High-bonding-strength hot melting type rubber-based composite material and preparation method thereof

Abstract

The invention discloses a high-bonding-strength hot melting type rubber-based composite material and a preparation method thereof, and relates to the technical field of protective material preparation, the high-bonding-strength hot melting type rubber-based composite material comprises a base cloth layer, a rubber layer and a hot melting layer, the rubber layer is arranged on at least one surface of the base cloth layer and comprises a fluororubber layer or a brominated butyl rubber layer, and the hot melting layer is compounded on the outer surface of the rubber layer. The preparation method comprises the following steps: uniformly mixing the raw materials of the rubber layer and dissolving in a solvent to prepare rubber cement; coating a base cloth layer with the adhesive cement; after the solvent is volatilized, vulcanizing to prepare a vulcanized rubber tape; the hot melting layer thin film is attached to the surface of the rubber layer of the vulcanized rubber tape through dispensing attachment, and the protective clothing fabric is prepared.

Description

Technical Field

[0001] This invention relates to the field of protective material preparation technology, specifically to a high-adhesion-strength hot-melt rubber-based composite material and its preparation method. Background Technology

[0002] Currently, protective clothing fabrics are mainly made of polymer resins or rubber composites. Among them, polymer resins, due to their thermoplasticity, can be processed and shaped through hot-melt bonding, resulting in a smooth and intact appearance and high seam reliability. However, after rubber materials are vulcanized, the surface cross-links and solidifies, forming a cross-linked network structure, which no longer has the ability to be hot-melted and bonded. The seams can only be formed by cold bonding with adhesives. Although resin-based adhesives have high bonding strength, the seams become stiff after curing, which seriously affects the overall feel and wearing comfort of the clothing. On the other hand, rubber-based adhesives are limited by the fact that the cross-linking density between interfaces is lower than that of the main material, resulting in poor protective performance at the bonding points, which cannot reach the protective level of the main material, becoming a weak link in the protective system.

[0003] To address this issue, existing technologies employ rubber-plastic blends to balance thermoforming and rubber properties. However, these blends require a plastic content of at least 60% to achieve thermoforming capability, which severely compromises the material's low-temperature resistance and significantly limits its application.

[0004] Therefore, there is an urgent need to develop a novel composite material that retains the excellent protective properties of rubber while possessing efficient and reliable thermal bonding capabilities. Based on this, this application proposes a high-bonding-strength thermally bondable rubber-based composite material and its preparation method. Summary of the Invention

[0005] To address the shortcomings of current protective materials, such as the insufficient performance of polymer resins that can be heat-fused, and the inability of rubber materials to be heat-fused after vulcanization, which necessitates cold bonding techniques resulting in stiff, poor-feeling, or weakly protective joints, as well as the poor low-temperature resistance of rubber-plastic blends used to improve processability, this invention provides a high-bonding-strength heat-fused rubber-based composite material and its preparation method.

[0006] This invention is achieved using the following techniques: This invention provides a high-bonding-strength hot-melt rubber-based composite material, comprising a base fabric layer, a rubber layer, and a hot-melt layer; A rubber layer is disposed on at least one surface of the base fabric layer, the base fabric layer being made of polyester-cotton blend, aramid, or nylon, and the rubber layer comprising a first rubber layer and / or a second rubber layer, wherein the first rubber layer is a fluororubber layer and the second rubber layer is a brominated butyl rubber layer; The hot melt layer is laminated to the outer surface of the rubber layer. The material of the hot melt layer is polyurethane, polyethylene or polyvinyl chloride, and the thickness is 0.1 mm.

[0007] Furthermore, the components of the fluororubber layer, in parts by weight, include: Fluororubber: 100 parts; Bisphenol AF: 1.5–3 parts; Accelerator BPP: 0.1-1 part; Magnesium oxide: 0.5–3 parts; Calcium hydroxide: 2-6 parts; Calcium oxide: 0.5–3 parts; Triazine vulcanizing agent (TCY): 0.5–3 parts; HVA-2: 0.5 to 1.5 parts.

