Stable-storage and wiredrawing-free finger-pressed adhesive and preparation method thereof

Abstract

The invention relates to the technical field of shiatsu adhesives for automobile manufacturing, in particular to a shiatsu adhesive stable in storage and free of wire drawing and a preparation method of the shiatsu adhesive. The invention relates to a finger-pressing adhesive with storage stability and no wire drawing, which is prepared from the following raw material components in parts by weight: 13 to 18 parts of powdered nitrile rubber, 13 to 17 parts of plasticizer, 23 to 27 parts of HPVC resin, 5 to 10 parts of thickening agent, 32 to 40 parts of filler, 5 to 10 parts of tackifier, 0.6 to 1 part of curing agent and 0.3 to 0.5 part of adhesion promoter, and the sum of the parts by weight of all the components is 100. The shiatsu glue with stable storage and no wiredrawing has the characteristics of no hand sticking, no wiredrawing and no hair slip, has small needle penetration change within three-month storage period, has good construction performance and mechanical property, and solves the technical problems that the existing shiatsu glue is easy to stick to hands, wiredrawing and hair slip are caused during use, the storage period is short, and the existing shiatsu glue is hard after being placed for a long time and is not easy to construct.

Description

Technical Field

[0001] The invention relates to the technical field of finger-pressing adhesive for automobile manufacturing, and in particular to a finger-pressing adhesive which is stable in storage and does not draw threads, and a preparation method thereof. Background Art

[0002] Finger pressure glue plays a role in sealing, dustproofing, waterproofing and vibration isolation in automobile manufacturing. The current finger pressure glue is easy to become sticky during construction, will stick to the hands, and is not easy to clean. When the finger pressure glue sticks to the hands, the hands touching the car body will contaminate the car body paint surface, affecting product quality. Because the finger pressure glue needs to be pulled and rubbed during construction, the existing finger pressure glue is prone to wire drawing and hair loss when pulled and rubbed, affecting the on-site environment and the car body, and easily causing quality problems. In addition, the current finger pressure glue generally has a large viscosity change and a short storage period. The needle penetration will change sharply after about two months of storage. The finger pressure glue becomes hard, making it difficult to construct or even unusable. Summary of the invention

[0003] In view of the problems raised by the background technology, the purpose of the present invention is to propose a storage-stable, non-stringing finger pressure glue, which has the characteristics of not being sticky, non-stringing and non-shedding, and the needle penetration changes little during the three-month storage period, and has good construction performance and mechanical properties. The technical problems that the existing finger pressure glue is easy to stick to the hands, stringing and shedding during use, short storage period, hardening after long-term storage and difficult to construct are solved.

[0004] Another object of the present invention is to propose a method for preparing the above-mentioned storage-stable, non-stringing finger pressure glue. The preparation method is simple, and the prepared storage-stable, non-stringing finger pressure glue has the advantages of not sticking to hands, not stringing, not shedding, and little change in needle penetration during the storage period.

[0005] To achieve this object, the present invention adopts the following technical solutions:

[0006] A storage-stable, non-drawing finger-pressure adhesive, wherein the raw materials of the finger-pressure adhesive include the following components, calculated by weight: 13 to 18 parts of powdered nitrile rubber, 13 to 17 parts of a plasticizer, 23 to 27 parts of an HPVC resin, 5 to 10 parts of a thickener, 32 to 40 parts of a filler, 5 to 10 parts of a tackifier, 0.6 to 1 part of a curing agent, and 0.3 to 0.5 parts of an adhesion promoter, wherein the sum of the weight parts of all the above components is 100 parts;

[0007] The powdered nitrile rubber is a slightly cross-linked powdered nitrile rubber;

[0008] The plasticizers are alkyl sulfonate phenyl ester and alcohol ester hexadecene;

[0009] The polymerization degree of the HPVC resin is 2000-4000.

[0010] It is further explained that the acrylonitrile mass content of the powdered nitrile rubber is 29-32%.

[0011] To further illustrate, the HPVC resin is YH2500 type HPVC resin.

[0012] To further illustrate, the tackifier is any one or more combinations of E51 epoxy resin and E44 epoxy resin.

[0013] To further illustrate, the thickener is N20 type fumed silica or M-5 type fumed silica.

[0014] To further illustrate, the filler is any one or more combinations of nano calcium carbonate and heavy calcium carbonate.

