Heterocyclic organic matter and polyhydric alcohol composite PVC (polyvinyl chloride) heat stabilizing agent and preparation method thereof
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A technology of heterocyclic organic compounds and heat stabilizers, applied in the field of PVC heat stabilizers, can solve problems such as poor long-term thermal stability, achieve the effects of good thermal stability, simple preparation process, and increase long-term thermal stability
Inactive Publication Date: 2017-05-31
HUBEI UNIV OF TECH
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[0004] The purpose of the present invention is to solve the above problems, aiming to provide a kind of shortcoming that can overcome the "zinc burning" phenomenon and poor long-term thermal stability of traditional calcium-zinc heat stabilizers, and has the advantages of environmental protection, non-toxicity, high efficiency, etc., and at the same time, the compound system can Produce synergistic effect, improve the thermal stability of PVC, improve the thermal stability of PVC heterocyclic organic matter and polyol composite PVC heat stabilizer and preparation method thereof
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[0023] The preparation method of the present invention is to put PVC, composite heat stabilizer, and calcium carbonate into a high-speed mixer and mix them evenly; carry out mixing on a double-roll mill at 170°C, fully mix and plasticize for 5 minutes, and then lower the sheet, the thickness of the lower sheet 1mm, then performance test.
[0024] The speed of the high-speed mixer used: 1440rpm, the temperature: 60-80°C, and the mixing time: 5min.
[0025] The performance test adopts the static heat aging method: cut the mixed PVC sample into 4cm×2cm samples, put them in a 180°C oven, take out a sample every 5 minutes, take pictures, record and compare the addition of different types of stabilizers The discoloration of PVC samples with aging time.
[0026] Performance test Congo red discoloration method: According to GB.T2917.1-2002, cut the prepared PVC sample into a granular sample with a size of 2mm×2mm×1mm, put it into a test tube, and the height of the sample is 50mm. Th...
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[0033] Table 1 PVC composite heat stabilizer comparative example and embodiment
[0034]
[0035]
Embodiment 1
[0037] 1) Weigh 1000g PVC (SG-5), 150g superfine light calcium carbonate, 5g zinc stearate, 3g 4-amino-1,5-dimethyl-2-phenyl-3-pyrazolone , 5 g of sorbitol, and 16 g of polyethylene wax were plasticized on an open mill at 170° C. for 5 minutes and then released into sheets with a thickness of 1 mm.
[0038] 2) Mix the homogeneously mixed mixture in step 1) on a double-roll mill at 170°C, fully mix and plasticize for 5 minutes, and then release the sheet, the thickness of which is 1mm;
[0039] 3) Performance test: use the static heat aging method to test the discoloration of the sample with aging time, or use the Congo red discoloration method to test the thermal stability time of the sample.
[0040] Static heat aging results see figure 1 , Congo red discoloration time is shown in Table 2.
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Abstract
The invention relates to a heterocyclic organic matter and polyhydric alcohol composite PVC (polyvinyl chloride) heat stabilizing agent and a preparation method thereof. A composite thermal stabilizing agent is prepared from the following ingredients in parts by mass through being metered by 100 mass parts of PVC: 15 parts of calcium carbonate, 0.5 to 0.9 part of zinc stearate, 0.1 to 0.5 part of pyrazolone type heat stabilizers, 0.1 to 0.5 part of polyols and 1.6 parts of lubricating agents. According to the preparation method, the PVC, the composite heat stabilizers, the composite heat stabilizers, the calcium carbonate and the lubricating agents are put into a high-speed mixing machine to be uniformly mixed; blending is performed on a 170 DEG C double-roller mill mixer; after the sufficient mixing and plasticization for 5 min, sheet cutting is performed, and the sheet thickness is 1mm; then, a static state heat aging method and a Congo red color change method are used for performing performance test. The pyrazolone type thermal stabilizing agents are used for replacing active chlorine atoms; the generation capability of the conjugated polyene sequence is blocked; the zinc burning phenomenon can be delayed by using polylol; the stability is high. The preparation method has the advantages that the preparation process is simple; the environment is protected; no toxicity exists; the efficiency is high, and the like.
Description
technical field [0001] The invention relates to the technical field of PVC heat stabilizers, in particular to a heterocyclic organic compound and polyol composite heat stabilizer and a preparation method thereof. Background technique [0002] Polyvinyl chloride (PVC) is an important general-purpose thermoplastic, which is widely used in many fields due to its superior performance and low price. However, due to the defective structure on the PVC molecular chain, such as allyl chloride group, end group, oxygen-containing group, head-to-head structure, etc., it is easy to degrade during the heating process, resulting in serious discoloration and mechanical damage to the surface of PVC material. Performance deterioration, so it is necessary to suppress the thermal degradation of PVC by adding a suitable heat stabilizer. PVC heat stabilizers generally replace the active chlorine atoms on the PVC chain to prevent further HCl removal reaction, or absorb the HCl gas removed from th...
Claims
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Application Information
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