Gel fraction hian silicone pressure-sensitive adhesive coated on-a crosslinked network mass percentage a kawk a ni Teflon high-temperature tape , solvent tha (toluene ang chi)-a inthiar theih loh. Measurement procedure-ah hian adhesive film thianghlim chu filter mesh-ah khuh a, Soxhlet extractor-ah darkar 24 chhung lakchhuah a ni a, chu chu chhut hmain a insoluble residue chu constant weight-ah dry a ni.
2. Inpumkhatna chakna: 1.1.
Teflon tape-ah chuan cohesive strength hi temperature sang taka holding power (shear adhesion failure temperature emaw shear holding time emaw) a ni. Test hi a tlangpuiin 180 °C-ah kg 1 load hnuaiah tih a ni a, adhesive layer a slip emaw a chhiat emaw thlenga hun hman dan record a ni. He value hian adhesive layer-in flow leh splitting a do theihna chu direct-in a tarlang a ni.
II. Gel Fraction leh Cohesive Strength inkara Quantitative Correspondence a awm
1. Critical point hnuai lamah (gel fraction < 60%):
System hian percolating network a la siam lo a; adhesive layer chu viscous-flow state-ah a awm reng a, holding power chu zero hnaih a ni a, practical cohesive strength a awm lo.
2. Practical range (60%-85%): a ni.
Critical point kaltlangin, effective elastic chain density chu gel fraction nen nasa takin a pung a, cohesive strength chu exponential-in emaw, high-power law zawm emaw-in a pung bawk. Gel fraction 60% atanga 70% a tihpun chuan high-temperature holding time chu minute atanga darkar thlengin a tisang thei a; 70% atanga 80% thlenga holding power chu a let 3 atanga 10 velin a pung belh thei bawk. Failure mode hi extensive cohesive failure atanga mixed failure ah a inthlak zauh zauh thin.
3. Crosslinking range sang tak (> 85%): 1.1.
Cohesive strength tihpunna chu a slow hle. Gel fraction 85% atanga 95% a tihsan chuan holding time chu 20%–50% chauhin a tipung a, mahse tack (initial adhesion) erawh chu molecular chain mobility tihkhawtlai vangin nasa takin a tlahniam thung. Gel fraction 95% aia tam a nih chuan adhesive layer chuan pure elastomer state a hnaih a, pressure-sensitive adhesive property te chu a bul berah chuan a bo ta a ni.
III. Semi-Empirical Model leh Typical Data te a ni
Jiangsu Teflon high-temperature fabric siamtute’n an sawifiah angin, shear holding time (t_shear) leh gel fraction (g) inkara empirical relationship chu hetiang hian sawi theih a ni:
lg(t_shear) = A + B · g (B chu 0.1–0.2 vel nen), exponential dependence a nih thu a tarlang. A leh B value hi MQ resin ratio, adhesive layer thickness, leh test temperature-ah a innghat a ni.
Data inmil tlangpui (180 °C static shear, 65% gel fraction-a holding time 1-a normalized):
| Gel Fraction a awm | Relative Holding Hun Hmanlai | Hlawhchhamna Mode |
|
| 55% a ni | < 0.1 a ni | 100% inpumkhatna hlawhchhamna |
| 65% a ni | 1 | ~80% inzawmkhawm hlawhchhamna |
| 75% a ni | 8–15 inkarah | Mixed hlawhchhamna |
| 85% a ni | 50–100 inkar | A la awm tlem |
| 92% a ni | 150–200 (saturation hnaih) | Pure interfacial a hlawhchham |
60%–90% range-ah chuan gel fraction percentage-point 5-a a san apiangin high-temperature cohesive strength chu a let tam takin a tipung thei tih a chiang hle.
IV. Teflon Tape siamna kawnga Control Strategies te
1. Target gel fraction range: 1. A rilru a hah lutuk chuan a rilru a buai em em a.
Jiangsu Teflon high-temperature fabric siamtute atanga general-purpose heat-resistant winding tapes tan chuan gel fraction rawt chu 75%–85% a ni a, tack leh cohesion a balance a ni. High-temperature anti-stick conveyor belt (200–260 °C-a hun rei tak load theih) tan chuan adhesive layer-a cohesive splitting avanga adhesive residue lo awm tur ven nan gel fraction chu 85%–93% thleng a ni tur a ni.
2. Interface matching mamawh dan: 1.1.
Teflon high-temperature tape PTFE surface hian surface energy a nei tlem hle a; chuvangin, adhesive layer-a cohesive strength chu interfacial adhesion strength aiin a sang zawk tur a ni; chutiang a nih loh chuan stress hnuaiah cohesive failure a awm ang. Gel fraction 93% aia tam a nih chuan adhesive layer chu a nghet lo va, wetting leh PTFE substrate nena inmil theihna a ti tlem a, hei hian edge lifting a thlen thei a ni. Production-ah chuan gel fraction chu target range chhunga lock turin crosslinking temperature, time leh catalyst dosage dik taka control a pawimawh a, chu chuan cohesive failure atanga interfacial failure-a inthlak danglamna rintlak tak a siam thei a ni.
Kan thil siam zawng zawng—Teflon high-temperature fabrics, Teflon high-temperature tapes, Teflon high-temperature mesh belts, laminators atana adhesive-free seamless belts, single-sided PTFE fabrics, high-temperature conveyor te pawh a tel, a specification kimchang, application scenario, leh customization option te hriat belh i duh chuan belt, fiberglass puan lumna sang tak, leh thil dang tam tak—a hnuaia mi hmang hian min rawn biak theih reng e:
