WO2023036207A1 - High-gloss and good-dispersion polypropylene talcum powder masterbatch, and preparation method therefor and use thereof - Google Patents

Abstract

Disclosed in the present invention are a high-gloss and good-dispersion polypropylene talcum powder masterbatch, and a preparation method therefor and the use thereof. The present invention relates to the technical field of polymer materials. The polypropylene talcum powder masterbatch comprises the following components, in parts by mass: 5-20 parts of a low-melt-index homopolypropylene powder; 2-10 parts of metallocene low-isotacticity polypropylene; 80-95 parts of talcum powder; and 0.1-2 parts of other additives. The metallocene low-isotacticity polypropylene is added to the high-gloss and good-dispersion polypropylene talcum powder masterbatch of the present invention. The fluidity difference between the metallocene low-isotacticity polypropylene phase and the other phases is very large, and it is easy to first inject same into the surface of a mold to form a solidified layer in order to form a high-gloss surface, thereby achieving a relatively high gloss. In addition, the metallocene low-isotacticity polypropylene can be effectively dispersed and combined with talcum powder in the presence of the low-melt-index homopolypropylene powder to achieve a good dispersion effect, and the polypropylene talcum powder masterbatch further has a relatively good resistance to low temperatures.

Description

A kind of high-gloss, well-dispersed polypropylene talcum powder masterbatch and its preparation method and application technical field

The invention relates to the technical field of polymer materials, more specifically, to a high-gloss, well-dispersed polypropylene talcum powder masterbatch, a preparation method and application thereof.

Background technique

The research on polypropylene talcum powder masterbatch mostly focuses on the content of talc powder, carrier type and processing technology, and does not involve the research on high-gloss polypropylene talc powder masterbatch. The dispersibility of polypropylene talcum powder masterbatch will affect the appearance of the back-end process products, so it is necessary to improve the dispersibility, and at the same time, it is required to have good gloss for polypropylene talc powder masterbatch in the specific electrical field. Therefore, it is necessary to improve the polypropylene talc powder The gloss of the masterbatch is also very important.

CN107129634A discloses a preparation method of a highly filled talcum powder masterbatch adding a macromolecular dispersant, comprising the following steps: raw material preparation, each raw material is prepared according to the following weight percentage: matrix resin, 10% to 25%; macromolecular dispersant, 2% to 10%; additives, 1% to 5%; talcum powder 70% to 85%; premixing of raw materials, premixing matrix resin, macromolecular dispersant and additives in a mixer; talcum powder masterbatch Preparation, adding talcum powder and the above-mentioned premixed raw materials into the internal mixer for banburying, so that the talc powder and the matrix resin are fully mixed; after the banburying is completed, extrude and granulate through a single-screw or twin-screw extruder; extrude The granules are screened and cooled by a vibrating sieve, and then cooled by air conveying equipment to obtain high-filling talcum powder masterbatches. The highly filled talcum powder masterbatch prepared by the method disclosed in the above technology improves the dispersibility of the talcum powder masterbatch, but its talc powder content can only be increased to 70-85%, which does not achieve a good dispersion effect, and the single The extrusion temperature of the screw or twin-screw extruder is 180-230°C, the temperature is high, and the color of the obtained talcum powder masterbatch is dark, which is not conducive to the downstream production of natural or white products, and is also not conducive to the surface of the talc powder masterbatch Gloss improvement.

Contents of the invention

The technical problem to be solved by the present invention is to overcome the defects and deficiencies of the existing polypropylene talcum powder master batches of poor dispersibility and gloss, and provide a high-gloss, well-dispersed polypropylene talc powder master batch.

The purpose of the invention is to provide a method for preparing high-gloss, well-dispersed polypropylene talcum powder masterbatch.

Another object of the present invention is to provide a high-gloss, well-dispersed polypropylene talc masterbatch used in the preparation of electrical appliances and electronic appliances.

