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Aminouracil maleamate and preparation method as well as polyvinyl chloride heat stabilizer

A technology of maleamic acid salt and aminouracil, which is applied in the fields of polyvinyl chloride heat stabilizer, aminouracil maleamic acid salt and preparation field, can solve the problem of poor compatibility of PVC, heavy smell of ammonia water, and difficulty in taking into account the initial and long-term Stability and performance issues

Inactive Publication Date: 2018-08-10
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] CN103183644A discloses a zinc salt of uracil and its application as a heat stabilizer for PVC. The uracil is 2,4-dihydroxypyrimidine in an amount of 0.1 to 5 parts by mass added to 100 parts of PVC. Ammonia solution reacts with zinc nitrate, then precipitates with isopropanol, and washes with ethanol. There are many problems in the preparation process, large amount of waste liquid and heavy ammonia smell.
[0009] In the above invention, the aminouracil compounds used belong to small molecular compounds. In the application process, there are problems of poor compatibility with PVC and easy blooming and precipitation. At the same time, the preparation process is complicated, not environmentally friendly, or difficult to Taking into account the initial and long-term stability

Method used

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  • Aminouracil maleamate and preparation method as well as polyvinyl chloride heat stabilizer
  • Aminouracil maleamate and preparation method as well as polyvinyl chloride heat stabilizer
  • Aminouracil maleamate and preparation method as well as polyvinyl chloride heat stabilizer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] 1. Preparation of zinc aminouracil maleamate

[0039] After pouring maleic anhydride (MAH) into the flask, heat and stir and blow nitrogen, then add semi-uracil compounds, the temperature rises to 70°C, and react for 8 hours; then, add metal compounds and cyclohexane, and heat up to 90°C Reaction 4h, vacuum drying, that is.

[0040] Wherein, the reaction ratio of maleic anhydride and semiuracil compound is 1:1, the molar ratio of metal compound and semicarbazide compound is 1:1, and cyclohexane accounts for 20% of the mass of metal compound;

[0041] The aminouracil compound is selected as 1,3-dialkyl-6-aminouracil; the metal compound is selected as zinc oxide.

[0042] 2. Preparation of polyvinyl chloride (PVC) material

[0043] Formula: 100 parts of PVC, 3 parts of zinc aminouracil maleamate, 2 parts of hydrotalcite, 1 part of stearic acid, 4 parts of calcium carbonate, 4 parts of dioctyl phthalate (DOP), the parts are by weight share;

[0044] Weigh the raw mater...

Embodiment 2

[0046] 1. Preparation of calcium aminouracil maleamate

[0047] After pouring maleic anhydride (MAH) into the flask, heat and stir and pass nitrogen gas, then add aminouracil compounds, the temperature rises to 90°C, and react for 4 hours; then, add metal compounds and toluene, heat up to 110°C, and react for 2.5 hours h, vacuum-dried, that is.

[0048] Wherein, the reaction ratio of maleic anhydride and aminouracil compound is 2:1.5, the molar ratio of metal compound and aminouracil compound is 1:1.5, and toluene accounts for 5% of metal compound quality; Metal compound is selected as calcium oxide .

[0049] 2. Preparation of polyvinyl chloride (PVC) material

[0050] Recipe: 100 parts of PVC, 3 parts of aminouracil calcium maleamate, 2 parts of hydrotalcite, 1 part of stearic acid, 4 parts of calcium carbonate, 4 parts of dioctyl phthalate (DOP), the parts are by weight share;

[0051] Weigh the raw materials according to the formula, and mix them evenly with a stirrer to...

Embodiment 3

[0053] 1. Preparation of tin aminouracil maleamate

[0054] After pouring maleic anhydride (MAH) into the flask, heat and stir and blow nitrogen, then add semi-uracil compounds, the temperature rises to 120°C, and react for 2h; then, add metal compounds and toluene, raise the temperature to 130°C, react for 1h , dried in vacuum, that is.

[0055] Wherein, the reaction ratio of maleic anhydride and aminouracil compound is 1:1.5, the molar ratio of metal compound and aminouracil compound is 1:1.5, and toluene accounts for 10% of the mass of metal compound; the metal compound is selected as tin oxide .

[0056] 2. Preparation of polyvinyl chloride (PVC) material

[0057] Recipe: 100 parts of PVC, 3 parts of uracil aminouracil tin maleamate, 2 parts of epoxidized soybean oil, 1 part of stearic acid, 4 parts of calcium carbonate, 4 parts of dioctyl phthalate (DOP), the number of parts is parts by weight;

[0058] Weigh the raw materials according to the formula, and mix them ev...

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Abstract

The invention belongs to the field of fine chemistry and in particular relates to aminouracil maleamate and a preparation method as well as a polyvinyl chloride (PVC) heat stabilizer. The invention provides the aminouracil maleamate; the structure of the aminouracil maleamate is shown as a formula (I), wherein each of R1 and R2 is independently selected from hydrogen, alkyl and substituted alkyl;Me is selected from Zn, Mg, Ca, Ba and Sn. The aminouracil maleamate provided by the invention can be used for inhibiting further degradation and coloring of polyvinyl chloride; meanwhile, the aminouracil maleamate is bonded on a PVC molecular chain through a chemical bond and the stability in a product is improved, so that uracil is not easily separated out; the aminouracil maleamate belongs to amultifunctional heat stabilizer and has initial-stage and long-period stable effects; the problems that an existing heat stabilizer has poor compatibility with PVC and is easily bloomed and separatedout can be solved. The formula (I) is shown in the description.

Description

technical field [0001] The invention belongs to the field of fine chemicals, and in particular relates to aminouracil maleamic acid salt, a preparation method and a polyvinyl chloride heat stabilizer. Background technique [0002] As the second largest general-purpose plastic in the world, polyvinyl chloride (PVC) has the characteristics of corrosion resistance, flame retardancy, and good insulation performance. It is widely used in industrial construction, medical care, daily necessities, and agriculture. However, since PVC is generally the product of free radical polymerization, there are certain unstable defect structures in the molecular chain, such as allyl chloride, tertiary chlorine, etc., which cause the decomposition temperature of PVC to be lower than the processing temperature, and are easily degraded under processing conditions. The release of HCl gas makes the color of the final product poor, while the mechanical properties decrease, reducing the use value. The...

Claims

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Application Information

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IPC IPC(8): C07D239/545C08L27/06C08K13/02C08K5/3462C08K3/26C08K5/09C08K5/12
CPCC07D239/545C08K3/26C08K5/09C08K5/12C08K5/3462C08K13/02C08L2201/08C08L27/06
Inventor 廖正福曹慧娟陈庆华王新波林泽鹏
Owner GUANGDONG UNIV OF TECH
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