Halogen-free flame-retardant macromolecular damping spring and preparation method thereof

Abstract

The invention discloses a halogen-free flame-retardant macromolecular damping spring which is prepared by mixing dimethyl terephthalate, 9,10-dihydro-9-oxo-10-phosphaphenanthrene-10-oxide-dimethyl itaconate, 1,4-butanediol, polytetrahydrofuran, a catalyst and an antioxidant; adding all the components into a polymerization kettle according to a certain ratio; carrying out transesterification and condensation polymerization reaction to obtain a polyether-co-ester elastomer, wherein the polyether-co-ester elastomer has the hardness of D50-D60, and the polyether-co-ester elastomer is proven to have number-average molecular weight of 29000-32000 through GPC tests realized by using a trichloromethane solvent; and carrying out injection molding on the polyether-co-ester elastomer to obtain the macromolecular damping spring with structure and elastomer material bearing and rebounding effects. The halogen-free flame-retardant macromolecular damping spring has the advantages that the production process is simple, the production efficiency is high, the product percent of pass is relatively high, and the halogen-free and flame-retardant requirements are met, so that the halogen-free flame-retardant macromolecular damping spring can be widely used as a buffering device in the fields of vehicles, engineering machines, elevators and the like.

Description

technical field [0001] The invention belongs to the technical field of damping springs, and in particular relates to a halogen-free flame-retardant polymer damping spring used as a buffer in the fields of vehicles, engineering machinery, elevators and the like and a preparation method thereof. Background technique [0002] In order to improve the comfort and safety of the vehicle, reduce the impact force when the train stops, and reduce the damage to the car body, the vehicle is generally equipped with a coupler buffer device at the car body joint. In order to reduce the impact force in extreme out-of-control situations in construction machinery, elevators and other fields, buffer devices are also generally used for protection. The existing domestic buffer devices are mainly of the following types: steel spring buffer devices, rubber buffer devices, hydraulic buffer devices, although the above buffer devices basically meet the requirements for use, there are also complex str...

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Problems solved by technology

However, this type of copolymer has poor thermal stability and is not flame retardant. It will burn more violently when it encounters oxygen at higher temperatures.

CN102807739A and CN102807738A patents introduce a halogen-free flame-retardant copolyether ester, but the halogen-free flame-retardant copolyether ester uses an additive-type phosphinate flame retardant, which has a large amount of addition, uneven dispersion, and decreased elastomer performance. Disadvantages such as large amplitude

In addition, the patent CN1806134A introduces a polyester elastomer made of polypropylene oxide diol derivatives as the soft segment. The elastomer is extruded from a rod through an extruder and then annealed to obtain a compression spring. The preparation The steps of the method are relatively complicated, and this document only records that the compression spring has the problem of compressing more than 30% without breaking, and there is no relevant record about other properties of the compression spring

CN102432856A introduces a copolyether ester containing a soft segment of hydroxyl-terminated polybutadiene, which is mixed with an auxiliary agent and then injected into an oval shape, and then molded into a buffer gasket. Although the pressure resistance of the buffer gasket meets the technical requirements, it does not Meet the requirements of flame retardancy, and the molding process is complex and the cycle is long

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