The above object of the present invention is achieved through the following technical solutions:

A high-gloss, well-dispersed polypropylene talc masterbatch, comprising the following components in parts by mass:

Homopolymer low-melt refers to 5-20 parts of polypropylene powder;

2-10 parts of metallocene low-isotactic polypropylene;

80-95 parts of talcum powder;

0.1 to 2 parts of other additives,

Homopolymerized low-melt polypropylene powder refers to homopolymerized polypropylene powder with a melt flow rate of 0.5-5g/10min measured at 230°C/2.16kg according to the ISO1133-2011 method;

The metallocene low isotactic polypropylene is a metallocene polypropylene with an isotacticity of 55-65%. According to the ISO1133-2011 method, the melt flow rate measured at 230°C/2.16kg is 500-3000g/10min.

Due to the addition of a small amount of metallocene low-isotactic polypropylene to the polypropylene talcum powder masterbatch of the present invention, when the talcum powder masterbatch is injected, the difference in melt flow rate between the metallocene low-isotactic polypropylene phase and other phases in the melt Very large, easy to be injected onto the surface of the mold first to form a solidified layer to form a high-gloss surface to achieve a higher gloss.

At the same time, the metallocene low-isotactic polypropylene added to the polypropylene talcum powder masterbatch of the present invention also has better low temperature resistance, and can be widely used in the fields of household appliances and electronic appliances.

The addition amount of metallocene low isotactic polypropylene in the polypropylene talcum powder masterbatch of the present invention is very critical, if the addition amount of metallocene low isotactic polypropylene is too low, the realization of its high gloss and good dispersion effect cannot be achieved , Too much addition of metallocene low-isotactic polypropylene will affect the low-temperature impact performance of polypropylene talcum powder masterbatch, and it does not have good low-temperature resistance.

Preferably, the following components are included in parts by mass:

Homopolymer low-melt refers to 8-15 parts of polypropylene powder;

5-8 parts of metallocene low-isotactic polypropylene;

88-92 parts of talcum powder;

0.5-2 parts of other additives.

Preferably, the homopolymerized low-melting polypropylene powder is a homopolymerized polypropylene with a melt flow rate of 3-4 g/10 min measured under the condition of 230° C./2.16 kg according to the ISO1133-2011 method.

Preferably, the metallocene low-isotactic polypropylene is a metallocene polypropylene with an isotacticity of 60-63%, and the melt flow rate measured under the condition of 230°C/2.16kg is 2000-63% according to the ISO1133-2011 method. 2500g/10min.

Preferably, the particle diameter of the talc powder is 8-20 μm. The particle size of talc powder has a certain influence on the overall dispersibility. The particle size of talc powder below 10 μm is too fine, which is easy to agglomerate and affects the dispersibility. Similarly, too large particle size is not conducive to the uniform dispersion of the whole, and finally affects the polypropylene talc powder master. The dispersibility and gloss of the particles will also reduce the low-temperature Izod notched impact strength.

Further preferably, the particle size of the talc powder is 10-15 μm.

Preferably, the other additives include 0.2-1 part of antioxidant and 0.3-1 part of lubricant.

Among them, what needs to be explained is:

The antioxidant can be a mixture of hindered phenolic primary antioxidant and phosphite or thioether secondary antioxidant.

Other additives also include other processing aids, such as metal soaps, stearic acid complex esters, amides, or a mixture of two or more.

The present invention also specifically protects a method for preparing a high-gloss, well-dispersed polypropylene talcum powder masterbatch, comprising the following steps:

S1. Add homopolymer low-melting polypropylene powder, metallocene low-isotactic polypropylene, talcum powder and other additives into the internal mixer, and mix uniformly to obtain a mixture;

S2. The above mixture is fed into the twin-screw extruder through main feeding and double-side feeding at the same time, extruded and pelletized to obtain polypropylene talcum powder masterbatch.

What needs to be explained is:

The extrusion granulation temperature of the present invention is 150～170 ℃,

The current powder feeding capacity of the current granulator is limited, about 80-100kg/h, and the raw material will overflow only through internal mixing. The problem of powder return is solved, and the problem of powder pollution to the environment is solved at the same time.

Further preferably, the feed mass percentage of the main feed is 55-70%, and the feed mass percentage of the double-side feed is 30-45%.

