CN113637149A - Acetyl-oligomeric lactic acid mono-diglycerol fatty acid ester plasticizer and preparation method thereof - Google Patents
Acetyl-oligomeric lactic acid mono-diglycerol fatty acid ester plasticizer and preparation method thereof Download PDFInfo
- Publication number
- CN113637149A CN113637149A CN202111019076.5A CN202111019076A CN113637149A CN 113637149 A CN113637149 A CN 113637149A CN 202111019076 A CN202111019076 A CN 202111019076A CN 113637149 A CN113637149 A CN 113637149A
- Authority
- CN
- China
- Prior art keywords
- mono
- acid ester
- diglycerol
- fatty acid
- reaction
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G63/00—Macromolecular compounds obtained by reactions forming a carboxylic ester link in the main chain of the macromolecule
- C08G63/91—Polymers modified by chemical after-treatment
- C08G63/912—Polymers modified by chemical after-treatment derived from hydroxycarboxylic acids
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C67/00—Preparation of carboxylic acid esters
- C07C67/08—Preparation of carboxylic acid esters by reacting carboxylic acids or symmetrical anhydrides with the hydroxy or O-metal group of organic compounds
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L67/00—Compositions of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Compositions of derivatives of such polymers
- C08L67/04—Polyesters derived from hydroxycarboxylic acids, e.g. lactones
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
- C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
Abstract
The invention discloses an acetyl oligomeric lactic acid mono-diglycerol fatty acid ester plasticizer and a preparation method thereof, belonging to the field of plastic additives. The product is prepared from acetic acid or acetic anhydride, lactic acid, mono/diglycerol fatty acid ester and other raw materials through polycondensation reaction, esterification reaction, refining and other processes. The degree of acylation and the degree of polymerization and the carbon chain distribution of fatty acid are changed to make the solubility parameter of the compound similar to that of PLA and improve the acetylizationThe compatibility of the lactic acid mono-di-fatty glyceride and the PLA is applied to the PLA product, so that the glass transition temperature and the crystallinity of the PLA product are reduced, the elongation at break of the PLA product is improved, the mobility of the PLA product is improved, and the quality and the stability of the PLA product are effectively improved. Which is a mixture containing the following chemical formula,
Description
Technical Field
The invention relates to an acetyl oligomeric lactic acid mono-diglycerol fatty acid ester plasticizer and a preparation method thereof, belonging to the field of plastic additives.
Background
Polylactic acid (PLA) is a biodegradable environment-friendly material synthesized by taking renewable resources such as straws, corns and the like as raw materials, and provides an effective alternative scheme for getting rid of the dependence of fossil energy, but the development and application of the PLA are seriously influenced by the defects of poor PLA, impact resistance, mechanical properties and the like, and the addition of a plasticizer is one of effective solutions.
The currently commonly used environment-friendly plasticizers mainly comprise three types of citrate, epoxidized soybean oil and polyester, wherein the citrate plasticizer is not well compatible with PLA and is seriously separated out at high temperature; poor oxidation resistance of epoxidized soybean oil limits its wide range of applications. The polyester plasticizer has the characteristics of low volatility, high temperature resistance, strong stability, safety and no toxicity, and is more popular than other two types.
Acetylated mono-fatty glyceride and diglyceride belong to one of polyester plasticizers, have been widely applied to products such as PVC and the like, and have better development prospect. However, the compatibility of acetylated mono-and di-fatty acid glycerides with polylactic acid (PLA) resins is not ideal, and modification is required for their better use. The oligomeric lactic acid is embedded into the acetylated mono-fatty acid glyceride and the acetylated di-fatty acid glyceride, so that the solubility parameter of the oligomeric lactic acid is closer to that of PLA, the glass transition temperature and the crystallinity of the oligomeric lactic acid are reduced, and the purposes of improving the compatibility and the elongation at break of the oligomeric lactic acid and the PLA are achieved. At present, no relevant literature report is found.
