Weather-proof sealant
A weather-resistant adhesive and nano-calcium carbonate technology, which is applied in adhesives, adhesive additives, non-polymer adhesive additives, etc., can solve the problems of poor water resistance of silicone sealants, poor mechanical properties of sealants, and high crosslinking density. , to reduce the modulus, improve the wear resistance, and reduce the cohesive energy density
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Embodiment 1
[0042] This embodiment prepares a kind of functional additive, and the steps are as follows:
[0043] Step S1. Add 1 mmol of piperazine hexahydrate, 2.3 g of methyl acrylate and lithium perchlorate into a three-necked flask, and stir for 1 h at room temperature. After the reaction, add deionized water to wash, leave to separate and separate, and spin the organic phase. Excessive methyl acrylate was evaporated to obtain intermediate 1, wherein the amount of lithium perchlorate was 3% of the total mass of piperazine hexahydrate and methyl acrylate;
[0044] Step S2, add 0.25g of intermediate 1, 2.2mmol of 2-hydroxyethyl disulfide, 0.025g of sodium methoxide, 3A molecular sieve and 10mL of anhydrous toluene into a three-necked flask, and raise the temperature to reflux for 10 hours at a rotation speed of 100r / min. After the reaction, the toluene was removed by distillation under reduced pressure, and the distilled product was washed with deionized water at 40°C, extracted with et...
Embodiment 2
[0047] This embodiment prepares a kind of functional additive, and the steps are as follows:
[0048] Step S1. Add 1 mmol of piperazine hexahydrate, 2.5 g of methyl acrylate and lithium perchlorate into a three-necked flask, and stir for 1.5 h at room temperature. After the reaction, add deionized water for washing, and let the organic phase Excessive methyl acrylate was removed by rotary evaporation to obtain intermediate 1, wherein the amount of lithium perchlorate was 4% of the total mass of piperazine hexahydrate and methyl acrylate;
[0049] Step S2: Add 0.25g of intermediate 1, 2.2mmol of 2-hydroxyethyl disulfide, 0.025g of sodium methoxide, 3A molecular sieve and 12mL of anhydrous toluene into a three-necked flask, and heat up to reflux for 11 hours at a rotational speed of 120r / min , after the reaction, the toluene was removed by distillation under reduced pressure, the distilled product was washed with deionized water at 40°C, the organic phase was collected by extrac...
Embodiment 3
[0052] This embodiment prepares a kind of functional additive, and the steps are as follows:
[0053] Step S1. Add 1 mmol of piperazine hexahydrate, 2.7 g of methyl acrylate and lithium perchlorate into a three-necked flask, and stir for 2 hours at room temperature. After the reaction, add deionized water to wash, leave to separate and separate, and spin the organic phase. Excessive methyl acrylate was evaporated to obtain intermediate 1, wherein the amount of lithium perchlorate was 5% of the total mass of piperazine hexahydrate and methyl acrylate;
[0054] Step S2: Add 0.25g of intermediate 1, 2.2mmol of 2-hydroxyethyl disulfide, 0.025g of sodium methoxide, 3A molecular sieve and 15mL of anhydrous toluene into a three-necked flask, and heat up to reflux for 12 hours at a rotational speed of 180r / min , after the reaction, the toluene was removed by distillation under reduced pressure, the distilled product was washed with deionized water at 40°C, the organic phase was collec...
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