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

Method for preparing full-degradable lactic acid composite material from secondary fibers of waste newspaper

A technology for recycling fibers and waste newspapers, which is applied in the field of processing plant fiber reinforced plastic composite materials, and can solve problems such as poor compatibility, poor hydrophilicity, and poor adhesion

Inactive Publication Date: 2011-02-02
李新功
View PDF1 Cites 9 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the waste newspaper recycled fiber contains a lot of polar groups such as hydroxyl groups, it has strong water absorption and polarity.
However, polylactic acid contains a large number of ester bonds, has poor hydrophilicity, and is non-polar, resulting in poor interface compatibility between waste newspaper recycled fibers and polylactic acid plastics. It is a heterogeneous system microscopically, and there is a very clear interface between the two phases. Poor strength
When the composite material prepared from waste newspaper recycled fiber and polylactic acid is subjected to external stress, the stress on the polylactic acid plastic is not easily transmitted to the waste newspaper recycled fiber, resulting in the gradual expansion of the defects between the waste newspaper recycled fiber and the polylactic acid plastic. , the recycled fiber of waste newspapers is easy to separate from the composite material, absorbing moisture and causing the composite material to expand, thereby reducing the mechanical properties and dimensional stability of the composite material

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
  • Method for preparing full-degradable lactic acid composite material from secondary fibers of waste newspaper
  • Method for preparing full-degradable lactic acid composite material from secondary fibers of waste newspaper

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] 1. Soak waste newspapers in tap water for 8 hours, then send them to a strong mixer for beating treatment, and then squeeze out most of the water to obtain recycled wet fibers. Add the wet fiber into 1% NaOH aqueous solution for deinking treatment for 30 minutes, filter and wash until neutral, and then dry the wet fiber through an airflow dryer to a moisture content of about 5%.

[0022] 2. Add MDI solution to the dried recycled fiber for 30 minutes to make modified fiber. The amount of MDI is 1% of the recycled fiber after drying. Then, send the modified fiber into a vacuum drying oven at a temperature of 70°C Dry until the moisture content is about 5%.

[0023] 3. Put the polylactic acid into an oven and dry it at 70°C for 8 hours, then send it to a double-roller rubber mixer and mix it with the dried modified fiber for 10 minutes (the mass ratio of polylactic acid to fiber is 50:50), and make it into a sheet The mixture, the mixing temperature is 150°C, after the fl...

Embodiment 2

[0026] 1. Soak waste newspapers in tap water for 8 hours, then send them to a strong mixer for beating treatment, and then squeeze out most of the water to obtain recycled wet fibers. Add the wet fiber to 1% NaOH aqueous solution for deinking treatment for 30 minutes, filter and wash until neutral, and then dry the wet fiber through an airflow dryer to a moisture content of about 5%.

[0027] 2. Add MDI solution to the dried recycled fiber for 30 minutes to make modified fiber. The amount of MDI is 1% of the dried recycled fiber. Then, the modified fiber is sent into a vacuum drying oven and dried at a temperature of 70°C until the moisture content is about 5%.

[0028] 3. Put the polylactic acid into an oven and dry it at 70°C for 8 hours, then send it to a double-roller rubber mixer and mix it with the dried modified fiber for 10 minutes (the mass ratio of polylactic acid to fiber is 60:40), and make it into a sheet The mixture, the mixing temperature is 150°C, after the fl...

Embodiment 3

[0032] 1. Soak waste newspapers in tap water for 8 hours, then send them to a strong mixer for beating treatment, and then squeeze out most of the water to obtain recycled wet fibers. Add the wet fiber into 1% NaOH aqueous solution for deinking treatment for 30 minutes, filter and wash until neutral, and then dry the wet fiber through an airflow dryer to a moisture content of about 5%.

[0033] 2. Add MDI solution to the dried recycled fibers for modification treatment for 30 minutes to make modified fibers. The amount of MDI is 1% of the dried recycled fibers. Then, the modified fiber is sent into a vacuum drying oven and dried at a temperature of 70°C until the moisture content is about 5%.

[0034] 3. Put the polylactic acid into an oven and dry it at 70°C for 8 hours, then send it to a double-roller rubber mixer and mix it with the dried modified fiber for 10 minutes (the mass ratio of polylactic acid to fiber is 60:40), and make it into a sheet Mixture, kneading temperat...

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 discloses a method for preparing a full-degradable lactic acid composite material from secondary fibers of waste newspaper, which comprises the following steps of: extracting the secondary fibers from the waste newspaper; modifying the secondary fibers; and preparing the full-degradable lactic acid composite material from the modified secondary fibers. The material prepared by the method has good mechanical, thermal and weather-resistant properties, can be fully biodegradable after being abandoned, cannot pollute the ecological environment, and is a green composite material.

Description

technical field [0001] The invention relates to a processing method of a plant fiber reinforced plastic composite material, in particular to a processing method of a fully degradable polylactic acid composite material reinforced with recycled fibers from waste newspapers. Background technique [0002] There will be a lot of waste newspapers in daily life, if not recycled properly, it will pollute our living environment. The main component of newspaper is plant fiber, which has excellent properties such as high strength and high modulus. Polylactic acid is a fully degradable plastic with excellent performance and good processing performance. Recycling waste newspapers, beating, deinking, drying and other processes, and compounding them with polylactic acid and other degradable plastics to prepare composite materials that can be used in automotive interior parts, electrical casings, etc. is a new way of high-grade recycling waste newspapers . The composite material processe...

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
IPC IPC(8): C08L67/04B29C45/76C08L97/02B29C35/00
Inventor 李新功吴义强郑霞李辉程芳童茁
Owner 李新功