Hyperbranched polycarboxylate water reducer and preparation method thereof
A technology for converting polycarboxylate and hyperbranched polyester is applied in the field of polycarboxylate superplasticizer for concrete, which can solve the problems of easy secondary pollution, difficult preparation of polycarboxylate superplasticizer, high price, etc. The effect of many structures, which is beneficial to large-scale production and low cost
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[0019] The embodiment of the present invention also provides a preparation method of hyperbranched polycarboxylate water reducer, the specific synthesis includes the following steps:
[0020] S1. Synthesis of AB 2 type monomer;
[0021] Mix and stir the acid anhydride containing double bond, amine compound and solvent at room temperature for 30-240 minutes, then remove the solvent to obtain AB 2 type monomer. Acylation reaction of acid anhydrides containing double bonds and amine compounds at room temperature gives AB 2 type monomer.
[0022] At the same time, when the acylation reaction is carried out, a protective gas is introduced for protection to prevent the above raw materials from reacting with substances such as oxygen or carbon dioxide in the air, thereby affecting the formation of monomers.
[0023] Further, the mass ratio of the double bond-containing anhydride to the amine compound is 1:0.95-1.1. The adoption of the above ratio can ensure that the acylation re...
Embodiment 1
[0047] A hyperbranched polycarboxylate water reducer provided in this example has a structural formula as shown below.
[0048]
[0049] Wherein, R is a vinyl group.
[0050] This embodiment also provides a method for preparing the above-mentioned hyperbranched polycarboxylate water reducer:
[0051] S1. Synthesis of AB 2 type monomer;
[0052] With thermometer, N 2 Add 15g of succinic anhydride, 15.0g of diethanolamine and 50mL of N,N-dimethylacetamide into the three-neck round bottom flask with gas inlet and condensing device, mix and stir at room temperature for 30min, then distill under reduced pressure to obtain AB 2 type monomer.
[0053] S2, synthesizing a hyperbranched polyester intermediate;
[0054] With thermometer, N 2 Add 30g AB 2 Type monomer, 50mL cyclohexane, after stirring evenly, heat the system to 80°C, continue to stir and react for 4h, and distill under reduced pressure to obtain the hyperbranched polyester intermediate.
[0055] S3, synthesizin...
Embodiment 2
[0058] This example provides a hyperbranched polycarboxylate water reducer, which has the same structural formula as the hyperbranched polycarboxylate water reducer in Example 1.
[0059] This example also provides a method for preparing the above-mentioned hyperbranched polycarboxylate water reducer. Compared with the preparation provided in Example 1, the difference is that in the preparation method provided in this example, S1, synthetic AB 2 The operating conditions of the type monomers change, and the rest remain unchanged.
[0060] synthetic AB 2 The dosage of diethanolamine is 15.7g when the type monomer is used, and the mixing and stirring time at room temperature is 60min.
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