Methacrylate monomer for dental restoration material and preparation method thereof
A technology of methacrylate and methacrylic acid, applied in the field of methacrylate monomers for dental restorative materials and their preparation, can solve problems such as allergies, affect the safety of photosensitive resins, cause inflammation, etc., and reduce cytotoxicity Effect
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Embodiment 1
[0027] A kind of reaction equation of preparation process of methacrylate monomer for dental restorative material is as follows: wherein amine compound is piperazine
[0028]
[0029] Glycidyl methacrylate reacts with acrylic acid to open epoxy under the action of a catalyst, and methacrylate containing acrylic acid double bond is prepared; the Michael addition reaction activity of acrylate double bond and methacrylate double bond with amine The difference is to allow the amino group to react with the highly reactive acrylate double bond to prepare a difunctional methacrylate double bond. The prepared reactive diluent contains a tertiary amine structure, which can be used as a reactive amine in the photocuring initiation system. agent.
Embodiment 2
[0031] A preparation method of methacrylate monomer for dental restorative material, comprising the following steps:
[0032] (1) Weigh 64g of glycidyl methacrylate, add 3.0g of tetramethylammonium chloride and 0.1g of hydroxyanisole, and stir in a three-necked flask, heat up to 90°C, and use a constant-pressure dropping funnel to add to the reaction system Add 37.8g of acrylic acid dropwise to the mixture, after the dropwise addition, continue to react for 4h and then test the acid value, when the acid value is less than 10mg KOH / g, stop the reaction;
[0033] (2) After cooling, add 23.1 g of N,N'-dimethylethylenediamine dropwise to the reaction system in an ice bath. After the dropwise addition, raise the temperature to 60°C and continue the reaction for 2 hours;
[0034] (3) After the reaction finishes, cool down to room temperature, wash the product 2-3 times with deionized water, then wash 2-3 times with 1wt% NaOH aqueous solution, and finally wash with deionized water to...
Embodiment 3
[0038] A preparation method of methacrylate monomer for dental restorative material, comprising the following steps:
[0039] (1) Weigh 64g of glycidyl methacrylate, add 1.2g of tetrabutylammonium bromide, 0.5g of hydroxyanisole, and stir in a three-necked flask to raise the temperature to 110°C. 43.2g of acrylic acid was added dropwise, after the dropwise addition, the acid value was tested after continuing to react for 4h, and when the acid value was less than 10mg KOH / g, the reaction was stopped;
[0040] (2) Add 30.6 g of N,N'-dimethyl-1,3-propanediamine dropwise to the reaction system under ice-bath conditions. After the dropwise addition, raise the temperature to 80°C and continue the reaction for 2 hours;
[0041] (3) After the reaction finishes, cool down to room temperature, wash the product 2-3 times with deionized water, then wash 2-3 times with 1wt% NaOH aqueous solution, and finally wash with deionized water to neutrality, transfer it to a beaker, Add an appropri...
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