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Calcium carbonate product with excellent high filling performance

A technology of filling performance and calcium carbonate, which is applied in the field of UPVC formula system with high calcium carbonate filling, can solve the problems of decreased tensile properties of products, high application cost, product defects, etc., achieve no decrease in bending strength, reduce raw material costs, excellent The effect of impact resistance

Inactive Publication Date: 2017-11-21
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] As a hydrophilic and oil-repellent polar filler, calcium carbonate contains a large number of hydroxyl groups on the surface, has poor compatibility with PVC interface, and has poor dispersion performance in PVC matrix.
In the process of PVC processing, in order to reduce the cost, a large amount of calcium carbonate is filled, and at the same time, it is easy to cause defects inside the product and damage the mechanical properties, especially the impact strength.
[0003] In the current calcium carbonate high-filled UPVC formula, EVA, CPE and other elastomers are often blended with PVC to improve the impact strength of the product from the perspective of toughening the PVC matrix, but it does not improve the interfacial compatibility between PVC and calcium carbonate. , not only the dosage is large, but also the tensile properties of the product will be reduced
Or use a coupling agent to modify the surface of calcium carbonate. The end groups on both sides of the molecular chain of the coupling agent can chemically react with the calcium carbonate and the polymer matrix respectively, and connect the two to build a stable stress transfer layer, thereby increasing stress. The bonding strength of the interface between the two improves the performance of the blend system, but the application cost is higher

Method used

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  • Calcium carbonate product with excellent high filling performance
  • Calcium carbonate product with excellent high filling performance
  • Calcium carbonate product with excellent high filling performance

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The UPVC sheet is prepared by a twin-roller plastic mixer and a flat vulcanizer. The instruments used are the SK-160B twin-roller plastic mixer and the XQLB flat vulcanizer. The formula and preparation process are as follows:

[0018] (1) This example is a blank control group, and its formula is: 100 parts of PVC-SG5 resin, 70 parts of untreated calcium carbonate, 1 part of PE wax, 1 part of stearic acid, and 4 parts of compound stabilizer.

[0019] (2) Mix the UPVC formula system at high speed according to the above implementation formula, mix for 5-10 minutes and discharge.

[0020] (3) Put the homogeneously mixed material in step (2) into a double-roller plastic mixer, and knead with a triangular bag for 8 minutes, and place the obtained sheet in a 4mm thick mold for pressing UPVC sheets.

[0021] (4) Parameters of UPVC sheet pressing:

[0022] The hot pressing parameters are 175°C for the upper plate, 175°C for the lower plate, and a pressure of 15MPa. In the early...

Embodiment 2

[0028] Weigh 70 parts by weight (weight, the same below) of the calcium carbonate product of the present invention, replace the untreated calcium carbonate in the examples, and keep the other components of the formula unchanged. Mixing, kneading, and molding were carried out according to the above-mentioned plate preparation process. After the product was placed for 24 hours, the size of the standard sample was measured according to mechanics, and the impact, tensile, and bending sample were prepared by a universal cutting machine for mechanical performance testing.

[0029] Table 2 Example 2 test results

[0030]

Embodiment 3

[0032] Weigh 75 parts by weight (weight, the same below) of the calcium carbonate product of the present invention, replace the untreated calcium carbonate in the examples, and keep the other components of the formula unchanged. Mixing, kneading, and molding were carried out according to the above-mentioned plate preparation process. After the product was placed for 24 hours, the size of the standard sample was measured according to mechanics, and the impact, tensile, and bending sample were prepared by a universal cutting machine for mechanical performance testing.

[0033] Table 3 Example 3 test results

[0034]

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Abstract

The invention provides a calcium carbonate product with excellent high filling performance. The product is characterized by comprising the following materials in parts by weight: 100 parts of calcium carbonate, 3-9 parts of a treating agent, and 1-3 parts of a plasticizer. According to the invention, the prepared modified calcium carbonate can be used to highly fill an unplasticized poly(vinyl chloride) product, so that the costs are reduced, and at the same time the related performance of the product can be improved, the impact strength of the product can be greatly increased compared with that of a product which is filled with untreated calcium carbonate, and the tensile strength and the bending strength are also improved.

Description

technical field [0001] The invention is a calcium carbonate product with excellent high filling performance, which is mainly used for UPVC formula system with high calcium carbonate filling. Background technique [0002] As a hydrophilic and oleophobic polar filler, calcium carbonate contains a large number of hydroxyl groups on the surface, has poor interface compatibility with PVC, and has poor dispersion performance in PVC matrix. In the process of PVC processing, in order to reduce the cost, a large amount of calcium carbonate is filled, and at the same time, it is easy to cause internal defects of the product and damage the mechanical properties, especially the impact strength. [0003] In the current calcium carbonate high-filled UPVC formula, EVA, CPE and other elastomers are often blended with PVC to improve the impact strength of the product from the perspective of toughening the PVC matrix, but it does not improve the interfacial compatibility between PVC and calci...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L27/06C08K9/04C08K3/26
CPCC08L27/06
Inventor 李洪飞滕向苑会林
Owner BEIJING UNIV OF CHEM TECH