阅读说明：本技术 一种真空成型用耐高温密封胶条 (High-temperature-resistant sealing rubber strip for vacuum forming ) 是由 屈小红 谷军军 赵娟娟 于 2019-10-29 设计创作，主要内容包括：本发明公开了一种真空成型用耐高温密封胶条,其特征在于采用丁基橡胶、溴化丁基橡胶为基胶,松香树脂和聚异丁烯为增粘剂,碳酸钙、高岭土、滑石粉、硫酸钡等为填料,添加硫化促进剂、防老剂、酚醛树脂硫化剂以及颜料,经开炼机塑炼、捏合机捏合、挤出机挤出成型,形成耐高温密封胶条。本发明不添加增塑剂,因此不存在增塑剂迁移至胶条表面的弊端。此外,本发明在抽真空时可以保证整体不漏气,脱模后无残胶,耐高温性能好,能够耐受230℃的复合材料固化温度。(The invention discloses a high-temperature-resistant sealing rubber strip for vacuum forming, which is characterized in that butyl rubber and brominated butyl rubber are used as base rubber, rosin resin and polyisobutylene are used as tackifiers, calcium carbonate, kaolin, talcum powder, barium sulfate and the like are used as fillers, and a vulcanization accelerator, an anti-aging agent, a phenolic resin vulcanizing agent and a pigment are added, and the high-temperature-resistant sealing rubber strip is formed by plastication in an open mill, kneading in a kneader and extrusion molding in an extruder. The invention does not add plasticizer, so the defect that the plasticizer migrates to the surface of the rubber strip is avoided. In addition, the invention can ensure that the whole body has no air leakage during vacuum pumping, has no adhesive residue after demoulding, has good high temperature resistance and can resist the curing temperature of the composite material of 230 ℃.)

1. A high-temperature resistant sealing rubber strip for vacuum forming is characterized in that butyl rubber and brominated butyl rubber are used as base rubber, rosin resin and polyisobutylene are used as tackifiers, phenolic resin is a high-temperature recessive vulcanizing agent, powder filler, a vulcanization accelerator, an anti-aging agent and pigment are added, plastication is carried out by an open mill, kneading is carried out by a kneading machine, and extrusion molding is carried out by an extruder, wherein the high-temperature resistant sealing rubber strip comprises the following components in parts by weight:

50-80 parts of butyl rubber, 10-30 parts of brominated butyl rubber, 30-50 parts of rosin resin, 70-150 parts of polyisobutylene, 100-300 parts of filler, 6-15 parts of high-temperature vulcanizing agent phenolic resin, 1-5 parts of vulcanization accelerator, 1-2 parts of anti-aging agent and 0-30 parts of pigment.

2. The high-temperature-resistant sealing rubber strip for vacuum forming according to claim 1, wherein: the brominated butyl rubber is one or more than one of 2255 brominated butyl rubber, 2222 brominated butyl rubber, 2030 brominated butyl rubber and 2211 brominated butyl rubber.

3. The high-temperature-resistant sealing rubber strip for vacuum forming according to claim 1, wherein: the phenolic resin is one or more than one of 201 brominated hydroxymethyl tert-octyl phenolic resin, 2, 6-hydroxymethyl-4-chlorophenol resin and p-tert-butylphenol resin.

4. The high-temperature-resistant sealing rubber strip for vacuum forming according to claim 1, wherein: the filler is one or more of nano calcium carbonate, light calcium carbonate, heavy calcium carbonate, kaolin, talcum powder and barium sulfate.

5. The high-temperature-resistant sealing rubber strip for vacuum forming according to claim 1, wherein: the vulcanization accelerator is one or more of zinc oxide, magnesium oxide, dithiocarbamate, thiurams, stannous chloride and ferric chloride.

6. The high-temperature-resistant sealing rubber strip for vacuum forming according to claim 1, wherein: the anti-aging agent is one or more of RD, 4020, MB, NBC, 1010 antioxidant and 168 antioxidant.

7. The high-temperature-resistant sealing rubber strip for vacuum forming according to claim 1, wherein: the pigment is one or more of carbon black, cyanine, iron oxide red, phthalocyanine green and iron oxide yellow.

Technical Field

The invention relates to a sealing rubber strip, in particular to the technical field of a high-temperature-resistant sealing rubber strip for vacuum forming.

