CN105199180B - Composition for forming weakly alkaline polyolefin breathable film and preparation method thereof - Google Patents
Composition for forming weakly alkaline polyolefin breathable film and preparation method thereof Download PDFInfo
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- CN105199180B CN105199180B CN201510597793.4A CN201510597793A CN105199180B CN 105199180 B CN105199180 B CN 105199180B CN 201510597793 A CN201510597793 A CN 201510597793A CN 105199180 B CN105199180 B CN 105199180B
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- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
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Abstract
The invention relates to a composition for forming a weakly basic polyolefin breathable film and a preparation method thereof. The composition comprises 35-60 parts of calcium carbonate, 30-50 parts of polyolefin resin, 0.1-0.5 part of antioxidant, 0.1-0.5 part of polyethylene glycol and 0.1-0.3 part of polyethylene glycol type nonionic surfactant. The composition achieves the objective of lowering the pH of the resulting breathable polyolefin film as compared to the prior art.
Description
Technical Field
The present invention relates to a composition for forming a polyolefin breathable film, and more particularly to a method for preparing a composition for forming a weakly basic polyolefin breathable film.
Background
The breathable film is also called as a waterproof breathable microporous film, is characterized by being breathable and waterproof, and is widely applied to a plurality of fields of medical treatment, textile, building, agriculture and the like. The existing manufacturing technology of the breathable film is mainly manufactured by adopting a stretching filled polymer technology. The technique requires surface modification of the inorganic filler to prevent filler agglomeration. Traditional surface modifiers comprise stearic acid (salt), titanate coupling agent, aluminate coupling agent and the like, are not firmly combined with the surface of filler particles, and are easy to desorb through double-screw shearing to cause the inorganic filler to re-agglomerate, influence the dispersion of the filler and cause the pH value of the breathable film to be higher (usually 9-11).
The breathable film is applied to disposable absorbent products such as paper diapers, sanitary towels, protection pads and the like as a liquid isolating bottom layer, and the functions of breathability and watertightness are realized, but the pH value of the product is higher. The skin of human body is in weak acidity, which is beneficial to preventing the invasion and reproduction of pathogenic bacteria. If the skin contacts a product with higher alkalinity, the natural barrier on the surface layer of the skin is easy to be damaged, and certain germs easily grow and reproduce under the alkaline condition to stimulate the skin, so that discomfort and even diseases are caused to the human body.
Disclosure of Invention
The present invention aims to overcome the above-mentioned drawbacks of breathable films and to provide a novel composition for forming weakly basic breathable films which achieves the objective of reducing the pH of the formed weakly basic polyolefin breathable films.
The composition for forming the weakly basic polyolefin breathable film comprises 35-60 parts of calcium carbonate, 30-50 parts of polyolefin resin, 0.1-0.5 part of antioxidant and 0.1-0.5 part of polyethylene glycol, and is characterized by further comprising 0.1-0.3 part of nonionic surfactant.
The calcium carbonate has the advantages of easily available raw materials, low price, good stability, no toxicity and the like, so that the calcium carbonate is widely used in the fields of plastics, rubber, papermaking and the like, and is the most ideal filling material for the breathable film. Calcium carbonate belongs to inorganic powder, the surface of the calcium carbonate is hydrophilic and oleophobic, the dispersibility in a polymer and the bonding force with the polymer body are poor, and a surface modifier is required to be adopted to carry out surface modification on the calcium carbonate. The traditional method is to treat the surface of the filler with low molecular dispersing agent (such as stearic acid, stearate, silane, titanate, etc.).
The molecular structure of the traditional surface modifier has certain limitations: the hydrophilic chain segment is short, the bonding on the surface of particles with low polarity or non-polarity is not firm, and the calcium carbonate is easy to desorb to cause re-agglomeration, so that the dispersibility of the calcium carbonate is influenced; the lipophilic group does not have enough carbon chain length and cannot generate enough steric hindrance effect in a dispersion system to play a stabilizing role. In order to overcome the problem, the traditional method is to increase the additive amount of the surface modifier, but because the molecular weight of the traditional surface modifier is lower and the boiling point of the traditional surface modifier is lower than the processing temperature of the breathable film, the film is easy to generate die coke accumulation in the processing process, and the production is seriously influenced. And the traditional modifier is not firmly combined with the surface of calcium carbonate, and is easy to desorb by double-screw shearing in the processing process of the breathable film composition, so that the dispersibility of the calcium carbonate is influenced, and the performance of the breathable film is reduced and the pH value is higher.