The application of the high-gloss and well-dispersed polypropylene talcum powder masterbatch of the present invention in the preparation of household appliances and electronic appliances is also within the protection scope of the present invention.

The polypropylene talcum powder masterbatch of the present invention not only has high gloss on the surface, but also has good dispersibility with talcum powder, and also has low temperature resistance, and can be widely used in the fields of household appliances and electronic appliances.

Compared with prior art, the beneficial effect of the present invention is:

The invention discloses a high-gloss, well-dispersed polypropylene talcum powder masterbatch. Metallocene low-isotactic polypropylene is added to the masterbatch. The fluidity difference between the metallocene low-isotactic polypropylene phase and other phases is very large. Yi is the first to be injected onto the surface of the mold to form a coagulated layer to form a high-gloss surface to achieve high gloss. At the same time, the synergistic effect of homopolymerized low-melting polypropylene powder and metallocene low-isotactic polypropylene can also be effectively improved. Low temperature notched impact properties of polypropylene talc masterbatches.

The glossiness of the polypropylene talcum powder masterbatch of the present invention can reach 62.1, which can realize the first-level dispersion effect, has good dispersion and high gloss, and the notched impact strength of the polypropylene talc powder masterbatch at -40°C can reach up to 3.45kJ /m ² , has good low temperature toughness.

Detailed ways

The present invention will be further described below in combination with specific embodiments, but the examples do not limit the present invention in any form. Unless otherwise specified, the raw material reagents used in the examples of the present invention are conventionally purchased raw material reagents.

Wherein, the glossiness, dispersion coefficient and -40 ℃ notched impact strength of the embodiment of the present invention and comparative example, the test method of kJ/ ^m2 is as follows:

Dispersion coefficient: The polypropylene talcum powder masterbatch is made into a 100mm*100mm*1mm square plate on a mold that is polished on the surface, and the surface is observed by a secondary element phase instrument, and 2mm* is quantified by the secondary element phase instrument The number of dark spots appearing on an area of 2 mm is divided into 10 grades according to the number of dark spots on the surface, of which grade 1 is the best, grade 10 is the worst, and the number of black spots in grade 1 is less than 2. Grade 2-10, the number of black spots Within 4, within 6, within 8, within 10, within 12, within 14, within 16, within 18 and greater than 18.

Glossiness: According to the standard GB/T 8807-1988, the degree to which the surface of an object represented by numbers is close to a mirror surface. Gloss can be evaluated using a gloss meter, which mainly depends on the angle of light source illumination and observation. Instrument measurement usually uses 20°, 45°, 60° or 85° angle illumination, mainly 60° angle. Test method: Use a gloss meter to place it flat on a square plate of 2.0mm*100mm*100mm, and read out the glossiness data at 60° directly.

-40℃ Notched Izod Impact Strength, kJ/m ² : According to the standard GB/T 1843-2008, the polypropylene talcum powder masterbatch is injection molded into 80mm*10mm*4mm notched Izod impact splines, and then the splines are placed into a forced convection oven at a temperature of -40°C to test the low-temperature Izod notched impact strength.

Each raw material information of the present invention is specified as follows:

Homopolymerization refers to polypropylene powder, according to the ISO1133-2011 method, the melt flow rate measured under the condition of 230 ° C / 2.16 kg is 15 g / 10 min, purchased from Baling Petrochemical, the brand is PP 150 (powder);

Homopolymer low melting refers to polypropylene powder A, according to the ISO1133-2011 method, the melt flow rate measured under the condition of 230 ℃/2.16kg is 3g/10min, purchased from China Shipping Shell, the brand is PP HP550J;

Homopolymer low-melt refers to polypropylene powder B, according to the ISO1133-2011 method, the melt flow rate measured under the condition of 230 ℃/2.16kg is 4g/10min, purchased from Shenhuaning Coal, the brand is PP 1102K;

Homopolymer low melting refers to polypropylene powder C, according to the ISO1133-2011 method, the melt flow rate measured under the condition of 230 ℃/2.16kg is 0.6g/10min, purchased from Taiwan Petrochemical, the brand is PP B1101;

