CN-121975237-A - Low-VOC (volatile organic compound) high-weather-resistance PCR-PP (polymerase chain reaction-polypropylene) composite material and preparation method thereof

CN121975237ACN 121975237 ACN121975237 ACN 121975237ACN-121975237-A

Abstract

The invention relates to the technical field of polymer material auxiliary agents, and discloses a low VOC high weather-proof PCR-PP composite material and a preparation method thereof, wherein the composite material comprises, by weight, 5 to 15 parts of main stabilizing component containing piperidine ring structure, 2 to 8 parts of aliphatic polyol with hydroxyl value of 1600 to 1650mgKOH/g, 10 to 30 parts of organic modified magnesium aluminum hydrotalcite with interlayer spacing of more than 2.6nm, and 110 parts of component Deposition and 130 Wetting the compound, at 180 to 210 The invention builds a physical pinning structure by utilizing intermolecular forces among components, improves the diffusion activation energy of main stable components in a matrix, inhibits migration loss, and in-situ neutralizes acidic oxidation intermediates generated by aging of regenerated polypropylene by modified magnesium-aluminum hydrotalcite-like basic active sites to eliminate peculiar smell sources.

Inventors

LIU LIANFEI
LUO LE
ZUO JINHUA
HUO SONG
LI XIAOYING

Assignees

重庆华塑科技有限公司

Dates

Publication Date: 20260505
Application Date: 20260116

Claims (10)

1. The low-VOC high-weather-resistance PCR-PP composite material is characterized by comprising the following components in parts by weight: 5 to 15 parts of a main stabilizing component which is a hindered amine light stabilizer containing a piperidine ring structure; 2 to 8 parts of a polyol component having at least three hydroxyl groups and a hydroxyl number of To the point of Aliphatic polyols of (a); And 10 to 30 parts of a modified hydrotalcite-like carrier having an interlayer spacing Greater than Organically modified magnesium aluminum hydrotalcite-like compound; wherein the mass ratio of the polyol component to the main stabilizing component is To the point of The components have a microcoded structure formed by the following preparation procedures that a modified hydrotalcite-like carrier is arranged on the surface of the component To the point of Is preheated to under shearing environment of (2) Adding a polyol component for dry mixing, so that the polyol component is physically deposited on the lamellar edges of the modified hydrotalcite-like carrier; Heating to And introducing a primary stabilizing component to melt and wet the polyol component, the primary stabilizing component being present in The dynamic viscosity is as follows To the point of ; Finally, the mixture is extruded by a co-rotating double screw extruder To the point of Under the melt shear field of (2), hydrogen bond network is formed between hydroxyl groups of the polyol component and nitrogen atoms of the main stabilizing component, and the thickness is formed on the surface of the modified hydrotalcite-like carrier To the point of To pin the primary stabilizing component to the surface of the modified hydrotalcite-like support.
2. The low VOC high weather resistant PCR-PP composite material according to claim 1, wherein the main stabilizing component further comprises a hindered phenol antioxidant, and the mass ratio of the hindered amine light stabilizer to the hindered phenol antioxidant is To the point of Wherein the aliphatic polyol has a purity of not less than And melting point is To the point of Wherein the total molar amount of hydroxyl groups of the polyol component Total nitrogen atom mole weight with the primary stabilizing component The following stoichiometric formula is satisfied: , wherein, Is the interfacial hydrogen bond saturation coefficient of the component, and Has a value of 3 to 8.
3. The low VOC high weatherable PCR-PP composite according to claim 1, wherein the interlayer modification anion of the modified hydrotalcite-like carrier is selected from stearate, dodecylbenzenesulfonate or a combination thereof, and the particle size of the modified hydrotalcite-like carrier Is that To the point of Specific surface area of To the point of 。
4. The low VOC high weatherable PCR-PP composite of claim 1, wherein the coating layer exhibits a double-layer interfacial physical structure comprising an inner anchoring layer of a polyol component adsorbed onto the modified hydrotalcite-like support surface and an outer associating layer of a primary stabilizing component coated on the outside of the inner anchoring layer.
5. The low VOC high weatherable PCR-PP composite of claim 1, wherein the primary stabilizing component is in the form of a blend of Dynamic viscosity in molten state of To the point of The primary stabilizing component is allowed to fully wet and coat the physical deposition surface of the polyol component in a melt shear field.
6. The low-VOC high-weather-resistance PCR-PP composite material according to claim 1, wherein alkaline active sites are distributed on the surface of the modified hydrotalcite-like compound carrier, the alkaline active sites capture acidic oxidation intermediates generated by thermal oxidative aging of regenerated polypropylene through physical adsorption, and the acidic oxidation intermediates comprise carboxylic acids and aldehydes.
7. The low VOC high weatherable PCR-PP composite according to claim 1, wherein the components are The thermal weight loss rate under the condition is maintained at To the point of Between them.
8. The low VOC high weather resistant PCR-PP composite material according to claim 1, wherein the components are physically blended and melt compounded to form a particle size of To the point of Is a fine powder of (a) a fine powder of (b).
9. The low VOC high weatherable PCR-PP composite of claim 1, wherein the hydrogen bonding network forms a semi-compatible transition phase in the polypropylene matrix, the semi-compatible transition phase having a modulus between the modified hydrotalcite-like support and the polypropylene matrix, the primary stabilizing component being confined by the hydrogen bonding network within the coating of the modified hydrotalcite-like support surface, the diffusion activation energy of the primary stabilizing component in the recycled polypropylene matrix being higher than the diffusion activation energy of the primary stabilizing component in the free state.
10. A method for preparing a low-VOC high-weatherability PCR-PP composite material, characterized in that it is used for preparing the low-VOC high-weatherability PCR-PP composite material according to claim 1, comprising the steps of: Step 1101, placing the modified hydrotalcite-like compound carrier in To the point of Is preheated to under shearing environment of (2) Adding a polyol component for dry mixing, so that the polyol component is physically deposited on the lamellar edges of the modified hydrotalcite-like carrier; Step 1102, heating to Introducing a main stabilizing component to enable the main stabilizing component to be melted on the surface of the modified hydrotalcite-like carrier and wet the polyol component; Step 1103, feeding the obtained pre-compound into a co-rotating twin-screw extruder, and in the following steps of To the point of Is subjected to melt extrusion under the temperature gradient of (1) to form a hydrogen bond network between the hydroxyl groups of the polyol component and the nitrogen atoms of the main stabilizing component, and form a thickness of the modified hydrotalcite-like carrier surface To the point of Is coated with a coating layer.