The invention provides a preparation method of activated calcium carbonate, which comprises the following steps:
step 1, preparation of polyolefin resin powder: mixing polyolefin resin, and grinding the mixture by a grinding machine, wherein the grain diameter of the ground polyolefin resin powder is 10-30 mu m;
step 2, performing surface modification on calcium carbonate by adopting a dry process: putting 35-60 parts of calcium carbonate into a high-speed mixer at 110 ℃ for dehydration, adding 0.1-0.5 part of polyethylene glycol after 15 minutes, and stirring for 3 minutes; then adding 0.1-0.3 part of nonionic surfactant, and stirring for 3 minutes; then adding 10-20 parts of the polyolefin resin powder prepared in the step 1, stirring for 3 minutes, cooling to prepare active calcium carbonate, and adding the substances according to a certain proportion;
the molecular formula of the polyethylene glycol selected by the invention is H- (O-CH)2-CH2-)nOH contains two hydrophilic groups of hydroxyl and ether bond without hydrophobic group, so that strong hydrogen bond is easily formed on the surface of calcium carbonate particles, and the ether bond of the OH also easily generates affinity action with the surface of the particles, so that PEG is easily adsorbed on the surface of calcium carbonate, thereby forming a layer of polymer film to wrap the calcium carbonate. The protective film has a certain thickness and presents a steric hindrance effect, so that the attraction among calcium carbonate particles is greatly weakened, and the agglomeration of the particles is effectively inhibited. If the molecular weight of the polyethylene glycol is too small, the steric hindrance effect which the macromolecule should have cannot be fully played, and the dispersing effect is common; when the molecular weight is larger, PEG molecular chains are saturated and adsorbed on the surfaces of powder particles, and the formed organic hydrophilic protective film can really play a role in space stabilization, so that calcium carbonate is finally stably dispersed, and agglomeration among the particles is effectively prevented. Too high molecular weight can cause the viscosity of PEG to rise, influence the infiltration of the PEG to calcium carbonate, even influence the rheological property of the calcium carbonate, and cause the processing property to be poor. According to test, the preferable polyethylene glycol of the invention is PEG6000 and PEG8000, the molecular weight is 5500-And (3) charring.
The nonionic surfactant selected by the invention is polyethylene glycol type nonionic surfactant which is fatty alcohol polyoxyethylene ether (R-O- (CH)2CH2O)n-H), alkylphenol ethoxylates (R-C6H4(OC2H4)nOH) polyethylene glycol type nonionic surfactant consists of hydrophobic carbon chain and hydrophilic EO chain, only if the hydrophilic ethylene oxide EO chain has enough length, a protective layer with enough thickness can be formed on the surface of solid particles, and agglomeration among particles is avoided, R is saturated or unsaturated alkyl, n is addition number of ethylene oxide, the higher the hydrophilicity is, the better the hydrophilicity is, because the hydrophilic group is composed of hydroxyl and ether bond, and only one hydroxyl exists at the end group of the molecule, the hydrophilicity is small, the number of ethylene oxide molecules must be increased to adjust the hydrophilicity, the EO chain growth of polyoxyethylene ether is increased, the H L B value is increased, H L B is hydrophile-lipophile balance value of the surfactant, the preferred fatty alcohol polyoxyethylene ether of the invention, the carbon number of the alkyl carbon chain is 18-24, the ethylene oxide addition number is more than 15, the H L B value is 13.0-18.0, the preferred alkyl phenol polyoxyethylene ether is 12-18, the EO addition number of EO chain is more than 15, and the H L B value is more than 15.0-18.0.15.
The polyethylene glycol type nonionic surfactant selected by the invention has good compatibility with polyethylene glycol and can play an effective synergistic effect. The polyethylene glycol type nonionic surfactant is adopted to carry out secondary coating on the calcium carbonate modified by polyethylene glycol, so that the risk of surface exposure of the calcium carbonate can be effectively reduced. After the calcium carbonate is coated and modified by polyethylene glycol and polyethylene glycol type nonionic surfactant, the lipophilic group of the polyethylene glycol type nonionic surfactant faces outwards and can be entangled with polyolefin molecules, so that the interface binding force is improved.