Homopolymer low-melt refers to polypropylene powder D, according to the ISO1133-2011 method, the melt flow rate measured under the condition of 230°C/2.16kg is 5g/10min, purchased from Repsol, the brand is PP 050;

Metallocene low-isotactic polypropylene A is a metallocene polypropylene with an isotacticity of 60%. According to the ISO1133-2011 method, the melt flow rate measured at 230°C/2.16kg is 2000g/10min, purchased from Japan Idemitsu , the grade is L-MODU S400;

Metallocene low-isotactic polypropylene B is a metallocene polypropylene with an isotacticity of 63%. According to the ISO1133-2011 method, the melt flow rate measured at 230°C/2.16kg is 2500g/10min, purchased from Japan Idemitsu , the grade is L-MODU S600;

Metallocene low isotactic polypropylene C is a metallocene polypropylene with an isotacticity of 55%. According to the ISO1133-2011 method, the melt flow rate measured at 230°C/2.16kg is 800g/10min, purchased from Japan Idemitsu , the grade is PP T500;

Metallocene low-isotactic polypropylene D is a metallocene polypropylene with an isotacticity of 65%. According to the ISO1133-2011 method, the melt flow rate measured at 230°C/2.16kg is 3000g/10min, purchased from Japan Idemitsu , the grade is L-MODU S901;

Metallocene low-isotacticity polypropylene E is a metallocene polypropylene with an isotacticity of 68%. According to the ISO1133-2011 method, the melt flow rate measured at 230°C/2.16kg is 10g/10min, purchased from Yanshan Petrochemical , the grade is PP C5608M;

Metallocene low-isotactic polypropylene F is a metallocene polypropylene with an isotacticity of 50%. According to the ISO1133-2011 method, the melt flow rate measured at 230°C/2.16kg is 1400g/10min, purchased from Japan Idemitsu , the grade is L-MODU S410;

Talc powder A is purchased from Huamei talc, the brand is AH-1250N6, and the particle size D50 is 10-15 μm;

Talc powder B is purchased from Longguang talc, the brand is TY90-20-A, and the particle size D50 is 16-20 μm;

Antioxidant is antioxidant Y-001, purchased from Yingkou scenery;

The lubricant is Lubricant-EBS HI-LUBE, purchased from Xinyuan, Korea.

Examples 1-12

A high-gloss, well-dispersed polypropylene talc masterbatch, comprising the following components in parts by mass in Table 1.

The preparation method of high-gloss, well-dispersed polypropylene talcum powder masterbatch specifically comprises the following steps:

S1. Add homopolymerized low-melting polypropylene powder, metallocene low-isotactic polypropylene, talcum powder and other additives to the internal mixer and banbury for 20 minutes, and mix uniformly to obtain a mixture;

S2. The mixture of 60% by mass is mainly fed into the twin-screw extruder through a forced feeder, and the mixture of 40% by mass is fed into the twin-screw extruder by double-side feeding, Extruded together and granulated to obtain polypropylene talcum powder masterbatch.

Table 1

Comparative example 1

A kind of polypropylene talcum powder master batch, comprises the following components in parts by mass:

Metallocene low isotactic polypropylene A6 parts; talcum powder A90 parts, antioxidant 0.2 parts, lubricant 0.3 parts.

The preparation method of polypropylene talcum powder masterbatch specifically comprises the steps:

S1. Add metallocene low-isotactic polypropylene, talcum powder and other additives to a low-speed mixer and banbury for 20 minutes, and mix evenly to obtain a mixture;

S2. The mixture of 60% by mass is mainly fed into the twin-screw extruder through a forced feeder, and the mixture of 40% by mass is fed into the twin-screw extruder by double-side feeding, Extruded together and granulated to obtain polypropylene talcum powder masterbatch.

Comparative example 2

A kind of polypropylene talcum powder master batch, comprises the following components in parts by mass:

Homopolymer low-melting refers to 10 parts of polypropylene powder A; 90 parts of talc powder A, 0.2 part of antioxidant, and 0.3 part of lubricant.

