CN104774467A - Silicone rubber cement with high airtight property for preparing ultrathin sealing rubber layers and preparation method thereof - Google Patents

Abstract

The invention relates to the field of silicone rubber composite processing, and specifically relates to a silicone rubber cement with a high airtight property for preparing ultrathin sealing rubber layers, and a preparation method thereof. The silicon rubber cement is composed of the following raw materials in parts by weight: 4 to 6 parts of polyisobutylene, 15 to 18 parts of cyclohexane, 1 to 2 parts of maleic anhydride, 25 to 30 parts of raw silica gel, 30 to 40 parts of toluene, 2 to 3 parts of ultrafine pyrophyllite powder, 5 to 8 parts of nano alumina, 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, 4 to 6 parts of color master batch, 0.1 to 0.2 part of antioxidant, and 0.2 to 0.3 part of amino silane coupling agent. The properties of the conventional silicone rubber are modified, and the provided silicone rubber cement is stable and thus is convenient for screen printing. After vulcanization, the thickness of the rubber layer can reach 0.05 mm, the strength and roughness of the rubber layer are both very good, the rubber layer can be re-processed, the sealing effect is efficient and long-lasting, the airtight property is especially good, and the rubber layer has an excellent sealing effect on fluids such as gas, oil, fluid, and the like.

Description

A kind of high-air-tightness 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 high-air-tightness 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, prepare a kind of high-air-tightness silicon rubber cement for the preparation of Ultrathin sealed rubber layer and preparation method thereof, improve processing characteristics and the mechanical property of traditional silicon rubber, possess excellent stopping property; To achieve these goals, the technical solution used in the present invention is as follows:

A kind of high-air-tightness 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: polyisobutene 4-6, hexanaphthene 15-18, maleic anhydride 1-2, silica gel rubber 25-30, toluene 30-40, ultra-fine pyrophyllite powder 2-3, nano aluminium oxide 5-8, defoamer 0.1-0.2, two two or five vulcanizing agent 0.5-1, caking agent 2260 0.1-0.2, colour batch 4-6, oxidation inhibitor 0.1-0.2, amino silicane coupling agent 0.2-0.3;

The preparation method of described silicon rubber cement is:

(1) first ultra-fine pyrophyllite powder is mixed with nano aluminium oxide, mixture is warming up to 600-700 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, subsequently mixed powder and maleic anhydride, amino silicane coupling agent mixed grinding are dropped in hexanaphthene after disperseing 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) agalmatolite-nano aluminium oxide micro-scale filler of the surface grafting maleic anhydride, adulterated in rubber cement, activation homogenate is formed in advance in hexanaphthene, improve the reactive behavior between raw material, ultimately improve silicon rubber use properties, obtained rubber cement moderate viscosity, uniform color is fine and smooth, and 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, any surface finish, has good intensity and toughness concurrently, and air-tightness is especially good, OTR oxygen transmission rate reduces by 350% compared with the traditional silicon rubber layer of stack pile, has excellent sealing function to fluids such as gas, oil plant, liquid.

Embodiment

Embodiment

The rubber cement of the present embodiment is made up of the raw material of following weight part: polyisobutene 5, hexanaphthene 16, maleic anhydride 1.5, silica gel rubber 28, toluene 35, ultra-fine pyrophyllite powder 2, nano aluminium oxide 7, defoamer 0.1, two two or five vulcanizing agents 0.8, caking agent 2,260 0.1, colour batch 5, oxidation inhibitor 0.1, amino silicane coupling agent 0.2.

The preparation method of this silicon rubber cement is:

(1) first ultra-fine pyrophyllite powder is mixed with nano aluminium oxide, mixture is warming up to 600-700 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, subsequently mixed powder and maleic anhydride, amino silicane coupling agent mixed grinding are dropped in hexanaphthene after disperseing 25min, 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 30min, 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)	65
Tensile strength at yield (MPa)	7.8
		Elongation at break (%)	325
100% tensile modulus (MPa)	2.4
		Compression set rate (22h × 175 DEG C)	12.3％
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 (%)	-4.25％
Elongation at break velocity of variation (%)	-10.3％
		Volume change (%)	5.2％

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

Changes in hardness (degree)	5
		Tensile strength at yield velocity of variation (%)	2.48％
Elongation at break velocity of variation (%)	-8.92％

Claims (2)

1. high-air-tightness 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: polyisobutene 4-6, hexanaphthene 15-18, maleic anhydride 1-2, silica gel rubber 25-30, toluene 30-40, ultra-fine pyrophyllite powder 2-3, nano aluminium oxide 5-8, defoamer 0.1-0.2, two two or five vulcanizing agent 0.5-1, caking agent 2260 0.1-0.2, colour batch 4-6, oxidation inhibitor 0.1-0.2, amino silicane coupling agent 0.2-0.3.

2. a kind of high-air-tightness silicon rubber cement for the preparation of Ultrathin sealed rubber layer and preparation method thereof as claimed in claim 1, it is characterized in that, the preparation method of described silicon rubber cement is:

(1) first ultra-fine pyrophyllite powder is mixed with nano aluminium oxide, mixture is warming up to 600-700 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, subsequently mixed powder and maleic anhydride, amino silicane coupling agent mixed grinding are dropped in hexanaphthene after disperseing 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.