The present invention pulverizes a polyolefin resin. The particle size of the polyolefin resin powder is controlled to be 10-30 mu m, the specific surface area of the polyolefin resin powder is increased, the polyolefin resin powder is in full contact with calcium carbonate, and the calcium carbonate coating effect is improved. If the particle size of the polyolefin powder is too small, the active calcium carbonate is easy to agglomerate in the preparation process, and the processing is influenced; if the particle size is too large, the specific surface area of the polyolefin powder is small, and the calcium carbonate activation coating effect is poor. Mixing polyolefin resin powder with calcium carbonate treated by polyethylene glycol and polyethylene glycol type nonionic surfactant, and performing third surface coating modification by dry process. The polyethylene glycol, the polyethylene glycol type nonionic surfactant and the polyolefin powder adopted by the invention have good synergistic effect in the surface modification process of calcium carbonate, and the implementation of the invention can effectively realize the purposes of improving the dispersibility of the calcium carbonate and reducing the pH value.
It is another object of the present invention to provide a method for preparing a composition constituting the above weakly basic polyolefin breathable film, comprising the steps of:
step 1, preparation of polyolefin resin powder: mixing polyolefin resin, and grinding the mixture by a grinding machine, wherein the grain diameter of the ground polyolefin resin powder is 10-30 mu m;
step 2, performing surface modification on calcium carbonate by adopting a dry process: putting 35-60 parts of calcium carbonate into a high-speed mixer at 110 ℃ for dehydration, adding 0.1-0.5 part of polyethylene glycol after 15 minutes, and stirring for 3 minutes; then adding 0.1-0.3 part of nonionic surfactant, and stirring for 3 minutes; then adding 10-20 parts of the polyolefin resin powder prepared in the step 1, stirring for 3 minutes, cooling to prepare active calcium carbonate, and adding the substances according to a certain proportion;
step 3, preparation of the composition: feeding 60-80 parts of active calcium carbonate, 0.1-0.5 part of antioxidant and 20-40 parts of polyolefin resin into a double-screw extruder in proportion for mixing and granulation.
The preparation method has the advantages that the preparation of the polyolefin resin powder is realized, the particle size of the polyolefin resin powder is controlled to be 10-30 mu m, the specific surface area of the polyolefin resin is improved, and the calcium carbonate coating effect is improved.
The synergistic effect of the polyethylene glycol, the polyethylene glycol type nonionic surfactant and the polyolefin resin powder in the composition improves the dispersion level of the composition, and the purpose of reducing the pH value of the polyolefin breathable film can be easily realized by adjusting the type and the dosage of the surfactant.
The invention also provides a method for testing the activation degree of calcium carbonate, which comprises the following steps:
the degree of activation reflects the degree of surface modification of the calcium carbonate. Calcium carbonate has a strongly polar surface, showing good hydrophilic properties, and when it is placed in water, it will automatically settle. After the surface of the calcium carbonate is modified by the modifier, the modifier groups are combined with the surface of the calcium carbonate, and the hydrophobic groups tend to be arranged and uniformly exposed, so that the surface of the calcium carbonate presents good hydrophobicity and can stably float on the water surface.
Weighing about 5g of sample, accurately measuring two points after decimal point, putting the weighed calcium carbonate into a separating funnel with the thickness of 250m L, adding 200m L deionized water, oscillating for 1min, placing the separating funnel on a funnel frame after oscillation, standing for 20-30min, separating out precipitated calcium carbonate once after obvious layering appears in the funnel, placing the precipitate into a crucible with constant weight at the temperature of 105 +/-5 ℃, and placing the crucible into an oven with the temperature of 105 +/-5 ℃ for constant weight.
The activation degree is expressed in mass fraction ω, and the value is expressed in% and calculated by the following formula:
in the formula:
-the sum of the weight of the non-activated calcium carbonate and the crucible in g;
The specific technical scheme of the invention is as follows:
1. a composition for forming a weakly basic polyolefin breathable film, the composition comprising 35-60 parts of calcium carbonate, 30-50 parts of polyolefin resin, 0.1-0.5 part of antioxidant, 0.1-0.5 part of polyethylene glycol, characterized in that the composition further comprises 0.1-0.3 part of nonionic surfactant.
2. The composition according to claim 1, wherein the polyolefin resin is one or a mixture of polyethylene resin (PE), polypropylene resin (PP), ethylene-propylene copolymer, ethylene-butylene copolymer.
3. The composition according to claim 1, wherein the antioxidant is one of a phenolic antioxidant and a phosphite antioxidant, or a mixture thereof.
4. The composition according to claim 1, wherein the polyethylene glycol is one of PEG6000 and PEG8000 or their mixture.
5. The composition according to claim 1, wherein the nonionic surfactant is a polyethylene glycol type nonionic surfactant.
