Gather ammonia ester the formula of the gum a design

The gum glue the design of with acquire end use function for purpose, glue to carry on a formula design towards gathering ammonia ester gum, in consideration of the gum make into glue the construction(maneuverability) of , solid turn a condition and glue to connect strength, heat-proof, bear chemistry character, durable etc. function request.

1.Gather the ammonia ester member design-structure and function

Gather ammonia ester because of its raw material species and constitute of diverse sex, as a result can synthesize the high mark sub- material of various each kind function, for example strict from the external appearance of its essence material(namely don't contain melting agent) lord speak, can get from soft to strong and tough of flexibility body, foam material, gather ammonia ester from its essence property(perhaps say it solid turn a thing) but speech, basic preceding batch flexibility body property, it of some physics chemistry property such as glue to connect strength, machine function, durable, bear low temperature, bear drugs, main be decided by bornly gather ammonia ester solid turn the chemistry structure of thing, so, carry on formula design towards gathering ammonia ester gum to glue, want to carry on member design first, namely from the chemistry structure and constitute to the function of influence to understanding, relevant gather the ammonia ester raw material species and chemistry structure and function of relation.

2. Glue a making to carry on a design to the PU gum from the raw material angle

Gather ammonia ester gum to glue a formula in general use three types of raw material:1 type is NCO raw material(namely two difference cyanic acid ester or it change a sex thing, many difference cyanic acid ester), 1 type have another 1 type as additives, such as melting agent and catalyst...etc. for the oH raw material(namely contain Qian Ji of low gather the thing diverse Chun and expand chain etc., broadly speaking, is contain an activity hydrogen of compound, so also include diverse An, water...etc.), carry on formula design towards gathering ammonia ester gum to glue from the angle of raw material and its method have bottom to say 2 kinds.

(1).From above-mentioned raw material direct prepare

Most simple of gather ammonia ester gum to glue to prepare a method is 0 H raw material and NCO raw material(or and additive) in brief mixture, direct usage, this kind of method is in gather the ammonia ester the gum glue a formula design seldom adoption, reason is majority low gather a thing diverse Chun molecular weight lower(usually gather ether Mr<6000, polyester Mr<3000), as a result the gum prepare glue combination thing to glue one degree small, beginning glue dint small, sometimes even add catalyst, solid turn speed still slower, and solid turn thing strength low, practical value not big, and have never change sex of the TDI fume press higher, smell big, vaporize a toxicity big, but MDI normal temperature bottom is solid, usage inconvenient, only minority a few kinds commercialize many difference cyanic acid ester such as the RFCoronate L of the PAPlDesmodur RDesmodur etc. can used to difference cyanic acid ester raw material.

However, have a few circumstance can with the above-mentioned method go together with gather ammonia ester gum to glue for example 1)from Gao the organic aqua of the molecular weight polyester(Mr5000-50000) with many difference cyanic acid ester the aqua(like Coronate L) constitute of double set cent gather ammonia ester gum to glue, can used for compound layer to press thin film etc. use, function better, this is because of it lord composition Gao the molecular weight polyester have higher of beginning start to glue to connect dint, constitute of the gum glue to band together strength big;(2)from gather ether(or polyester) or and water, many difference cyanic acid ester, catalyst etc. go together with of combination thing, Be hair bubble the type gather ammonia ester gum glue, glue match, used for heat preservation material etc. of glue connect manufacturing etc., have certain of practical value.

(2).NCO and OH raw material in advance the ammonia ester turn to change sex

As state above, because of majority low gather the molecular weight of the thing diverse Chun lower, and the TDI vaporize a toxicity big, MDI normal temperature bottom is a solid, direct go together with into gum general function more bad, past for the sake of exaltation the gum glue of beginning start to glue a degree, shorten creation certain glue to connect time that the strength need, usually gather ether or the polyester diverse Chun and TDI or MDI list body reaction, the ammonia Ji A sour ester which make in to carry NCO Ji or OH Ji prepare to gather a thing, Be NCO composition or OH composition usage.

3. From the usage the request of the appearance design PU gum

From gather ammonia ester gum to glue the usage appearance of to cent, main have list set cent and double set cent.

A.List set cent gather ammonia ester gum to glue

List set cent gather ammonia ester gum to glue the advantage of is direct usage, matchless set cent the gum glue an usage front need to adjust gum of bother?List set cent gather ammonia ester gum to glue main have bottom to say 2.

