Elastomer adhesion promoter as well as preparation method and brushing process thereof

Abstract

The invention belongs to the technical field of elastomer adhesion promoters, particularly discloses an elastomer adhesion promoter as well as a preparation method and a brushing process thereof, and relates to the field of elastomer adhesion promoters. The formula is divided into a primer, a middle coating agent and a surface coating agent, the formula of the primer contains chlorine-containing rubber and polyisocyanate adhesive, the formula of the middle coating agent contains chlorine-containing rubber, synthetic resin, polyisocyanate adhesive and a modifier, and the surface coating agent contains synthetic resin and a modifier. The brushing process method comprises a multi-layer brushing process, specifically, one layer of primer is brushed, two to three layers of middle coating agent are brushed, and two to three layers of surface coating agent are brushed. The elastomer adhesion promoter can realize rigid-flexible transition, and has good mechanical properties.

Description

Technical Field

[0001] The invention belongs to the technical field of adhesion promoters, and particularly relates to an elastomer adhesion promoter and a preparation method and a brush coating process thereof. Background Art

[0002] The waterproof and sound-permeable window of an underwater device usually needs to be vulcanized with rubber, and the contact surface between the vulcanized rubber and the substrate is generally a rigid material, such as stainless steel, aluminum alloy, epoxy resin, etc. The thermal shrinkage rates of different materials and vulcanized rubber vary greatly, and the uneven shrinkage during the molding process is prone to produce stress, which affects the adhesion between the sound-permeable window and the vulcanized substrate. Therefore, it is necessary to apply a layer of adhesion promoter between the substrate and the rubber, but most of the adhesion promoters on the market are single-component rigid adhesion promoters. Since sound waves will attenuate at the interface where rigidity and flexibility suddenly change, it will have a negative impact on the acoustic performance of the device. Therefore, it is of great significance to study and develop an elastomer adhesion promoter with flexible transition. Summary of the invention

[0003] The purpose of the present invention is to overcome the defects in the prior art and provide an elastomer adhesion promoter and a preparation method and a brush coating process thereof.

[0004] In a first aspect of the present invention, there is provided an elastomer adhesion promoter, comprising a primer, a mid-coat and a top-coat;

[0005] The primer comprises chlorinated rubber and polyisocyanate glue, and the mass ratio of the chlorinated rubber to the polyisocyanate glue is (10-1):1;

[0006] The top coating agent comprises a synthetic resin and a modifier, wherein the mass ratio of the synthetic resin to the modifier is (20-3):1;

[0007] The intermediate coating agent includes a primer and a top coating agent, and the mass ratio of the primer to the top coating agent is (5-1):1.

[0008] A further solution is that the primer and topcoat are both dissolved in an organic solvent, the organic solvent of the primer is one or more of ethylene dichloride, gasoline, and ethyl acetate; the solvent of the topcoat is one or more of ethanol, ethyl acetate, toluene, xylene, butanol, and butanone.

[0009] In a further embodiment, the chlorine-containing rubber in the primer includes one or more of chlorinated rubber, chloroprene rubber, chlorinated polyethylene rubber, and chlorinated ethylene-propylene rubber.

[0010] A further solution is that the synthetic resin in the top coating agent includes one or more of epoxy resin, phenolic resin, polyurethane resin, acrylate resin, urea-formaldehyde resin, polyvinyl acetate resin, polyacrylic acid resin, and polyvinyl butyral resin; the modifier in the top coating agent includes one or more of propyl acetate cellulose, cellulose acetate butyrate, propylene glycol adipate polyester, propylene glycol sebacate polyester, epoxidized soybean oil, and epoxidized linseed oil.

[0011] A second aspect of the present invention provides a method for preparing an elastomer adhesion promoter, comprising the following steps:

[0012] A certain amount of chlorinated rubber is weighed and dissolved in an organic solvent at a solid-liquid ratio of 1:(1-6) to obtain a mixture I;

[0013] Weigh polyisocyanate glue in a mass ratio of (10-1):1, add it to mixture I and stir evenly to obtain a primer;

[0014] Weigh a certain amount of synthetic resin and modifier according to the mass ratio of synthetic resin to modifier (20-3):1, and then weigh a certain amount of organic solvent according to the solid-liquid ratio of 1:(5-25);

[0015] Adding synthetic resin and modifier into organic solvent, stirring and dissolving to obtain top coating agent;

[0016] The primer and top coating agent are mixed in a mass ratio of (5-1):1 and stirred evenly to obtain a middle coating agent.

