Synthesize resinous of not saturated polyester former, complementary material

The former, complementary material that produces polyester includes not saturated and binary acid (or acid anhydride) with saturated and binary acid (or acid anhydride) , mellow or n duality is multivariate alcohol and cross-linking agent, block gets together the agent. One, not saturated n duality is acerbity (or acid anhydride) with saturated n duality acid1, the commonly used not saturated and binary acid on industry is suitable Ding Xi 2 acid anhydride (MA) (abbreviation arranges anhydride) and turn over Ding Xi 2 acid (FA) . Arrange anhydride to be among them commonly used, because of its price cheap and origin is wider. 2, full the place before adding up to binary acid to be like is narrated, saturated and binary acid is used when synthesizing not saturated polyester in all condensation polymerization can adjust Shuang Jian's density, make resinous flexible strengthen, improve polyester to be in Xi kind the dissolvability in monomer, reduce manufacturing cost. , commonly used in industrial colophony saturated acid is the adjacent benzene that has benzene loop form anhydride of 2 formic acid, abbreviation benzene anhydride (PA) . Benzene anhydride is used in typical rigid colophony, make eventually goods has certain tenacity. In mixture aether constituent benzene anhydride can reduce the crystallization liability of polyester, and because fragrant annulus structure is brought about,have good Xiang Rong sex like styrene with cross-linking monomer the 2nd make up glass reinforced plastics to produce material 3, not saturated acid and the scale with acerbity saturation are current not saturated polyester is You Shunding Xi 2 acid anhydride, benzene 2, among them typical polyester system is with the suitable anhydride that waits for Maerbi and benzene anhydride and excessive 2 alcohol make the third of 10% . If cast the suitable anhydride when makings / the Maerbi of benzene anhydride increases, criterion eventually resinous gel time, refractive index and viscosity drop, and solidify resinous softening point rises, hardness increases, bulk shrinkage also becomes tall accordingly, general dissolvent is able to bear or endure to reach in the meantime be able to bear or endure chemical sex is better. If arrange anhydride / the Maerbi of benzene anhydride is reduced, because decrescent of double key density, cross-linking is insufficient,will produce resin and eventually solidify is undesirable, the mechanical strength that causes goods drops. To synthesize the colophony that special function asks, can increase suitable anhydride appropriately / of benzene anhydride rub Er scale. 2, binary alcohol and multivariate mellow
Contain into not saturated polyester to basically use binary alcohol, a yuan of alcohol uses as molecular chain length controls an agent; And multivariate alcohol is used is to get the solid polyester with meshy bodily form, right now the opposite element quality of polyester often increases very fast and be hard to control. The colophony of not saturated polyester is commonly used binary alcohol on industrial production is 1, 2- third 2 alcohol, the n duality that ether key contains on glycol and molecular catenary is mellow -- ― shrinks glycol and shrink third 2 alcohol. 3, cross-linking agent
Before already remark, colophony of not saturated polyester is the ropy liquid that by not saturated polyester and cross-linking agent two parts comprise. From theoretic tell, the Xi that always can undertake cross-linking copolymerization with not saturated polyester kind the cross-linking agent that monomer can regard not saturated polyester as. But of the volatile, solidify that because suffer the compatibility of polyester amid, normal temperature,falls reach the limitation such as raw material price easily hard, want integrated consideration so, preferred choose. The condition that chooses cross-linking agent is: (１ ) can dissolve and attenuant not saturated polyester, earning colophony can solidify can produce copolymerization to add up to reaction namely; (2) function of the resinous after answering solidify is improved somewhat; (3) volatile low, low poison or avirulent; (4) resourceful, cost is low, preparation is simple and easy. 4, block gets together agentNot saturated polyester often meets preparation to become resinous in dilute reach in the process get in process of carry of resinous lay aside environmental medium (wait like smooth, hot, oxygen) affect and produce gel prematurely, bring about polyester colophony to discard as useless. To make although colophony has longer storage period,colophony gains the stability of keep in storage, can prevent the happening of aggregate reaction effectively below normal temperature or high temperature condition at the same time, reason is in generally a kind of substance is added when not saturated polyester and dissolve of cross-linking agent interblend become colophony, this kind of matter says get together for block agent.