Fire retardant used for polylactic acid, antiflaming polylactic acid material and preparation method of fire retardant

A polylactic acid material and polylactic acid technology, applied in the field of polymer materials, can solve problems such as poor compatibility, flammability and heat resistance, and reduction of physical and mechanical properties of polylactic acid materials

Active Publication Date: 2019-04-16
湖北玺悦新材料技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, its shortcoming of being extremely flammable and poor in heat resistance limits its further application, so research on the preparation of heat-resistant and flame-retardant polylactic acid materials came into being.
At present, the heat-resistant and flame-retardant performance is mainly improved by adding various intumescent flame retardants and various nucleating agents to polylactic acid resin, but the traditional intumescent flame retardants and nucleating agents are poorly compatible with polylactic acid, which reduces the polylactic acid. Physical and Mechanical Properties of Lactic Acid Materials

Method used

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  • Fire retardant used for polylactic acid, antiflaming polylactic acid material and preparation method of fire retardant
  • Fire retardant used for polylactic acid, antiflaming polylactic acid material and preparation method of fire retardant
  • Fire retardant used for polylactic acid, antiflaming polylactic acid material and preparation method of fire retardant

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preparation example Construction

[0021] A method for preparing a flame retardant for polylactic acid according to an embodiment of the present invention includes the following steps S1-S2:

[0022] S1. Provide modified lignin. The preparation method of modified lignin includes the following steps: mixing lignin, lactic acid and biomass charcoal sulfonic acid and extruding to obtain modified lignin.

[0023] S2. Mix the first reactant with phosphoric acid and modified lignin, heat up to 90-110°C to react until bubbles are generated, and then react at 220-240°C for 1-3 hours to obtain a flame retardant for polylactic acid. One reactant is urea and / or melamine.

[0024] In this example, lactic acid is used to modify lignin under the catalysis of biomass charcoal sulfonic acid to obtain modified lignin, and then react the modified lignin with phosphoric acid, urea or melamine to generate a flame retardant for polylactic acid , the specific reaction principle is as follows Figure 1~2 shown. Since the flame reta...

Embodiment 1

[0035] Mix 100 parts by mass of acid lignin, 25 parts by mass of lactic acid and 0.5 part by mass of biomass charcoal sulfonic acid in a high mixer to obtain a precursor. The precursor is reactively extruded through a twin-screw extruder to obtain modified lignin. The extrusion temperature is 85°C, 95°C, 105°C, 115°C, 115°C, 115°C, and 115°C in sequence from the feeding section to the machine head. , screw speed 15rpm.

[0036] Add 10 parts by mass of urea, 10 parts by mass of phosphoric acid and 6 parts by mass of modified lignin into the reactor, heat up to 100°C at a rate of 20°C / min while stirring, and then continue stirring until the reaction system A large number of bubbles were generated to obtain a prepolymer. Pour the prepolymer into a porcelain container, place it in a constant temperature furnace at 230°C and continue to react for 2 hours to obtain a flame retardant for polylactic acid.

[0037] 100 parts by mass of polylactic acid and 20 parts by mass of a flame ...

Embodiment 2

[0039] Mix 100 parts by mass of acid lignin, 25 parts by mass of lactic acid and 0.5 part by mass of biomass charcoal sulfonic acid in a high mixer to obtain a precursor. The precursor is reactively extruded through a twin-screw extruder to obtain modified lignin. The extrusion temperature is 85°C, 95°C, 105°C, 115°C, 115°C, 115°C, and 115°C in sequence from the feeding section to the machine head. , screw speed 15rpm.

[0040]Add 10 parts by mass of melamine, 10 parts by mass of phosphoric acid and 6 parts by mass of modified lignin into the reactor, heat up to 110°C at a rate of 20°C / min while stirring, and then continue stirring until the reaction system A large number of bubbles were generated to obtain a prepolymer. Pour the prepolymer into a porcelain container, place it in a constant temperature furnace at 230°C and continue to react for 3 hours to obtain a flame retardant for polylactic acid.

[0041] 100 parts by mass of polylactic acid and 20 parts by mass of a fla...

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Abstract

The invention relates to a fire retardant used for polylactic acid, an antiflaming polylactic acid material and a preparation method of the fire retardant. The preparation method mainly comprises thesteps that modified lignin is provided, a preparation method for the modified lignin comprises the following steps that lignin, lactic acid and biomass carbon sulfonic acid are mixed and extruded forforming, and the modified lignin is obtained; a first reaction product is mixed with phosphoric acid and the modified lignin, the temperature rises to 90-110 DEG C, the reaction is conducted until bubbles are generated, the reaction is conducted for 1-3 hours at the temperature of 220-240 DEG C, the fire retardant used for the polylactic acid is obtained, and the first reaction product is urea and / or melamine. The fire retardant used for the polylactic acid contains the structure similar to polylactic acid molecules, so that the fire retardant is compatible to the polylactic acid well, the fire retardant also contains lignin structures with excellent charcoal forming performance, the antiflaming effect of the fire retardant is better, meanwhile, the polylactic acid has the antiflaming performance, and the mechanical intensity of the polylactic acid cannot be influenced.

Description

technical field [0001] The invention relates to the field of polymer materials, in particular to a flame retardant for polylactic acid, a flame retardant polylactic acid material and a preparation method thereof. Background technique [0002] Polylactic acid is a polymer obtained by polymerizing lactic acid as the main raw material. The raw material source is sufficient and can be regenerated. The production process of polylactic acid is non-polluting, and the product can be biodegraded to realize the cycle in nature, so it is an ideal green polymer material. Polylactic acid has a wide range of uses and can be used as packaging materials, fibers and nonwovens, etc. It is mainly used in clothing, construction, agriculture, forestry, papermaking and medical and health fields. However, its shortcomings of extremely flammable and poor heat resistance limit its further application, so the research on the preparation of heat-resistant and flame-retardant polylactic acid materials...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08H7/00C08L67/04C08L97/00
CPCC08H6/00C08L67/04C08L2201/02C08L97/005
Inventor 舒友胡扬剑陈迪钊欧阳跃军张再兴罗琼林许倩
Owner 湖北玺悦新材料技术有限公司
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