阅读说明：本技术 一种新型受阻酚类抗氧剂及其制备方法 (Novel hindered phenol antioxidant and preparation method thereof ) 是由 付建英 张忠东 李雪冰 刘明月 李中映 张永兴 于 2021-10-12 设计创作，主要内容包括：本发明提供了一种新型高效受阻酚类抗氧剂,具有式Ⅰ所示结构。本发明通过分子结构设计,开拓性地选择β-(3-叔丁基-4-羟基-5-甲基苯基)丙酸甲酯和十八碳醇为主要原料设计构建了一种全新的多元半受阻酚抗氧剂,其具有抗氧化活性高,相容性好的优势,抗氧化性能显著优于传统受阻酚抗氧剂。(The invention provides a novel efficient hindered phenol antioxidant which has a structure shown in a formula I. According to the invention, through molecular structure design, beta- (3-tert-butyl-4-hydroxy-5-methylphenyl) methyl propionate and octadecanol are selected as main raw materials to design and construct a brand new multi-component semi-hindered phenol antioxidant, which has the advantages of high antioxidant activity and good compatibility, and the antioxidant performance is obviously superior to that of the traditional hindered phenol antioxidant.)

1. A novel hindered phenol antioxidant has the structure shown in formula I:

2. the preparation method of the novel hindered phenol antioxidant shown as the formula I comprises the following steps:

reacting beta- (3-tert-butyl-4-hydroxy-5-methylphenyl) methyl propionate with octadecanol under the action of a catalyst to obtain a novel hindered phenol antioxidant shown as a formula I;

3. the preparation method according to claim 2, wherein the catalyst is selected from one or more of alkaline earth metal or alkali metal salts of organic acids.

4. The method according to claim 3, wherein the catalyst is selected from lithium amide, or a mixed catalyst of lithium amide and zinc stearate.

5. The method of claim 2, wherein the reacting comprises:

the first stage is as follows: heating, and keeping the reaction at the temperature of 100-140 ℃; the gauge pressure of the vacuum degree in the reaction bottle is-50 to-80 KPa;

and a second stage: keeping the reaction at the temperature of 120-160 ℃; the gauge pressure of the vacuum degree in the reaction bottle is-70 to-80 KPa;

and a third stage: keeping the reaction at the temperature of 140-170 ℃; the gauge pressure of the vacuum degree in the reaction bottle is-70 to-80 KPa;

a fourth stage: keeping the reaction at the temperature of 160-180 ℃; the gauge pressure of the vacuum degree in the reaction bottle is less than or equal to-98 KPa;

the fifth stage: keeping the reaction at the temperature of 170-190 ℃; the absolute pressure is gradually reduced to below 600 Pa;

the sixth stage: methyl β - (3-tert-butyl-4-hydroxy-5-methylphenyl) propionate was distilled off at the following temperature: 190-200 ℃, absolute pressure: below 600 Pa;

dissolving: cooling to below 90 ℃, adding a solvent, and stirring at 65-85 ℃ to completely dissolve the reaction solution;

and (3) crystallization: and cooling and crystallizing the system to obtain the novel hindered phenol antioxidant shown in the formula I.

6. The preparation method according to claim 5, wherein the temperature-reduction crystallization is specifically:

and cooling the system to 46-48 ℃, preserving heat for 5-10 minutes, cooling the system to 28-30 ℃, stirring for 5-10 minutes, performing suction filtration, washing a filter cake with a solvent, and collecting solid filter residues.

7. The preparation method according to claim 2, wherein the molar ratio of the methyl β - (3-tert-butyl-4-hydroxy-5-methylphenyl) propionate to the octadecanol is 0.9-1.1: 1.0.

8. The method according to claim 2, wherein the amount of the catalyst is 0.1 to 1.0% of the amount of methyl β - (3-tert-butyl-4-hydroxy-5-methylphenyl) propionate.

9. Use of the novel hindered phenol antioxidant of claim 1 or the novel hindered phenol antioxidant prepared by the preparation method of any one of claims 2 to 8 as an antioxidant for plastic materials.

10. A plastic material comprising the novel hindered phenol antioxidant of claim 1 or the novel hindered phenol antioxidant prepared by the preparation method of any one of claims 2 to 8.

Technical Field

The invention relates to the technical field of antioxidants for high polymer materials, in particular to a novel hindered phenol antioxidant and a preparation method thereof.

