CN104774463A - Nano silicon carbide doped wear-resistant silicone rubber cement for preparing ultrathin sealing rubber layer and preparation method thereof - Google Patents

Abstract

The invention relates to the field of silicone rubber combined processing, and specifically relates to a nano silicon carbide doped wear-resistant silicone rubber cement for preparing ultrathin sealing rubber layer and a preparation method thereof. The silicone rubber cement is composed of the following raw materials in parts by weight: 23 to 26 parts of raw silicone rubber, 1 to 2 parts of ammonium polyphosphate, 20 to 30 parts of toluene, 2 to 3 parts of nano silicon carbide, 2 to 3 parts of 1,2-propanediol carbonate, 0.1 to 0.2 part of antifoaming agent, 0.5 to 1 part of 2,5-dimethyl-2,5-di(tert-butylperoxy)hexane, 0.1 to 0.2 part of adhesive 2260, 12 to 16 parts of cyclohexane, 10 to 12 parts of talcum powder, 3 to 5 parts of color master batch, 0.1 to 0.2 part of antioxidant, and 0.2 to 0.3 part of vinyl trimethoxy silane. The viscosity of the silicone rubber cement is controllable, the cement is fine and uniform, the thixotropy is good, the cement is suitable for screen printing, after sulfurization, the thickness of the rubber layer can be as thin as 0.05 mm, and the rubber layer has the advantages of high strength, wear resistance, heat resistance, safety, and good size stability, does not fail easily, and has good sealing effect on fluids such as oil, liquid, and the like.

Description

A kind of dopen Nano silicon carbide wear-resistant type silicon rubber cement for the preparation of Ultrathin sealed rubber layer and preparation method thereof

Technical field

The present invention relates to silicon rubber Compound Machining field, be specifically related to a kind of dopen Nano silicon carbide wear-resistant type silicon rubber cement for the preparation of Ultrathin sealed rubber layer and preparation method thereof.

Background technology

Ultra-thin rubber layer packing technique refers to that one is produced on the sealing member production technology of the upper ultra-thin rubber bodies of sulfuration of skeleton (metal sheet etc.).This product surface has very thin, the rubber layer of bonding by Vulcanization, sealed muscle is made on the surface of this layer of vulcanized rubber or edge, make it to oil plant, the fluids such as liquid produce sealing function, ultra-thin rubber layer wherein assembles fastening reliability and has more advantage than traditional part, fastening better reliability is assembled under equal moment of torsion, failure conditions reduces, effectively alleviate the weight of overall spare and accessory parts, than traditional sealing member, there is apparent advantage, and the ultra-thin rubber layer developing excellent property becomes the vital link of this ultra-thin rubber layer packing technique use properties kind of guarantee.

Silicon rubber has the advantages such as Nai Gaore, cold-resistant, good toughness, environmental protection and is widely adopted in the seal, but confirm through experimental result repeatedly, when preparing ultra-thin silicon glue-line, common solid silicone has following shortcoming: (1) premolding silica gel part is difficult to control, pendulum glue difficulty, production efficiency is low, be unfavorable for batch productization, the product layer of silica gel thickness that (2) are made exceeds, and can not reach design requirements; Liquid silica gel is used also to have following shortcoming: (1) liquid silica gel is made up of body and two, solidifying agent, can mix before using, need use within the regular hour, not so can solidify and lose use value, (2) ultra-thin rubber seal technology needs to make sealed muscle on rubber layer, and just can not it be machined after it has solidified, do not reach design requirements, (3) low strength of liquid silica gel, it weakens the sealing function of the fluid such as oil plant, liquid.Therefore, in order to the silastic-layer of the excellent ultrathin of processability, need to need on from raw material to technique to make further improvement.

Summary of the invention

The object of the invention is to, a kind of dopen Nano silicon carbide wear-resistant type silicon rubber cement for the preparation of Ultrathin sealed rubber layer and preparation method thereof is provided, this modified silicon rubber rubber cement improves mechanical property and the processing characteristics of traditional silicon rubber, the superthin layer rubber wear-resisting obtained after sulfuration damages, durable in use, sealing effectiveness stability and high efficiency; To achieve these goals, the technical solution used in the present invention is as follows:

A kind of dopen Nano silicon carbide wear-resistant type silicon rubber cement for the preparation of Ultrathin sealed rubber layer and preparation method thereof, it is characterized in that, described silicon rubber cement is made up of the raw material of following weight part: silica gel rubber 23-26, ammonium polyphosphate 1-2, toluene 20-30, nanometer silicon carbide 2-3,1,2-PD carbonic ether 2-3, defoamer 0.1-0.2, two two or five vulcanizing agent 0.5-1, caking agent 22600.1-0.2, hexanaphthene 12-16, talcum powder 10-12, colour batch 3-5, oxidation inhibitor 0.1-0.2, vinyltrimethoxy silane 0.2-0.3;

The preparation method of described silicon rubber cement is:

(1) first talcum powder is mixed with nanometer silicon carbide, mixture is warming up to 500-600 DEG C with the temperature rise rate of 5-8 DEG C/min, room temperature is cooled to this understanding after roasting 4-5h, microscale powder must be activated, drop in hexanaphthene after subsequently mixed powder and vinyltrimethoxy silane mixed grinding being disperseed 20-30min, be uniformly mixed 50-60min, obtain mixed slurry for subsequent use;

(2) silica gel rubber is dropped in toluene solution, be stirred to after it dissolves completely, add step (1) gained mixed slurry, after continuing to be uniformly mixed 30-40min, add other leftover materials, be stirred to material and mix completely and get final product.