Description

Low-VOC (volatile organic compound) high-weather-resistance PCR-PP (polymerase chain reaction-polypropylene) composite material and preparation method thereof Technical Field The invention relates to a low-VOC high-weather-resistance PCR-PP composite material and a preparation method thereof, belonging to the technical field of high polymer material assistants. Background The current conventional formula adopts hindered phenol antioxidant and hindered amine light stabilizer ingredients to inhibit the thermal oxidative degradation process of a high molecular chain, and polypropylene is subjected to multiple times of thermal processing to generate a large number of chain segment degradation products and the free volume is increased, so that the diffusion energy barrier of ingredient molecules in a loose matrix is reduced. The prior proposal lacks a displacement constraint structure aiming at auxiliary agent molecules in an amorphous area of a regeneration matrix, is influenced by environmental temperature difference or long-term storage to enrich the auxiliary agent to the surface of the material to generate whitening and frosting, and the auxiliary agent molecules are degraded by photo-thermal induction on the surface to generate sense odor, the addition of the auxiliary agent or the delay of physical displacement by adopting a macromolecular stabilizer is easy to cause the compatibility unbalance between the auxiliary agent and the regeneration matrix, so that the auxiliary agent is subjected to phase separation in a melt extrusion stage and influences the stability of mechanical properties of the material, besides the limitations of the self-properties or carrier morphology of the auxiliary agent, the systematic treatment proposal aiming at the regeneration polypropylene also has defects in control logic, for example, the Chinese patent with the authority bulletin number of CN112135870B focuses on removing pollutants by high-energy physical means such as multi-stage solvent extraction, dissolution and filtration, and the like. Therefore, how to construct a coating layer with pinning effect on the surface of an inorganic carrier through hydrogen bond interaction among components on the premise of maintaining the chemical activity of the stabilizer, and to promote the diffusion activation energy of auxiliary agent molecules in a loose matrix become the technical problem to be solved by the invention. Disclosure of Invention In order to solve the problems in the background technology, the technical scheme of the invention is that the low VOC high weather-proof PCR-PP composite material comprises, by weight, 5 to 15 parts of main stabilizing components, wherein the main stabilizing components are hindered amine light stabilizers containing piperidine ring structures; 2 to 8 parts of a polyol component having at least three hydroxyl groups and a hydroxyl number of To the point ofAliphatic polyols of (a); And 10 to 30 parts of a modified hydrotalcite-like carrier having an interlayer spacing Greater thanOrganically modified magnesium aluminum hydrotalcite-like compound; wherein the mass ratio of the polyol component to the main stabilizing component is To the point ofThe components have a microcoded structure formed by the following preparation procedures that a modified hydrotalcite-like carrier is arranged on the surface of the componentTo the point ofIs preheated to under shearing environment of (2)Adding a polyol component for dry mixing, so that the polyol component is physically deposited on the lamellar edges of the modified hydrotalcite-like carrier; Heating to And introducing a primary stabilizing component to melt and wet the polyol component, the primary stabilizing component being present inThe dynamic viscosity is as followsTo the point of; Finally, the mixture is extruded by a co-rotating double screw extruderTo the point ofUnder the melt shear field of (2), hydrogen bond network is formed between hydroxyl groups of the polyol component and nitrogen atoms of the main stabilizing component, and the thickness is formed on the surface of the modified hydrotalcite-like carrierTo the point ofTo pin the primary stabilizing component to the surface of the modified hydrotalcite-like support. Preferably, the main stabilizing component further comprises a hindered phenol antioxidant, and the mass ratio of the hindered amine light stabilizer to the hindered phenol antioxidant isTo the point ofWherein the aliphatic polyol has a purity of not less thanAnd melting point isTo the point ofWherein the total molar amount of hydroxyl groups of the polyol componentTotal nitrogen atom mole weight with the primary stabilizing componentThe following stoichiometric formula is satisfied: , wherein, Is the interfacial hydrogen bond saturation coefficient of the component, andHas a value of 3 to 8 to ensure that the polyol component provides excess hydrogen bonding sites for the primary stabilizing component. Preferably, the