Background

During processing, storage and use of the polymer material, the polymer material is easily subjected to the action of stress, metal impurities, light and heat to generate free radicals, the free radicals are further oxidized by oxygen to generate peroxy radicals, and a free radical chain transfer reaction is generated, so that the molecular structure of the polymer is changed, the polymer is discolored, loses glossiness, the appearance is not attractive, further the changes of mechanical property loss, cracking and the like are caused, and the antioxidant is added to improve the processing stability and the appearance color stability of the polymer and prolong the service life. Antioxidants, when present in only small amounts in the polymer system, retard or inhibit the progress of the polymer oxidation process, thereby preventing polymer aging and extending its useful life.

The hindered phenol antioxidant is a main antioxidant with excellent performance, not only prolongs the service life of a polymer, but also protects the stability of the polymer in the processing process, and is widely applied to high polymer materials such as polyolefin, styrene polymer, polyvinyl chloride and the like, and the conventional typical products comprise antioxidants 1010, 1076, 3114, 1330 and the like. 1010, 1076, 3114 and 1330 are the most widely applied solid hindered phenol antioxidants in the field of plastics, and although the antioxidants are already applied for more than fifty years and play a vital role in protection during the processing, storage, transportation and use of plastics, the defects still exist, and are mainly expressed in two aspects: firstly, the oxidation resistance is still to be improved, secondly, the defect of obvious phenol-induced discoloration exists, and thirdly, the compatibility with the material is still required to be further improved. With the progress of society, the development of science and technology and the continuous improvement of living standard, in some scenes with higher requirements on oxidation resistance, the oxidation resistance efficiency, particularly high-temperature resistance, is still to be improved, and the new antioxidant variety with higher oxidation resistance and better application effect is urgently expected in the field of plastics, so that the research and development of a novel hindered phenol antioxidant has very important significance.

Disclosure of Invention

In view of the above, the technical problem to be solved by the present invention is to provide a novel hindered phenol antioxidant and a preparation method thereof, which have high antioxidant performance.

The invention provides a novel hindered phenol antioxidant which has a structure shown in a formula I:

the novel hindered phenol antioxidant provided by the invention contains a semi-hindered phenol structure, replaces a fully hindered phenol structure in a conventional hindered phenol antioxidant, and obtains unexpected antioxidant performance and excellent color stability through preparation and application research, and simultaneously contains a long carbon chain with eighteen carbon atoms, has good compatibility with a high polymer material, and has the advantages of high thermal oxygen stability efficiency and good color stability in the processing and using processes.

The invention provides a preparation method of a novel hindered phenol antioxidant shown in the formula I, which comprises the following steps:

reacting beta- (3-tert-butyl-4-hydroxy-5-methylphenyl) methyl propionate with octadecanol under the action of a catalyst to obtain a novel hindered phenol antioxidant shown as a formula I;

the reaction formula of the preparation method is as follows:

in the invention, the catalyst is preferably selected from one or a mixture of several substances of organic acid salts of alkaline earth metals or alkali metals.

The catalyst is selected from lithium amide or a mixed catalyst of lithium amide and zinc stearate.

Preferably, the reaction is carried out in an inert gas atmosphere, which may be an inert gas known to those skilled in the art, including but not limited to nitrogen.

Preferably, the reaction comprises:

the first stage is as follows: heating, and keeping the reaction at the temperature of 100-140 ℃; the gauge pressure of the vacuum degree in the reaction bottle is-50 to-80 KPa;

and a second stage: keeping the reaction at the temperature of 120-160 ℃; the gauge pressure of the vacuum degree in the reaction bottle is-70 to-80 KPa;

and a third stage: keeping the reaction at the temperature of 140-170 ℃; the gauge pressure of the vacuum degree in the reaction bottle is-70 to-80 KPa;

a fourth stage: keeping the reaction at the temperature of 160-180 ℃; the gauge pressure of the vacuum degree in the reaction bottle is less than or equal to-98 KPa;

the fifth stage: keeping the reaction at the temperature of 170-190 ℃; the absolute pressure is gradually reduced to below 600 Pa;

the sixth stage: methyl β - (3-tert-butyl-4-hydroxy-5-methylphenyl) propionate was distilled off at the following temperature: 190-200 ℃, absolute pressure: below 600 Pa;

dissolving: cooling to below 90 ℃, adding a solvent, and stirring at 65-85 ℃ to completely dissolve the reaction solution;

and (3) crystallization: and cooling and crystallizing the system to obtain the novel hindered phenol antioxidant shown in the formula I.