[0017] A third aspect of the present invention provides a process for brushing an elastomer adhesion promoter, comprising:

[0018] Apply 1 coat of primer, 2 to 3 coats of mid-coat, and 2 to 3 coats of topcoat.

[0019] A further solution is that the brushing process of the primer is: after preheating the rigid substrate at 30 to 60° C. for 0.5 to 3 hours, the primer is evenly brushed on the rigid substrate to obtain a rigid substrate coated with the primer;

[0020] The process of brushing the intermediate coating agent is as follows: brushing a first layer of intermediate coating agent on the rigid substrate coated with the coating agent, leaving it to stand for 5 to 20 minutes and then brushing the next layer of intermediate coating agent, and leaving it to stand for 12 to 36 hours in a ventilated environment after brushing to obtain a rigid substrate coated with the intermediate coating agent;

[0021] The brushing process of the top coating agent is as follows: preheating the rigid substrate coated with the middle coating agent at 30-60° C. for 0.5-3 hours, brushing the first layer of the top coating agent, leaving it to stand for 5-30 minutes after the brushing is completed, brushing the next layer of the top coating agent, and leaving it to stand for 1-3 hours in a ventilated environment after completion.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] The elastomer adhesion promoter provided by the present invention, the primer thereof serves as an intermediate medium for improving the bonding strength between the mid-coat, the top-coat and the material, not only introduces active groups, but also forms good interactions with the mid-coat and the top-coat, and also introduces the flexible components of the rubber, thereby achieving good bonding effect and flexible transition effect.

[0024] The elastomer adhesion promoter provided by the present invention, wherein the coating agent and the top coating agent adopt a multi-component compounding method, and by regulating the dispersed phase of rubber and resin, the adhesion, mechanical properties, chemical stability, thermal stability and other properties of the material are guaranteed. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The following drawings are only used to illustrate and explain the present invention, and are not used to limit the scope of the present invention, wherein:

[0026] Figure 1 It is a schematic diagram of the technical process of the present invention. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solution, design method and advantages of the present invention clearer, the present invention is further described in detail by specific embodiments in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0028] Example 1

[0029] This embodiment provides a formula, preparation and brushing process of an elastomer adhesion promoter, and the specific implementation contents are as follows:

[0030] The elastomer adhesion promoter includes a primer, a middle coating and a top coating, wherein the primer includes chlorinated rubber and polyisocyanate glue, and the mass ratio of the chlorinated rubber to the polyisocyanate glue is 3:1; the top coating includes a synthetic resin and a modifier, and the mass ratio of the primer to the top coating is 5:1; the middle coating is a mixture of the primer and the top coating.

[0031] The preparation method of the elastomer adhesion promoter is as follows:

[0032] A certain amount of chlorinated rubber is weighed and dissolved in an organic solvent at a solid-liquid ratio of 1:4 to obtain a mixture I, wherein the organic solvent is ethylene dichloride;

[0033] Weigh polyisocyanate glue at a mass ratio of 3:1, add it to mixture I and stir evenly to obtain a primer;

[0034] A certain amount of synthetic resin and modifier are weighed according to a mass ratio of synthetic resin to modifier of 5:1, and a certain amount of organic solvent is weighed according to a solid-liquid ratio of 1:10, wherein the organic solvent is a mixed solvent of ethanol, ethyl acetate, xylene and butanol;

[0035] Adding synthetic resin and modifier into organic solvent, stirring and dissolving to obtain top coating agent;

[0036] The primer and topcoat were mixed in a mass ratio of 1:1 and stirred evenly to obtain a mid-coat.

[0037] The brushing process of the elastomer adhesion promoter is: apply 1 layer of the primer, 2 layers of the mid-coat, and 2 layers of the topcoat.

