Wɔ rɔba a wɔde afra mu no, wɔyɛ compression daa deformation sɔhwɛ pii sen tensile daa deformation sɔhwɛ ahorow. Sɛnea yɛbɛka ho asɛm wɔ ase hɔ no, rɔba aduru bi afã horow pii nya sɛnea ɛsakra no. Ɛsɛ sɛ yɛhyɛ no nsow wɔ ha sɛ compressive permanent deformation ne tensile permanent deformation yɛ su ahorow abien. Enti, nea ɛma compression permanent deformation tu mpɔn no, ɛnyɛ nea ɛma tensile permanent deformation tu mpɔn, ne nea ɛne no bɔ abira. Afei nso, wɔ rɔba nsɔano nneɛma ho no, compressive permanent deformation nyɛ ade pa a ɛkyerɛ sɛnea nsɔano nhyɛso anaa nsɔano adwumayɛ bɛyɛ. Mpɛn pii no, dodow a ɛyɛ den sɛ wɔbɛyɛ compressive stress relaxation sɔhwɛ no, dodow no ara na wɔhyɛ nkɔm sɛ ade no bɛyɛ adwuma yiye wɔ nsɔano mu.

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

1. vulcanization nhyehyɛe

Susuw peroxides a wɔde bedi dwuma sɛ vulcanizing agents, a ebetumi ayɛ CC cross-linked bonds na ɛnam so ama rɔba no asɛe daa no atu mpɔn ho. Vulcanization a ethylene propylene rɔba ne peroxide betumi atew compression daa deformation a rɔba no. Mfaso a ɛwɔ peroxide so sen sulphur ne sɛnea ɛnyɛ den sɛ wobedi peroxide ho dwuma ne sɛnea rɔba no yɛ mmerɛw a ɛmma ɛnyɛ den daa.

2. Vulcanization bere ne ɔhyew

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

3. Cross-linking density a ɛyɛ den

Nkɔanim crosslinking density rɔba no betumi atew compression daa deformation a rɔba no so yiye.

4. Sulfur vulcanization nhyehyɛe

Sɛnea ɛbɛyɛ a yɛbɛtew EPDM aduru no nhyɛso a ɛtra hɔ daa deformation so na yɛama ɔhyew a ɛko tia no atu mpɔn no, yebetumi asusuw saa 'low deformation' vulcanization system (mass) yi ho: sulfur 0.5PHR, ZDBC 3PHR, ZMDC 3PHR, DTDM 2PHR, TMTD3PHR.

Wɔ W type neoprene mu no, diphenylthiourea accelerator a wɔde di dwuma no betumi ama rɔba a ɛwɔ compression a ɛba fam no ayɛ deformation a ɛtra hɔ daa, nanso kwati sɛ wode CTP bedi dwuma sɛ anti-coke agent, ɛwom sɛ ebetumi ama bere a ɛhyew 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 sulfur 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 elements kakraa bi bɛma compression permanent deformation adwumayɛ a ɛwɔ rɔba no mu no atu mpɔn. Vulcanization nhyehyɛe a HVA-2 ne hyposulfuramide wom no betumi ama rɔba a ɛwɔ compression a ɛba fam no ayɛ deformation daa.

5. peroxide vulcanization nhyehyɛe

BBPIB peroxide a wɔpaw no bɛma rɔba no ayɛ deformation a ɛtra hɔ daa yiye wɔ compression mu. Wɔ peroxide vulcanization nhyehyɛe mu no, co-crosslinkers a wɔde di dwuma no ma unsaturation a ɛwɔ nhyehyɛe no mu no yɛ kɛse, na ɛno nso de crosslink density a ɛkorɔn ba, efisɛ crosslinking a free radicals a unsaturated bonds wom no ba ntɛmntɛm sen sɛ wobegye hydrogen afi saturated 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 vulcanization akyi adeyɛ wɔ wim nhyɛso mu ma wotumi gyae saa by-products yi, na ɛnam so ma rɔba no nya nhyɛso a ɛba fam.