Preferably, the cooling crystallization specifically comprises:

and cooling the system to 46-48 ℃, preserving heat for 5-10 minutes, cooling the system to 28-30 ℃, stirring for 5-10 minutes, performing suction filtration, washing a filter cake with a solvent, and collecting solid filter residues.

In the present invention, the gauge pressure is a relative pressure.

Absolute pressure in the present invention means absolute pressure.

According to the invention, through the program setting, the process control and the catalyst screening, the high conversion rate of the raw materials is realized, and a novel synthesis idea of the hindered phenol antioxidant is provided.

In the invention, the molar ratio of the beta- (3-tert-butyl-4-hydroxy-5-methylphenyl) methyl propionate to the octadecanol is preferably 0.9-1.1: 1.0.

Preferably, the catalyst is used in an amount of 0.1 to 1.0 percent of the amount of the beta- (3-tert-butyl-4-hydroxy-5-methylphenyl) methyl propionate.

The preparation process has the advantages of low energy consumption, no three wastes, high utilization rate of raw materials, clean and environment-friendly preparation process, realization of high-efficiency, environment-friendly and healthy preparation technology, and extremely high economical efficiency and good social benefit.

The invention provides an application of the novel hindered phenol antioxidant or the novel hindered phenol antioxidant prepared by the preparation method as an antioxidant of a plastic material, in particular an application of the novel hindered phenol antioxidant as an antioxidant of a polypropylene material.

The invention provides a plastic material, which comprises the novel hindered phenol antioxidant or the novel hindered phenol antioxidant prepared by the preparation method.

Preferably, the plastic material is a polypropylene material.

Compared with the prior art, the invention provides a novel efficient hindered phenol antioxidant which has a structure shown in a formula I. According to the invention, through molecular structure design, beta- (3-tert-butyl-4-hydroxy-5-methylphenyl) methyl propionate and octadecanol are selected as main raw materials to design and construct a brand new multi-component semi-hindered phenol antioxidant, which has the advantages of high antioxidant activity and good compatibility, and the antioxidant performance is obviously superior to that of the traditional hindered phenol antioxidant.

Drawings

FIG. 1 is a gas chromatogram of a novel hindered phenol antioxidant prepared in example 3 of the present invention;

FIG. 2 is an IR spectrum of the novel hindered phenol antioxidant prepared in example 3 of the present invention.

Detailed Description

In order to further illustrate the present invention, the following examples are given to describe the novel hindered phenol antioxidants and the preparation thereof in detail.

Example 1

100 g of beta- (3-tert-butyl-4-hydroxy-5-methylphenyl) methyl propionate, 113.45 g of octadecanol and 0.5 g of lithium amide catalyst are sequentially added into a 1000ml clean four-neck flask which is provided with an electric stirring device, a thermometer, a reflux condenser, a vacuum system and a methanol collecting device; preparing an experimental instrument according to experimental requirements, detecting air tightness, replacing for about 20 seconds by using nitrogen, controlling the reaction according to the following process step by step and program, and mainly controlling the vacuum degree and the material temperature in the flask at each stage;

the first stage is as follows: heating, and keeping the reaction for 1 hour within the range of 100-120 ℃ after the temperature reaches 100 ℃; controlling the gauge pressure of the vacuum degree in the reaction bottle: -50 to-80 KPa (relative pressure, the same applies below);

and a second stage: keeping the reaction for about 1.5 hours at the temperature of 120-140 ℃; gauge pressure: -70 to-80 KPa;

and a third stage: keeping the reaction for about 1 hour at the temperature of 140-160 ℃; gauge pressure: -70 to-80 KPa;

a fourth stage: heating to 160 ℃, and keeping the reaction for 0.5 hour at the temperature of 160-170 ℃; gauge pressure is less than or equal to-98 KPa;

the fifth stage: keeping the reaction for 1 hour at the temperature of 170-190 ℃; gradually reducing the pressure to below 600Pa (absolute pressure);

the sixth stage: evaporating and removing methyl beta- (3-tert-butyl-4-hydroxy-5-methylphenyl) propionate and light components, wherein the temperature is as follows: 190-198 ℃, absolute pressure: below 600 Pa;

and (3) crystallization: cooling to below 90 ℃, adding 600ml of ethanol (with the concentration of 96%), and keeping stirring for 5 minutes at 76-82 ℃ to completely dissolve the reaction solution;

keeping stirring, and soaking the reaction flask with water at about 30 ℃ to reduce the temperature of the materials to 46-48 ℃;

replacing the water with the temperature of 45-50 ℃ to soak the reaction bottle and preserving the heat for 5 minutes;

soaking the reaction flask with water at the temperature of about 25 ℃ to reduce the temperature of the materials to 28-30 ℃, and keeping stirring for 30 minutes;

and (4) carrying out suction filtration, washing a filter cake by using 96% ethanol, and collecting solid filter residues to obtain the product.