[0038] Specifically, the process of brushing the primer is as follows: preheat the rigid substrate at 50°C for 2 hours, and then evenly brush the primer on the rigid substrate to obtain a rigid substrate coated with the primer; brush the first layer of the intermediate coating on the rigid substrate coated with the coating, and then let it stand for 10 minutes after brushing, and then brush the second layer of the intermediate coating, and then let it stand in a ventilated environment for 24 hours after brushing, to obtain a rigid substrate coated with the intermediate coating; preheat the rigid substrate coated with the intermediate coating at 50°C for 0.5 hours, brush the first layer of the top coating, and then let it stand for 20 minutes after brushing, and then brush the second layer of the top coating, and then let it stand in a ventilated environment for 1 hour after completion. Finally, transfer the rigid substrate to a 60°C oven for heating for 1 hour, and immediately start vulcanization of the outer rubber after heating.

[0039] Example 2

[0040] The formula of the elastomer adhesion promoter in this embodiment is similar to that in embodiment 1, except that the synthetic resin of the topcoat used is phenolic resin and epoxy resin in a ratio of 1:1, and no modifier is added. The preparation process and brush coating process are the same as those in embodiment 1.

[0041] Comparative Example 1

[0042] The formula of the elastomer adhesion promoter in this comparative example is similar to that in Example 1, except that the ratio of the chlorinated rubber to the polyisocyanate adhesive in the primer used is 12:1.

[0043] Its preparation process and brush coating process are the same as those in Example 1.

[0044] Comparative Example 2

[0045] This comparative example is a formula, preparation and brushing process of an elastomer adhesion promoter, and the specific implementation contents are as follows:

[0046] The formula of the elastomer adhesion promoter is as follows: the primer contains chlorinated rubber, chloroprene rubber and polyisocyanate glue, the top coating contains phenolic resin, polyvinyl butyral resin and cellulose acetate butyrate, and there is no middle coating agent.

[0047] The preparation method of the elastomer adhesion promoter is:

[0048] (1) The preparation method of the primer is as follows: firstly, dissolve the chlorinated rubber in a solvent; wherein the solvent is ethylene dichloride; wherein the solid-liquid ratio is 1:4. Then, add polyisocyanate glue; wherein the ratio of the chlorinated rubber to the polyisocyanate glue is 3:1, and stir evenly.

[0049] (2) The preparation method of the top coating agent is: adding a synthetic resin and a modifier into an organic solvent and stirring to dissolve; wherein the mass ratio of the synthetic resin to the modifier is 5:1; wherein the solvent is a mixed solvent of ethanol, ethyl acetate, xylene and butanol, and the ratio thereof is 2:2:1:1.

[0050] The brushing process of the elastomer adhesion promoter is as follows: the primer is brushed with one layer, the middle coating agent is not brushed with, and the top coating agent is brushed with two layers.

[0051] Specifically, the process of brushing the primer is as follows: preheat the rigid substrate at 50°C for 2 hours, then brush the primer evenly on the substrate, and let it stand for 24 hours in a ventilated environment after brushing. The process of brushing the topcoat is as follows: preheat the product at 50°C for 0.5 hours, brush the first coat of topcoat, let it stand for 20 minutes after brushing, brush the second coat of topcoat, and let it stand for 1 hour in a ventilated environment after completion. Transfer the product to a 60°C oven for heating for 1 hour, and immediately start vulcanization of the outer rubber after heating.

[0052] Test Case

[0053] According to the requirements of GB / T 15254-2014 180° Peel Test for Vulcanized Rubber and Metal Bonding, test pieces of commonly used metal-rubber adhesion promoters such as Xibang 248, Chemlok, and Leckner as well as the examples were prepared, and peel tests were carried out on a universal material testing machine. The peel strength results are shown in Table 1.

[0054] Table 1 Peel strength of common adhesion promoters and examples at room temperature

[0055] project Peel strength (kN / m) Example 1 12.8 Example 2 11.5 Comparative Example 1 5.2 Comparative Example 2 6.8 Chemlock 10.56 Lekna 11.96 Xibang 248 11.64

[0056] From the above results, it can be seen that Examples 1-2 adopt the formula, preparation method and brush coating process of the present invention, the components can be well matched, the layers are tightly bonded, and can have a good transition, so that the adhesion promoter has good mechanical properties, and the performance is better than the commonly used metal-rubber adhesion promoters on the market.

