Calcium-carbonate-supported nucleating agent used for poly(lactic acid) crystallization and preparation method thereof

The technology of a crystal nucleating agent and calcium carbonate is applied to the crystal nucleating agent of polylactic acid, the crystal nucleating agent of calcium carbonate supported polylactic acid and its preparation field, and can solve the problems of low efficiency, uneven dispersion and high cost, Achieve the effect of improving nucleation efficiency, avoiding poor toughness and reducing dosage

Inactive Publication Date: 2011-10-12
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the compatibility of metal salts of such phosphorus-containing compounds with polylactic acid is also poor, easy to agglomerate, unevenly dispersed, low in efficiency, large in dosage, and high in cost, which will limit their application.

Method used

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  • Calcium-carbonate-supported nucleating agent used for poly(lactic acid) crystallization and preparation method thereof
  • Calcium-carbonate-supported nucleating agent used for poly(lactic acid) crystallization and preparation method thereof
  • Calcium-carbonate-supported nucleating agent used for poly(lactic acid) crystallization and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Example 1 In the reactor, the nano-calcium carbonate is dispersed in acetone or chloroform, and then mixed with phenylphosphonic acid in the following ratios of 5:1, 10:1, 20:1 and 40:1, at room temperature Stir and react for 4 hours, then centrifuge, and filter to obtain a white precipitate; wash the precipitate with acetone or chloroform respectively to remove unreacted phenylphosphonic acid, dry the precipitate, and phenylphosphonic acid and calcium carbonate react to form phenyl Calcium phosphate (PPCA) was loaded on the surface of calcium carbonate as an active ingredient to obtain calcium carbonate-loaded polylactic acid crystallization nucleating agents, respectively.

[0024] figure 1 and figure 2 It shows that phenylphosphonic acid reacts with nano-calcium carbonate to generate calcium phenylphosphonate, which is a supported nucleating agent loaded on the surface of nano-calcium carbonate.

[0025] A kind of usage of calcium carbonate loaded polylactic acid...

Embodiment 2

[0029] Embodiment 2 The calcium carbonate-loaded polylactic acid crystallization nucleating agent prepared in Example 1 of the present invention is compared with nano-calcium carbonate and calcium phenylphosphonate as nucleating agents, and differential scanning calorimetry is carried out to the nucleating ability of polylactic acid ( DSC) detection.

[0030] The DSC test method is: under the protection of nitrogen, rise from room temperature to 190°C at 50°C / min, stay for 2 minutes to eliminate the heat history, and then quickly cool down to the isothermal crystallization temperature at 45°C / min, where the isothermal crystallization temperature is set to 130°C and 140°C, isothermal crystallization at 130°C and 140°C respectively, test the half-crystallization time t 0.5 . The test results are shown in Table 1.

[0031] From Table 1, it can be concluded that although nano-calcium carbonate and calcium phenylphosphonate have all played a nucleating effect on polylactic acid a...

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Abstract

The invention discloses a calcium-carbonate-supported nucleating agent used for poly(lactic acid) crystallization and a preparation method thereof. The nucleating agent comprises the following composition formula: calcium carbonate and phenylphosphonic acid at a weight ratio of (5-40): 1, wherein calcium phenylphosphate generated by reaction of phenylphosphonic acid and calcium carbonate is used as an active ingredient and loaded on the surface of calcium carbonate, and phenyl phosphonic acid has a structural formula shown in the invention, in the formula, R1 and R2, the same or different, represent hydrogen atom, C1-10 alkyl or C1-10 alkoxycarbonyl. The nucleating agent can increase the effective nucleation sites formed by the high-degree dispersion of calcium phenylphosphate on the surface of calcium carbonate, thereby increasing nucleation efficiency as well as strengthening and toughening poly(lactic acid), avoiding the problem that poly(lactic acid) has poor toughness caused by non-supported nucleating agents, and facilitating the wide application of poly(lactic acid). The nucleating agent has a simple preparation method, low consumption of phenylphosphonic acid and significantly low cost.

Description

technical field [0001] The invention relates to a polylactic acid crystallization nucleating agent, in particular to a calcium carbonate-loaded polylactic acid crystallization nucleating agent and a preparation method thereof, belonging to the technical field of biodegradable polymer materials. Background technique [0002] Polylactic acid (PLA) is a thermoplastic aliphatic polyester. Since it is derived from renewable plant resources, has good biocompatibility and biodegradability, high mechanical strength and modulus, high transparency and processability, polylactic acid is considered to be an ideal candidate for petroleum-based plastics. It is of great significance to reduce environmental pollution and save oil resources, etc., and it has aroused widespread attention at present. [0003] Although polylactic acid-based plastic products have gradually appeared on the market in recent years, however, the crystallization rate of polylactic acid is slow, especially when proce...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L67/04C08K9/12C08K5/5317
Inventor 韩立晶韩常玉董丽松
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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