CN114181455B

CN114181455B - Extinction antistatic material for CPP casting film and preparation method thereof

Info

Publication number: CN114181455B
Application number: CN202111449440.1A
Authority: CN
Inventors: 王勇
Original assignee: Guangdong Jishuo New Materials Co ltd
Current assignee: Guangdong Jishuo New Materials Co ltd
Priority date: 2021-11-30
Filing date: 2021-11-30
Publication date: 2023-08-29
Anticipated expiration: 2041-11-30
Also published as: CN114181455A

Abstract

The invention belongs to the technical field of extinction antistatic materials, and provides an extinction antistatic material for a CPP casting film and a preparation method thereof, wherein the extinction antistatic material for the CPP casting film comprises the following raw materials in parts by weight: 30-60 parts of PP resin, 20-70 parts of extinction modifier, 5-20 parts of ultrafine graphite, 0.2-2 parts of antioxidant, 0.5-5 parts of coupling agent and 0.2-2 parts of dispersion lubricant; wherein the extinction modifier is at least one of light calcium carbonate and superfine silicon dioxide. The extinction antistatic material for the CPP casting film is prepared by adding the extinction modifier and the superfine graphite into PP resin and then matching with other auxiliary agents, so that the extinction performance and antistatic performance of the material are effectively improved.

Description

Extinction antistatic material for CPP casting film and preparation method thereof

Technical Field

The invention relates to the technical field of extinction antistatic materials, in particular to an extinction antistatic material for a CPP casting film and a preparation method thereof.

Background

The polypropylene film, PP film for short, has the features of light weight, moistureproof, high mechanical strength, high size stability, no toxicity, no odor, etc. and may be used widely in packing cigarette, food and farm and sideline products. PP films are largely classified into CPP cast films, BOPP films, and IPP films. Wherein, the CPP casting film is a non-stretching non-directional casting film produced by melt casting quenching, and has two modes of single-layer casting and multi-layer co-extrusion casting; compared with blown film, the CPP cast film has the characteristics of high production speed, high yield and uniform transparency and thickness of the film, so the CPP cast film is most widely applied.

Currently, in order to meet the market demand for PP films with low gloss, researchers have developed matting materials for PP films, such as a matting material for BOPP films provided in publication No. CN111909435 a. However, the existing matt PP film has poor antistatic properties. Therefore, there is a need to develop a matt antistatic material for CPP casting films having both excellent matt properties and antistatic properties to further expand the application range of PP films, especially CPP casting films.

Disclosure of Invention

One of the purposes of the present invention is to provide a extinction antistatic material for CPP casting film, which has excellent extinction performance and antistatic performance, aiming at the defects of the prior art.

The second purpose of the invention is to provide a preparation method of the extinction antistatic material for the CPP casting film, which has stable preparation process and low production cost and is suitable for mass production, aiming at the defects of the prior art.

Based on the above, the invention discloses a extinction antistatic material for a CPP casting film, which comprises the following raw materials in parts by weight:

wherein the extinction modifier is at least one of light calcium carbonate and superfine silicon dioxide. Among them, the particle size of the ultrafine silica is preferably 1um, and the particle size of the ultrafine graphite is preferably 1um.

Preferably, the extinction modifier is light calcium carbonate, the addition amount of the light calcium carbonate is 26-35% of the mass of the PP resin, and the mass ratio of the light calcium carbonate to the superfine graphite is 3:0.9 to 1.2.

Further preferably, the mass ratio of the light calcium carbonate to the ultrafine graphite is 3:1.

preferably, the extinction modifier is superfine silicon dioxide, the addition amount of the superfine silicon dioxide is 26-35% of the mass of the PP resin, and the mass ratio of the superfine silicon dioxide to the superfine graphite is 3:1.8 to 2.5.

Further preferably, the mass ratio of the superfine silica to the superfine graphite is 3:2.

still more preferably, the extinction antistatic material for the CPP casting film comprises the following raw materials in parts by weight:

preferably, the extinction modifier is a composite of light calcium carbonate and superfine silica; wherein, the mass ratio of the superfine graphite, the light calcium carbonate and the superfine silicon dioxide is preferably 0.5-0.65: 1:1 to 1.5.