[0015] It is further described that the curing agent is dicyandiamide.

[0016] Further, the adhesion promoter is modified urea.

[0017] A method for preparing a storage-stable, non-stringing finger-pressure adhesive, for preparing the storage-stable, non-stringing finger-pressure adhesive, comprises the following steps:

[0018] The alcohol ester hexadecene and powdered nitrile rubber are kneaded to obtain an intermediate;

[0019] Alkyl sulfonate phenyl ester, HPVC resin, thickener, filler, tackifier, curing agent and adhesion promoter are added in a stirring state, and kneading and stirring are continued to obtain a storage-stable and non-stringy finger-pressure adhesive.

[0020] Compared with the prior art, the embodiments of the present invention have the following beneficial effects:

[0021] By using slightly cross-linked powdered nitrile rubber as the base material, TXIB alcohol ester hexadecene is used as a plasticizer to match the slightly cross-linked powdered nitrile. Since the molecular chains of the slightly cross-linked powdered nitrile have been partially cross-linked, the intermolecular force is reduced compared to the uncross-linked nitrile rubber, and the elongation is reduced. TXIB alcohol ester hexadecene is a primary plasticizer with the characteristics of low molecular weight and low viscosity. As a plasticizer for powdered nitrile rubber, it can effectively reduce the viscosity of the mixed powdered nitrile rubber and reduce the wire drawing property. After the product is formed, the slightly cross-linked powdered nitrile rubber and TXIB alcohol ester hexadecene can be matched to reduce the viscosity and elongation of the product while keeping it soft and easy to rub. The molecules break when pulling, achieving the effect of no wire drawing and no sticking to the hands. Since no wire drawing will occur, it also avoids the phenomenon of wire drawing breaking due to excessive length, causing hair loss, and avoiding the problem of contaminating the workpiece. In the case of slightly cross-linked powdered nitrile rubber and TXIB alcohol ester hexadecene, since the slightly cross-linked powdered nitrile rubber has been preliminarily cross-linked, it cannot form overall elasticity with the subsequent PVC resin and cannot achieve a high material body strength. If a combination of PVC resin with a normal degree of polymerization and conventional DINP diisononyl phthalate is used, the material strength and cohesive strength cannot be guaranteed, and the viscosity changes greatly during the storage period, which cannot meet the needs of a longer storage period. By using high-polymerization HPVC resin and alkyl sulfonate phenyl ester, compared with low-polymerization PVC resin, high-polymerization HPVC resin has a higher K value, a higher gelation temperature, and a poor ability to swell and absorb plasticizers, while alkyl sulfonate phenyl ester has a longer carbon chain and a lower gelation ability, making it difficult for the finger pressure glue product to form gel during storage, and the needle penetration changes less. The needle penetration (softness and hardness) of the finger pressure glue changes little during the 3-month storage period. The above-mentioned finger pressure glue which is stable in storage and does not draw hair has the characteristics of not being sticky, not drawing hair and not shedding hair, and the needle penetration changes little during the three-month storage period, and has good construction performance and mechanical properties, thus solving the technical problems that the existing finger pressure glue is easy to stick to the hands, draw hair and shed hair during use, has a short storage period, and becomes hard after being placed for a long time, making it difficult to construct. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a diagram of a product rubbing experiment of Example 1 of the present invention.

[0023] Figure 2 This is a diagram of a product breaking test of Example 1 of the present invention.

[0024] Figure 3 This is a product rubbing experiment diagram of Comparative Example 2 of the present invention.

[0025] Figure 4 This is a diagram of a product breaking test of Comparative Example 2 of the present invention. DETAILED DESCRIPTION

[0026] A storage-stable, non-drawing finger-pressure adhesive, wherein the raw materials of the finger-pressure adhesive include the following components, calculated by weight: 13 to 18 parts of powdered nitrile rubber, 13 to 17 parts of a plasticizer, 23 to 27 parts of an HPVC resin, 5 to 10 parts of a thickener, 32 to 40 parts of a filler, 5 to 10 parts of a tackifier, 0.6 to 1 part of a curing agent, and 0.3 to 0.5 parts of an adhesion promoter, wherein the sum of the weight parts of all the above components is 100 parts;

[0027] The powdered nitrile rubber is a slightly cross-linked powdered nitrile rubber;

[0028] The plasticizers are alkyl sulfonate phenyl ester and alcohol ester hexadecene;

[0029] The polymerization degree of the HPVC resin is 2000-4000.

