Unlock instant, AI-driven research and patent intelligence for your innovation.

A kind of preparation method and application of lactic acid-based environment-friendly plasticizer

An environment-friendly plasticizer and lactic acid-based technology, applied in the field of preparation of lactic acid-based environment-friendly plasticizers, can solve problems such as difficult degradation and environmental pollution, and achieve easy biodegradation, good migration resistance, and good plasticizing performance. Effect

Active Publication Date: 2019-03-19
JIANGNAN UNIV
View PDF5 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, it is difficult to degrade PVC products plasticized by traditional plasticizers, causing environmental pollution

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A kind of preparation method and application of lactic acid-based environment-friendly plasticizer
  • A kind of preparation method and application of lactic acid-based environment-friendly plasticizer
  • A kind of preparation method and application of lactic acid-based environment-friendly plasticizer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Example 1 Preparation of acetylated 2-ethylhexyl lactate (ALEH)

[0022] The reaction scheme is as follows:

[0023]

[0024] Add 40.54g (0.45mol) lactic acid, 39.07g (0.30mol) 2-ethylhexanol (acid-alcohol molar ratio is 1.5), catalyst 1.15g (0.0075mol) p-toluenesulfonic acid (reactant mole 1%) and 12mL cyclohexane as the water-carrying agent (12% of the mass of the reactant), set the temperature of the oil bath to 130°C, heat and reflux to divide the water until the acid value no longer decreases, which is the end of the reaction; -0.1MPa vacuum distillation Cyclohexane and remaining 2-ethylhexanol are removed and recycled to obtain 2-ethylhexyl (oligo)lactate. Then add 33.69g (0.33mol) acetic anhydride (excess 10%), control the rate of addition of acetic anhydride to control the reaction temperature at 70±2°C, continue stirring for 6-8h, the reaction ends when the system temperature is close to room temperature, after separation and purification Acetylated (oligo...

Embodiment 2

[0026] Example 2 Preparation of acetylated 2-propylheptyl lactate (ALPH)

[0027] The reaction scheme is as follows:

[0028]

[0029] Add 27.02g (0.30mol) lactic acid, 31.66g (0.20mol) 2-propylheptanol (acid-alcohol molar ratio is 1.5), catalyst 0.72g (0.005mol) p-toluenesulfonic acid (reactant mole 1%) and 9mL cyclohexane as the water-carrying agent (12% of the mass of the reactant), set the temperature of the oil bath to 130°C, heat and reflux to divide the water until the acid value no longer decreases, which is the end of the reaction; -0.1MPa vacuum distillation Cyclohexane and remaining 2-propylheptanol were removed and recycled to obtain (oligomeric) 2-propylheptyl lactate. Then add 22.46g (0.22mol) of acetic anhydride (excess 10%), control the rate of addition of acetic anhydride to control the reaction temperature at 70±2°C, continue stirring for 6h-8h, the reaction ends when the system temperature is close to room temperature, after separation and purification ...

Embodiment 3

[0031] Add 36.03g (0.40mol) lactic acid, 31.66g (0.20mol) decanol (acid-alcohol molar ratio is 2.0), catalyst 0.57g (0.003mol) p-toluenesulfonic acid (0.5% of the molar amount of the reactant) into the reactor and 10mL cyclohexane as the water-carrying agent (12% of the mass of the reactant), set the temperature of the oil bath to 130°C, heat and reflux to separate the water until the acid value no longer decreases, which is the end of the reaction;

[0032] -0.1MPa vacuum distillation to remove cyclohexane and the remaining decanol and recycle them to obtain (oligomeric) decyl lactate. Then add 22.46g (0.22mol) of acetic anhydride (excess 10%), control the rate of addition of acetic anhydride to control the reaction temperature at 70±2°C and continue to stir for 6h-8h. When the system temperature is close to room temperature, the reaction ends. After separation and purification, Acetylated (oligo)decyl lactate.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention relates to a preparation method and an application of a lactic acid-based environment-friendly plasticizer, and belongs to the fields of synthesis of refined chemical products and application of plastic additives. The preparation method comprises the following steps of using lactic acid, polyhydric alcohols and acetic anhydride as main raw materials, performing two-step reaction of etherification and acetylation, and obtaining a crude environment-friendly plasticizer; removing a water-carrying agent and alcohols from the crude product, and separating, so as to obtain the purified lactic ester, wherein the molecular structure of the lactic ester is oligoester with branched chains. The preparation method has the advantage that by utilizing the function structure with hydroxyl and carboxyl in lactic acid molecules, the molecule modification and the structural function agglomeration are performed, so that the prepared environment-friendly plasticizer has the characteristics of low viscosity, light color, no benzene ring structure, low toxicity, environment-friendly effect, easy biodegradation, good compatibility with PVC (polyvinyl chloride), and organic solvent transfer-resistant property, and is suitable for industrial production. The prepared lactic acid-based environment-friendly plasticizer is expected to replace the traditional phthalic acid plasticizer.

Description

technical field [0001] The invention relates to a preparation method and application of a lactic acid-based environment-friendly plasticizer, and belongs to the technical field of synthesis of fine chemicals and application of plastic additives. Background technique [0002] With the application of PVC resin products in food, medicine and other industries more and more widely, people have higher and higher environmental protection requirements for additives, such as plasticizer products, which are the most used in PVC products. The toxicity of traditional phthalic acid-based PVC plasticizers has attracted more and more attention due to the presence of phthalic structures in their molecules. The European Union has restricted the use of various phthalic acid-based plasticizers from children's toys, food Packaging has expanded to the fields of electronic appliances such as medical equipment and monitoring and control instruments. In addition, it is difficult to degrade PVC pro...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C07C67/31C07C69/675C08G63/08C08L27/06C08L67/04C08K5/101
CPCC07C67/08C07C67/31C08G63/08C08K5/101C08L27/06C07C69/675C08L67/04
Inventor 蒋平平刘涛刘洪亮李梦天
Owner JIANGNAN UNIV