Disclosure of Invention
In order to improve the compatibility of acetylated mono-diglycerol fatty acid ester in polylactic acid (PLA) resin, the invention aims to provide an acetyl oligomeric lactic acid mono-diglycerol fatty acid ester plasticizer, oligomeric lactic acid is embedded into the acetylated mono-diglycerol fatty acid ester, so that the solubility parameter of the plasticizer is similar to that of PLA, the glass transition temperature and the crystallinity of the plasticizer are reduced, and the purposes of improving the compatibility and the elongation at break of the plasticizer and the PLA are achieved. Another object is to provide a process for the preparation thereof.
To achieve the object of the present invention, the plasticizer of the present invention is a mixture containing the following molecular structures:
n is one or more of the above numerical ranges.
The preparation method of the acetyl oligomeric lactic acid mono-diglycerol fatty acid ester comprises the following steps:
1. putting lactic acid into a reaction kettle, and dehydrating at 70-80 ℃ under a vacuum condition; then adding catalyst A, continuing to raise the temperature to 150-170 ℃, carrying out polycondensation reaction, and stopping the polycondensation reaction when the average polymerization degree reaches 1-3 and the molecular weight reaches between 90 and 234. Specifically, the average molecular weight and the degree of polymerization were calculated from the water yield.
2. Putting the diglycerol fatty acid ester and the polylactic acid into a reaction kettle according to the material proportion, adding a catalyst B, keeping the temperature at 170-180 ℃ under vacuum to carry out esterification reaction, and judging the end point according to the condition that the acid value is less than 2 mgKOH/g; and after the reaction is finished, cooling, decoloring, washing with water, drying and packaging to obtain the product.
3. Glacial acetic acid or acetic anhydride is added into the step II to carry out esterification reaction, excessive acetic acid or acetic anhydride is distilled after the reaction is ended, and the mixture is decolorized, dried and packaged after the acid value is less than 2 mgKOH/g.
The mono-diglycerol fatty acid ester is at least one of mono-diglycerol caprylic acid ester, mono-diglycerol capric acid ester, mono-diglycerol lauric acid ester, mono-diglycerol palmitic acid ester or mono-diglycerol stearic acid ester.
The catalyst A is magnesium oxide or calcium oxide; the catalyst B is sodium hydroxide or potassium hydroxide, tetramethyl guanidine and stannous octoate.
The monoglyceride is a product of glycerin with one hydroxyl group esterified with fatty acid, and also has two free hydroxyl groups (monoglyceride); the diglycerol fatty acid ester is a product of esterification of two hydroxyl groups of glycerin with fatty acid, and also has a free hydroxyl group (diglyceride). The mono/diglycerol fatty acid ester is a mixture of the two.
The invention has the advantages that: by changing the polar group of the mono/diglycerol fatty acid ester and changing the acylation degree, the polymerization degree and the carbon chain distribution of the fatty acid, the solubility parameter of the mono/diglycerol fatty acid ester is more similar to that of PLA, and the compatibility of the acetyl oligomeric lactic acid mono/diglycerol fatty acid ester and PLA is improved. The acetyl oligomeric lactic acid mono-diglycerol fatty acid ester is applied to PLA products, the glass transition temperature and the crystallinity of the products can be reduced, the elongation at break of the products can be improved, the mobility of the products can be improved, the flexibility of the products can be enhanced, the performance of the products can be more stable, and the quality of the products can be effectively improved.
Detailed Description
To better illustrate the invention, the following examples are given:
example 1
512Kg of lactic acid (88 mass percent) is measured, the water is removed at the temperature of 70-80 ℃ under vacuum, 1Kg of magnesium oxide is added, the polycondensation reaction is carried out when the temperature is gradually increased to 150-165 ℃ under vacuum, the water yield is 110Kg, and the reaction is stopped when the acid value is 320-350 mgKOH/g.
450Kg of mono-diglycerol stearate and 400Kg of the polylactic acid prepared above are put into a reaction kettle, 1Kg of sodium hydroxide is added, the temperature is gradually raised to 165-170 ℃ under vacuum, the reaction is kept for 4 hours, the water yield is about 45Kg, and the reaction is stopped when the acid value is less than 2mgKOH/g, and about 800Kg of intermediate is obtained.
