Synthesisand Application Of Vegetable Oil-based Polymers

Polyol is a kind of very important chemical intermediates,especially it is widely used in polyurethane foam.Nowadays,the raw materials of polyol are mainly derived from petrochemical resources,but petrochemical resources are limited and non-renewable,it has became the main trend to use natural renewable resources as a substitute.In recent years,green polymer materials research achieved greet progress,vegetable oil-based polymers have become a hot spot in polymer science research.With the development of society and the rise of people's living standard,the consumption of vegetable oil is increase and the waste vegetable oil is also increase.This is not only pollute the environment but also a kind of waste of resources.Our country is an important producer of vegetable oil and have abundant oil resources.Vegetable oil is the raw material of biodiesel.And we can obtain a wide range of epoxy vegetable oil by epoxidation,it can be further hydroxylated to obtain hydroxyl compounds under catalyst,it can be used to preparation of different hydroxyl value,molecular weight and viscosity of vegetable oil polyol,In this dissertation,we mainly focus on the researches of the synthesis,modification and application of vegetable oil-based polyols.The dissertation includes:1.Using waste Vegetable oil as raw materials to synthesized vegetable oil-based polyols by process of epoxidation,open ring and polymerization.Investigated the influence of multiple factors on each reaction,and obtained the optimum conditions of each reaction.Vegetable oil-based polyols were synthesized under these conditions,the content of plant was more than 95%,the acid value was 5.83 mgKOH/g,hydroxyl value was 78.38 mgKOH/g and epoxy value was 1.08 g/100g.IR spectra and 1H-NMR spectra showed that the products contain large amounts of hydroxyl and ether bond,and we had synthesized vegetable oil-based polyols successfully.And the GPC test showed that the molecular weight distribution was narrow.2.Using fatty acid methyl ester as raw materials to synthesized vegetable oil-based polyols by process of transesterification,epoxidation,open ring and polymerization.Investigated the influence of multiple factors on each reaction,and obtained the optimum conditions of each reaction.Vegetable oil-based polyols were synthesized under these conditions,the content of plant was more than 90%,the hydroxyl value was 77.35mgKOH/g,acid value was 2.25mgKOH/g and epoxy value was 0.28 g/100g.IR spectra and 1H-NMR spectra showed that the products contain large amounts of hydroxyl and ether bond,and we had synthesized vegetable oil-based polyols successfully.3.Novel vegetable oil-based polyols were synthesized by epoxy fatty acid methyl ester.Investigated the influence of initiator,catalyst,reaction temperature,reaction time on the reaction.Novel vegetable oil-based polyols were synthesized under the optimum conditions,the content of plant was more than 80%,the hydroxyl value was 82.48 mgKOH/g and epoxy value was 0.24 g/100g.IR spectra and 1H-NMR spectra showed that the products contain large amounts of hydroxyl,ether bond and benzene ring,and we had synthesized novel vegetable oil-based polyols successfully.And the GPC test showed that the molecular weight distribution is wide.4.Polyurethane foams were prepared by using self-made vegetable oil-based polyols.Effects of reaction conditions such as polyols,water content,material temperature on the foaming reaction were instigated.The results showed that foaming time could be significantly prolonged by increasing the content of self made polyols,but the prolong was shorter by using the novel vegetable oil-based polyols.The forming type and thermal stability at high temperature of soft PU foam were better,and the vegetable oil-based polyols can be used in soft PU foam.