Weighing: weighing 175.73 g of white powdery novel hindered phenol antioxidant finished product, sending a sample to a laboratory for inspection, and determining the content of the hindered phenol antioxidant as follows: 98.35%, melting point: 58.6-58.9 ℃.

The product was verified by gas chromatography and infrared.

Example 2

100 g of beta- (3-tert-butyl-4-hydroxy-5-methylphenyl) methyl propionate, 102.65 g of octadecanol and 0.3 g of lithium amide catalyst are sequentially added into a 1000ml clean four-neck flask which is provided with an electric stirring device, a thermometer, a reflux condenser, a vacuum system and a methanol collecting device; preparing an experimental instrument according to experimental requirements, detecting air tightness, replacing for about 20 seconds by using nitrogen, controlling the reaction according to the following process step by step and program, and mainly controlling the vacuum degree and the material temperature in the flask at each stage;

the first stage is as follows: heating, and keeping the reaction for 1 hour within the range of 110-120 ℃ after the temperature reaches 110 ℃; controlling the gauge pressure of the vacuum degree in the reaction bottle: -50 to-80 KPa (relative pressure, the same applies below);

and a second stage: keeping the reaction for about 1.5 hours at the temperature of 120-140 ℃; gauge pressure: -70 to-80 KPa;

and a third stage: keeping the reaction for about 1 hour at the temperature of 140-160 ℃; gauge pressure: -70 to-80 KPa;

a fourth stage: heating to 170 ℃, and keeping the reaction for 0.5 hour at the temperature of 170-180 ℃; gauge pressure is less than or equal to-98 KPa;

the fifth stage: keeping the reaction for 1 hour at the temperature of 180-190 ℃; gradually reducing the pressure to below 600Pa (absolute pressure);

the sixth stage: evaporating and removing methyl beta- (3-tert-butyl-4-hydroxy-5-methylphenyl) propionate and light components, wherein the temperature is as follows: 190-198 ℃, absolute pressure: below 600 Pa;

and (3) crystallization: cooling to below 90 ℃, adding 600ml of methanol (with the concentration of 95%), and keeping stirring for 5 minutes at 65-70 ℃ to completely dissolve the reaction solution;

keeping stirring, and soaking the reaction flask with water at about 30 ℃ to reduce the temperature of the materials to 46-48 ℃;

replacing the water with the temperature of 45-50 ℃ to soak the reaction bottle and preserving the heat for 5 minutes;

soaking the reaction flask with water at the temperature of about 25 ℃ to reduce the temperature of the materials to 28-30 ℃, and keeping stirring for 30 minutes;

and (4) carrying out suction filtration, washing a filter cake by using 96% ethanol, and collecting solid filter residues to obtain the product.

Weighing: weighing 180.48 g of white powdery novel hindered phenol antioxidant finished product, sending a sample to a laboratory for inspection, and determining the content of the hindered phenol antioxidant as follows: 99.73%, melting point: 58.9-59.5 ℃.

The product was verified by gas chromatography and infrared.

Example 3

100 g of beta- (3-tert-butyl-4-hydroxy-5-methylphenyl) methyl propionate, 105.89 g of octadecanol, 0.15 g of catalyst lithium amide and 0.15 g of catalyst zinc stearate are sequentially added into a 1000ml clean four-neck flask provided with an electric stirring device, a thermometer, a reflux condenser, a vacuum system and a methanol collecting device; preparing an experimental instrument according to experimental requirements, detecting air tightness, replacing for about 20 seconds by using nitrogen, controlling the reaction according to the following process step by step and program, and mainly controlling the vacuum degree and the material temperature in the flask at each stage;

the first stage is as follows: heating, and keeping the reaction for 1 hour within the range of 120-130 ℃ after the temperature reaches 120 ℃; controlling the gauge pressure of the vacuum degree in the reaction bottle: -50 to-80 KPa (relative pressure, the same applies below);