[0030] Fingering glue plays the role of sealing, dustproof and waterproof and vibration isolation in automobile manufacturing. The current fingering glue is easy to become sticky during construction, will stick to the hands, and is not easy to clean. When the fingering glue sticks to the hands, the hands touch the car body and pollute the car body paint surface, affecting product quality. Because the fingering glue needs to be pulled apart and rubbed during construction, the existing fingering glue is prone to wire drawing and hair loss (powder loss) when pulled apart and rubbed, affecting the on-site environment and the car body and polluting the workpiece, which is easy to cause quality problems. In addition, the current fingering glue generally has a large viscosity change and a short storage period. The needle penetration will change sharply after being placed for about two months, and the fingering glue becomes hard, which makes it difficult to construct or even unusable.

[0031] The present invention is based on a slightly cross-linked powdered nitrile rubber as a substrate, wherein TXIB alcohol ester hexadecene is used as a plasticizer to cooperate with the slightly cross-linked powdered nitrile, because the slightly cross-linked powdered nitrile molecular chains have been partially cross-linked, the intermolecular force is reduced relative to the uncross-linked nitrile rubber, and the elongation decreases. TXIB alcohol ester hexadecene is a primary plasticizer, with the characteristics of low molecular weight and low viscosity. As a plasticizer for powdered nitrile rubber, the viscosity of the powdered nitrile rubber after mixing can be effectively reduced, and the wire drawing property can be reduced. After the subsequent product is formed, the slightly cross-linked powdered nitrile rubber is matched with TXIB alcohol ester hexadecene, which can reduce the viscosity and elongation under the premise that the product remains soft and easy to rub, and the molecules are broken when pulled, so as to achieve the effect of not drawing and not sticking to the hand. Since wire drawing will not occur, the wire drawing is also avoided to be broken due to excessive length, and the phenomenon of hair loss occurs, and the problem of contaminating the workpiece is avoided. In the case of slightly cross-linked powdered nitrile rubber and TXIB alcohol ester hexadecene collocation, since the slightly cross-linked powdered nitrile rubber has been preliminarily cross-linked, it is impossible to form overall elasticity with subsequent PVC resin, and it is impossible to reach higher material body strength. If the PVC resin of ordinary polymerization degree is combined with conventional DINP diisononyl phthalate, the material strength and cohesive strength cannot be guaranteed, and the viscosity variation range is also relatively large during the storage period, and the demand of a longer storage period cannot be met. The present invention uses HPVC resin with high polymerization degree to cooperate with alkyl phenyl sulfonate, compared with PVC resin with low polymerization degree, the K value of HPVC resin with high polymerization degree is relatively high, and the gelation temperature is relatively high, and the ability of swelling and absorbing plasticizer is relatively poor, and the carbon chain of alkyl phenyl sulfonate is relatively long, and the gelation ability is low, so that the finger pressure glue product is not easy to form gel during storage, and the needle penetration changes less, and the needle penetration (soft and hard) of the finger pressure glue changes little during the storage period of 3 months.

[0032] To further explain, if the polymerization degree of PVC resin is too large, a higher curing temperature is required, and the curing temperature conditions of the finger pressure glue are relatively high. If the polymerization degree of PVC resin is too low, it will slowly gel during the storage period, causing the needle penetration of the finger pressure glue to change too much during the storage period.

[0033] Further explanation: the amount of the powdered nitrile rubber is 13 to 18 parts. If the content of the powdered nitrile rubber is too little, the cohesive strength of the finger-pressing glue after curing is too small; the amount of the plasticizer is 13 to 17 parts. If the plasticizer is too little, the plasticizing effect on the powdered nitrile rubber and the HPVC resin is insufficient. If the plasticizer is too much, the finger-pressing glue will be too soft; the amount of the HPVC resin is 23 to 27 parts. If the amount of the HPVC resin is too little, it will affect the mechanical properties of the cured finger-pressing glue; the amount of the thickener is 5 to 10 parts, which is used to adjust the hardness of the finger-pressing glue before curing. The amount of the filler is 32 to 40 parts, which plays a filling role; the amount of the tackifier is 5 to 10 parts. If the amount is too low, the bonding ability is poor.