[0008] The components of the brominated butyl rubber layer, by weight, include: Brominated butyl rubber: 100 parts; BIBP: 0.5–1.5 parts; Triazine vulcanizing agent (TCY): 0.5–3 parts; HVA-2: 0.5–1.5 parts; Zinc oxide: 0.5–1.5 parts; Stearic acid: 0.5–1.5 parts; Magnesium oxide: 0.5 to 1 part.

[0009] The rubber layer also includes lightfast yellow: 0 to 5 parts, excluding 0 parts.

[0010] This invention provides a method for preparing a high-bonding-strength, heat-fused rubber-based composite material, comprising the following steps: a. Mix the raw materials of the rubber layer evenly to obtain a compound, and dissolve the compound in a solvent to obtain a paste; when the paste is brominated butyl rubber and the solvent is gasoline, the weight ratio of paste to solvent is 1:2; when the paste is fluororubber and the solvent is ethyl acetate, the weight ratio of paste to solvent is 1:4.

[0011] b. Apply the adhesive to the base fabric layer to form a rubber layer; Specifically, the following steps are included: A 1.5-meter wide polyester-cotton fabric is selected as the base layer. Fluororubber adhesive is first coated on one side of the base layer, with an adhesive application rate of 100~120g / m. 2 After applying a release agent (such as talc or corn starch), flip the fabric over. Then, coat the other side of the base fabric with brominated butyl rubber adhesive at a rate of 100-120 g / m². 2 .

[0012] Alternatively, fluororubber adhesive can be applied to both sides, or brominated butyl rubber adhesive can be applied to both sides.

[0013] c. After the solvent evaporates, vulcanization is carried out to obtain vulcanized rubber cloth; the vulcanization conditions are 145℃×1.5h and the pressure is 0.35~0.45MPa.

[0014] d. The material of the hot melt layer is made into a thin film, which is then bonded to the surface of the rubber layer of the vulcanized rubber sheet by dispensing adhesive to form the hot melt layer. In the dispensing adhesive bonding process, the amount of adhesive applied is 10~40 g / m. 3 The temperature is 100~150℃, the speed is 5~20 m / s, and the pressure is 0~0.4 MPa.

[0015] e. To produce protective clothing fabric.

[0016] Compared with the prior art, the present invention has the following beneficial effects: The high-bonding-strength hot-melt rubber-based composite material and its preparation method provided by this invention improve the excellent heat-sealing processing capability of the rubber-based composite material by laminating a hot-melt film layer on the surface of the vulcanized rubber layer. This overcomes the problem that traditional vulcanized rubber cannot be hot-melted, achieving highly reliable bonding at the joint. The joint achieves dense fusion at the interface, significantly extending its protection time against various chemical reagents such as toluene, acetone, acetonitrile, and chlorine. Furthermore, the joint performance remains consistent with the main material, eliminating weak links in the protection system caused by the use of adhesives. Moreover, even after doubling the abrasion resistance and flexural resistance tests, no delamination or peeling occurred, indicating that the prepared hot-melt composite material has good interfacial bonding strength after heat-sealing processing.

[0017] This invention uses a flexible hot melt film for bonding, which keeps the seams soft, resulting in a good overall feel for the garment, and smooth and beautiful seams, thus improving the appearance quality and processing efficiency of the product.

[0018] Moreover, this invention is not limited to polyester-cotton fabric and polyurethane, and can be achieved with a variety of materials. The material selection is flexible, and it has good universality and industrialization prospects. Attached Figure Description

[0019] Figure 1 This diagram illustrates the structure of the high-bonding-strength, heat-fused rubber-based composite material of the present invention. The diagram only shows the layer structure and does not represent the layer thickness.

