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Method for preparing castor oil plasticizing polylactic acid type polyurethane

A technology of castor oil and polylactic acid, which is applied in the field of castor oil-toughened polylactic acid polyurethane, can solve the problems of high cost, complex process, and difficulty in industrial realization, and achieve the effects of low cost, simple operation method, and simple equipment

Inactive Publication Date: 2008-08-13
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, there are many studies at home and abroad that have modified polylactic acid, such as 1) application date 2005.4.30, application number 200510016771.0, authorization announcement date 2007.8.8, patent number ZL200510016771.0 Chinese patent application document "surface lactic acid graft modification "Preparation method of graft copolymer of non-toxic starch and aliphatic polyester" adopts ring-opening copolymerization synthesis method to obtain a compound with excellent plasticity and processability, but the process is complicated and the cost is high; 2) Application date 2005.11.10 , the Chinese patent document "A Preparation Method of Ramie Fiber Reinforced Polylactic Acid Composite Material" with application number 200510110181.4. The composite material prepared by using higher molecular weight polylactic acid has excellent interfacial properties, but it fails to improve the mechanical properties of the material ; 3) Application date 2005.12.28, application number 200510119120.4 Chinese patent application document "preparation method of fully biodegradable high-toughness polylactic acid material" carries out cross-linking under electron beam irradiation to the formed polylactic acid material to obtain a relatively Polylactic acid material with high toughness, but this kind of method has high cost and is not easy to realize industrially

Method used

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Experimental program
Comparison scheme
Effect test

specific Embodiment 1

[0013] a. Add 112 grams of L lactic acid (88% aqueous solution) and 0.25 grams of 1,4-butanediol into a 250mL four-neck flask, first stir and dehydrate at 130-150°C under normal pressure for 1-2 hours, and then reduce Press to -0.08~-0.09MPa for dehydration reaction for 1~2 hours, and react at -0.1MPa for 5~10 hours to obtain oligomers, about 70 grams; then 0.35 grams of stannous chloride dihydrate, 0.28 grams Add p-toluenesulfonic acid to the reaction system, then react at 160-190°C and -0.1MPa for 5-15 hours to obtain polyester diol.

[0014] b. Weigh 10 grams of the above-synthesized polyester diol and 2 times (moles) of castor oil into a 250mL four-necked bottle, first vacuum dry at 110-120°C for 1-2 hours, and then add 100mL of toluene was used to completely dissolve the reactant, then argon gas was introduced under stirring and the temperature was raised to 60-105°C, and then the chain extender hexamethylene diisocyanate (-NCO / -OH=1.1) was added, and the reaction was sti...

specific Embodiment 2

[0015] Specific embodiment 2: the difference between this embodiment and specific embodiment 1 is that the content of castor oil is 1 times of polyester diol, and other synthetic steps and processing conditions are identical with specific embodiment 1, and finally obtaining tensile strength is 0.42 ~0.77MPa, elastic modulus of 10.1~18.6MPa, elongation at break of 6.5~32.2% castor oil toughened polylactic acid polyurethane.

specific Embodiment 3

[0016] Specific embodiment 3: the difference between the present embodiment and specific embodiment 1 is that the content of 1,4-butanediol is 0.5% of lactic acid during prepolymerization, and other synthetic steps and process conditions are the same as specific embodiment 1, finally obtain The tensile strength is 18.3-35.2MPa, the elastic modulus is 652-1235MPa, and the elongation at break is 3.74-8.62%. The castor oil toughened polylactic acid polyurethane.

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Abstract

The invention provides a castor oil toughened polyurethane of polylactide type and preparation thereof. Firstly, polycondensation is directly carried out by L lactci acid and 4-butanediol to prepare prepolymer of hydroxyl-terminated lactic acid, hexamethylene diisocyanate is used as chain extender, then chain extension in solution and polymerization are carried out by castor oil to obtain polyurethane of polylactide type. The invention uses green material prepared form absolute natural raw material, keeps biodegradability of polyurethane, modifies weak mechanical property of polyurethane by copolymerizaiton of castor oil and polyurethane. The obtained polyurethane of polylactide type not only keeps degradability of polyurethane, but also increases toughness and elongation at break of castor oil.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and in particular relates to a method for producing castor oil toughened polylactic acid polyurethane. Background technique [0002] With the increasingly tense contradiction between the supply and demand of petroleum energy, the price of oil has risen sharply. Various plastic products derived from petroleum production are difficult to degrade after being discarded, which seriously pollutes the deteriorating ecological environment and directly threatens the survival, health and development of human beings; It is the general trend and the future development direction of the plastics industry to replace it with degradable "bioplastics" (that is, eco-friendly plastics). [0003] As a typical representative of natural materials, polylactic acid (PLA), which is polymerized from biosynthesized lactic acid, consumes only 20%-50% of the energy consumed by traditional petrochemical products, and...

Claims

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Application Information

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IPC IPC(8): C08G18/67C08G18/66C08G18/08
Inventor 杨光余龙江付标
Owner HUAZHONG UNIV OF SCI & TECH
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