The preparation method of polypropylene talcum powder masterbatch specifically comprises the steps:

S1. Add homopolymerized low-melting polypropylene powder, talcum powder and other additives to a low-speed mixer for banburying for 20 minutes, and mix evenly to obtain a mixture;

S2. The mixture of 60% by mass is mainly fed into the twin-screw extruder through a forced feeder, and the mixture of 40% by mass is fed into the twin-screw extruder by double-side feeding, Extruded together and granulated to obtain polypropylene talcum powder masterbatch.

Comparative example 3

A kind of polypropylene talcum powder master batch, comprises the following components in parts by mass:

Homopolymerization medium melting refers to 10 parts of polypropylene powder, 6 parts of metallocene low-isotactic polypropylene A, 90 parts of talc powder A, 0.2 parts of antioxidant, and 0.3 parts of lubricant.

The preparation method of polypropylene talcum powder masterbatch specifically comprises the steps:

S1. Add homopolymer ultra-high melting index polypropylene, metallocene low-isotactic polypropylene, talcum powder and other additives to a low-speed mixer for banburying for 20 minutes, and mix uniformly to obtain a mixture;

S2. The mixture of 60% by mass is mainly fed into the twin-screw extruder through a forced feeder, and the mixture of 40% by mass is fed into the twin-screw extruder by double-side feeding, Extruded together and granulated to obtain polypropylene talcum powder masterbatch.

Comparative example 4～9

A kind of polypropylene talcum powder masterbatch, comprises the component of following table 2 mass parts.

The preparation method of high-gloss, well-dispersed polypropylene talcum powder masterbatch specifically comprises the following steps:

S1. Add homopolymerized low-melting polypropylene powder, metallocene low-isotactic polypropylene, talcum powder and other additives to a low-speed mixer and banbury for 20 minutes, and mix evenly to obtain a mixture;

S2. The mixture of 60% by mass is mainly fed into the twin-screw extruder through a forced feeder, and the mixture of 40% by mass is fed into the twin-screw extruder by double-side feeding, Extruded together and granulated to obtain polypropylene talcum powder masterbatch.

Table 2

the	Comparative example 4	Comparative example 5	Comparative example 6	Comparative example 7	Comparative example 8	Comparative example 9
Homopolymer Low Melt Polypropylene Powder A	4	twenty two	20	5	10	10
Metallocene low isotactic polypropylene A	11	1	10	2	the	the
Metallocene low isotactic polypropylene E	the	the	the	the	6	the
Metallocene low isotactic polypropylene F	the	the	the	the	the	6
Talc A	90	90	78	96	90	90
antioxidant	0.2	0.2	1	0.05	0.2	0.2
lubricant	0.3	0.3	1	0.05	0.3	0.3

Result detection

The test results of the above-mentioned examples and comparative examples are specifically shown in Table 3 below.

table 3

serial number	Gloss	Dispersion coefficient	-40℃ Notched Izod Impact Strength, kJ/m 2
Example 1	62.1	1	3.45
Example 2	58.2	2	3.13
Example 3	48.9	3	2.98
Example 4	51.2	3	3.01
Example 5	57.9	2	3.08
Example 6	45.6	4	2.87
Example 7	46.3	5	2.94
Example 8	41.3	8	2.12
Example 9	44.2	7	2.45

Example 10	44.1	7	2.38
Example 11	36.3	8	2.01
Example 12	45.1	6	2.54
Comparative example 1	18.9	8	1.07
Comparative example 2	19.2	8	1.06
Comparative example 3	35.2	8	1.96
Comparative example 4	34.9	8	1.87
Comparative example 5	33.2	9	1.76
Comparative example 6	28.0	8	3.53
Comparative example 7	26.8	9	1.65
Comparative example 8	28.9	8	1.94
Comparative example 9	29.5	9	1.86

As can be seen from the data in the above table 3, the polypropylene talcum powder masterbatch of the present invention can achieve higher gloss after injection molding, and the gloss value of the embodiment can reach 62.1 at the highest. From the comparison of embodiment 1 and comparative example 3 , and the comparison of Example 1 and Comparative Examples 8 and 9, it can be seen that the synergistic effect of each component of the polypropylene talcum powder masterbatch of the present invention is quite remarkable, and it is not within the protection scope of the present invention, and all will cause final The gloss, dispersion coefficient and low temperature toughness of the masterbatch material decreased significantly in -40°C notched Izod impact strength. The comparison of Example 1 and Comparative Examples 4-7 shows the importance of the compatibility of the components of the polypropylene talcum powder masterbatch of the present invention. Changing the relevant compatibility can not achieve the specific technical effect of the present invention, and cannot obtain high gloss. High degree and good dispersibility of polypropylene talc masterbatch. The low temperature toughness of the present invention cannot be achieved either.

