High tensile resin-based traffic guardrail structure composite material dedicated resin
A technology of guardrail structure and composite materials, which is applied in the field of roads and bridges, can solve the problems of inability to solve the contradiction between resin strength and elongation, low crosslinking density of unsaturated polyester, low tensile strength and hardness, etc., and achieve outstanding anti-corrosion Effects of impact toughness, increased flexibility, and improved performance
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[0020] The preparation of flexible resin is by introducing longer aliphatic chains into the molecular structure of unsaturated polyester or adding diols containing ether bonds, such as diethylene glycol adipate, so that the distance between unsaturated bonds in the molecular chain is drawn Open, synthesize a new type of unsaturated polyester, to obtain higher elongation at break; % of diisocyanate monomer reacts with unsaturated polyester to prepare polyurethane modified unsaturated polyester. A large number of hydrogen bonds are formed between the modified resin molecules, the force between the molecules is enhanced, and the resin obtains at least 100% elongation at break.
[0021] According to the characteristics of flexible resin, which is flexible but poor in strength, and its tensile strength is generally only about 5MPa, the method of adding flexible resin to saturated polyester resin to make high-toughness resin can be used to improve the strength of unsaturated polyest...
Embodiment 1
[0024] Add 72 kg of 1,2-propylene glycol and 27 kg of polyethylene glycol to a 500-liter stainless steel reactor equipped with an electric stirrer, an electric heater, a condenser, an oil-water separator, a thermometer, and an inert gas device. -800, 154 kg of maleic anhydride, 98 kg of phthalic anhydride. Slowly heat up until the reactant melts and becomes translucent, start stirring, and pass through nitrogen protection, continue to heat up to the reflux of the reactant, start to let the reflux return to the bottle overnight, and maintain this temperature for about 1 hour. Continue to heat up. The polyesterification polycondensation reaction starts at 180-190°C, and the reaction temperature does not rise any more when water comes out. After maintaining the reaction for 30 minutes, take water from the oil-water separator and continue to raise the temperature. The heating rate during the reaction process can be controlled by the take-out rate of the condensate in the oil-wate...
Embodiment 2
[0027] Add 83 kg of 1,2-propylene glycol and 36 kg of polyethylene glycol to a 500-liter stainless steel reactor equipped with an electric stirrer, an electric heater, a condenser, an oil-water separator, a thermometer, and an inert gas device. -2000, 131 kg of maleic anhydride, 102 kg of phthalic anhydride. Slowly heat up until the reactant melts and becomes translucent, start stirring, and pass through nitrogen protection, continue to heat up to the reflux of the reactant, start to let the reflux return to the bottle overnight, and maintain this temperature for about 1 hour. Continue to heat up. At 180-190°C, the esterification reaction starts, and water comes out, and the reaction temperature does not rise any more. After maintaining the reaction for 30 minutes, take water from the oil-water separator to continue to raise the temperature. The heating rate during the reaction process can be controlled by the take-out rate of the condensate in the oil-water separator. Take ...
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