According to the extinction antistatic material for the CPP casting film, the extinction modifier (namely light calcium carbonate and/or superfine silica) and superfine graphite and other auxiliary agents are added into the PP resin, the mass ratio of the superfine silica or the superfine silica in the PP resin is controlled, and the mass ratio of different types of extinction modifiers to the superfine graphite is controlled, so that the input amount and cost of the extinction modifier and the superfine graphite can be properly controlled, the extinction degree and the surface resistance of the extinction antistatic material for the CPP casting film are greatly reduced, and the extinction performance and the antistatic performance of the extinction antistatic material are greatly improved.

The invention also discloses a preparation method of the extinction antistatic material for the CPP casting film, which comprises the following preparation steps:

step S1, mixing a extinction modifier, ultrafine graphite and a coupling agent, and uniformly stirring to obtain a first mixed material;

s2, adding an antioxidant and a dispersing lubricant into the first mixed material, and uniformly stirring to obtain a second mixed material;

step S3, adding PP resin into the second mixed material, and uniformly stirring to obtain a third mixed material;

and S4, placing the third mixed material into an extruder for extrusion granulation to obtain the extinction antistatic material for the CPP casting film.

Preferably, the stirring rate of the first mixed material prepared in the step S1 and the stirring rate of the second mixed material prepared in the step S2 are 320-380 rpm, and the stirring time is 3-8 minutes;

in the step S3, the stirring speed of the third mixed material is 450-500 rpm, and the stirring time is 3-8 minutes.

Preferably, in the step S4, the process conditions of the extrusion granulation are as follows:

the temperature of each zone of the extruder is as follows: the temperature of the first region is 145-155 ℃, the temperature of the second region is 175-185 ℃, the temperatures of the third region to the seventh region are 185-195 ℃, the temperatures of the eighth region to the tenth region are 195-205 ℃, and the temperature of the machine head is 205-215 ℃;

in the extrusion granulation process, the screw rotating speed is 285-315 rpm, the feeding rotating speed is 30-50 rpm, the rotating speed of the granulator is 25-40 rpm, the vacuum degree is less than or equal to 0.1Mpa, and the temperature of the water tank is 30-50 ℃.

Compared with the prior art, the invention at least comprises the following beneficial effects:

in the extinction antistatic material for the CPP casting film, the PP resin is used as a main resin, the coupling agent, the antioxidant and the dispersing wetting agent are used as auxiliary agents, the light calcium carbonate and/or the superfine silicon dioxide are used as extinction modifiers, the superfine graphite is used as an antistatic modifier and an auxiliary extinction modifier, and under the cooperation of the main resin and various auxiliary agents, the light calcium carbonate and/or the superfine silicon dioxide and the superfine graphite exert a synergistic effect so as to greatly reduce the glossiness and the surface resistance of the extinction antistatic material for the CPP casting film, and further effectively improve the extinction performance and the antistatic performance of the extinction antistatic material for the CPP casting film. Wherein, the extinction degree of the extinction antistatic material for the CPP casting film can be reduced to below 10, and the surface resistance of the extinction antistatic material can reach 1 multiplied by 10 ⁷ Ω。

Detailed Description

In order that the above-recited objects, features and advantages of the present invention will become more apparent, a more particular description of the invention will be rendered by reference to specific embodiments thereof.

Among them, the PP resin used in the following examples was PP F800E of petrochemical company limited, shanghai, petrochemical industry, china unless otherwise specified.

Example 1

The extinction antistatic material for the CPP casting film comprises the following raw materials in parts by weight:

the preparation method of the extinction antistatic material for the CPP casting film comprises the following preparation steps:

and S1, mixing the extinction modifier, the superfine graphite and the coupling agent, and stirring for 5 minutes at 350 revolutions per minute to obtain a first mixed material.

And S2, adding an antioxidant and a dispersing lubricant into the first mixed material, and stirring for 5 minutes at the speed of 350 revolutions per minute to obtain a second mixed material.

And step S3, adding PP resin into the second mixed material, and stirring for 5 minutes at 480 revolutions per minute to obtain a third mixed material.

Wherein, the process conditions of extrusion granulation in the step S4 are as follows:

the temperatures of the various zones of the extruder are as follows: the temperature of the first area is 150 ℃, the temperature of the second area is 180 ℃, the temperatures of the third area to the seventh area are 190 ℃, the temperatures of the eighth area to the tenth area are 200 ℃, and the temperature of the machine head is 210 ℃;

in the extrusion granulation process, the rotating speed of a screw is 300 revolutions per minute, the rotating speed of a feeding is 40 revolutions per minute, the rotating speed of a granulator is 35 revolutions per minute, the vacuum degree is less than or equal to 0.1Mpa, and the temperature of a water tank is 40 ℃.