Injecting about 300Kg of acetic anhydride into the intermediate in the last step, carrying out reflux reaction at the temperature of 135-140 ℃ for 5-6h, distilling out acetic acid which does not participate in the reaction until the acid value is less than 10mgKOH/g, adding 100Kg of water into the intermediate, washing with water, standing, carrying out layering to bring out residual acetic acid, repeatedly washing with water until the acid value is 1mgKOH/g, and then drying after washing, wherein the product is colorless transparent liquid, the water content is 0.5%, and packaging to obtain the product, namely the acetyl-diglycerol stearate ALGS.
Example 2
Metering 550Kg of lactic acid (the mass percentage content is 88%), removing water at the temperature of 70-80 ℃ under vacuum, then adding 1Kg of magnesium oxide, and continuing to carry out polycondensation reaction when the temperature is gradually increased to 155-165 ℃ under vacuum, wherein the water yield is 140Kg, and the reaction is stopped when the acid value is between 240-260 mgKOH/g.
Putting 270Kg of mono-diglycerol laurate and 480Kg of the polylactic acid prepared above into a reaction kettle, adding 1Kg of sodium titanate, gradually raising the temperature to 175-plus 180 ℃ under vacuum, keeping the temperature and reacting for 4h, wherein the water yield is 35-40Kg, and the reaction is stopped when the acid value is less than 2mgKOH/g, thus obtaining an intermediate.
Injecting about 220Kg of acetic anhydride into the intermediate in the last step, carrying out reflux reaction at the temperature of 135-140 ℃ for 5-6h, distilling out acetic acid which does not participate in the reaction until the acid value is less than 10mgKOH/g, adding 100Kg of water into the intermediate, carrying out water washing to bring out residual acetic acid, repeatedly carrying out water washing until the acid value is 1mgKOH/g, drying after the formula value is less than 5mgKOH/g, and packaging to obtain the acetylated trilauryl acid monoglyceride and diglyceride ALLS product, wherein the water content of the product is 0.5 percent.
Example 3
Metering 550Kg of lactic acid (the mass percentage content is 88%), removing water at the temperature of 70-80 ℃ under vacuum, then adding 1Kg of magnesium oxide, and continuing to carry out polycondensation reaction when the temperature is gradually increased to 155-165 ℃ under vacuum, wherein the water yield is 140Kg, and the reaction is stopped when the acid value is 240-260 mgKOH/g.
210Kg of mono-diglycerol caprylate and 480Kg of the polylactic acid prepared above are put into a reaction kettle, 1Kg of tetramethylguanidine is added, the temperature is gradually raised to 165-170 ℃ under vacuum, the reaction is kept for 4 hours, the water yield is 35-40Kg, and the reaction is stopped when the acid value is less than 2mgKOH/g, thus obtaining the intermediate.
Injecting about 180Kg of glacial acetic acid into the intermediate in the last step, carrying out reflux reaction at the temperature of 135-140 ℃ for 5-6h, distilling out the acetic acid which does not participate in the reaction until the acid value is less than 10mgKOH/g, adding 100Kg of water into the intermediate, carrying out water washing to remove the residual acetic acid, repeatedly carrying out water washing until the acid value is less than 1mgKOH/g, drying after the formula value is less than 5mgKOH/g, and packaging to obtain the acetylated triglycerol caprylate ALMS product, wherein the water content is 0.5 percent.
Example 4
200Kg of lactic acid (88 mass percent) is measured, water is removed at the temperature of 70-80 ℃ under vacuum, 1Kg of magnesium oxide is added, the polycondensation reaction is carried out when the temperature is gradually increased to 155-165 ℃ under vacuum, the water yield is 30-40Kg, and the reaction is stopped when the acid value is 580-620 mgKOH/g.
Then adding 300Kg of a mixture of mono-diglycerol fatty acid esters (wherein the mono-diglycerol caprylate, the mono-diglycerol laurate, the mono-diglycerol palmitate and the mono-diglycerol stearate respectively account for 25%), adding 2.2Kg of stannous octoate, continuously increasing the temperature gradually to 175 ℃ under vacuum, reacting for 8h, wherein the water yield is 30-40Kg, and the reaction is stopped when the acid value is less than 2mgKOH/g, thus obtaining an intermediate.