7. Fluoroelastomer FKM/Bisphenol AF Vulcanization a wɔde yɛ adwuma

Wɔ fluoroelastomers fam no, bisphenol vulcanizing agent a wɔde di dwuma sen sɛ wɔde peroxide vulcanizing agent bedi dwuma no betumi ama rɔba no ayɛ nea ɛba fam daa deformation wɔ compression mu.

8. Nkɛntɛnso a molecule mu duru nya

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

Wɔ NBR rɔba ho no, ɛsɛ sɛ wɔde rɔba a ɛwɔ Mooney viscosity kɛse no di dwuma, a ebetumi ama rɔba a ɛwɔ nhyɛso ketewaa no ayɛ deformation daa.

9. Neoprene a wɔde yɛ nnuru

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

10. EPDM a ɛwɔ hɔ

Sɛ wobɛma rɔba a ɛwɔ nhyɛsoɔ a ɛba fam no ayɛ deformation a ɛtra hɔ daa a, bɔ mmɔden sɛ wobɛkwati sɛ wode EPDM rɔba a ɛwɔ crystallinity kɛseɛ bedi dwuma.

11. NBR

NBR a ɛyɛ emulsion polymerized ne calcium chloride sɛ coagulant no taa wɔ compression set a ɛba fam.

Wɔ NBR rɔba ho no, sɛ wopɛ sɛ wode w’adwene si ne compression permanent deformation adwumayɛ so a, ɛnde bɔ mmɔden sɛ wobɛpaw ahorow a ɛwɔ branching a ɛkorɔn ne nkɔnsɔnkɔnsɔn entanglement kɛse anaa ahorow a acrylonitrile dodow sua.

12. Rɔba a wɔde ethylene-acrylate ayɛ

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

13. Nneɛma a wɔde yɛ homogenizers a egyina resin so

Kwati sɛ wode homogenizers a egyina resin so bedi dwuma wɔ rɔba nnuru mu, efisɛ eyi ma aduru no compression set no yɛ kɛse.

14. Nneɛma a wɔde hyɛ mu

Sɛ wɔtew nneɛma a wɔde hyɛ mu, nhyehyɛe ne nea wɔde ahyɛ mu no ani pɔtee (a ɛma nneɛma nketenkete no kɛse kɔ soro) a, mpɛn pii no ɛbɛtew nhyɛso a wɔahyehyɛ no so. Bere koro no ara mu no, dwumadi a ɛkɔ soro wɔ filler no ani nso betumi ama compression set resistance a ɛwɔ aduru no mu no atu mpɔn.

15. Silica a ɛwɔ hɔ

Silica filler a ɛba fam wɔ aduru no mu no bɛtew compression set no so. Sɛnea ɛbɛyɛ a wobenya compression set a ɛba fam no, ɛho hia sɛ wɔkwati sɛ wɔbɛhyɛ silic ma kɛse. Sɛ dodow a wɔde ahyɛ mu ma no boro afã 25 (sɛnea ne kɛse te a, compressive permanent deformation a ɛwɔ aduru no mu no bɛyɛ kɛse.

16. Silane aduru a wɔde ka bom

Sɛ wosusuw silane coupling agent a wɔde di dwuma wɔ silica a ɛtɔ gu fam dodow a ɛdɔɔso mu a, wobetumi atew compression daa deformation a adhesive no so. Silane coupling agent betumi atew compression daa deformation a silica ahyɛ mu ma rɔba, na nso tew compression daa deformation a silicate type filler te sɛ dɔte, talcum powder ne afoforo ahyɛ rɔba.

17. Nneɛma a wɔde yɛ plastic

Sɛ wɔtew plasticizer dodow a wɔde hyɛ rɔba no mu a, mpɛn pii no ɛbɛtew compression permanent deformation a ɛwɔ rɔba no mu no so.