6. The composition according to claim 5, wherein the polyethylene glycol type nonionic surfactant is one or a mixture of fatty alcohol-polyoxyethylene ether and alkylphenol ethoxylate.
7. The composition according to claim 6, wherein the carbon number of the alkyl carbon chain of the fatty alcohol-polyoxyethylene ether is 18-24, and the EO addition number is greater than 15.
8. The composition according to claim 6, wherein the alkylphenol ethoxylate has an alkyl carbon chain connected to a benzene ring with a carbon number of more than 12 and an EO addition number of more than 15.
9. A method of preparing a composition according to any preceding claim, comprising the steps of:
step 1, preparation of polyolefin resin powder: mixing polyolefin resin, and grinding the mixture by a grinding machine, wherein the grain diameter of the ground polyolefin resin powder is 10-30 mu m;
step 2, performing surface modification on calcium carbonate by adopting a dry process: putting 35-60 parts of calcium carbonate into a high-speed mixer at 110 ℃ for dehydration, adding 0.1-0.5 part of polyethylene glycol after 15 minutes, and stirring for 3 minutes; then adding 0.1-0.3 part of nonionic surfactant, and stirring for 3 minutes; then adding 10-20 parts of the polyolefin resin powder prepared in the step 1, stirring for 3 minutes, cooling to prepare active calcium carbonate, and adding the substances according to a certain proportion;
step 3, preparation of the composition: feeding 60-80 parts of active calcium carbonate, 0.1-0.5 part of antioxidant and 20-40 parts of polyolefin resin into a double-screw extruder in proportion for mixing and granulation.
10. A method of preparing the calcium carbonate according to any one of the claims into activated calcium carbonate, the method comprising:
step 1, preparation of polyolefin resin powder: mixing polyolefin resin, and grinding the mixture by a grinding machine, wherein the grain diameter of the ground polyolefin resin powder is 10-30 mu m;
step 2, performing surface modification on calcium carbonate by adopting a dry process: putting 35-60 parts of calcium carbonate into a high-speed mixer at 110 ℃ for dehydration, adding 0.1-0.5 part of polyethylene glycol after 15 minutes, and stirring for 3 minutes; then adding 0.1-0.3 part of nonionic surfactant, and stirring for 3 minutes; then adding 10-20 parts of the polyolefin resin powder prepared in the step 1, stirring for 3 minutes, cooling to prepare active calcium carbonate, and adding the above substances according to a certain proportion.
Detailed Description
The invention provides a composition for forming a weakly alkaline polyolefin breathable film, which comprises calcium carbonate, polyolefin resin, polyethylene glycol, an antioxidant and a surfactant, wherein the surfactant is a polyethylene glycol type surfactant, and the polyethylene glycol type surfactant is a long-chain fatty alcohol-polyoxyethylene ether or alkylphenol polyoxyethylene ether nonionic surfactant.
The invention will be further illustrated with reference to the following specific examples. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Further, it should be understood that various changes or modifications of the present invention may be made by those skilled in the art after reading the teaching of the present invention, and such equivalents may fall within the scope of the present invention as defined in the appended claims.
The polymer is filled, mixed and granulated by adopting a homodromous twin-screw granulator group, so that the composition forming the alkalescent polyolefin breathable film can be guaranteed to be highly sheared and uniformly dispersed in the screw.
Example 1
55kg of calcium carbonate (D50 is 2 μm, D98 is not more than 10 μm) is dehydrated in a high-speed mixer at 110 ℃, stirred at high speed for 15 minutes, added with 0.15kg of PEG6000 and stirred for 3 minutes. 0.15kg of alkylphenol polyoxyethylene is added and stirred for 3 minutes, 10kg of polyethylene powder is added and stirred for 3 minutes, and the active calcium carbonate is prepared.
65kg of active calcium carbonate, 0.15kg of antioxidant 1010 and 35kg of polyolefin resin are fed into a double-screw extruder in proportion for mixing and granulation.
Example 2
55kg of calcium carbonate (D50 is 2 μm, D98 is not more than 10 μm) was dehydrated in a high-speed mixer at 110 ℃ and stirred at high speed for 15 minutes, then 0.15kg of PEG6000 was added and stirred for 3 minutes. Adding 0.15kg of fatty alcohol-polyoxyethylene ether, stirring for 3 minutes, adding 10kg of polyethylene powder, and stirring for 3 minutes to prepare the activated calcium carbonate.
