CN114181455A - Extinction antistatic material for CPP cast film and preparation method thereof - Google Patents
Extinction antistatic material for CPP cast film and preparation method thereof Download PDFInfo
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- CN114181455A CN114181455A CN202111449440.1A CN202111449440A CN114181455A CN 114181455 A CN114181455 A CN 114181455A CN 202111449440 A CN202111449440 A CN 202111449440A CN 114181455 A CN114181455 A CN 114181455A
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/34—Silicon-containing compounds
- C08K3/36—Silica
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/02—Elements
- C08K3/04—Carbon
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/24—Acids; Salts thereof
- C08K3/26—Carbonates; Bicarbonates
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/24—Acids; Salts thereof
- C08K3/26—Carbonates; Bicarbonates
- C08K2003/265—Calcium, strontium or barium carbonate
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/017—Additives being an antistatic agent
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- Extrusion Moulding Of Plastics Or The Like (AREA)
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Abstract
The invention belongs to the technical field of extinction antistatic materials, and provides an extinction antistatic material for a CPP cast film and a preparation method thereof, wherein the extinction antistatic material for the CPP cast 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 dispersing lubricant; wherein the extinction modifier is at least one of light calcium carbonate and superfine silicon dioxide. The extinction antistatic material for the CPP cast film is prepared by adding the extinction modifier and the ultrafine graphite into PP resin and then matching with other auxiliaries, so that the extinction performance and the antistatic performance of the material are effectively improved.
Description
Technical Field
The invention relates to the technical field of extinction antistatic materials, in particular to an extinction antistatic material for a CPP cast film and a preparation method thereof.
Background
The polypropylene film, referred to as PP film for short, has the characteristics of light weight, moisture resistance, high mechanical strength, good dimensional stability, no toxicity, no odor and the like, and is widely applied to packaging materials of cigarettes, foods and agricultural and sideline products. The PP film is mainly classified into a CPP cast film, a BOPP film, and an IPP film. Wherein the CPP cast film is a non-stretching and non-oriented flat extrusion 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 that the CPP cast film is most widely applied.
At present, in order to meet the market demand for low-gloss PP films, researchers developed matting materials for PP films, such as one provided in publication No. CN 111909435A. However, the antistatic performance of the existing delustering PP film is poor. Therefore, it is needed to develop a delustering antistatic material for a CPP cast film with both excellent delustering performance and antistatic performance to further expand the application range of PP films, especially CPP cast films.
Disclosure of Invention
The invention aims to provide a delustering antistatic material for a CPP cast film, which has excellent delustering performance and antistatic performance aiming at the defects of the prior art.
The invention also aims to overcome the defects of the prior art and provide the preparation method of the extinction antistatic material for the CPP cast film, which has the advantages of stable preparation process and low production cost and is suitable for large-scale production.
Based on the above, the invention discloses a delustering antistatic material for a CPP cast 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. Wherein, the particle size of the superfine silicon dioxide is preferably 1um, and the particle size of the superfine graphite is preferably 1 um.
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 ultrafine 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 ultrafine silicon dioxide, the addition amount of the ultrafine silicon dioxide is 26-35% of the mass of the PP resin, and the mass ratio of the ultrafine silicon dioxide to the ultrafine graphite is 3: 1.8 to 2.5.
Further preferably, the mass ratio of the ultrafine silica to the ultrafine graphite is 3: 2.
still preferably, the extinction antistatic material for the CPP cast film comprises the following raw materials in parts by weight:
preferably, the extinction modifier is a compound of light calcium carbonate and ultrafine 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 cast film, the extinction modifier (namely light calcium carbonate and/or ultrafine silica) and the ultrafine graphite and other auxiliaries are added into the PP resin, the mass ratio of the ultrafine silica or the ultrafine silica in the PP resin is controlled, and the mass ratio of different extinction modifiers to the ultrafine graphite is well controlled, so that the extinction degree and the surface resistance of the extinction antistatic material for the CPP cast film can be greatly reduced while the input amount and the cost of the extinction modifier and the ultrafine graphite are properly controlled, 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 cast film, which comprises the following preparation steps:
step S1, mixing the extinction modifier, the ultrafine graphite and the coupling agent, and uniformly stirring to obtain a first mixed material;
step 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 step S4, putting the third mixed material into an extruder for extrusion granulation to obtain the extinction antistatic material for the CPP cast film.
Preferably, the stirring speed and the stirring time of the first mixed material prepared in the step S1 and the second mixed material prepared in the step S2 are both 320-380 r/min and 3-8 min respectively;
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 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 zone is 145-155 ℃, the temperature of the second zone is 175-185 ℃, the temperature of the third zone to the seventh zone is 185-195 ℃, the temperature of the eighth zone to the tenth zone is 195-205 ℃, and the temperature of the machine head is 205-215 ℃;
in the extrusion granulation process, the rotating speed of a screw is 285-315 revolutions per minute, the rotating speed of feeding is 30-50 revolutions per minute, the rotating speed of a granulator is 25-40 revolutions per minute, the vacuum degree is less than or equal to 0.1Mpa, and the temperature of a water tank is 30-50 ℃.