[0020] In the diagram: 1-Hot melt layer, 2-First rubber layer, 3-Base fabric layer, 4-Second rubber layer. Detailed Implementation

[0021] The specific embodiments of the present invention will be described in detail below. Example 1

[0022] A method for preparing a high-bonding-strength, heat-fused rubber-based composite material, such as... Figure 1 As shown, the composite material with brominated butyl rubber on both sides is prepared by the following steps: a. On the open mill, control the roller temperature and mix the brominated butyl rubber evenly to prepare the brominated butyl rubber compound for later use; The components of the brominated butyl rubber layer, by weight, include: Brominated butyl rubber: 100 parts; BIBP: 1 copy; Triazine vulcanizing agent (TCY): 0.5 parts; HVA-2: 0.5 parts; Zinc oxide: 1 part; Stearic acid: 1 part; Magnesium oxide: 0.5 parts; Sun-resistant yellow: 5 parts.

[0023] Brominated butyl rubber compound was dissolved in gasoline at a weight ratio of 1:2 to prepare a brominated butyl rubber slurry for later use.

[0024] b. The adhesive tape is prepared using a coating process. A 1.5-meter-wide aramid fabric is selected as the base layer, and fluororubber adhesive is applied to both sides of the base layer in sequence, with an adhesive application rate of 100g / m. 2 After coating one side, apply a release agent and then flip the product over to coat the other side. The release agent is talc or corn starch, and the resulting adhesive tape is made.

[0025] c. Allow the rubber sheet to cool for 3 days or more until the solvent evaporates, then vulcanize it in a vulcanizing tank to obtain vulcanized rubber sheet; the vulcanization conditions are 145℃×1.5h and pressure is 0.35~0.45Mpa to obtain vulcanized rubber sheet.

[0026] d. A 0.1 mm thick polyurethane film is made and bonded to the surface of the rubber layer of the vulcanized rubber sheet via dispensing and bonding to form a hot-melt layer. The amount of adhesive applied during dispensing and bonding is 20 g / m². 3 The temperature is 120℃, the speed is 5m / s, and the pressure is 0.2MPa.

[0027] e. A protective clothing fabric with brominated butyl rubber on both sides is obtained. Example 2

[0028] A method for preparing a high-bonding-strength, heat-fused rubber-based composite material, such as... Figure 1 As shown, the composite material with fluororubber on both sides is prepared by the following steps: a. On the open mill, control the roller temperature to mix the fluororubber evenly and prepare the fluororubber compound for later use; The components of the fluororubber layer, by weight, include: Fluororubber: 100 parts; Bisphenol AF: 3 parts; Accelerator BPP: 1 part; Magnesium oxide: 3 parts; Calcium hydroxide: 6 parts; Calcium oxide: 3 parts; Triazine vulcanizing agent (TCY): 2 parts; HVA-2: 1 serving.

[0029] Fluororubber compound was dissolved in ethyl acetate at a weight ratio of 1:4 to prepare fluororubber paste for later use.

[0030] b. The adhesive tape is prepared using a coating process. A 1.5-meter wide polyester-cotton fabric is selected as the base layer. Fluororubber adhesive is first coated on one side of the base layer, with an adhesive application rate of 120g / m. 2 After applying a release agent (such as talc or corn starch), flip the fabric over. Then, coat the other side of the base fabric with fluororubber adhesive at a rate of 100g / m². 2 .

[0031] c. Allow the rubber sheet to cool for 3 days or more until the solvent evaporates, then vulcanize it in a vulcanizing tank to obtain vulcanized rubber sheet; the vulcanization conditions are 145℃×1.5h and pressure is 0.35~0.45Mpa to obtain vulcanized rubber sheet.

[0032] d. A 0.1 mm thick polyurethane film is made and bonded to the surface of the rubber layer of the vulcanized rubber sheet via dispensing and bonding to form a hot-melt layer. The amount of adhesive applied during dispensing and bonding is 30 g / m². 3 The temperature is 100℃, the speed is 10m / s, and the pressure is 0.3 MPa.

