Branched copolymers as additives for reducing viscosity of mineral binder compositions
A technology of mineral binder and copolymer, which is applied in the field of mineral binder composition and solidified molded body, can solve the problems of mineral binder water requirement reduction, extra air introduction, etc., and achieve simple synthesis and increased flow rate Effect
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[0045] In a preferred embodiment, the copolymers according to the invention are prepared without the use of epichlorohydrin. The preparation method therefore does not contain epichlorohydrin. Therefore, the copolymers according to the present invention can preferably be prepared by a process comprising the following steps:
[0046] 1) is optionally selected from the general formula R 1 - Alcohol, amine, carboxylic acid or amide starter S of XH with alkoxylating agent and / or halohydrin or haloamine Hal-R 2 -XH reaction, where R 1 =C1-C18 alkyl, C2-C18 alkylene, C3-C10 cycloalkyl, C6-C30 aryl, C7-C30 aralkyl or C1-C18 carbonyl, X=O or NH, Hal=Cl, Br or I, and R 2 =C1-C16 alkyl,
[0047] 2) is selected from the general formula R 1 The alcohol, amine, carboxylic acid or amide starting material S of -XH or the reaction product from step 1) is reacted with glycidol or a mixture of glycidol and an alkoxylating agent, wherein R 1 =C1-C18 alkyl, C2-C18 alkylene, C3-C10 cycloalky...
Embodiment 1
[0239] Example 1 - Preparation of Copolymers Used
[0240] Preparation of C-1
[0241] Step 1: Using N 2 In a gas-inertized reactor, 4 g (0.074 mol) of sodium methoxide were dissolved in 576 g (8 mol) of methallyl alcohol and heated to 100°C. Subsequently, 1760 g (40 mol) of ethylene oxide were metered in within 5 hours. The temperature is maintained here at 100 to 140° C. and the pressure at 1 to 3 bar. After the end of the metered addition, the reaction mixture was stirred at 140° C. for 2 hours. The mixture was then cooled to 30°C.
[0242] Step 2: Using N 2 In a gas-inertized reactor, 123 g (0.42 mol) of the mixture from step 1) were admixed with 0.54 g (0.01 mol) sodium methoxide and heated to 130°C. Subsequently, 93 g (1.26 mol) of glycidol were metered in within 30 minutes. Here the temperature is kept at 130 to 140° C. and the pressure is kept at 1 to 3 bar. After the end of the metered addition, the reaction mixture was stirred at 140° C. for 2 hours. It was ...
Embodiment 2
[0255] Example 2 - Paste Test
[0256] A dry mix was prepared consisting of 150 g of cement (CEM I 42.5N from Vigier Holding AG), 5.8 g of microsilica (from Sika Schweiz AG) -HR / -TU), 69.2g blast furnace slag (Regen GGBS from HansonUK) and 41.5g limestone (Nekafill 15 from Kalkfabrik Netstal AG). To prepare a dry blend, the ingredients were dry blended in a Hobart mixer for 30 seconds. The additives shown in Table 2 were added to this dry blend, each additive being dissolved in 60 g of water. Mixing was continued for 30 seconds for stage 1 and 3.5 minutes for final stage 2.
[0257] The run-off time according to DIN EN 12350-9 and the degree of spreading according to DIN EN 12350-5 of the cement paste obtained are measured. The time required for complete run-off of 210 g of each mixture V1-V3 (not according to the invention) or E1-E3 (according to the invention) was measured, respectively. Table 2 below summarizes the results.
[0258] Table 2: Results of the paste test ...
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