Injecting about 200Kg of glacial acetic acid into the intermediate in the last step, carrying out reflux reaction at the temperature of 135-140 ℃ for 5-6h, distilling out the acetic acid which does not participate in the reaction until the acid value is less than 10mgKOH/g, adding 100Kg of water into the intermediate, carrying out water washing to obtain residual acetic acid, repeatedly carrying out water washing until the acid value is less than 1mgKOH/g and the formula value is less than 5mgKOH/g, drying to obtain the product, namely colorless transparent liquid with the water content of 0.5%, and packaging to obtain the acetylated trimeric lactic acid monoglyceride and diglyceride fatty acid ester ALMM.
Application example
Respectively adding the four acetyl oligomeric lactic acid mono-and diglycerol fatty acid ester plasticizers (ALGS, ALLS, ALMS and ALMM) prepared in the example into a high-speed mixer according to the proportion of 40 parts, 59 parts of PLA resin, 0.5 part of nucleating agent, 0.2 part of antioxidant and 0.3 part of dispersant, and mixing for 5 min; then sending the mixture into a double-screw machine for extrusion granulation; drying the granules in a 60 ℃ air blast oven for 12h, adding the granules into a single-screw extruder for extrusion blow molding, wherein the temperature of the single screw is 160 ℃ and 170 ℃, the rotating speed is 20-40rpm, and the length-diameter ratio L/D is 25/1. The application properties of the tabletting material are as follows:
experiments show that the acetyl oligomeric lactic acid mono-diglycerol fatty acid ester plasticizer has good plasticizing and modifying effects on PLA, can effectively improve the tensile strength and the elongation at break, and has the best ALLS effect.
Claims (2)
1. An acetyl oligomeric lactic acid mono-diglycerol fatty acid ester plasticizer is characterized in that the plasticizer is a mixture containing the following chemical formula,
n is one or more of the above numerical ranges.
2. A method for preparing an acetylated oligolactic acid mono, diglycerol fatty acid ester plasticizer according to claim 1, comprising the steps of:
putting lactic acid into a reaction kettle, and dehydrating at 70-80 ℃ under a vacuum condition; then adding a catalyst A, and continuously raising the temperature to 150-; stopping the polycondensation reaction when the average polymerization degree reaches 1-3 and the molecular weight reaches between 90 and 234;
putting the mono-diglycerol fatty acid ester and the polylactic acid synthesized in the step (1) into a reaction kettle, adding a catalyst B, keeping the temperature at 170-180 ℃ under vacuum to perform esterification reaction, judging the end point according to the fact that the acid value is less than 2mgKOH/g, and cooling after the reaction is finished;
adding glacial acetic acid or acetic anhydride into the step II to perform esterification reaction, distilling excessive acetic acid or acetic anhydride after the reaction is ended, washing with water until the acid value is less than 2mgKOH/g, decoloring, drying and packaging;
the mono-diglycerol fatty acid ester is at least one of mono-diglycerol caprylic acid ester, mono-diglycerol capric acid ester, mono-diglycerol lauric acid ester, mono-diglycerol palmitic acid ester or mono-diglycerol stearic acid ester;
the catalyst A is magnesium oxide or calcium oxide; the catalyst B is sodium hydroxide or potassium hydroxide, sodium titanate, tetramethyl guanidine or stannous octoate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111019076.5A CN113637149A (en) | 2021-09-01 | 2021-09-01 | Acetyl-oligomeric lactic acid mono-diglycerol fatty acid ester plasticizer and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111019076.5A CN113637149A (en) | 2021-09-01 | 2021-09-01 | Acetyl-oligomeric lactic acid mono-diglycerol fatty acid ester plasticizer and preparation method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113637149A true CN113637149A (en) | 2021-11-12 |
Family
ID=78424799