[0057] In Comparative Example 1, since too little polyisocyanate glue was used in the primer, the adhesion between the primer and the metal was significantly reduced due to the addition of too little.

[0058] In Comparative Example 2, since no midcoat was added, there was a lack of an adhesive transition layer between the primer and the topcoat, and the adhesive force between the two layers was significantly reduced.

[0059] The embodiments of the present invention have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The selection of terms used herein is intended to best explain the principles of the embodiments, practical applications, or technical improvements in the market, or to enable other persons of ordinary skill in the art to understand the embodiments disclosed herein.

Claims

1. An elastomer adhesion promoter, characterized in that: Including primer, mid-coat and top-coat; The primer comprises chlorinated rubber and polyisocyanate glue, and the mass ratio of the chlorinated rubber to the polyisocyanate glue is (10-1):1; The top coating agent comprises a synthetic resin and a modifier, wherein the mass ratio of the synthetic resin to the modifier is (20-3):1; The intermediate coating agent includes a primer and a top coating agent, and the mass ratio of the primer to the top coating agent is (5-1):

1.

2. An elastomer adhesion promoter according to claim 1, characterized in that: The primer and topcoat are both dissolved in an organic solvent. The organic solvent of the primer is one or more of ethylene dichloride, gasoline, and ethyl acetate; the solvent of the topcoat is one or more of ethanol, ethyl acetate, toluene, xylene, butanol, and butanone.

3. The elastomer adhesion promoter according to claim 1, characterized in that: The chlorinated rubber in the primer includes one or more of chlorinated rubber, chloroprene rubber, chlorinated polyethylene rubber, and chlorinated ethylene-propylene rubber.

4. The elastomer adhesion promoter according to claim 1, characterized in that: The synthetic resin in the topcoat includes one or more of epoxy resin, phenolic resin, polyurethane resin, acrylate resin, urea-formaldehyde resin, polyvinyl acetate resin, polyacrylic acid resin, and polyvinyl butyral resin; the modifier in the topcoat includes one or more of propyl acetate cellulose, cellulose acetate butyrate, propylene glycol adipate polyester, propylene glycol sebacate polyester, epoxidized soybean oil, and epoxidized linseed oil.

5. A method for preparing an elastomer adhesion promoter, characterized in that: The following steps are involved: A certain amount of chlorinated rubber is weighed and dissolved in an organic solvent at a solid-liquid ratio of 1:(1-6) to obtain a mixture I; Weigh polyisocyanate glue in a mass ratio of (10-1):1, add it to mixture I and stir evenly to obtain a primer; Weigh a certain amount of synthetic resin and modifier according to the mass ratio of synthetic resin to modifier (20-3):1, and then weigh a certain amount of organic solvent according to the solid-liquid ratio of 1:(5-25); Adding synthetic resin and modifier into organic solvent, stirring and dissolving to obtain top coating agent; The primer and top coating agent are mixed in a mass ratio of (5-1):1 and stirred evenly to obtain a middle coating agent.

6. A process for brushing an elastomer adhesion promoter, characterized in that: include: Apply 1 coat of primer, 2 to 3 coats of mid-coat, and 2 to 3 coats of topcoat.

7. The elastomer adhesion promoter brush coating process according to claim 6, characterized in that: The brushing process of the primer is as follows: preheating the rigid substrate at 30-60° C. for 0.5-3 hours, and then evenly brushing the primer on the rigid substrate to obtain a rigid substrate coated with the primer; The process of brushing the intermediate coating agent is as follows: brushing a first layer of intermediate coating agent on the rigid substrate coated with the coating agent, leaving it to stand for 5 to 20 minutes and then brushing the next layer of intermediate coating agent, and leaving it to stand for 12 to 36 hours in a ventilated environment after brushing to obtain a rigid substrate coated with the intermediate coating agent; The brushing process of the top coating agent is as follows: preheating the rigid substrate coated with the middle coating agent at 30-60° C. for 0.5-3 hours, brushing the first layer of the top coating agent, leaving it to stand for 5-30 minutes after the brushing is completed, brushing the next layer of the top coating agent, and leaving it to stand for 1-3 hours in a ventilated environment after completion.

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