(1)With one NCO for carry Ji of gather ammonia ester prepare gather the thing as corpus of wet solid turn gather ammonia ester gum glue, synthesize reaction make use of air in little humidity and base material surface little adsorbed water but solid turn, return can with base material surface activity hydrogen Ji regiment reaction formation firm chemistry key, this kind of type of gather ammonia ester gum general is have no melting agent type, because of for the sake of easy to Shi Jiao, glue a degree can't too big, list set cent wet solid turn gather ammonia ester the gum glue many in order to gather an ether type, namely main of contain one OH raw material for gather ether diverse Chun, this kind in the gum swim leave a NCO content actually with degree is proper, should according to gum of glue a degree(influence maneuverability), Tu2 Jiao's way, Tu2 Jiao's thickness and drive glue a thing type etc. but settle, and want consideration gum of store and save stability(2) with hot the Su gather ammonia ester flexibility body for foundation of list set cent the melting agent type gather ammonia ester the gum glue, lord composition for Gao the molecular weight carry OH Ji the line type gather ammonia ester, Qian cardinal number very small, be the melting agent start vaporize gum of glue a degree quick increment, creation beginning glue dint, be melting agent basically complete vaporize after, creation enough of glue and connect dint, through indoor temperature place, most should the type gather an ammonia ester flexibility chain in body segment crystallize, can further exaltation glue connect strength, this kind of type of list set cent gather an ammonia ester gum general with crystallinity polyester conduct and actions gather an ammonia the main raw material of the ester.

List set cent gather ammonia ester gum moreover still have already gathered the ammonia ester hot Rong gum, list set cent water gather ammonia ester gum to glue an etc. type.

B.Double set the cent gather ammonia ester gum to glue

Double set cent gather ammonia ester gum to glue from contain to carry Qian Ji of lord with contain to carry the regiment of NCO Ji of solid turn to constitute, with list set cent compare, double set cent function good, glue to connect strength Gao, and the same kind of double set cent gather ammonia ester gum to glue of two sets of allotment ratio can allow certain of scope, can this regulate solid turn a thing of function, lord general in order to gather the ammonia ester diverse Chun or the high mark sub- polyester diverse Chun, two sets of cent of go together with ratio with solid turn slightly surfeit, then have little the NCO Ji regiment excess is proper, such can make up possibility of the humidity result in of NCO loss, assurance the gum glue creation enough of hand over allied reaction.

4. Basis function request design PU gum

If have special function request towards gathering ammonia ester gum to glue, should according to gather the ammonia ester structure and function of relation carry on formula design, dissimilarity of base material, dissimilarity of application realm and application environment, usually to gather ammonia ester gum to have some special request, such as at industrialization produce on-line usage of gather the ammonia ester gum request fast solid turn, compound the tetrapak thin film use of gather ammonia ester gum glue request acid-proof bear water solution, among them bear to steam to cook a tetrapak glue with the gum still request certain degree of the heat glue to connect dint, etc..

A.Bear heat

Gather ammonia ester gum to glue one widespread bear heat function shortage, if want at special and hot-resistant situation usage, can in advance to gather ammonia ester gum to glue carry on design, have a few path can exaltation gather ammonia ester gum of heat-proof, such as 1)adoption contain the ether, polyester and difference cyanic acid ester of the gather of benzene wreath raw material;(2)exaltation difference cyanic acid ester and expand the content (3)of chain;exaltation solid turn a dosage;(4)adoption bear heat hot solution of many difference cyanic acid ester(such as contain difference the cyanotype Mao sour ester wreath of), or at solid turn creation difference the cyanotype Mao sour ester;(5)use more hot-resistant epoxy or gather Mao Mao An etc. resin with gather ammonia ester total mix to change sex, but adoption pN technique is exaltation polymer compatibility of valid path.

B.Bear a water solution

Polyester type gather ammonia ester gum to glue of bear a water solution more bad, can add water solution stability(BE two second Ans such as the carbonization?Wreath oxygen compound etc.)carry on improvement, for the sake of exaltation the bear of polyester water solution, can adoption long chain 2 dollars be sour and 2 dollars Chun raw material(such as J two sour, 1,6-F two Chun etc.), have chain of 2 dollars Chun such as new E two Chun raw material also ability exaltation the bear of polyester water solution?Gather the bear of ether water solution better, sometimes can counteract making to gather ammonia ester gum to glue with polyester, add in the gum glue a formula a little amount organic Huo accidentally allied also ability exaltation the gum glue a bear of layer a water solution.

C.The exaltation is solid to turn speed

Exaltation solid turn a kind of main method of speed is make to gather ammonia ester gum to glue to have certain of beginning glue dint, then glue to connect behind no longer easy escape from, as a result exaltation lord the molecular weight of, usage can creation crystallinity's gathering the raw material of ammonia ester be an exaltation beginning glue dint with solid turn speed of valid method, sometimes join a little amount three ether Ans' being this type of be catalyst to hand over allied also contribute to exaltation beginning glue dint?Add catalyst as well for speed solid turn of main.