Background

Advanced airplanes, missiles, rockets and the like widely adopt resin-based composite materials, the composite materials are formed by adopting vacuum infusion forming, vacuum bag pressing forming and autoclave forming processes at present, and the vacuum forming process has the characteristics of flexibility, simplicity, convenience, high efficiency, excellent quality and the like, so that the resin-based composite materials are widely applied. With the continuous progress of the technology, the matrix resin of the high-performance composite material gradually changes from low-temperature epoxy resin to high-temperature bismaleimide, cyanate ester, polyimide and the like. During vacuum forming, a reliable seal between the vacuum bag film and the mold is required. Therefore, a sealing rubber strip which can effectively seal a vacuum bag, has no residual glue after demolding and can resist high temperature is needed.

In the early vacuum forming process, the vacuum bag film and the mould are bonded and sealed by solvent type adhesive, the method is very inconvenient to operate, needs repeated gluing, has certain pollution to resin materials, and has poor sealing effect. Rubber products are very important in the sealing industry because rubber is an elastic high polymer material, has a wide temperature range, and can generate large deformation under the action of small stress in different media, and the deformation can provide contact pressure to compensate leakage gaps, so that the sealing purpose is achieved. The existing joint strip can have some problems: (1) poor initial viscosity: because the spreading and pasting of the sealing rubber strip are realized manually, the rubber strip with poor initial adhesion can have the phenomena of loose adhesion and even die detachment in the construction process, thereby causing air leakage in the production process; (2) insufficient temperature resistance: the temperature resistance of common butyl rubber products is only about 160 ℃, and the phenomenon of melt flow can occur under the condition that the temperature is higher than 200 ℃. The vacuum forming process is a process of heating and vacuumizing at the same time, so that the sealing rubber strip cannot play any sealing role at ultrahigh temperature; (3) plasticizer migration: in the traditional rubber formula, a plasticizer is added for plastication, and the plasticizer is separated out at high temperature and even possibly migrates to the surface of resin to cause product pollution; (4) vulcanization speed: the saturation degree of the butyl rubber and the brominated butyl rubber is higher, and the vulcanization speed is lower, so that the reaction temperature is increased, but the rubber strip is deformed because of not being vulcanized, so that the air tightness is influenced; (5) cleanability of demold: in order to facilitate the subsequent second construction, many production units require that the demolding is convenient for the sealing rubber strip, and the residual on the mold after the sealing rubber strip is used is not allowed, which is also a defect in the prior art.

Disclosure of Invention

The invention aims at the defects of the existing research and the requirements of practical application, and provides a high-temperature-resistant and high-viscosity sealing rubber strip for vacuum forming, which has the advantages of high vulcanization speed, good sealing performance, no plasticizer pollution, highest temperature resistance of 230 ℃ and no residual glue after demoulding.

The invention is realized by the following technical scheme:

the technical scheme of the invention provides a high-temperature-resistant sealing rubber strip for vacuum forming, which is characterized in that the high-temperature-resistant sealing rubber strip is formed by plasticating the following raw materials in an open mill, kneading in a kneading machine and extruding in an extruder:

50-80 parts of butyl rubber;

10-30 parts of brominated butyl rubber;

30-50 parts of rosin resin;

70-150 parts of polyisobutylene by weight;

100-300 parts of filler;

1-5 parts of vulcanization accelerator;

6-15 parts of high-temperature vulcanized phenolic resin;

1-2 parts of an anti-aging agent;

0-30 parts of pigment.

The brominated butyl rubber is one or more than one of 2255 brominated butyl rubber, 2222 brominated butyl rubber, 2030 brominated butyl rubber and 2211 brominated butyl rubber.

The high-temperature vulcanized phenolic resin is one or more than one of 201 brominated hydroxymethyl tert-octyl phenolic resin, 2, 6-hydroxymethyl-4-chlorophenol resin and p-tert-butylphenol resin.

The vulcanization accelerator is one or more of zinc oxide, magnesium oxide, dithiocarbamate, thiurams, stannous chloride and ferric chloride.

The filler is one or more of nano calcium carbonate, light calcium carbonate, heavy calcium carbonate, kaolin, talcum powder and barium sulfate.

The anti-aging agent is one or more of RD, 4020, MB, NBC, 1010 antioxidant and 168 antioxidant.

