Wɔ rɔba a wɔde afrafra mu no, wɔyɛ compression daa deformation tests pii sen tensile permanent deformation tests. Sɛnea yɛbɛka ho asɛm wɔ ase hɔ no, rɔba aduru bi afã horow pii nya ne deformation su so nkɛntɛnso. Ɛsɛ sɛ yɛhyɛ no nsow wɔ ha sɛ compressive daa deformation ne tensile daa deformation yɛ su ahorow abien. Enti, nea ɛma compression no tu mpɔn daa deformation no nkyerɛ sɛ ɛbɛma tensile daa deformation atu mpɔn, ne nea ɛne no bɔ abira. Bio nso, wɔ rɔba a wɔde hyɛ nneɛma mu no ho no, compressive permanent deformation nyɛ ade pa a ɛkyerɛ sɛnea wɔde hyɛ nhyɛso anaasɛ wɔde hyɛ mu. Mpɛn pii no, dodow no ara na ɛsɛ sɛ wɔyɛ compressive stress relaxation experiment no yiye, dodow no ara na wɔhyɛ ade no sealing adwumayɛ ho nkɔm yiye.

Wɔde nhwehwɛmu protocol ahorow a edidi so yi di dwuma de ma rɔba no mu nsakrae a ɛwɔ hɔ daa no tu mpɔn. Hyɛ no nsow: Ebia saa nhwehwɛmu nhyehyɛe ahorow yi rentumi nyɛ adwuma wɔ nsɛm no nyinaa mu. Bio nso, nsakrae biara a ebetumi atew daa deformation so wɔ compression anaa tension mu no betumi aka properties afoforo na wɔrenni ho dwuma wɔ nkyerɛwee no mu.

1. Vulcanization nhyehyɛe .

Susuw peroxides a wɔde di dwuma sɛ vulcanizing agents, a ebetumi ayɛ CC cross-linked bonds na ɛnam so ama rɔba no asɛe koraa no ho. Vulcanization a ethylene propylene rɔba a wɔde peroxide yɛ no betumi atew compression daa deformation a rɔba no so. Mfaso a ɛwɔ peroxide so wɔ sulfur so ne sɛnea ɛyɛ mmerɛw sɛ wɔde peroxide bedi dwuma ne rɔba no a ɛyɛ mmerɛw sɛ ɛbɛsɛe no daa no.

2. Vulcanization bere ne ɔhyew .

Vulcanization ɔhyew a ɛkorɔn ne vulcanization bere tenten betumi ama vulcanization dodow akɔ soro ma enti ɛtew compression set a ɛwɔ rɔba no mu no so.

3. cross-linking density .

Sɛ wɔma rɔba no crosslinking density no yɛ kɛse a, ebetumi atew rɔba no a ɛbɛsɛe no daa no so yiye.

4. Sulfur vulcanization nhyehyɛe .

Sɛnea ɛbɛyɛ a yɛbɛtew EPDM aduru no mu a ɛyɛ compressive daa no so na yɛama ɔhyew a ɛko tia no atu mpɔn no, yebetumi asusuw saa 'low deformation' vulcanization system (mass): Sulfur 0.5PHR, ZDBC 3PHR, ZMDC 3PHR, DTDM 2PHR, TMTD3PHR.

Wɔ W type neoprene mu no, diphenylthioureea accelerator a wɔde di dwuma no betumi ama rɔba a ɛwɔ compression a ɛba fam daa deformation no ayɛ, nanso kwati sɛ wɔde CTP bedi dwuma sɛ anti-coke agent, ɛwom sɛ ebetumi ama bere a wɔde hyew no no akyɛ de, nanso ɛwɔ ɔsɛe kɛse wɔ compression daa deformation ho.

Wɔ NBR rɔba ho no, wɔ vulcanization nhyehyɛe a wɔapaw no mu no, ɛsɛ sɛ wɔtew sulphur dodow so, bɔ mmɔden sɛ wode sulfur bedi dwuma de ama nipadua te sɛ TMTD anaa DTDM de asi sulfur no fã bi ananmu, sulfur nneɛma kakraa bi na ɛbɛma rɔba no a wɔde hyɛ mu daa no ayɛ adwuma yiye. Vulcanization nhyehyɛe a ɛwɔ HVA-2 ne hyposulfuramide no betumi ayɛ rɔba a ɛwɔ compression daa deformation a ɛba fam.

5. Peroxide vulcanization nhyehyɛe .

BBPIB peroxide a wɔpaw no bɛma rɔba no ayɛ nea ɛyɛ mmerɛw yiye wɔ nhyɛso mu. Wɔ peroxide vulcanization nhyehyɛe mu no, co-crosslinkers a wɔde di dwuma no ma unsaturation a ɛwɔ nhyehyɛe no mu no yɛ kɛse, a ɛno nso ma crosslink density a ɛkorɔn ba, efisɛ free radicals a ɛwɔ unsaturated bonds no crosslinking no ba ntɛmntɛm sen sɛ wobegye hydrogen afi staturated chains mu. Co-crosslinkers a wɔde di dwuma no sesa crosslinking network no su na ɛnam so ma compression permanent deformation properties a ɛwɔ adhesive no mu no tu mpɔn.

6. Vulcanization akyi .

Vulcanization by-products wɔ hɔ wɔ vulcanization nhyehyɛe no mu, na post-vulcanization nhyehyɛe wɔ wim nhyɛso mu ma kwan ma saa nneɛma a ɛka ho yi fi adi, na ɛnam so ma rɔba no nya nhyɛso a ɛba fam.

7. Fluoroelastomer FKM/Bisphenol AF Vulcanization .

Wɔ fluoroelastomers ho no, bisphenol vulcanizing agent a wɔde di dwuma sen sɛ wɔde peroxide vulcanizing agent bedi dwuma no betumi ama rɔba no ayɛ mmerɛw koraa wɔ nhyɛso mu.

8. Nkɛntɛnso a molecule mu duru nya .

Wɔ rɔba nhyehyɛe mu no, rɔba a wɔpaw a sɛ wɔkyekyem pɛpɛɛpɛ a, molecule mu duru kɛse no betumi atew rɔba no mu nhyɛso a ɛtra hɔ daa no so yiye.

Wɔ NBR rɔba ho no, ɛsɛ sɛ wɔde rɔba a ɛwɔ mooney viscosity a ɛkorɔn di dwuma, a ebetumi ayɛ rɔba a ɛwɔ compression ketewaa biara a ɛbɛsɛe no.

9. Neoprene .

W Type Neoprene wɔ compression daa deformation a ɛba fam sen G type neoprene.

10. EPDM .

Sɛ wopɛ sɛ woyɛ rɔba a ɛwɔ compression daa deformation a, bɔ mmɔden sɛ wobɛkwati sɛ wode EPDM rɔba a ɛwɔ crystallinity a ɛkorɔn bedi dwuma.

11. NBR .

NBR, a ɛyɛ emulsion polymerized ne calcium chloride sɛ coagulant no taa yɛ nea ɛba fam a wɔde hyɛ mu.

Wɔ NBR rɔba ho no, sɛ wopɛ sɛ wode w’adwene si ne compression daa deformation adwumayɛ so a, ɛnde bɔ mmɔden sɛ wobɛpaw ahorow a ɛwɔ nkorabata a ɛkorɔn ne nkɔnsɔnkɔnsɔn a ɛkorɔn anaasɛ ahorow a ɛwɔ acrylonitrile a ɛba fam.

12. Ethylene-acrylate rɔba .

Wɔ AEM rɔba ho no, peroxide vulcanizing agents betumi ama compression set a ɛba fam sen diamine vulcanizing agents.

13. Resin-gyinaso homogenizers .

Kwati sɛ wode resin-based homogenizers bedi dwuma wɔ rɔba nnuru mu, efisɛ eyi ma compression set a ɛwɔ compound no mu no yɛ kɛse.

14. Nneɛma a wɔde hyɛ mu .

Mpɛn pii no, sɛ wɔtew afiri a wɔde hyɛ mu, sɛnea wɔahyehyɛ no ne baabi pɔtee a wɔde hyɛ mu no so (sɛ wɔma nneɛma nketenkete no kɛse yɛ kɛse) a, ɛbɛtew nhyɛso a wɔde ahyɛ mu no so. Bere koro no ara mu no, filler no ani dwumadi a ɛkɔ soro no nso betumi ama compression set resistance a ɛwɔ compound no mu no atu mpɔn.

15. Silica .

Silica filler a ɛwɔ aduru no mu no bɛtew compression set no so. Sɛnea ɛbɛyɛ a wobenya nhyɛso a ɛba fam no, ɛho hia sɛ wɔkwati sɛ wɔde silica bɛhyɛ mu ma. Sɛ dodow a wɔde hyɛ mu no boro afã horow 25 (ɛnam kɛse so) a, aduru no a ɛbɛsɛe no daa no bɛyɛ kɛse.

16. Silane a ɛka bom yɛ ade .

Sɛ yesusuw sɛnea wɔde silane coupling agent di dwuma wɔ silica a ɛtɔ kɛse a ɛhyɛ ma no mu a, wobetumi atew compression daa deformation a ɛwɔ adhesive no so no so. Silane coupling agent betumi atew compression daa deformation a silica ahyɛ no ma rɔba, na nso ɛtew compression daa deformation of silicate type filler te sɛ dɔte, talcum powder ne afoforo a wɔahyɛ no ma rɔba.

17. Nneɛma a wɔde yɛ plastic .

Mpɛn pii no, plasticizer dodow a wɔde hyɛ rɔba no mu a wɔbɛtew so no bɛtew rɔba no a ɛbɛsɛe no daa no so.