Apparently, the above-mentioned embodiments of the present invention are only examples for clearly illustrating the present invention, rather than limiting the implementation of the present invention. For those of ordinary skill in the art, other changes or changes in different forms can be made on the basis of the above description. It is not necessary and impossible to exhaustively list all the implementation manners here. All modifications, equivalent replacements and improvements made within the spirit and principles of the present invention shall be included within the protection scope of the claims of the present invention.

Claims (10)

1. A high-gloss, well-dispersed polypropylene talc masterbatch is characterized in that it comprises the following components in parts by mass:

   Homopolymer low-melt refers to 5-20 parts of polypropylene powder;

   2-10 parts of metallocene low-isotactic polypropylene;

   80-95 parts of talcum powder;

   0.1 to 2 parts of other additives,

   Homopolymerized low-melt polypropylene powder refers to homopolymerized polypropylene powder with a melt flow rate of 0.5-5g/10min measured at 230°C/2.16kg according to the ISO1133-2011 method;

   The metallocene low isotactic polypropylene is a metallocene polypropylene with an isotacticity of 55-65%. According to the ISO1133-2011 method, the melt flow rate measured at 230°C/2.16kg is 500-3000g/10min.
2. High gloss as claimed in claim 1, good disperse polypropylene talcum powder masterbatch, it is characterized in that, comprise the following components in parts by mass:

   Homopolymer low-melt refers to 8-15 parts of polypropylene powder;

   5-8 parts of metallocene low-isotactic polypropylene;

   88-92 parts of talcum powder;

   0.5-2 parts of other additives.
3. The high-gloss and well-dispersed polypropylene talc masterbatch according to claim 1, wherein the homopolymerized low-melt polypropylene powder is a melt measured at 230°C/2.16kg according to the ISO1133-2011 method Homopolypropylene with a flow rate of 3-4g/10min.
4. The high-gloss and well-dispersed polypropylene talc masterbatch according to claim 1, wherein the metallocene low-isotacticity polypropylene is a metallocene polypropylene with an isotacticity of 60 to 63%, according to ISO1133- 2011 method, the melt flow rate measured under the condition of 230℃/2.16kg is 2000-2500g/10min.
5. The high-gloss and well-dispersed polypropylene talcum powder master batch according to claim 1, wherein the particle diameter D50 of the talc powder is 8-20 μm.
6. The high-gloss, well-dispersed polypropylene talcum powder master batch according to claim 1, wherein the particle diameter D50 of the talc powder is 10-15 μm.
7. The high-gloss, well-dispersed polypropylene talc masterbatch according to claim 1, wherein said other additives include 0.2-1 part of antioxidant and 0.3-1 part of lubricant.
8. A kind of preparation method of high gloss described in any one of claims 1～7, good dispersion polypropylene talcum powder master batch, is characterized in that, comprises the steps:

   S1. Add homopolymer low-melting polypropylene powder, metallocene low-isotactic polypropylene, talcum powder and other additives into the internal mixer, and mix uniformly to obtain a mixture;

   S2. Feed the above mixture into the twin-screw extruder through main feeding and double-side feeding at the same time, extrude and pelletize to obtain polypropylene talcum powder masterbatch.
9. The preparation method of high-gloss, well-dispersed polypropylene talcum powder masterbatch as claimed in claim 8, is characterized in that, the feed mass percent of described main feed is 55～70%, and the feed mass percent of double-side feed is 30% ~45%.
10. An application of the high-gloss and well-dispersed polypropylene talcum powder masterbatch described in any one of claims 1 to 7 in the preparation of household appliances and electronic appliances.