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111019076.5A Pending CN113637149A (en) | 2021-09-01 | 2021-09-01 | Acetyl-oligomeric lactic acid mono-diglycerol fatty acid ester plasticizer and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113637149A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004315479A (en) * | 2003-04-21 | 2004-11-11 | Riken Vitamin Co Ltd | Nail enamel composition |
| JP2008221813A (en) * | 2007-03-16 | 2008-09-25 | Mitsubishi Plastics Ind Ltd | Multilayered lactic acid-based soft film |
| CN102666697A (en) * | 2009-09-30 | 2012-09-12 | 陶氏环球技术有限责任公司 | Acetylated polyglycerine fatty acid ester and a pvc insulator plasticised therewith |
| CN103242558A (en) * | 2013-05-24 | 2013-08-14 | 河南正通化工有限公司 | Citric ester plasticizer and preparation method thereof |
| CN112940235A (en) * | 2021-02-06 | 2021-06-11 | 河南正通食品科技有限公司 | Polylactic acid plasticizer and preparation method thereof |
-
2021
- 2021-09-01 CN CN202111019076.5A patent/CN113637149A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004315479A (en) * | 2003-04-21 | 2004-11-11 | Riken Vitamin Co Ltd | Nail enamel composition |
| JP2008221813A (en) * | 2007-03-16 | 2008-09-25 | Mitsubishi Plastics Ind Ltd | Multilayered lactic acid-based soft film |
| CN102666697A (en) * | 2009-09-30 | 2012-09-12 | 陶氏环球技术有限责任公司 | Acetylated polyglycerine fatty acid ester and a pvc insulator plasticised therewith |
| CN103242558A (en) * | 2013-05-24 | 2013-08-14 | 河南正通化工有限公司 | Citric ester plasticizer and preparation method thereof |
| CN112940235A (en) * | 2021-02-06 | 2021-06-11 | 河南正通食品科技有限公司 | Polylactic acid plasticizer and preparation method thereof |
Non-Patent Citations (1)
| Title |
|---|
| 胡云等: "增塑剂乙酰聚合甘油不饱和脂肪酸多酯的合成及应用", 《高分子材料科学与工程》 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105623214B (en) | One kind plasticising Biodegradable polyester film and preparation method thereof | |
| CN104861210B (en) | A kind of starch base full biodegradable resin of hydrophobic stabilization and preparation method thereof | |
| CN111546740B (en) | Biodegradable paper-plastic composite structure and preparation method thereof | |
| CN111116997A (en) | Biodegradable pipe and preparation method and application thereof | |
| KR100394410B1 (en) | Process for producing starch ester, starch ester, and starch ester composition | |
| KR20150134355A (en) | Water-soluble polymer and polymer internal lubricant | |
| CN111978691B (en) | Biodegradable mulching film and preparation method thereof | |
| CN111138721A (en) | Biodegradable film, preparation method and application thereof | |
| CN113956630A (en) | Completely biodegradable film and preparation method thereof | |
| KR20080065619A (en) | Water-soluble biodegradable material | |
| CN113637149A (en) | Acetyl-oligomeric lactic acid mono-diglycerol fatty acid ester plasticizer and preparation method thereof | |
| CN115490926B (en) | High-transparency cellulose acetate film capable of being processed at low temperature and preparation method thereof | |
| CN112795149A (en) | Biodegradable polyester PBAT composite material and preparation method thereof | |
| CN112940235B (en) | Polylactic acid plasticizer and preparation method thereof | |
| CN103380237A (en) | Degradable fibers | |
| JP3620265B2 (en) | Method for producing lactic acid copolymer | |
| CN111218075A (en) | Medium-temperature water-soluble PVA composition for blow molding film, particles thereof and preparation method thereof | |
| CN107641107B (en) | Diacetyl epoxy glyceryl undecanoate and preparation method and application thereof | |
| CN113603876B (en) | Polyglycolic acid (PGA) plasticizer and preparation method thereof | |
| CN113264835B (en) | Lactoyl citrate plasticizer and preparation method thereof | |
| EP3689955B1 (en) | Improved starch based biodegradable polymers | |
| CN113881111A (en) | Thermoplastic corn starch for plastic filling and preparation method thereof | |
| JPH11209482A (en) | Biodegradable film and sheet | |
| JPH07304897A (en) | Thermoplastic chemically modified lignocellulose composition and its production | |
| KR20140074757A (en) | The thermoplastic cellulose derivative composition and thereby made fiber and manufacturing method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |