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Folic acid modified nano titanium dioxide composite heat stabilizer for PVC and application thereof

A technology of nano-titanium dioxide and compound heat stabilizer, which is applied in the field of folic acid modified nano-titanium dioxide compound heat stabilizer for PVC, can solve the problems of high price of organotin, peculiar smell, unsatisfactory heat stabilization effect, etc., and achieve uniform particle size. , Strong synergistic effect, good dispersion effect

Active Publication Date: 2020-03-17
ANHUI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

With the continuous increase in the use of organotin heat stabilizers in the processing of PVC products, it has become a consensus to replace lead salt heat stabilizers, but organotin is expensive, has peculiar smell, and the heat stabilization effect cannot meet the needs

Method used

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  • Folic acid modified nano titanium dioxide composite heat stabilizer for PVC and application thereof
  • Folic acid modified nano titanium dioxide composite heat stabilizer for PVC and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Weigh 2.0 grams of titanium dioxide nanoparticles and disperse them in deionized water, configure them into a 5% titanium dioxide suspension, stir for 30 minutes, then take 0.1 grams of folic acid and dissolve them in deionized water, configure them into a 0.5% aqueous folic acid solution, stir and dissolve them for 30 minutes to obtain a uniform solution . Then add the folic acid solution to the titanium dioxide suspension, and carry out high-speed stirring treatment at 80° C. for 60 minutes. The folic acid is grafted onto the surface of the nanoparticles, heated for dehydration, and vacuum-dried to obtain folic acid-modified nano-titanium dioxide complex powder.

Embodiment 2

[0037] First, add 1 part of folic acid-modified titanium dioxide nanoparticles (folic acid mass content 5%), hydrotalcite (5 parts), and methyl tin mercaptide (0.5 parts) into DOTP (50 parts) and mix them mechanically at 80 ° C for 60 min Dissolve, then add to PVC resin (100 parts) and continue to mix and stir at 80°C for 30 minutes to obtain a uniform premix; place the obtained premix in a small internal mixer for banburying, the melt temperature is 170-178°C, The rotation speed is 40 rpm. After the shear force first decreases and then increases, the mixing time is 2-3 minutes. After the mixing is completed, the material is discharged, and the tablet is pressed to a thickness of 1 mm at 100 ° C by a flat vulcanizer to obtain a composite stabilizer. I PVC film.

Embodiment 3

[0039] Take 3 parts of folic acid-modified titanium dioxide nanoparticles (5% folic acid mass content), and the rest are the same as in Example 2 to obtain a PVC film containing composite stabilizer II.

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Abstract

The invention discloses a folic acid modified nano titanium dioxide composite heat stabilizer for PVC and application thereof. The folic acid modified nano titanium dioxide composite heat stabilizer for the PVC is prepared from the following components in parts by mass: 1.0-5.0 parts of folic acid modified nano titanium dioxide complex, 1.0-10.0 parts of hydrotalcite and 0.1-0.5 part of organic tin. According to the invention, an organic material is selected as a nanoparticle surface modifier, namely a natural compound-folic acid, and the surface characteristics of titanium dioxide nanoparticles are changed by changing surface charges and aggregation behaviors; and moreover, the natural vitamin-folic acid modified nano titanium dioxide complex, the co-stabilizer hydrotalcite and the organic tin generate a strong synergistic effect, the thermal stability is remarkably improved, and the folic acid modified nano titanium dioxide composite heat stabilizer for the PVC is non-toxic and goodin environmental compatibility.

Description

technical field [0001] The invention belongs to the field of processing aids for polymer materials, and in particular relates to a folic acid-modified nano-titanium dioxide composite heat stabilizer for PVC and its application. Background technique [0002] Polyvinyl chloride is the third most widely used plastic after polyethylene and polypropylene. It contains polar C-Cl bonds and is easy to modify. It has excellent corrosion resistance, good flame retardancy, chemical stability and low price. specialty. One of the main problems limiting its practical use is the low thermal stability and brittleness of the polymer, which is unstable when exposed to high temperatures during use. In order to improve this limitation and obtain high heat resistance, it is usually necessary to add heat Stabilizers such as lead salts, calcium-zinc complex metal salts, organotins, rare earths, hydrotalcites (LDHs) and organic compounds. With the increasing emphasis on environmental protection a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L27/06C08K9/04C08K3/22C08K5/58C08J5/18
CPCC08J5/18C08J2327/06C08K3/22C08K5/58C08K9/04C08K2003/2241C08K2201/011C08L27/06
Inventor 鲁伊恒王兵陈岩马龙娟李康薛梦瑶
Owner ANHUI UNIV OF SCI & TECH