The pigment is one or more of carbon black, cyanine, iron oxide red, phthalocyanine green and iron oxide yellow.

Compared with the prior art, the technical scheme of the invention has the following advantages:

1. brominated butyl rubber is adopted as high-activity base rubber and is matched with a phenolic resin high-temperature recessive vulcanizing agent, the sealing rubber strip has excellent high-temperature resistance, and the highest service temperature reaches 230 ℃;

2. brominated butyl rubber is used as a high-activity base material and is matched with a phenolic resin high-temperature recessive vulcanizing agent, so that the sealing rubber strip has good elasticity;

3. no plasticizer is added in the formula, so that the risk of plasticizer migration is avoided;

4. through the technological processes of plastication by an open mill, kneading by a kneader and extrusion by an extruder, the components are uniformly distributed, the energy consumption is lower, and the product performance is stable;

5. the vulcanization accelerator is added in the formula, so that the vulcanization speed is accelerated, and the material is not easy to deform in the vacuum forming process;

6. the anti-aging agent is added, so that the heat-oxygen aging resistance at high temperature is enhanced;

7. the sealing rubber strip has the characteristics of low cost and environmental friendliness by adopting calcium carbonate, kaolin, talcum powder and barium sulfate as fillers.

Detailed Description

The technical solution of the present invention will be further described with reference to the following examples:

example 1:

60 parts of butyl rubber, 20 parts of brominated butyl rubber, 50 parts of rosin resin, 100 parts of polyisobutylene, 180 parts of light calcium carbonate, 20 parts of kaolin, 20 parts of talcum powder, 6 parts of 201 brominated hydroxymethyl tert-octyl phenolic resin, 2 parts of zinc oxide, 1 part of RD anti-aging agent and 1 part of phthalocyanine green.

The preparation method comprises the steps of plasticating the components by an open mill, kneading by a kneader and extruding and molding by an extruder.

Example 2:

70 parts of butyl rubber, 10 parts of brominated butyl rubber, 30 parts of rosin resin, 120 parts of polyisobutylene, 150 parts of heavy calcium carbonate, 50 parts of kaolin, 50 parts of talcum powder, 15 parts of 2, 6-dimethyl-4-chlorophenol resin, 2 parts of stannous chloride, 2 parts of NBC (N-bromodiphenyl-trichloroethane) anti-aging agent and 30 parts of iron oxide red.

The preparation method comprises the steps of plasticating the components by an open mill, kneading by a kneader and extruding and molding by an extruder.

Example 3:

50 parts of butyl rubber, 30 parts of brominated butyl rubber, 30 parts of rosin resin, 120 parts of polyisobutylene, 180 parts of nano calcium carbonate, 30 parts of kaolin, 20 parts of barium sulfate, 10 parts of 201 brominated hydroxymethyl tert-octyl phenolic resin, 5 parts of ferric chloride, 5 parts of 1010 antioxidant and 5 parts of carbon black.

The preparation method comprises the steps of plasticating the components by an open mill, kneading by a kneader and extruding and molding by an extruder.

Example 4:

70 parts of butyl rubber, 10 parts of brominated butyl rubber, 50 parts of rosin resin, 120 parts of polyisobutylene, 150 parts of light calcium carbonate, 20 parts of talcum powder, 6 parts of 201 brominated hydroxymethyl tert-octyl phenolic resin, 2 parts of thiuram, 2 parts of 168 antioxidant and 15 parts of iron oxide yellow.

The preparation method comprises the steps of plasticating the components by an open mill, kneading by a kneader and extruding and molding by an extruder.

Example 5:

60 parts of butyl rubber, 20 parts of brominated butyl rubber, 50 parts of rosin resin, 150 parts of polyisobutylene, 180 parts of heavy calcium carbonate, 20 parts of kaolin, 20 parts of talcum powder, 10 parts of p-tert-butyl phenolic resin, 1 part of dithiocarbamate, 2 parts of 4020 anti-aging agent and 5 parts of cyanine.

The preparation method comprises the steps of plasticating the components by an open mill, kneading by a kneader and extruding and molding by an extruder.

Table 1 shows the performance of the high temperature resistant low tack vacuum bag sealant strip. The high temperature resistance and release properties of the examples were reflected, with the maximum service temperature being the highest temperature capable of withstanding 10h hot air ageing.