CN-121975185-A - Guanine PVC heat stabilizer and application thereof

Abstract

The invention discloses a guanine PVC heat stabilizer and application thereof, and belongs to the technical field of heat stabilizers. The heat stabilizer is guanine or guanosine or a compound of a main stabilizer and an auxiliary stabilizer, wherein the main stabilizer is guanine or guanosine, and the auxiliary stabilizer is at least one of a calcium salt stabilizer, a zinc salt stabilizer and a polyol stabilizer. The guanine heat stabilizer disclosed by the invention can improve the initial whiteness of PVC, endows the PVC with better long-term stability, can be used for preparing PVC composite materials, improves the heat stability and mechanical properties of the PVC composite materials, and meets the use requirements of PVC composite materials in most scenes.

Inventors

• YE FENG
• YOU CHENG
• YAN ZHIHAO
• MA HAORAN
• ZHENG QINGSONG

Assignees

• 绍兴文理学院

Dates

Publication Date

20260505

Application Date

20260403

Claims (9)

1. 1. The guanine PVC heat stabilizer is characterized in that the heat stabilizer is a compound of a main stabilizer and an auxiliary stabilizer or is only the main stabilizer, the main stabilizer is guanine or guanosine, and the auxiliary stabilizer is at least one of a calcium salt stabilizer, a zinc salt stabilizer and a polyol stabilizer.
2. 2. The guanine-based PVC heat stabilizer according to claim 1, wherein when the heat stabilizer is a compound of a main stabilizer and a zinc salt-based stabilizer, the mass ratio of the main stabilizer to the zinc salt-based stabilizer is >1.
3. 3. The guanine-based PVC heat stabilizer according to claim 2, wherein the mass ratio of the main stabilizer to the zinc salt-based stabilizer is (1.5-4): 1.
4. 4. The guanine-based PVC heat stabilizer according to claim 1, wherein the calcium salt-based stabilizer is calcium stearate, the zinc salt-based stabilizer is zinc stearate, and the polyol-based stabilizer is galactitol or mannitol.
5. 5. The guanine PVC heat stabilizer according to claim 1, wherein the heat stabilizer is a compound of a main stabilizer and zinc stearate and galactitol, and the mass ratio of the main stabilizer to the zinc stearate and the galactitol is (1-3): 1 (0.5-2).
6. 6. The guanine PVC heat stabilizer according to claim 1, wherein the heat stabilizer is a compound of a main stabilizer, zinc stearate and mannitol, and the mass ratio of the main stabilizer to the zinc stearate and mannitol is (0.5-3) 1 (0.5-3).
7. 7. Use of a guanine-based PVC heat stabilizer according to any one of claims 1-6, for the preparation of PVC composites.
8. 8. The use of a guanine based PVC heat stabilizer according to claim 7, wherein said heat stabilizer is used for the preparation of PVC/rice hull composite.
9. 9. The use of a guanine type PVC heat stabilizer according to claim 8, wherein the PVC resin, the plasticizer, the heat stabilizer, the silane coupling agent modified rice hull fiber are uniformly mixed and then molded to obtain the PVC/rice hull composite material.

Description

Guanine PVC heat stabilizer and application thereof Technical Field The invention relates to the technical field of heat stabilizers, in particular to a guanine PVC heat stabilizer and application thereof. Background PVC, polyvinyl chloride, is a synthetic resin with excellent comprehensive properties, and is polymerized by vinyl chloride monomer under specific conditions according to the mechanism of free radical polymerization. PVC has poor light and heat stability, and can generate decomposition reaction when the temperature reaches more than 120 ℃ or the PVC is exposed to sunlight for a long time. Chlorine atoms on the macromolecular chain segments combine with ortho-position hydrogen atoms to generate hydrogen chloride (HCl) and generate carbon-carbon double bonds, and the released HCl catalyzes the decomposition of PVC, resulting in vicious circle. Along with the continuous release of chlorine atoms, conjugated double bonds are continuously generated, the color of the PVC material is gradually deepened, and the mechanical property is also rapidly reduced. In the production and processing process, the PVC is usually required to be raised to a higher temperature, so that an appropriate amount of heat stabilizer is required to be added in the practical application to improve the processability and the practicability of the PVC. With the development of technology, the PVC heat stabilization technology is continuously developed, and heat stabilizers which have influence on the environment in the past gradually exit from the stage, so that the organic nitrogen heat stabilizers are rapidly developed in recent years due to the outstanding environment protection characteristics. The current research on organic nitrogen heat stabilizers mainly focuses on thiourea heat stabilizers and pyrimidine heat stabilizers, and the application research on guanine and derivatives thereof in PVC heat stabilizers is still in a blank state. Therefore, the development of a novel heat stabilizer which is efficient, has good cooperativity with zinc salts and can be suitable for PVC composite materials becomes an urgent need of industry. Disclosure of Invention The invention aims to overcome the defects of the prior art and provides a guanine PVC heat stabilizer and application thereof. In order to achieve the above purpose, the present invention adopts the following technical scheme: A guanine PVC heat stabilizer is a compound of a main stabilizer and an auxiliary stabilizer or is only the main stabilizer, wherein the main stabilizer is guanine or guanosine, and the auxiliary stabilizer is at least one of a calcium salt stabilizer, a zinc salt stabilizer and a polyalcohol stabilizer. The invention is further arranged that when the heat stabilizer is a compound of the main stabilizer and the zinc salt stabilizer, the mass ratio of the main stabilizer to the zinc salt stabilizer is more than 1. The invention further provides that the mass ratio of the main stabilizer to the zinc salt stabilizer is (1.5-4): 1. The invention further provides that the calcium salt stabilizer is calcium stearate, the zinc salt stabilizer is zinc stearate, and the polyalcohol stabilizer is galactitol or mannitol. The invention further provides a compound of the main stabilizer, zinc stearate and galactitol, wherein the mass ratio of the main stabilizer to the zinc stearate to the galactitol is (1-3): 1 (0.5-2). The invention further provides a compound of the main stabilizer, zinc stearate and mannitol, wherein the mass ratio of the main stabilizer to the zinc stearate to the mannitol is (0.5-3) 1 (0.5-3). The use of a guanine-based PVC heat stabilizer as described above for the preparation of PVC composites. The invention further provides that the heat stabilizer is used for preparing a PVC/rice hull composite material. The invention further provides a PVC/rice hull composite material which is obtained by uniformly mixing PVC resin, plasticizer, heat stabilizer and silane coupling agent modified rice hull fiber and then performing compression molding. In summary, the invention has the following beneficial effects: The invention uses guanine or guanosine as key component, which can be used alone as PVC heat stabilizer or compounded with auxiliary stabilizer to form heat stabilizer, with the advantages of that guanine substance itself can provide good long-term heat stability for PVC, and can cooperate with zinc salt such as zinc stearate to improve initial whiteness and long-term stability of PVC, and simultaneously, polyol such as galactose alcohol, mannitol and the like is added into the compound of guanine or guanosine and zinc salt, which can effectively inhibit zinc burning problem, further improve heat stability effect of PVC. The heat stabilizer disclosed by the invention can be extended to the fields of PVC/rice hull composite materials and the like, the mechanical property and the thermal stability of the composite materials are enhanced while