Surface modification method of calcium carbonate special for PVC film
A PVC film and surface modification technology, which is applied in the field of surface modification of calcium carbonate for PVC film, can solve the problems of less calcium carbonate addition and the decrease of impact strength of PVC film, and achieve enhanced compatibility and improved compatibility , the effect of improving the mechanical properties
Inactive Publication Date: 2020-08-04
JIANGSU QUNXIN POWDER TECH CO LTD
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- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
[0005] The existing calcium carbonate for PVC film has the following problems: due to the finer particles of conventional calcium carbonate powder and larger surface area, these particles are prone to agglomeration during the blending process with the polymer, resulting in a decrease in the impact strength of the PVC film , so that the addition of calcium carbonate is less
Method used
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Examples
Experimental program
Comparison scheme
Effect test
Embodiment 1
[0018] Carry out graded processing of calcium carbonate to obtain the primary product of calcium carbonate powder with a particle size D50 of 2 to 3 μm, place it in a reaction kettle, raise it from room temperature to 105°C, stir at high speed for 3 to 5 minutes, add surface modifiers, Initiator dicyclohexyl peroxydicarbonate, crosslinking agent trimethylolpropane tris (3- aziridinyl propionate), aluminum triacetylacetonate, raise the temperature from 105°C to 125°C, stir at high speed for 3 ~5min; then add the catalyst, turn to low-speed stirring for 3-5min, the temperature rises from 125°C to 135°C, stir for 3-5min and then discharge to obtain modified calcium carbonate. The surface modifier is triethanolamine oleic acid soap, and the catalyst is a molecular sieve catalyst.
[0019] Modified calcium carbonate, the spectrum under the microscope is as follows figure 1 shown.
Embodiment 2
[0026] The procedure is roughly the same as in Example 1, except that the surface modifier is sodium polyacrylate.
Embodiment 3
[0028] The procedure is roughly the same as in Example 1, except that the surface modifier is oxidized polyethylene.
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Abstract
The invention discloses a surface modification method of calcium carbonate special for a PVC film. The method comprises the following steps: carrying out graded processing treatment on calcium carbonate; obtaining a calcium carbonate powder primary product with a particle size D50 of 2-3 [mu] m; putting the mixture into a reaction kettle, raising the temperature from room temperature to 105 DEG C,stirring at a high speed for 3-5 minutes, adding a surface modifier, an initiator dicyclohexyl peroxydicarbonate, a cross-linking agent trimethylolpropane tri (3-aziridinyl propionate) and aluminum triacetylacetonate, raising the temperature from 105 DEG C to 125 DEG C, and stirring at a high speed for 3-5 minutes; and adding a catalyst, stirring at a low speed for 3-5 minutes, heating from 125 DEG C to 135 DEG C, stirring for 3-5 minutes, and discharging to obtain the modified calcium carbonate. According to the method, the mechanical property of the modified calcium carbonate is remarkablyimproved, the compatibility of the modified calcium carbonate with the PVC film is improved, and meanwhile, a synergistic effect is achieved, so that the surface of the modified calcium carbonate is oleophylic and hydrophobic, the compatibility of the modified calcium carbonate with plastic is enhanced, the dispersity of the modified calcium carbonate in the PVC film is improved, the loose stacking density is effectively reduced, and the mechanical property of the modified calcium carbonate is improved.
Description
technical field [0001] The application relates to the field of fine chemicals, in particular to a method for surface modification of calcium carbonate specially used for PVC films. Background technique [0002] PVC film, the main component is polyvinyl chloride, and other components are added to enhance its heat resistance, toughness, ductility, etc. The top layer of this surface film is lacquer, the main component in the middle is polyvinyl chloride, and the bottom layer is back-coated adhesive. [0003] Adding special calcium carbonate to PVC film can not only reduce material cost, but also improve some physical properties of the film, such as improving the air permeability and surface gloss of PVC film. [0004] Ground calcium carbonate is a widely used inorganic filler. Because the surface has many hydroxyl groups, water is easily absorbed, making the surface of heavy calcium carbonate particles hydrophilic and oleophobic, and polar. It is difficult to use non-polar org...
Claims
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IPC IPC(8): C08K9/04C08K3/26C08J5/18C08L27/06
CPCC08J5/18C08J2327/06C08K3/26C08K9/04C08K9/08C08K2003/265C08K2201/003
Inventor 张国如
Owner JIANGSU QUNXIN POWDER TECH CO LTD