Example 2

a preparation method of a matt antistatic material for CPP casting film of this example refers to example 1.

Example 3

Example 4

and S1, mixing the extinction modifier, the superfine graphite and the coupling agent, and stirring for 8 minutes at 380 revolutions per minute to obtain a first mixed material.

And S2, adding an antioxidant and a dispersing lubricant into the first mixed material, and stirring for 8 minutes at 380 revolutions per minute to obtain a second mixed material.

And step S3, adding PP resin into the second mixed material, and stirring for 8 minutes at 500 revolutions per minute to obtain a third mixed material.

the temperatures of the various zones of the extruder are as follows: the temperature of the first area is 155 ℃, the temperature of the second area is 185 ℃, the temperatures of the third area to the seventh area are 195 ℃, the temperatures of the eighth area to the tenth area are 205 ℃, and the temperature of the machine head is 215 ℃;

in the extrusion granulation process, the screw rotating speed is 315 rpm, the feeding rotating speed is 50 rpm, the granulator rotating speed is 40 rpm, the vacuum degree is less than or equal to 0.1Mpa, and the water tank temperature is 50 ℃.

Example 5

a preparation method of a matt antistatic material for CPP casting film of this example is referred to example 4.

Example 6

The extinction antistatic material for CPP casting film and the preparation method thereof refer to the embodiment 1, and the difference from the embodiment 1 is that:

15 parts of superfine silica in the extinction antistatic material for the CPP casting film of the embodiment is changed into 15 parts of light calcium carbonate, and the addition amount of superfine graphite is changed into 5 parts.

Example 7

Example 8

Example 9

Example 10

Example 11

and S1, mixing the extinction modifier, the ultrafine graphite and the coupling agent, and stirring for 3 minutes at 320 revolutions per minute to obtain a first mixed material.

And S2, adding an antioxidant and a dispersing lubricant into the first mixed material, and stirring for 3 minutes at 320 revolutions per minute to obtain a second mixed material.

And step S3, adding PP resin into the second mixed material, and stirring for 3 minutes at 450 revolutions per minute to obtain a third mixed material.

the temperatures of the various zones of the extruder are as follows: the temperature of the first region is 145 ℃, the temperature of the second region is 175 ℃, the temperatures of the third region to the seventh region are 185 ℃, the temperatures of the eighth region to the tenth region are 195 ℃, and the temperature of the machine head is 205 ℃;

in the extrusion granulation process, the screw rotating speed is 285 rpm, the feeding rotating speed is 30 rpm, the rotating speed of the granulator is 25 rpm, the vacuum degree is less than or equal to 0.1Mpa, and the water tank temperature is 30 ℃.

Comparative example 1

A matting antistatic material for CPP casting film of this comparative example and a method for preparing the same are all referred to example 1, which differs from example 1 in that: the extinction modifier and the ultrafine graphite are not added in the extinction antistatic material for the CPP casting film of the comparative example.

Comparative example 2

A matting antistatic material for CPP casting film of this comparative example and a method for preparing the same are all referred to example 1, which differs from example 1 in that: no ultrafine graphite was added to the extinction antistatic material for CPP casting film of this comparative example.

Comparative example 3

A matting antistatic material for CPP casting film of this comparative example and a preparation method thereof are all referred to example 6, which differs from example 6 in that: no ultrafine graphite was added to the extinction antistatic material for CPP casting film of this comparative example.

Performance testing

CPP casting films with thickness of 40um prepared by adopting the extinction antistatic materials for CPP casting films of examples 1-11 and comparative examples 1-3 are respectively subjected to performance test, wherein the reference standard of each performance test is as follows: gloss level: GB/T8807-1988; surface resistance: GB/T10064-2006, test results are shown in tables 1-2 below:

TABLE 1

Sample of	Gloss level	Surface resistance (omega)
			Comparative example 1	65	1×10 ¹⁴
Example 1	8	1×10 ⁷
			Example 2	9.5	0.7×10 ⁷
Example 3	7.6	0.83×10 ⁷
			Example 4	7.8	2.1×10 ⁷
Example 5	8.1	0.9×10 ⁷
			Example 6	9	1×10 ⁸
Example 7	9.8	0.86×10 ⁸
			Example 8	8.3	1.1×10 ⁸
Example 9	7.5	1.3×10 ⁹
			Example 10	7.2	6.3×10 ⁷
Example 11	6.5	3.8×10 ⁷

As is clear from Table 1, the extinction and surface resistance of the CPP cast film extinction antistatic materials of examples 1 to 11 are both significantly reduced, and the extinction and antistatic properties are both improved well, as compared with the CPP cast film extinction antistatic material of comparative example 1, in which no extinction modifier and ultrafine graphite are added.