and a second stage: keeping the reaction for about 1.5 hours at the temperature of 130-140 ℃; gauge pressure: -70 to-80 KPa;

and a third stage: keeping the reaction for about 1 hour at the temperature of 140-160 ℃; gauge pressure: -70 to-80 KPa;

a fourth stage: heating to 160 ℃, and keeping the reaction for 0.5 hour at the temperature of 160-170 ℃; gauge pressure is less than or equal to-98 KPa;

the fifth stage: keeping the reaction for 1 hour at the temperature of 170-190 ℃; gradually reducing the pressure to below 600Pa (absolute pressure);

the sixth stage: evaporating and removing methyl beta- (3-tert-butyl-4-hydroxy-5-methylphenyl) propionate and light components, wherein the temperature is as follows: 190-198 ℃, absolute pressure: below 600 Pa;

and (3) crystallization: cooling to below 90 ℃, adding 600ml of methanol (with the concentration of 95%), and keeping stirring for 5 minutes at 65-70 ℃ to completely dissolve the reaction solution;

keeping stirring, and soaking the reaction flask with water at about 30 ℃ to reduce the temperature of the materials to 46-48 ℃;

replacing the water with the temperature of 45-50 ℃ to soak the reaction bottle and preserving the heat for 5 minutes;

soaking the reaction flask with water at the temperature of about 25 ℃ to reduce the temperature of the materials to 28-30 ℃, and keeping stirring for 30 minutes;

and (4) carrying out suction filtration, washing a filter cake by using 96% ethanol, and collecting solid filter residues to obtain the product.

Weighing: weighing 184.84 g of white powdery novel hindered phenol antioxidant finished product, sending a sample to a laboratory for inspection, and determining the content of the hindered phenol antioxidant as follows: 99.73%, melting point: 58.8-59.5 ℃.

The product was verified by gas chromatography and infrared.

FIG. 1 is a gas chromatogram of the novel hindered phenolic antioxidant prepared in this example;

FIG. 2 is an IR spectrum of the novel hindered phenol antioxidant prepared in this example.

Example 4

100 g of beta- (3-tert-butyl-4-hydroxy-5-methylphenyl) methyl propionate, 110.21 g of octadecanol, 0.1 g of lithium amide catalyst and 0.2 g of zinc stearate catalyst are sequentially added into a 1000ml clean four-neck flask provided with an electric stirring device, a thermometer, a reflux condenser, a vacuum system and a methanol collecting device; preparing an experimental instrument according to experimental requirements, detecting air tightness, replacing for about 20 seconds by using nitrogen, controlling the reaction according to the following process step by step and program, and mainly controlling the vacuum degree and the material temperature in the flask at each stage;

the first stage is as follows: heating, and keeping the reaction for 1 hour within the range of 100-120 ℃ after the temperature reaches 100 ℃; controlling the gauge pressure of the vacuum degree in the reaction bottle: -50 to-80 KPa (relative pressure, the same applies below);

and a second stage: keeping the reaction for about 1.5 hours at the temperature of 120-140 ℃; gauge pressure: -70 to-80 KPa;

and a third stage: keeping the reaction for about 1 hour at the temperature of 140-170 ℃; gauge pressure: -70 to-80 KPa;

a fourth stage: heating to 180 ℃, and keeping the reaction for 0.5 hour at the temperature of 180-185 ℃; gauge pressure is less than or equal to-98 KPa;

the fifth stage: keeping the reaction for 1 hour at the temperature of 185-190 ℃; gradually reducing the pressure to below 600Pa (absolute pressure);

the sixth stage: evaporating and removing methyl beta- (3-tert-butyl-4-hydroxy-5-methylphenyl) propionate and light components, wherein the temperature is as follows: 190-198 ℃, absolute pressure: below 600 Pa;

and (3) crystallization: cooling to below 90 ℃, adding 600ml of ethanol (with the concentration of 96%), and keeping stirring for 5 minutes at 76-82 ℃ to completely dissolve the reaction solution;

keeping stirring, and soaking the reaction flask with water at about 30 ℃ to reduce the temperature of the materials to 46-48 ℃;

replacing the water with the temperature of 45-50 ℃ to soak the reaction bottle and preserving the heat for 5 minutes;

soaking the reaction flask with water at the temperature of about 25 ℃ to reduce the temperature of the materials to 28-30 ℃, and keeping stirring for 30 minutes;

and (4) carrying out suction filtration, washing a filter cake by using 96% ethanol, and collecting solid filter residues to obtain the product.