Compared with the prior art, the invention at least comprises the following beneficial effects:
according to the extinction antistatic material for the CPP cast film, the PP resin is used as a main body resin, the coupling agent, the antioxidant and the dispersing wetting agent are used as auxiliary agents, the light calcium carbonate and/or the ultrafine silica are used as extinction modifiers, the ultrafine graphite is used as an antistatic modifier and an auxiliary extinction modifier, and the light calcium carbonate and/or the ultrafine silica and the ultrafine graphite play a synergistic effect under the cooperation of the main body resin and the auxiliary agents, so that the glossiness and the surface resistance of the extinction antistatic material for the CPP cast film are greatly reduced, and the extinction performance and the antistatic performance of the extinction antistatic material for the CPP cast film are effectively improved. The extinction degree of the extinction antistatic material for the CPP cast film can be reduced to be less than 10, and the surface resistance of the extinction antistatic material can reach 1 multiplied by 107Ω。
Detailed Description
The present invention will be described in further detail with reference to specific embodiments in order to make the above objects, features and advantages more apparent and understandable.
In the following examples, unless otherwise specified, PP F800E, available from china Shanghai petrochemical company, Inc., was used as the PP resin.
Example 1
The extinction antistatic material for the CPP cast film comprises the following raw materials in parts by weight:
the preparation method of the extinction antistatic material for the CPP cast film comprises the following preparation steps:
and step S1, mixing the extinction modifier, the ultrafine graphite and the coupling agent, and stirring for 5 minutes at 350 revolutions per minute to obtain a first mixed material.
And step S2, adding an antioxidant and a dispersing lubricant into the first mixed material, and stirring for 5 minutes at 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.
And step S4, putting the third mixed material into an extruder for extrusion granulation to prepare the extinction antistatic material for the CPP cast film.
Wherein, the extrusion granulation process conditions in step S4 are as follows:
the temperature of each zone of the extruder is as follows: the temperature of the first zone is 150 ℃, the temperature of the second zone is 180 ℃, the temperature of the third zone to the seventh zone is 190 ℃, the temperature of the eighth zone to the tenth zone is 200 ℃, and the temperature of the machine head is 210 ℃;
in the extrusion granulation process, the rotating speed of the screw is 300 revolutions per minute, the rotating speed of the feeding is 40 revolutions per minute, the rotating speed of the granulator is 35 revolutions per minute, the vacuum degree is less than or equal to 0.1Mpa, and the temperature of the water tank is 40 ℃.
Example 2
The extinction antistatic material for the CPP cast film comprises the following raw materials in parts by weight:
a method for preparing a matte antistatic material for a CPP cast film of the present example refers to example 1.
Example 3
The extinction antistatic material for the CPP cast film comprises the following raw materials in parts by weight:
a method for preparing a matte antistatic material for a CPP cast film of the present example refers to example 1.
Example 4
The extinction antistatic material for the CPP cast film comprises the following raw materials in parts by weight:
the preparation method of the extinction antistatic material for the CPP cast film comprises the following preparation steps:
and step S1, mixing the extinction modifier, the ultrafine graphite and the coupling agent, and stirring for 8 minutes at 380 r/min to obtain a first mixed material.
And step 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.
And step S4, putting the third mixed material into an extruder for extrusion granulation to prepare the extinction antistatic material for the CPP cast film.
Wherein, the extrusion granulation process conditions in step S4 are as follows:
the temperature of each zone of the extruder is as follows: the temperature of the first zone is 155 ℃, the temperature of the second zone is 185 ℃, the temperatures of the third zone to the seventh zone are 195 ℃, the temperatures of the eighth zone to the tenth zone are 205 ℃, and the temperature of a machine head is 215 ℃;
in the extrusion granulation process, the rotating speed of a screw is 315 revolutions per minute, the rotating speed of feeding is 50 revolutions per minute, the rotating speed of a granulator is 40 revolutions per minute, the vacuum degree is less than or equal to 0.1Mpa, and the temperature of a water tank is 50 ℃.
Example 5
The extinction antistatic material for the CPP cast film comprises the following raw materials in parts by weight:
a method for preparing a matte antistatic material for a CPP cast film of the present example refers to example 4.
Example 6
The extinction antistatic material for the CPP cast film and the preparation method thereof refer to the embodiment 1, and the difference from the embodiment 1 is that:
15 parts of ultrafine silica in the matting antistatic material for a CPP cast film of this example was changed to 15 parts of precipitated calcium carbonate, and the amount of ultrafine graphite added was changed to 5 parts.
