CN104830066A - Thermal-conductive and flame-retarding silicone rubber slurry used for preparing ultrathin sealing rubber layer and doped with nano zinc oxide and preparation method thereof - Google Patents

Abstract

The invention relates to the field of silicone rubber composite processing and particularly relates to thermal-conductive and flame-retarding silicone rubber slurry used for preparing an ultrathin sealing rubber layer and doped with nano zinc oxide and a preparation method thereof. The silicone rubber slurry is prepared from following raw materials, by weight: 4-8 parts of tactifying resin, 20-25 parts of silicone raw rubber, 20-30 parts of methylbenzene, 1-2 parts of polyamide wax micro powder, 0.2-0.3 parts of dihydroxydiphenylsilane, 4-6 parts of the nano zinc oxide, 6-8 parts of silicone micro powder, 0.1-0.2 parts of a defoaming agent, 0.5-1 part of 2,5-dimethyl-2,5-bis(tert-butyl-peroxyl)hexane, 0.1-0.2 parts of an adhesive 2260, 3-5 parts of a color master batch, 12-15 parts of cyclohexane, 0.1-0.2 parts of an anti-oxidizing agent and 0.2-0.3 parts of vinyltrimethoxylsilane. The silicone rubber slurry is controllable in viscosity, is fine and foam-free, is good in thixotropy and is convenient to use in silk-screen printing. A vulcanized rubber layer can be as low as 0.05 mm in thickness, is high in strength and good in toughness, is excellent in thermal conduction and flame retardant, not only has a durable and high-effective sealing effect but also is safer, can enhance environmental adaptability of a sealing member, and is excellent in sealing effect on oil materials, liquids and such fluids.

Description

Heat conductive flame-retarding silicon rubber cement of a kind of nanometer doped zinc oxide for the preparation of Ultrathin sealed rubber layer and preparation method thereof

Technical field

The present invention relates to silicon rubber Compound Machining field, heat conductive flame-retarding silicon rubber cement being specifically related to a kind of nanometer doped zinc oxide 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, heat conductive flame-retarding silicon rubber cement that a kind of nanometer doped zinc oxide for the preparation of Ultrathin sealed rubber layer is provided and preparation method thereof, this modified silicon rubber rubber cement improves mechanical property and the processing characteristics of traditional silicon rubber, the thin layer rubber heat conductive flame-retarding obtained after sulfuration, sealing property is superior, and security is high; To achieve these goals, the technical solution used in the present invention is as follows:

Heat conductive flame-retarding silicon rubber cement of a kind of nanometer doped zinc oxide 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: tackifying resin 4-8, silica gel rubber 20-25, toluene 20-30, polyamide wax micropowder 1-2, Diphenylsilanediol 0.2-0.3, nano zine oxide 4-6, silicon powder 6-8, defoamer 0.1-0.2, two two or five vulcanizing agent 0.5-1, caking agent 22600.1-0.2, colour batch 3-5, hexanaphthene 12-15, oxidation inhibitor 0.1-0.2, vinyltrimethoxy silane 0.2-0.3,

The preparation method of described silicon rubber cement is:

(1) first silicon powder is mixed with nano zine oxide, mixture is warming up to 600-800 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, tackifying resin are 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) the modified silicon micro mist-nano zine oxide micro-scale filler, adulterated 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, fine and smooth still, 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, thin adhesive layer intensity is high, good toughness, there is good heat conductive flame-retarding effect, not only there is lasting efficient sealing effectiveness, and safer, the environment that improve sealing member is suitable for ability, 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: tackifying resin 6, silica gel rubber 24, toluene 28, polyamide wax micropowder 1.5, Diphenylsilanediol 0.2, nano zine oxide 5, silicon powder 8, defoamer 0.1, two two or five vulcanizing agents 0.8, caking agent 22600.1, colour batch 4, hexanaphthene 14, oxidation inhibitor 0.1, vinyltrimethoxy silane 0.3.

The preparation method of this rubber cement is:

(1) first silicon powder is mixed with nano zine oxide, mixture is warming up to 700-800 DEG C with the temperature rise rate of 5-8 DEG C/min, room temperature is cooled to this understanding after roasting 4.8h, microscale powder must be activated, drop in hexanaphthene after subsequently mixed powder and vinyltrimethoxy silane mixed grinding being disperseed 20min, be uniformly mixed 50min, obtain mixed slurry for subsequent use;

(2) silica gel rubber, tackifying resin are 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)	68
Tensile strength at yield (MPa)	6.5
		Elongation at break (%)	312
100% tensile modulus (MPa)	3.4
		Compression set rate (22h × 175 DEG C)	10.9％
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 (%)	-5.6％
Elongation at break velocity of variation (%)	-9.8％
		Volume change (%)	5.6％

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

Changes in hardness (degree)	4
		Tensile strength at yield velocity of variation (%)	4.5％
Elongation at break velocity of variation (%)	-10.4％

Claims (2)

1. heat conductive flame-retarding silicon rubber cement for the preparation of the nanometer doped zinc oxide 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: tackifying resin 4-8, silica gel rubber 20-25, toluene 20-30, polyamide wax micropowder 1-2, Diphenylsilanediol 0.2-0.3, nano zine oxide 4-6, silicon powder 6-8, defoamer 0.1-0.2, two two or five vulcanizing agent 0.5-1, caking agent 2260 0.1-0.2, colour batch 3-5, hexanaphthene 12-15, oxidation inhibitor 0.1-0.2, vinyltrimethoxy silane 0.2-0.3.

2. the heat conductive flame-retarding silicon rubber cement and preparation method thereof of a kind of nanometer doped zinc oxide for the preparation of Ultrathin sealed rubber layer as claimed in claim 1, its preparation method is:

(1) first silicon powder is mixed with nano zine oxide, mixture is warming up to 600-800 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, tackifying resin are 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.