30results about How to "Vulcanization rate is slow" patented technology

Materials crosslinkable at room temperature by condensation, based on organosilicon compounds which cure to give permanently resilient materials, are catalyzed by a compound of the main or subgroups I and II in conjunction with an inorganic acid as a catalyst.

Materials crosslinkable at room temperature by condensation are based on organosilicon compounds which cure to give permanently resilient materials, and which employ one or more compounds of the metals Li, Na, K, Mg, Ca, or Sr as catalyst.

Disclosed is a rubber composition containing (A) a natural rubber, a diene synthetic rubber or a combination of them and (B) 50-120 parts by weight of a silicic acid-based or silicate-based inorganic filler per 100 parts by weight of the component (A). This rubber composition is characterized by further containing (C) 0.2-20 parts by weight of a certain amine salt per 100 parts by weight of the component (A).

The invention provides a preparation method of a two-component condensed type room temperature vulcanized silicone rubber curing agent. The curing agent is prepared by reacting tetraethoxysilane and dibutyltin dilaurate under the catalysis of macroreticular strong-acid cation exchange resin. The curing agent prepared by the method has the advantages of good stability and proper heavy metal content, and the method is simple to operate.

Disclosed are a polypropylene composition toughened by high-rigidity thermoplastic vulcanizate (TPV) and a preparation method thereof. Disclosed is the polypropylene composition toughened by high-rigidity TPV comprising: (1) 100% of polypropylene, (2) 1.5-2.0% of a compound cross-linking agent system, and (3) 10-30% of EPDM / PP-type TPV. The composition is processed through dynamic vulcanization. The compound cross-linking agent system comprises: 0.8-1.0% of compound organic peroxide, 0.5-0.7% of bromine and 0.5-1.0% of an acrylic acid ester auxiliary cross-linking agent. The compound organic peroxide consists of two kinds of organic peroxide with different half life characteristics, that is organic peroxide a and organic peroxide b. The half life of the organic peroxide a (Ta) is more than 180 DEG C / 1 min and less than 230 DEG C / 1 min, while the half life of the organic peroxide b (Tb) is more than 250 DEG C / 1 min. The mass ratio between the organic peroxide a and the organic peroxide b is in a range of 1:5 to 1:10. According to the invention, toughness of said resin is significantly improved and rigidity of the resin is well maintained, and thus the resin is suitable for a very wide range of fields. The invention further discloses the preparation method of the polypropylene composition.

The invention discloses an ice-surface oil-resistant anti-skid shoe material and a preparation method thereof, and relates to the technical field of shoe materials. The raw materials include butyl rubber; butadiene rubber; nitrile rubber; dissolved polystyrene butadiene rubber; white smoke; zinc oxide ; Antiaging agent; Plasticizer; Silane coupling agent; Vulcanization accelerator. The shoe material prepared by this formula is integrated with the specific pattern of the outsole, or is pasted on the outsole. The obtained shoe sole has the advantages of oil resistance and anti-skid, good mechanical properties, and no return of fog. Excellent anti-skid performance, suitable for use on ice and snow.

The invention discloses a preparation method of colored tire tread rubber highly filled with environmentally friendly and high-strength tire reclaimed rubber, wherein the amount of environmentally friendly and high-strength tire reclaimed rubber is 40-55 parts; the preparation method is as follows: firstly, an open mill or The internal mixer plasticizes NR and BR respectively, and then combines the plasticized rubbers of NR and BR for compaction, and adds reclaimed rubber to make the rubber material uniform; add vulcanization accelerator and triethanolamine to the above rubber materials and mix evenly, and then Add white carbon black, pine tar, and finally add sulfur, roll and triangular bag, until the various materials are evenly dispersed with each other, the plasticizing and mixing time is about 25-30min, and then perform performance testing according to GB / T1702-1997, pull The tensile strength is 16.54 MPa, and the elongation at break is 569.9%, which can better meet the needs of the mechanical properties of tire tread rubber; improve tire performance, reduce pollution, and reduce the cost of tires by 10‑30%.

The invention belongs to the technical field of graphene rubber composite materials, and proposes a graphene modified nitrile rubber and a preparation method thereof. A graphene-modified nitrile rubber, comprising the following components by weight: 70-90 parts of nitrile rubber, 10-30 parts of modified graphene oxide carboxylated nitrile-butadiene rubber masterbatch, 1.5-2 parts of vulcanizing agent, 0.5-2.0 parts of vulcanization accelerator, 3-5 parts of vulcanization activator, 1-3 parts of plasticizer, 1-2 parts of anti-aging agent, 20-30 parts of filler, modified graphene oxide-carboxylated nitrile rubber masterbatch includes The modified graphene oxide also includes carboxylated nitrile latex, wherein the modified graphene oxide is obtained by dehydrating and condensing graphene oxide after hydrolysis of mercaptosiloxane. Through the above technical scheme, the problem of poor high and low temperature resistance of nitrile rubber in the prior art is solved.