Example 7
The extinction antistatic material for the CPP cast film comprises the following raw materials in parts by weight:
a method for preparing a matte antistatic material for a CPP cast film of the present example refers to example 1.
Example 8
The extinction antistatic material for the CPP cast film comprises the following raw materials in parts by weight:
a method for preparing a matte antistatic material for a CPP cast film of the present example refers to example 1.
Example 9
The extinction antistatic material for the CPP cast film comprises the following raw materials in parts by weight:
a method for preparing a matte antistatic material for a CPP cast film of the present example refers to example 4.
Example 10
The extinction antistatic material for the CPP cast film comprises the following raw materials in parts by weight:
a method for preparing a matte antistatic material for a CPP cast film of the present example refers to example 1.
Example 11
The extinction antistatic material for the CPP cast film comprises the following raw materials in parts by weight:
the preparation method of the extinction antistatic material for the CPP cast film comprises the following preparation steps:
and step 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 step 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.
And step S4, putting the third mixed material into an extruder for extrusion granulation to prepare the extinction antistatic material for the CPP cast film.
Wherein, the extrusion granulation process conditions in step S4 are as follows:
the temperature of each zone of the extruder is as follows: the temperature of the first zone is 145 ℃, the temperature of the second zone is 175 ℃, the temperature of the third zone to the seventh zone is 185 ℃, the temperature of the eighth zone to the tenth zone is 195 ℃, and the temperature of the machine head is 205 ℃;
in the extrusion granulation process, the rotating speed of the screw is 285 rpm, the rotating speed of the feeding 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 temperature of the water tank is 30 ℃.
Comparative example 1
A extinction antistatic material for a CPP cast film and a preparation method thereof of the comparative example refer to example 1, and are different from example 1 in that: the extinction antistatic material for the CPP cast film of the comparative example is not added with an extinction modifier and ultrafine graphite.
Comparative example 2
A extinction antistatic material for a CPP cast film and a preparation method thereof of the comparative example refer to example 1, and are different from example 1 in that: the extinction antistatic material for the CPP cast film of the comparative example is not added with ultrafine graphite.
Comparative example 3
A extinction antistatic material for a CPP cast film and a preparation method thereof of the comparative example refer to example 6, and are different from example 6 in that: the extinction antistatic material for the CPP cast film of the comparative example is not added with ultrafine graphite.
Performance testing
The CPP cast films with the thickness of 40um, which are respectively prepared by adopting the extinction antistatic materials for the CPP cast films of the embodiments 1-11 and the comparative examples 1-3, are respectively subjected to performance tests, wherein the reference standard of each performance test is as follows: gloss: GB/T8807-1988; surface resistance: GB/T10064-2006, the test results are shown in the following tables 1-2:
TABLE 1
| Sample (I) | Degree of gloss | Surface resistance (omega) |
| Comparative example 1 | 65 | 1×1014 |
| Example 1 | 8 | 1×107 |
| Example 2 | 9.5 | 0.7×107 |
| Example 3 | 7.6 | 0.83×107 |
| Example 4 | 7.8 | 2.1×107 |
| Example 5 | 8.1 | 0.9×107 |
| Example 6 | 9 | 1×108 |
| Example 7 | 9.8 | 0.86×108 |
| Example 8 | 8.3 | 1.1×108 |
| Example 9 | 7.5 | 1.3×109 |
| Example 10 | 7.2 | 6.3×107 |
| Example 11 | 6.5 | 3.8×107 |
As can be seen from Table 1, compared with the extinction antistatic material for the CPP cast film without adding the extinction modifier and the ultrafine graphite in the comparative example 1, the extinction antistatic materials for the CPP cast films in the examples 1 to 11 have obviously reduced extinction degree and surface resistance, and have better extinction performance and antistatic performance.
TABLE 2
As can be seen from table 2, compared with comparative example 2 (in which no ultrafine graphite is added), the surface resistance of the antistatic material for CPP cast film of example 1 (in which 10 parts of ultrafine graphite is added) is greatly reduced, the antistatic performance thereof is significantly improved, and the glossiness of the antistatic material for CPP cast film of example 1 is also significantly reduced, which shows that the ultrafine silica and the ultrafine graphite in the antistatic material for CPP cast film of example 1 can be synergistically enhanced to achieve the effect of further improving the matting performance thereof.
Similarly, compared with the comparative example 3 (in which no ultrafine graphite is added), the surface resistance of the extinction antistatic material for the CPP cast film of the example 6 (in which 5 parts of ultrafine graphite is added) is greatly reduced, the antistatic performance is obviously improved, and the glossiness of the extinction antistatic material for the CPP cast film of the example 6 is obviously reduced, which shows that the light calcium carbonate and the ultrafine graphite in the extinction antistatic material for the CPP cast film of the example 6 can be synergized to achieve the effect of further improving the extinction performance.
In summary, the extinction antistatic material for the CPP cast film can greatly improve the extinction performance and the antistatic performance of the extinction antistatic material for the CPP cast film by adding the extinction modifier (namely light calcium carbonate and/or ultrafine silicon dioxide) and ultrafine graphite into PP resin and then matching with other auxiliaries.
While preferred embodiments of the present invention have been described, additional variations and modifications of these embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the embodiments of the invention.
The technical solutions provided by the present invention are described in detail above, and the principle and the implementation of the present invention are explained in this document by applying specific examples, and the descriptions of the above examples are only used to help understanding the method and the core idea of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (10)
1. The extinction antistatic material for the CPP cast film is characterized by comprising the following raw materials in parts by weight:
wherein the extinction modifier is at least one of light calcium carbonate and superfine silicon dioxide.
2. The extinction antistatic material for the CPP cast film according to claim 1, wherein the extinction modifier is light calcium carbonate, the addition amount of the light calcium carbonate is 26-35% of the PP resin, and the mass ratio of the light calcium carbonate to the ultrafine graphite is 3: 0.9 to 1.2.
3. The extinction antistatic material for the CPP cast film as claimed in claim 2, wherein the mass ratio of the light calcium carbonate to the ultrafine graphite is 3: 1.
4. the extinction antistatic material for the CPP cast film according to claim 1, wherein the extinction modifier is ultrafine silica, the addition amount of the ultrafine silica is 26-35% of the PP resin by mass, and the mass ratio of the ultrafine silica to the ultrafine graphite is 3: 1.8 to 2.5.
5. The extinction antistatic material for the CPP cast film as claimed in claim 4, wherein the mass ratio of the ultrafine silica to the ultrafine graphite is 3: 2.
6. the extinction antistatic material for the CPP cast film is characterized by comprising the following raw materials in parts by weight:
7. the extinction antistatic material for the CPP cast film according to the claim 1, characterized in that the extinction modifier is a compound of light calcium carbonate and ultrafine silica.
8. A method for preparing a matting antistatic material for a CPP cast film according to any one of claims 1 to 7, characterized by comprising the following preparation steps:
step S1, mixing the extinction modifier, the ultrafine graphite and the coupling agent, and uniformly stirring to obtain a first mixed material;
step 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 step S4, putting the third mixed material into an extruder for extrusion granulation to obtain the extinction antistatic material for the CPP cast film.
9. The method for preparing an extinction antistatic material for a CPP cast film according to claim 8, wherein the stirring speed and the stirring time of the first mixed material prepared in the step S1 and the second mixed material prepared in the step S2 are both 320-380 r/min and 3-8 min respectively;
in the step S3, the stirring speed of the third mixed material is 450-500 rpm, and the stirring time is 3-8 minutes.
10. The method for preparing a extinction antistatic material for a CPP cast film according to the claim 8, characterized in that 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 zone is 145-155 ℃, the temperature of the second zone is 175-185 ℃, the temperature of the third zone to the seventh zone is 185-195 ℃, the temperature of the eighth zone to the tenth zone is 195-205 ℃, and the temperature of the machine head is 205-215 ℃;
in the extrusion granulation process, the rotating speed of a screw is 285-315 revolutions per minute, the rotating speed of feeding is 30-50 revolutions per minute, the rotating speed of a granulator is 25-40 revolutions per minute, the vacuum degree is less than or equal to 0.1Mpa, and the temperature of a water tank is 30-50 ℃.
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| CN101302299A (en) * | 2008-01-04 | 2008-11-12 | 上海金浦塑料包装材料有限公司 | Low-light matt film and preparation thereof |
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| CN110183768A (en) * | 2019-05-15 | 2019-08-30 | 中国石化扬子石油化工有限公司 | Smooth master batch of a kind of casting films height and preparation method thereof and invigorating sliding casting films |
| CN113088000A (en) * | 2019-12-23 | 2021-07-09 | 武汉市江汇塑业有限公司 | CPP puncture-resistant cooking bag |
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2021
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| CN101302299A (en) * | 2008-01-04 | 2008-11-12 | 上海金浦塑料包装材料有限公司 | Low-light matt film and preparation thereof |
| CN103360678A (en) * | 2012-03-30 | 2013-10-23 | 上海杰事杰新材料(集团)股份有限公司 | Polypropylene/montmorillonite/graphite nanocomposite material and preparation method for same |
| CN110183768A (en) * | 2019-05-15 | 2019-08-30 | 中国石化扬子石油化工有限公司 | Smooth master batch of a kind of casting films height and preparation method thereof and invigorating sliding casting films |
| CN113088000A (en) * | 2019-12-23 | 2021-07-09 | 武汉市江汇塑业有限公司 | CPP puncture-resistant cooking bag |
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