The modified silicon rubber rubber cement that the present invention prepares possesses following advantage:

(1) talcum powder-nanometer silicon carbide micro-scale filler of the modification of, adulterating in rubber cement, activation homogenate is formed in advance in hexanaphthene, improve the consistency between raw material and reactive behavior, improve silicon rubber use properties efficiently, obtained rubber cement viscosity is controlled, uniform and smooth, thixotropy is good, and the mode of silk screen printing can be adopted to realize mass production.

(2), rubber cement retention period is long, can not lose use value because of solidification, and silk-screen remains silica gel and can collect and reuse, and material use efficiency is high.

(3) do not affect sulfidation after, by modes such as bakings making the organic solvent volatilizations such as toluene, can reprocess.

(4), after sulfuration layer of silica gel thickness can be low to moderate 0.05mm, and glue-line intensity is high, wear-resistant, heat-resisting safety, and good stability of the dimension not easily lost efficacy, and has excellent sealing function to the fluid such as oil plant, liquid.

Embodiment

Embodiment

The rubber cement of the present embodiment is made up of the raw material of following weight part: silica gel rubber 25, ammonium polyphosphate 1.5, toluene 28, nanometer silicon carbide 2.5,1,2-PD carbonic ether 2.4, defoamer 0.1, two two or five vulcanizing agents 0.8, caking agent 22600.1, hexanaphthene 15, talcum powder 11, colour batch 4, oxidation inhibitor 0.1, vinyltrimethoxy silane 0.3.

The preparation method of this rubber cement is:

(1) first talcum powder is mixed with nanometer silicon carbide, mixture is warming up to 500-600 DEG C with the temperature rise rate of 5-8 DEG C/min, room temperature is cooled to this understanding after roasting 4h, microscale powder must be activated, drop in hexanaphthene after subsequently mixed powder and vinyltrimethoxy silane mixed grinding being disperseed 30min, be uniformly mixed 55min, obtain mixed slurry for subsequent use;

(2) silica gel rubber is dropped in toluene solution, be stirred to after it dissolves completely, add step (1) gained mixed slurry, after continuing to be uniformly mixed 40min, add other leftover materials, be stirred to material and mix completely and get final product.

The performance test results of the thick rubber layer of 0.05mm that the rubber cement obtained by the present embodiment is formed is:

Test item	Detected result
		Shore hardness (degree)	69
Tensile strength at yield (MPa)	7.5
		Elongation at break (%)	310
100% tensile modulus (MPa)	2.5
		Compression set rate (22h × 175 DEG C)	10.6％
Low-temperature test (-25 DEG C × 3min)	Without damaged

Oil resistant test (resistance to 903 tests, 150 DEG C × 70h):

Changes in hardness (degree)	-3
		Tensile strength at yield velocity of variation (%)	-4.5％
Elongation at break velocity of variation (%)	-9.7％
		Volume change (%)	6.2％

Hot air burn-in test (175 DEG C × 168h):

Changes in hardness (degree)	4
		Tensile strength at yield velocity of variation (%)	3.4％
Elongation at break velocity of variation (%)	-8.5％

Claims (2)

1. dopen Nano silicon carbide wear-resistant type silicon rubber cement for the preparation of Ultrathin sealed rubber layer and preparation method thereof, it is characterized in that, described silicon rubber cement is made up of the raw material of following weight part: silica gel rubber 23-26, ammonium polyphosphate 1-2, toluene 20-30, nanometer silicon carbide 2-3,1,2-PD carbonic ether 2-3, defoamer 0.1-0.2, two two or five vulcanizing agent 0.5-1, caking agent 2260 0.1-0.2, hexanaphthene 12-16, talcum powder 10-12, colour batch 3-5, oxidation inhibitor 0.1-0.2, vinyltrimethoxy silane 0.2-0.3.

2. a kind of dopen Nano silicon carbide wear-resistant type silicon rubber cement for the preparation of Ultrathin sealed rubber layer and preparation method thereof as claimed in claim 1, its preparation method is:

(1) first talcum powder is mixed with nanometer silicon carbide, mixture is warming up to 500-600 DEG C with the temperature rise rate of 5-8 DEG C/min, room temperature is cooled to this understanding after roasting 4-5h, microscale powder must be activated, drop in hexanaphthene after subsequently mixed powder and vinyltrimethoxy silane mixed grinding being disperseed 20-30min, be uniformly mixed 50-60min, obtain mixed slurry for subsequent use;

(2) silica gel rubber is dropped in toluene solution, be stirred to after it dissolves completely, add step (1) gained mixed slurry, after continuing to be uniformly mixed 30-40min, add other leftover materials, be stirred to material and mix completely and get final product.