65kg of active calcium carbonate, 0.15kg of antioxidant 1010 and 35kg of polyolefin resin are fed into a double-screw extruder in proportion for mixing and granulation.
Example 3
55kg of calcium carbonate (D50 is 2 μm, D98 is not more than 10 μm) is dehydrated in a high-speed mixer at 110 ℃, stirred at high speed for 15 minutes, added with 0.15kg of PEG8000 and stirred for 3 minutes. 0.15kg of alkylphenol polyoxyethylene is added and stirred for 3 minutes, 10kg of polyethylene powder is added and stirred for 3 minutes, and the active calcium carbonate is prepared.
65kg of active calcium carbonate, 0.15kg of antioxidant 1010 and 35kg of polyolefin resin are fed into a double-screw extruder in proportion for mixing and granulation.
Example 4
55kg of calcium carbonate (D50 is 2 μm, D98 is not more than 10 μm) is dehydrated in a high-speed mixer at 110 ℃, stirred at high speed for 15 minutes, added with 0.15kg of PEG8000 and stirred for 3 minutes. Adding 0.15kg of fatty alcohol-polyoxyethylene ether, stirring for 3 minutes, adding 10kg of polyethylene powder, and stirring for 3 minutes to prepare the activated calcium carbonate.
65kg of active calcium carbonate, 0.15kg of antioxidant 1010 and 35kg of polyolefin resin are fed into a double-screw extruder in proportion for mixing and granulation.
Comparative example 1
55kg of calcium carbonate (D50 is 2 μm, D98 is not more than 10 μm) is put in a high-speed mixer at 110 ℃ for dehydration, 0.3kg of stearic acid is added after high-speed stirring for 15 minutes, and the active calcium carbonate is prepared after high-speed stirring for 3 minutes.
65kg of the activated calcium carbonate, 0.15kg of the antioxidant 1010 and 45kg of the polyolefin resin are fed into a double-screw extruder for mixing and granulation.
Comparative example 2
Placing 55kg of calcium carbonate (D50 is 2 μm, D98 is not more than 10 μm) in a high-speed mixer at 110 ℃ for dehydration, adding 0.3kg of titanate after stirring at high speed for 15 minutes, and stirring at high speed for 3 minutes to prepare the activated calcium carbonate.
65kg of the activated calcium carbonate, 0.15kg of the antioxidant 1010 and 45kg of the polyolefin resin are fed into a double-screw extruder for mixing and granulation.
Comparative example 3
55kg of calcium carbonate (D50 is 2 μm, D98 is not more than 10 μm) is put in a high-speed mixer at 110 ℃ for dehydration, 0.3kg of alkylphenol polyoxyethylene ether is added after high-speed stirring for 15 minutes, and the active calcium carbonate is prepared after high-speed stirring for 3 minutes.
65kg of the activated calcium carbonate, 0.15kg of the antioxidant 1010 and 45kg of the polyolefin resin are fed into a double-screw extruder for mixing and granulation.
Comparative example 4
Placing 55kg of calcium carbonate (D50 is 2 μm, D98 is not more than 10 μm) in a high-speed mixer at 110 ℃ for dehydration, stirring at high speed for 15 minutes, adding 0.3kg of fatty alcohol-polyoxyethylene ether, and stirring at high speed for 3 minutes to prepare the activated calcium carbonate.
65kg of the activated calcium carbonate, 0.15kg of the antioxidant 1010 and 45kg of the polyolefin resin are fed into a double-screw extruder for mixing and granulation.
Comparative example 5
55kg of calcium carbonate (D50 is 2 μm, D98 is not more than 10 μm) is dehydrated in a high-speed mixer at 110 ℃, stirred at high speed for 15 minutes, added with 0.15kg of PEG8000 and stirred for 3 minutes. 0.15kg of alkylphenol polyoxyethylene is added to prepare the active calcium carbonate.
65kg of active calcium carbonate, 0.15kg of antioxidant 1010 and 45kg of polyolefin resin are fed into a double-screw extruder in proportion for mixing and granulation.
Comparative example 6
55kg of calcium carbonate (D50 is 2 μm, D98 is not more than 10 μm) is dehydrated in a high-speed mixer at 110 ℃, stirred at high speed for 15 minutes, added with 0.15kg of PEG8000 and stirred for 3 minutes. Adding 0.15kg of fatty alcohol-polyoxyethylene ether, and stirring for 3 minutes to prepare the activated calcium carbonate.
65kg of active calcium carbonate, 0.15kg of antioxidant 1010 and 45kg of polyolefin resin are fed into a double-screw extruder in proportion for mixing and granulation.
The activated calcium carbonate prepared by the scheme is respectively taken and tested for the activation degree of the calcium carbonate.
The compositions constituting the polyolefin breathable film prepared by the scheme are respectively taken, prepared into a breathable film of 30gsm by a casting machine, and the pH value of the breathable film is respectively tested.
From the results of the examples and comparative examples, it can be seen that the addition of polyethylene glycol, polyethylene glycol type nonionic surfactant, and polyolefin resin powder can exert a synergistic effect, effectively increase the degree of activation of calcium carbonate, and reduce the pH of the polyolefin breathable film.
While the invention has been shown and described with reference to a few preferred embodiments thereof, various changes, omissions and additions to the form and detail thereof, may be made therein, without departing from the spirit and scope of the invention. It should be noted that certain modifications are possible within the scope of the claims and, therefore, the invention is intended to cover any variations or equivalents within the skill of the art to which it pertains that are within known or customary practice.
Claims (10)
1. A composition for forming a weakly basic polyolefin breathable film, which comprises 35 to 60 parts of calcium carbonate, 30 to 50 parts of polyolefin resin, 0.1 to 0.5 part of antioxidant and 0.1 to 0.5 part of polyethylene glycol, and is characterized in that the composition also comprises 0.1 to 0.3 part of polyethylene glycol type nonionic surfactant.
2. The composition of claim 1, wherein the polyolefin resin is one or a mixture of polyethylene resin, polypropylene resin, ethylene-propylene copolymer, ethylene-butylene copolymer.
3. The composition of claim 1, wherein the antioxidant is one of a phenolic antioxidant, a phosphite antioxidant, or a mixture thereof.
4. The composition according to claim 1, wherein the polyethylene glycol is one of PEG6000 and PEG8000 or their mixture.
5. The composition of claim 1 wherein said nonionic surfactant is a polyethylene glycol type nonionic surfactant.
6. The composition according to claim 5, wherein the polyethylene glycol type nonionic surfactant is one of fatty alcohol polyoxyethylene ether, alkylphenol polyoxyethylene ether or a mixture thereof.
7. The composition of claim 6 wherein the fatty alcohol-polyoxyethylene ether has an alkyl carbon chain having 18 to 24 carbon atoms and an EO addition number greater than 15.
8. The composition of claim 6, wherein the alkylphenol ethoxylates have an alkyl carbon chain attached to the benzene ring with a carbon number greater than 12 and an EO addition greater than 15.
9. A method of preparing a composition according to any preceding claim, comprising the steps of:
step 1, preparation of polyolefin resin powder: mixing polyolefin resin, and grinding the mixture by a grinding machine, wherein the grain diameter of the ground polyolefin resin powder is 10-30 mu m;
step 2, performing surface modification on calcium carbonate by adopting a dry process: putting 35-60 parts of calcium carbonate into a high-speed mixer at 110 ℃ for dehydration, adding 0.1-0.5 part of polyethylene glycol after 15 minutes, and stirring for 3 minutes; then adding 0.1-0.3 part of nonionic surfactant, and stirring for 3 minutes; then adding 10-20 parts of the polyolefin resin powder prepared in the step 1, stirring for 3 minutes, cooling to prepare active calcium carbonate, and adding the substances according to a certain proportion;
step 3, preparation of the composition: feeding 60-80 parts of active calcium carbonate, 0.1-0.5 part of antioxidant and 20-40 parts of polyolefin resin into a double-screw extruder in proportion for mixing and granulation.
10. A process for preparing the calcium carbonate of any of the claims into activated calcium carbonate, the process comprising:
step 1, preparation of polyolefin resin powder: mixing polyolefin resin, and grinding the mixture by a grinding machine, wherein the grain diameter of the ground polyolefin resin powder is 10-30 mu m;
step 2, performing surface modification on calcium carbonate by adopting a dry process: putting 35-60 parts of calcium carbonate into a high-speed mixer at 110 ℃ for dehydration, adding 0.1-0.5 part of polyethylene glycol after 15 minutes, and stirring for 3 minutes; then adding 0.1-0.3 part of nonionic surfactant, and stirring for 3 minutes; then adding 10-20 parts of the polyolefin resin powder prepared in the step 1, stirring for 3 minutes, cooling to prepare active calcium carbonate, and adding the above substances according to a certain proportion.
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