Preparation method of flame-retardant PET polyester sheet suitable for furniture surface veneering

Abstract

The invention discloses a preparation method of a flame-retardant PET (Polyethylene Terephthalate) polyester sheet suitable for furniture surface veneering. The preparation method comprises the following steps: carrying out primary esterification reaction on purified terephthalic acid and ethylene glycol; when the acid value of the primary esterification reaction system reaches 28-35 mgKOH / g, adding a polyphosphonate flame retardant and replenishing fresh ethylene glycol, and then carrying out secondary esterification reaction; and when the acid value of the secondary esterification reaction system reaches 12-15mgKOH / g, sequentially carrying out pre-polycondensation reaction and final polycondensation reaction on the esterified material to prepare the flame-retardant PET polyester chip, preparing the flame-retardant PET polyester chip into a sheet with the thickness of 0.4 mm-1mm, and then carrying out bidirectional micro-stretching and heat setting. Experiments prove that the flame-retardant PET polyester sheet with excellent flame retardance, temperature resistance, wear resistance and light transmission can be obtained by the preparation method, the flame retardance is lasting, and the application requirement of the flame-retardant PET polyester sheet serving as a furniture surface veneer can be well met.

Description

technical field [0001] The invention relates to a preparation method of a flame-retardant PET polyester sheet suitable for furniture surface veneer, and belongs to the technical field of functional material preparation. Background technique [0002] Whether it is solid wood furniture or artificial wood furniture, there is usually a problem that it is easy to burn and not resistant to fire. In order to realize the fireproof function of furniture, in the prior art, fire retardant treatment is applied to the board for making furniture (ie: coating the surface of the board with a flame retardant or immersing the board in a flame retardant liquid), and some are coating the surface of the furniture. There are flame retardant coatings, and flame retardant sheets are pasted on the surface of the furniture; although the above treatment methods can improve the fire protection function of the furniture to a certain extent, there will be problems such as unenvironmental protection, comp...

AI Technical Summary

Problems solved by technology

But as we all know, PET polyester is a flammable material, easy to burn, poor temperature resistance, and when it burns, it has a large heat release rate, high calorific value, and fast flame propagation speed, so that the application of PET polyester in furniture is limited.

[0004] Existing technologies for the preparation of flame-retardant polyester films in the prior art mainly involve three types: the first is to coat the surface of the film with a polymer material coating with flame-retardant groups. Problems such as heat treatment or decomposition will make the product unstable, and this method also has problems such as pollution; the second is to use a blended flame retardant to blend with polyester chips and extrude to make a flame-retardant masterbatch, then melt extruded with polyester chips, and finally pull the film. At present, the main research is to mix organic bromine, phosphorus, and inorganic small molecule flame retardants into the polyester film. Although this method can To a certain extent, the flame retardant performance is improved, but due to the large amount of these small molecular compounds added, the compatibility with the resin substrate is poor, making the mechanical properties of the film unstable, and the migration and precipitation of the flame retardant will occur after long-term use, which will affect the film products. The appearance and durability of the flame-retardant effect; the third is to use a copolymer-type flame retardant to copolymerize with terephthalic acid and ethylene glycol to prepare flame-retardant polyester chips, and then pull the film, although this copolymerization type Flame-retardant polyester film has a lasting flame-retardant effect, but the inventors have found in research that the sheet made of this copolymerized flame-retardant polyester chip not only has poor temperature resistance (difficult to reach 100 ° C), but also has a The surface is prone to heat deformation when used, and has poor wear resistance and is not resistant to scratches. It is prone to scratches during cleaning and wiping, and cannot meet the wiping resistance requirements required for furniture surfaces.

That is to say, there is no technical report that can satisfy the flame-retardant PET polyester sheet used as furniture surface veneer in the prior art.

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