[0033] e. A protective clothing fabric with fluororubber on both sides is produced. Example 3

[0034] A method for preparing a high-bonding-strength, heat-fused rubber-based composite material, such as... Figure 1 As shown, the composite material with fluororubber and brominated butyl rubber as the two rubber layers is prepared by the following steps: a. On the open mill, control the roller temperature and mix brominated butyl rubber and fluororubber evenly to prepare brominated butyl rubber compound and fluororubber compound for later use. The components of the fluororubber layer, by weight, include: Fluororubber: 100 parts; Bisphenol AF: 2 parts; Accelerator BPP: 0.8 parts; Magnesium oxide: 2 parts; Calcium hydroxide: 2 parts; Calcium oxide: 3 parts; Triazine vulcanizing agent (TCY): 1.5 parts; HVA-2: 1 part; Sunlight-resistant yellow: 3 parts; The components of brominated butyl rubber, by weight, include: Brominated butyl rubber: 100 parts; BIBP: 1.2 copies; Triazine vulcanizing agent (TCY): 1.5 parts; HVA-2: 1 part; Zinc oxide: 0.5 parts; Stearic acid: 0.5 parts; Magnesium oxide: 1 part; Sun-resistant yellow: 2 parts.

[0035] Brominated butyl rubber compound was dissolved in gasoline at a weight ratio of 1:2 to prepare a brominated butyl rubber slurry for later use. Fluororubber compound was dissolved in ethyl acetate at a weight ratio of 1:4 to prepare fluororubber paste for later use.

[0036] b. The adhesive tape is prepared using a coating process. A 1.5-meter wide polyester-cotton fabric is selected as the base layer. Fluororubber adhesive is first coated on one side of the base layer, with an adhesive application rate of 120g / m. 2 After applying a release agent (such as talc or corn starch), flip the fabric over. Then, coat the other side of the base fabric layer with brominated butyl rubber adhesive at a rate of 100 g / m². 2 .

[0037] c. Allow the rubber sheet to cool for 3 days or more until the solvent evaporates, then vulcanize it in a vulcanizing tank to obtain vulcanized rubber sheet; the vulcanization conditions are 145℃×1.5h and pressure is 0.35~0.45Mpa to obtain vulcanized rubber sheet.

[0038] d. A 0.1 mm polyethylene film is made and bonded to the surface of the rubber layer of the vulcanized rubber sheet using adhesive dispensing to form a hot-melt layer. The adhesive application rate during dispensing is 40 g / m². 3 The temperature is 100℃, the speed is 10m / s, and the pressure is 0.4 MPa.

[0039] e. A protective clothing fabric with fluororubber and brominated butyl rubber as the two rubber layers is obtained.

[0040] The protective clothing fabrics obtained in Examples 1-3 were processed into seam strips according to the process of cutting, sewing and bonding.

[0041] The joint strips processed in the above three embodiments were subjected to performance testing and compared with the prior art. The results are shown in the table below:

[0042] The test methods for toluene, acetone, acetonitrile, 96% sulfuric acid, 30% sodium hydroxide, and chlorine are in accordance with GB / T 23462-2009; the test methods for abrasion resistance and flexural resistance are in accordance with GB 24539-2021.

[0043] The above test results show that the improved fabric has better uniformity of protective performance at the seams, and no delamination or peeling occurred even after doubling the abrasion resistance and flexural resistance tests, indicating that the bonding strength at the interface of the prepared hot-melt composite material is good after heat sealing.

