High-transparency high-temperature-resistance polylactic acid composite material and preparation method thereof

Abstract

The invention relates to a high-transparency high-temperature-resistance polylactic acid composite material and a preparation method thereof, belonging to the technical field of high-polymer materials. The polylactic acid composite material is prepared from the following raw materials in percentage by mass: 85-99% of polylactic acid, 0.1-10% of toughener, 0.1-2% of crystallization nucleator, 0.1-2% of hydrolysis-resistant stabilizer and 0.1-1% of lubricant. The method improves the flexibility of the polylactic acid, further enhances the transparency and temperature resistance of the polylactic acid, and improves the hydrolytic stability of the polylactic acid. Compared with the pure polylactic acid, the composite material has the advantages of favorable transparency (the light transmittance is at least 90%), low fog degree (at most 3.5), high temperature resistance, high heat-deformation temperature (at least 100 DEG C), favorable toughness and high mechanical strength, and can substitute the conventional plastics for use. The preparation method is simple and easy to implement.

Description

technical field [0001] The invention relates to a highly transparent and high temperature-resistant polylactic acid composite material and a preparation method thereof, belonging to the technical field of polymer materials. Background technique [0002] The increasing "white pollution" problem has aroused people's reflection. Due to the non-degradable nature of plastics, it has caused great harm to the environment. We can't drive plastic out of our lives, after all, it brings a lot of convenience to life, but we can find environmentally friendly materials to replace plastics. Aliphatic polyester materials have good biodegradability and help to solve the problem of "white pollution" caused by traditional plastics. At present, the aliphatic polyester materials that have been industrialized mainly include polylactic acid, polybutylene succinate, polycaprolactone, etc. Among them, polylactic acid has the largest production capacity, the earliest industrialization, and the most ...

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Problems solved by technology

[0004] CN101503565A discloses a composite material of polylactic acid / nanometer silicon dioxide / citrate, although it has improved the toughness and thermal decomposition temperature of polylactic acid by plasticizing, its transparency has been affected, and the light transmittance is only 85%. ~89%, haze 3.8~4.7%, no improvement in temperature resistance

[0005] CN101993584A discloses a composite material of polylactic acid / aliphatic polyester / epoxy-containing acrylate polymer, which utilizes other aliphatic polyesters to toughen polylactic acid, and introduces a compatibilizer, but makes the transparency large Discounted, the highest light transmittance is only 80%, and the temperature resistance has not been improved

[0006] CN101914274A and CN101983986A respectively disclose polylactic acid / poly 1,2-propylene glycol adipate, polylactic acid / methyl methacrylate-butyl acrylate copolymer / citrate composite materials, they also only improve toughness, do not involve resistance Improvement of temperature, the former has a light transmittance of 87-90%, but the haze is very high, with a haze of 7.7-9.9%, and the latter has a light transmittance of 89%, and a haze of 8.5%.

[0007] CN102898798A and CN104109363A respectively disclose polylactic acid / elastomer containing maleic anhydride or epoxy group, left-handed polylactic acid / dextral polylactic acid / epoxy base compatibilizer composite material, but only improve the flexibility of polylactic acid, transparent The light transmittance of the former is also affected, the light transmittance of the former is up to 87%, and the light transmittance of the latter is up to 76%, and there is no improvement in temperature resistance

[0008] CN102086299A discloses a polylactic acid / 0.1-5% crystal nucleating agent / 0.5-20% plasticizer composite material, the crystal nucleating agent is sorbitol and its derivatives, organic phosphoric acid, talcum powder, ethylene bis-1, 2-Hydroxystearamide or dehydroabietic acid amide compound, the crystallization time is too long, the half-crystallization time is ≥1.34min, the transparency is poor, the light transmittance is only 63.7-84.7%, the temperature resistance is low, the temperature resistance is <100℃, only 62~98℃

[0009] CN102206406A discloses a polylactic acid / chitin whisker polymethyl methacrylate coating / chain extender / oligomer polylactic acid composite material. Although the toughness of polylactic acid is significantly improved, the transparency is poor, and the light transmittance is low. Only 89.2%, temperature resistance 102.7 ℃, and the coating process of chitin whiskers is very complicated, it is difficult to achieve large-scale production

In addition, the prior art does not involve improving the temperature resistance of polylactic acid and the improvement of properties such as stability against hydrolysis.

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