TABLE 2

As is clear from table 2, compared with comparative example 2 (which does not contain ultrafine graphite), the surface resistance of the matting antistatic material for CPP casting film of example 1 (which contains 10 parts of ultrafine graphite) is greatly reduced, the antistatic performance is significantly improved, and the gloss of the matting antistatic material for CPP casting film of example 1 is also significantly reduced, which means that the ultrafine silica and the ultrafine graphite in the matting antistatic material for CPP casting film of example 1 can synergistically improve, thereby achieving the effect of further improving the matting performance.

Similarly, compared with comparative example 3 (which is not added with ultrafine graphite), the surface resistance of the extinction antistatic material for CPP casting film of example 6 (which is added with 5 parts of ultrafine graphite) is also greatly reduced, the antistatic performance is obviously improved, and the glossiness of the extinction antistatic material for CPP casting film of example 6 is also obviously reduced, which shows that the light calcium carbonate and the ultrafine graphite in the extinction antistatic material for CPP casting film of example 6 can also synergistically improve, thereby achieving the effect of further improving the extinction performance.

In summary, in the extinction antistatic material for the CPP casting film, the extinction performance and antistatic performance of the extinction antistatic material for the CPP casting film can be greatly improved by adding the extinction modifier (namely light calcium carbonate and/or superfine silica) and superfine graphite into the PP resin and then matching with other auxiliary agents.

While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiment and all such alterations and modifications as fall within the scope of the embodiments of the invention.

The foregoing has outlined rather broadly the more detailed description of the invention in order that the detailed description of the invention that follows may be better understood, and in order that the present principles and embodiments may be better understood; meanwhile, as those skilled in the art will have variations in the specific embodiments and application scope in accordance with the ideas of the present invention, the present description should not be construed as limiting the present invention in view of the above.

Claims

1. The extinction antistatic material for the CPP casting film is characterized by comprising the following raw materials in parts by weight:

30 to 60 parts of PP resin

10 to 40 parts of extinction modifier

5-20 parts of superfine graphite

0.2 to 2 portions of antioxidant

0.5 to 5 portions of coupling agent

0.2-2 parts of dispersing lubricant;

the extinction modifier is superfine silicon dioxide, the addition amount of the superfine silicon dioxide is 26-35% of the mass of the PP resin, and the mass ratio of the superfine silicon dioxide to the superfine graphite is 3:1.8 to 2.5;

alternatively, the extinction modifier is a composite of light calcium carbonate and superfine silica.

2. The matting antistatic material for CPP casting films according to claim 1, wherein when the matting modifier is ultrafine silica, the mass ratio of the ultrafine silica to ultrafine graphite is 3:2.

3. the extinction antistatic material for CPP casting films according to claim 2, which is characterized by comprising the following raw materials in parts by weight:

49 parts of PP resin

Superfine silica 15 parts

10 parts of superfine graphite

Antioxidant 0.5 part

2 parts of coupling agent

0.5 part of dispersing lubricant.

4. A process for producing a matt antistatic material for CPP cast film as claimed in any one of claims 1 to 3, characterized by comprising the following steps:

5. The method for preparing a extinction antistatic material for a CPP casting film according to claim 4, wherein the stirring rate of preparing the first mixed material in the step S1 and the stirring rate of preparing the second mixed material in the step S2 are 320-380 rpm, and the stirring time is 3-8 minutes;

6. The method for preparing a matt antistatic material for CPP cast film according to claim 4, wherein in step S4, the extrusion granulation process conditions are as follows:

the temperature of each zone of the extruder is as follows: the temperature of the first region is 145-155 ℃, the temperature of the second region is 175-185 ℃, the temperature of the third region to the seventh region is 185-195 ℃, the temperature of the eighth region to the tenth region is 195-205 ℃, and the temperature of the machine head is 205-215 ℃;