[0044] The scope of protection claimed by this invention is not limited to the specific embodiments described above. Moreover, for those skilled in the art, this invention can have various modifications and alterations. Any modifications, improvements, and equivalent substitutions made within the concept and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A high-bond-strength hot melt type rubber-based composite material, characterized by: The base cloth layer (3), the rubber layer and the hot melt layer (1); The rubber layer is arranged on at least one surface of the base cloth layer (3), and the rubber layer comprises a first rubber layer (2) and / or a second rubber layer (4), the first rubber layer (2) is a fluororubber layer or a brominated butyl rubber layer, and the second rubber layer (4) is a fluororubber layer or a brominated butyl rubber layer. The hot melt layer (1) is compounded on the outer surface of the rubber layer.

2. A high bond strength hot melt type rubber based composite material according to claim 1, characterized in that: The components of the fluororubber layer include, by weight: Fluororubber: 100 parts; Bisphenol AF: 1.5-3 parts; Promoter BPP: 0.1-1 part; Magnesium oxide: 0.5-3 parts; Calcium hydroxide: 2-6 parts; Calcium oxide: 0.5-3 parts; Triazine vulcanizing agent: 0.5-3 parts; HVA-2: 0.5-1.5 parts.

3. A high bond strength hot melt type rubber based composite material according to claim 1, characterized in that: The components of the brominated butyl rubber layer include, by weight: Brominated butyl rubber: 100 parts; BIBP: 0.5-1.5 parts; Triazine vulcanizing agent: 0.5-3 parts; HVA-2: 0.5-1.5 parts; Zinc oxide: 0.5-1.5 parts; Stearic acid: 0.5-1.5 parts; Magnesium oxide: 0.5-1 part.

4. A high bond strength hot melt type rubber based composite material according to claim 1, characterized in that: The components of the rubber layer also include fastness yellow: 0-5 parts, excluding 0 parts.

5. A high bond strength hot melt type rubber based composite material as claimed in claim 1, wherein: The material of the hot melt layer (1) is polyurethane, polyethylene or polyvinyl chloride, and the thickness is 0.1 mm; The material of the base cloth layer (3) is polyester cotton, aramid or nylon.

6. A method for producing a high-bond-strength hot fusion type rubber base composite material according to any one of claims 1 to 5, characterized by, The steps include: a. uniformly mix the raw materials of the rubber layer to obtain a rubber compound, dissolve the rubber compound in a solvent to obtain a rubber paste; b. apply the rubber paste on the base cloth layer (3) to form a rubber layer; c. after the solvent is volatilized, perform vulcanization treatment to obtain a vulcanized rubber cloth; d. the material of the hot melt layer (1) is made into a film, which is attached to the surface of the rubber layer of the vulcanized rubber cloth by point gluing to form a hot melt layer (1), e. obtain a protective clothing fabric.

7. The method for preparing a high-adhesion-strength hot-melt rubber-based composite material according to claim 6, characterized in that: In step a, when the rubber paste is brominated butyl rubber and the solvent is gasoline, the weight ratio of the rubber paste to the solvent is 1:2; when the rubber paste is fluororubber and the solvent is ethyl acetate, the weight ratio of the rubber paste to the solvent is 1:

4.

8. The method for preparing a high-adhesion-strength hot-melt rubber-based composite material according to claim 6, characterized in that: In step b, the following steps are included: Select polyester cotton as the base cloth layer (3), first coat fluororubber paste on one side of the base cloth layer (3), then turn over after applying release agent, the release agent is talc or corn starch, and then coat brominated butyl rubber paste on the other side of the base cloth layer (3); Or both sides are coated with fluororubber paste, or both sides are coated with brominated butyl rubber paste.

9. The method for preparing a high-adhesion-strength hot-melt rubber-based composite material according to claim 6, characterized in that: In step c, the vulcanization conditions are 145℃×1.5h, and the pressure is 0.35-0.45MPa.

10. The method for preparing a high-adhesion-strength hot-melt rubber-based composite material according to claim 6, characterized in that: The glue amount is 10-40 g / m in the dispensing and sticking of step d 3 , the temperature is 100-150 ℃, the speed is 5-20 m / s, and the pressure is 0-0.4 MPa.

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