CN102875778A

CN102875778A - Method for preparing degradable material

Info

Publication number: CN102875778A
Application number: CN2012101157434A
Authority: CN
Inventors: 周国亮; 赵诣
Original assignee: Shanghai Qibao High School
Current assignee: Shanghai Qibao High School
Priority date: 2012-04-18
Filing date: 2012-04-18
Publication date: 2013-01-16

Abstract

The invention provides a method for preparing a good degradable material, namely L-polylactic acid. The degradable material, namely the L-polylactic acid, which is prepared by the method is not limited to degradation conditions and can be widely applied in the industry.

Description

The method for preparing a kind of degradation material

Technical field

The invention belongs to degradation material, relate in particular to a kind of method of degradable poly lactic acid degradable material.

Background technology

Plastics are being played the part of important role in daily life.Plastics have light weight, waterproof, durable, low cost and other advantages as a kind of type material, since coming out, just have been widely used in the fields such as industry, agricultural, fishery, deeply are subjected to people's welcome.

But plastics also exist huge hidden danger in the widely used while.The most stable performance of plastics is difficult to be utilized, decompose by microorganism in physical environment.It is reported, though the polyolefins material in soil 100 years can not be degradable.Plastic packing product causes waste or used plastics to remain in a large number in the physical environment owing to do not pay attention to picking up, reclaiming use, has a strong impact on daily life.The processing problem of Plastics Packaging Wastes has become the focus that present countries in the world are paid close attention at present.

The exploitation degradation material can reduce the use of conventional plastic, solves owing to excessive use plastics are given physical environment, human society adverse effect, and therefore, degradation material has been done a large amount of research at present.In the prior art, degradable plastics roughly can divide: photodegradable plastics, biodegradable plastic, light/biodegradation plastic and other degradative plasticss.In practical application area mainly take photodegradation type and Biodegradable plastic as main.

The development comparative maturity of photodegradable plastics technology, but because himself to be only applicable to the sunshine duration long, the area use of quantity of illumination abundance, range of application is narrow; On the other hand, the main component of photodegradable plastics is polyolefin resin, and its degradable property is subject to people's suspection, and a small amount of photosensitizers is heavy metal substance, does not also meet environmental requirement.

Only easily degraded under degradable condition of biodegradable plastic.This more general plastics use range of use range that determines it is little, and storage condition requires to require harsher with respect to general plastics.

Summary of the invention

For this reason, technical problem to be solved by this invention provides a kind of preparation method of good degradation material L poly(lactic acid), overcomes the deficiency that prior art exists.

For solving the problems of the technologies described above, the present invention adopts following technical scheme:

The preparation method of degradable PLLA provided by the invention comprises the steps:

(1) substrate lactic acid is heated to 150 ℃;

(2) with the magnetic stirring apparatus 2h that under normal pressure, dewaters;

(3) add L-Phe with the lactic acid equimolar ratio, in the situation that catalyzer tin protochloride/p-methyl benzenesulfonic acid exists, under 180 ℃ of temperature, and at vacuum condition at reaction 12h.

In the preferred embodiments of the present invention, the content of described catalyzer tin protochloride/p-methyl benzenesulfonic acid: 1.5% mol ratio: 1:1.

Adopt technique scheme, PLLA of the present invention has preferably degradation property, can overcome the problem that prior art exists.

Description of drawings

Fig. 1 is poly(lactic acid) synthetic line figure.

Embodiment

In conjunction with shown in Figure 1; 1. get a certain amount of lactic acid (1.3g/L) in three-necked bottle, be heated to 150 ℃.With the 2h that dewaters of normal pressure under the magnetic stirrer.

2. with the vacuum drying oven vacuum-drying 4h that dewaters, obtain lactic acid prepolymer (1.2g/L).

3. add L-Phe (with lactic acid mol ratio 1:1), add catalyzer tin protochloride/p-methyl benzenesulfonic acid (content: 1.5% mol ratio: 1:1) at 180 ℃ of lower vacuum reaction 12h that continue, synthetic PLLA.

Can find out that by detailed introduction of the present invention the PLLA for preparing by the inventive method has good degradation property, is widely used in industry.

But, those of ordinary skill in the art will be appreciated that, above embodiment illustrates the present invention, and be not to be used as limitation of the invention, as long as in connotation scope of the present invention, all will drop in claims scope of the present invention variation, the modification of the above embodiment.

Claims

1. the preparation method of a degradation material, it comprises the following steps:

A. substrate lactic acid is heated to 150 ℃;

B. with the magnetic stirring apparatus 2h that under normal pressure, dewaters;

C. add the L-Phe with the lactic acid equimolar ratio, in the situation that catalyzer tin protochloride/p-methyl benzenesulfonic acid exists, under 180 ℃ of temperature, and at vacuum condition at reaction 12h.

2. method according to claim 1 is characterized in that: the content of described catalyzer tin protochloride/p-methyl benzenesulfonic acid: 1.5% mol ratio: 1: 1.