Low-odor low-density PLA as well as preparation method and application thereof

Abstract

The invention relates to the field of PLA, in particular to low-odor low-density PLA as well as a preparation method and application thereof. The PLA particle material comprises the following substances in parts by weight: powder obtained by milling a molecular sieve is added into a formula according to 2-10% of a PLA particle raw material; the controllable high-temperature expansion microspheres are added into the formula according to 2-10% of the PLA particle raw material; the balance is a PLA particle raw material. The method has the beneficial effects that the density of a PLA product can be reduced while the odor of the material is reduced, so that the use cost of the PLA product is reduced.

Description

Technical Field

[0001] The invention relates to the field of PLA, in particular to low-odor and low-density PLA and a preparation method and application thereof. Background Art

[0002] PLA is a biodegradable plastic and a low-carbon, environmentally friendly material. However, in its promotion and application, compared with traditional plastics PP and PE materials, on the one hand, it has a stronger odor, which reduces the user experience of the product; on the other hand, the material density and price are relatively high, and the material cost of the finished products is relatively high.

[0003] On December 17, 2024, a search was conducted in the Chinese Patent Publication Database with "PLA and odor and adsorption and molecular sieve and density" as abstract keywords, and the option of allowing synonym expansion was checked, but no relevant literature was found.

[0004] On December 17, 2024, a search was conducted on the website of the United States Patent and Trademark Office for "PLA with odor with adsorption with molecular sievewith density", and no relevant literature was found; the search URL was https: / / ppubs.uspto.gov / pubwebapp / .

[0005] On December 17, 2024, a search was conducted on the Korean Patent Office for "PLA and odor and adsorption and molecular sieve and density", and no relevant literature was found; the search URL was http: / / eng.kipris.or.kr / enghome / main.jsp.

[0006] On December 17, 2024, a search was conducted on WIPO's https: / / patentscope2.wipo.int / for "PLA and odor and adsorption and molecular sieve and density", and no relevant literature was found.

[0007] On December 17, 2024, a search was conducted on the Japan Patent Office website https: / / www.j-platpat.inpit.go.jp / for "PLA and odor and adsorption and molecular sieve and density", but no relevant literature was found.

[0008] Completely different from the concept of this patent. Summary of the invention

[0009] Purpose of the invention: To provide a low-odor, low-density PLA with better effect and a preparation method and use thereof. For specific purposes, see the multiple substantial technical effects in the specific implementation section.

[0010] In order to achieve the above purpose, the present invention adopts the following technical solutions: The low-odor and low-density PLA is characterized in that it contains the following weight components: the powder after the molecular sieve is ground is added to the formula according to 2-10% of the PLA particle raw material; the controllable high-temperature expansion microspheres are added to the formula according to 2-10% of the PLA particle raw material; and the balance is the PLA particle raw material.

[0011] The method for preparing low-odor and low-density PLA is characterized in that: The following steps are included: First: Grind the molecular sieve and add the molecular sieve powder into the formula at 2-10% of the PLA particle raw material; Second: Add controlled high temperature expansion microspheres into the formula at 2-10% of the PLA particle raw material; Third: granulation.

[0012] A further technical solution of the present invention is that the controllable high temperature expansion microsphere is a thermoplastic hollow high molecular polymer microsphere, which is composed of a thermoplastic polymer shell and sealed alkane gas.

[0013] A further technical solution of the present invention is that when the controllable high temperature expandable microspheres are heated, the gas pressure in the shell increases and the thermoplastic volume increases significantly; when cooled, the shell of the controllable high temperature expandable microspheres hardens again and the volume is fixed.

[0014] The use of low-odor and low-density PLA in the production of degradable lightweight packaging materials and degradable daily necessities.

[0015] The present invention adopting the above technical solution has the following beneficial effects compared with the prior art: while reducing the odor of the material, it can also reduce the density of the PLA product, thereby reducing the use cost of the PLA product. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to further illustrate the present invention, the following is further described in conjunction with the accompanying drawings: Figure 1 A diagram of the steps of the invention. DETAILED DESCRIPTION

[0017] The present invention will be further explained below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the following specific embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention.

[0018] The low-odor and low-density PLA is characterized in that it contains the following weight components: the powder after the molecular sieve is ground is added to the formula according to 2-10% of the PLA particle raw material; the controllable high-temperature expansion microspheres are added to the formula according to 2-10% of the PLA particle raw material; and the balance is the PLA particle raw material.

[0019] The method for preparing low-odor and low-density PLA is characterized in that: The following steps are included: First: Grind the molecular sieve and add the molecular sieve powder into the formula at 2-10% of the PLA particle raw material; Second: Add controlled high temperature expansion microspheres into the formula at 2-10% of the PLA particle raw material; Third: granulation.

[0020] A further technical solution of the present invention is that the controllable high temperature expansion microsphere is a thermoplastic hollow high molecular polymer microsphere, which is composed of a thermoplastic polymer shell and sealed alkane gas.

[0021] A further technical solution of the present invention is that when the controllable high temperature expandable microspheres are heated, the gas pressure in the shell increases and the thermoplastic volume increases significantly; when cooled, the shell of the controllable high temperature expandable microspheres hardens again and the volume is fixed.

[0022] The use of low-odor and low-density PLA in the production of degradable lightweight packaging materials and degradable daily necessities.

[0023] Molecular sieve refers to a substance with uniform micropores that can sieve different molecules because its pore size is comparable to the size of the molecule. It is a kind of aluminosilicate microporous crystal, with a basic skeleton structure composed of silicon oxygen and aluminum oxygen tetrahedrons. There are many channels with uniform pore size and holes with disordered arrangement and large internal surface area in the structure.

[0024] The basic principle, main features and advantages of the present invention are shown and described above. Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and these changes and improvements all fall within the scope of the protection required.

Claims

1. Low odor and low density PLA, characterized by: The material comprises the following weight components: the powder after the molecular sieve is ground is added into the formula according to 2-10% of the PLA particle raw material; the controllable high temperature expansion microsphere is added into the formula according to 2-10% of the PLA particle raw material; the balance is the PLA particle raw material.

2. A method for preparing low-odor and low-density PLA, characterized in that: The following steps are included: First: Grind the molecular sieve and add the molecular sieve powder into the formula at 2-10% of the PLA particle raw material; Second: Add controlled high temperature expansion microspheres into the formula at 2-10% of the PLA particle raw material; Third: granulation.

3. The method for preparing low-odor, low-density PLA as claimed in claim 2, characterized in that: The controllable high temperature expansion microsphere is a thermoplastic hollow polymer microsphere, which is composed of a thermoplastic polymer shell and sealed alkane gas.

4. The method for preparing low-odor, low-density PLA as claimed in claim 2, characterized in that: When the controllable high temperature expandable microspheres are heated, the gas pressure in the shell increases and the thermoplastic volume increases significantly; when cooled, the shell of the controllable high temperature expandable microspheres hardens again and the volume is fixed.

5. The use of low-odor and low-density PLA in the production of degradable lightweight packaging materials and degradable daily necessities.

Images