the product obtained by mixing in the step (2) into a double-screw extruder, mixing, melting, extruding and granulating to obtain the polypropylene toughening master batch.

Preferably, the mixing process parameters are as follows: the rotation speed is 1200-1800 r/min, and the time is 5-8 min.

Preferably, the twin-screw extruder is a co-rotating twin-screw extruder and the maximum stage temperature of the twin-screw extruder is 190 to 240 ℃.

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

(1) the composite organic phosphate transparent nucleating agent of the invention overcomes the problem of poor transparency and glossiness of the traditional inorganic nucleating agent, and can obviously improve the processing performance of the product.

(2) The composite organic phosphate transparent nucleating agent has good dispersibility and nucleating effect in polypropylene materials, and overcomes the problems of high melting point and poor dispersibility in polymers of organic phosphate nucleating agents.

(3) The polypropylene product modified by the composite organic phosphate transparent nucleating agent has greatly improved transparency, rigidity, surface hardness and thermal deformation temperature, and good thermal stability, and does not affect other performances of the polypropylene product under high temperature conditions.

Detailed Description

To better illustrate the objects, aspects and advantages of the present invention, the present invention will be further described with reference to specific examples. It will be understood by those skilled in the art that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.