Weighing: weighing 181.19 g of white powdery novel hindered phenol antioxidant finished product, sending a sample to a laboratory for inspection, and determining the content of the hindered phenol antioxidant as follows: 98.63%, melting point: 58.6-59.2 ℃.

The product was verified by gas chromatography and infrared.

Example 5

100 g of beta- (3-tert-butyl-4-hydroxy-5-methylphenyl) methyl propionate, 99.41 g of octadecanol, 0.2 g of lithium amide catalyst and 0.1 g of zinc stearate catalyst are sequentially added into a 1000ml clean four-neck flask provided with an electric stirring device, a thermometer, a reflux condenser, a vacuum system and a methanol collecting device; preparing an experimental instrument according to experimental requirements, detecting air tightness, replacing for about 20 seconds by using nitrogen, controlling the reaction according to the following process step by step and program, and mainly controlling the vacuum degree and the material temperature in the flask at each stage;

the first stage is as follows: heating, and keeping the reaction for 1 hour within the range of 100-120 ℃ after the temperature reaches 100 ℃; controlling the gauge pressure of the vacuum degree in the reaction bottle: -50 to-80 KPa (relative pressure, the same applies below);

and a second stage: keeping the reaction for about 1.5 hours at the temperature of 120-140 ℃; gauge pressure: -70 to-80 KPa;

and a third stage: keeping the reaction for about 1 hour at the temperature of 140-160 ℃; gauge pressure: -70 to-80 KPa;

a fourth stage: heating to 170 ℃, and keeping the reaction for 0.5 hour at the temperature of 170-180 ℃; gauge pressure is less than or equal to-98 KPa;

the fifth stage: keeping the reaction for 1 hour at the temperature of 180-190 ℃; gradually reducing the pressure to below 600Pa (absolute pressure);

the sixth stage: evaporating and removing methyl beta- (3-tert-butyl-4-hydroxy-5-methylphenyl) propionate and light components, wherein the temperature is as follows: 190-198 ℃, absolute pressure: below 600 Pa;

and (3) crystallization: cooling to below 90 ℃, adding 600ml of ethanol (with the concentration of 96%), and keeping stirring for 5 minutes at 76-82 ℃ to completely dissolve the reaction solution;

keeping stirring, and soaking the reaction flask with water at about 30 ℃ to reduce the temperature of the materials to 46-48 ℃;

replacing the water with the temperature of 45-50 ℃ to soak the reaction bottle and preserving the heat for 5 minutes;

soaking the reaction flask with water at the temperature of about 25 ℃ to reduce the temperature of the materials to 28-30 ℃, and keeping stirring for 30 minutes;

and (4) carrying out suction filtration, washing a filter cake by using 96% ethanol, and collecting solid filter residues to obtain the product.

Weighing: weighing 174.42 g of white powdery novel hindered phenol antioxidant finished product, sending a sample to a laboratory for inspection, and determining the content of the hindered phenol antioxidant as follows: 99.68%, melting point: 58.8-59.4 ℃.

The product was verified by gas chromatography and infrared.

Example 6

Novel antioxidant oxidation resistance verification test

0.1 g of the sample obtained in example 5 is weighed, added to 500 g of polypropylene powder and mixed thoroughly and extruded three times in an SHJ-20 twin-screw extruder, the screw temperature being set at TS 1: 195 ℃, TS2:205 ℃, TS3-TS 9: 210 ℃, TS 10: at 200 ℃. The melt index and yellowness index of each extruded pellet were measured separately and compared with the blank and the same amount of antioxidant 1135 (see table below for test data):

TABLE 1 melt index test results table, g/10min

MR	Blank # 1	1076	EXAMPLE 5 product
				One-time extrusion	7.00	4.98	3.97
Secondary extrusion	8.78	6.06	4.48
				Triple extrusion	10.89	7.09	5.19

TABLE 2 Yellow (YI) index test results table

YI	Blank # 1	1076	EXAMPLE 5 product
				One-time extrusion	-1.22	1.09	0.95
Secondary extrusion	7.58	5.59	3.92
				Triple extrusion	10.81	10.23	4.37

The experimental data show that the product can remarkably stabilize the melt index of polypropylene in multiple processing processes and reduce the color change caused by the phenolic hydroxyl anti-oxidation process in the high-temperature processing process.

The above description of the embodiments is only intended to facilitate the understanding of the method of the invention and its core idea. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.