[0034] The storage-stable finger pressure glue that does not draw strings has the characteristics of not being sticky, not drawing strings, and not shedding hairs, and has a small change in needle penetration during a storage period of three months, and has good construction performance and mechanical properties, thereby solving the technical problems of existing finger pressure glues that are easy to stick to the hands, draw strings and shed hairs during use, have a short storage period, and become hardened after being stored for a long time and are difficult to construct.

[0035] It is further explained that the acrylonitrile mass content of the powdered nitrile rubber is 29-32%.

[0036] Use slightly cross-linked powdered nitrile rubber, the molecular chains of the slightly cross-linked powdered nitrile rubber have been partially cross-linked, the intermolecular force is reduced relative to the uncross-linked nitrile rubber, the elongation decreases, and the plasticizer TXIB alcohol ester hexadecene is matched, the alcohol ester hexadecene can effectively reduce the viscosity of the mixed powdered nitrile rubber, reduce the wire drawing property, and make the finger pressure glue prepared have the characteristics of no wire drawing. Preferably, the model of the powdered nitrile rubber is the 35-3A type of powdered nitrile rubber produced by Anqing Hualan Technology Co., Ltd.

[0037] To further illustrate, the HPVC resin is YH2500 type HPVC resin.

[0038] The use of YH2500 HPVC resin with a higher degree of polymerization can ensure the strength of the finger pressure glue, while making it less likely for the finger pressure glue product to form gel during storage and with a small change in needle penetration.

[0039] To further illustrate, the tackifier is any one or more combinations of E51 epoxy resin and E44 epoxy resin.

[0040] The current finger pressure glue usually adopts polyamide tackifier, which can only be bonded on the electrophoretic paint film, and cannot be bonded on the oily metal substrate. In order to achieve a good bonding effect, the substrate surface needs to maintain a high degree of cleanliness, and the metal substrate in the welding workshop is often processed through multiple processes, and impurities such as oil stains and rust may remain on the surface, so it cannot be used in the welding workshop. The present invention uses epoxy resin as a tackifier. The epoxy resin tackifier has good wettability and permeability to a variety of substrates such as metals and plastics, and can resist the influence of adverse factors such as oil stains and metal dust in the welding workshop, and maintain a stable bonding ability. By using a sufficient amount of epoxy resin as a tackifier, the problem that the commonly used finger pressure glue on the market cannot be used in the welding workshop is solved.

[0041] To further illustrate, the thickener is N20 type fumed silica or M-5 type fumed silica.

[0042] By selecting N20 type fumed silica or M-5 type fumed silica, the hardness of the finger pressure adhesive before curing can be adjusted, so that the construction performance of the finger pressure adhesive is better.

[0043] Preferably, the filler is any one or more combinations of nano calcium carbonate and heavy calcium carbonate.

[0044] Selecting nano calcium carbonate and heavy calcium carbonate as fillers can play a filling role and effectively reduce costs.

[0045] Preferably, the curing agent is dicyandiamide.

[0046] Preferably, the adhesion promoter is modified urea.

[0047] Preferably, the adhesion promoter is 100B modified urea produced by Guangdong Guyan Electronic Materials Co., Ltd. By using the adhesion promoter, the time required for the bonding process can be shortened.

[0048] A method for preparing a storage-stable, non-stringing finger-pressure adhesive, for preparing the storage-stable, non-stringing finger-pressure adhesive, comprises the following steps:

[0049] The alcohol ester hexadecene and powdered nitrile rubber are kneaded to obtain an intermediate;

[0050] Alkyl sulfonate phenyl ester, HPVC resin, thickener, filler, tackifier, curing agent and adhesion promoter are added in a stirring state, and kneading and stirring are continued to obtain a storage-stable and non-stringy finger-pressure adhesive.

[0051] The invention discloses a finger-pressure adhesive which is stable in storage and does not draw strings by kneading hexadecyl alcohol ester and powdered nitrile rubber to obtain an intermediate, and then adding alkyl sulfonate phenyl ester, HPVC resin, thickener, filler, tackifier, curing agent and adhesion promoter to continue kneading to obtain a finger-pressure adhesive which is stable in storage and does not draw strings. The preparation method is simple, and the hexadecyl alcohol ester is first used as a plasticizer to match with slightly cross-linked powdered nitrile to obtain an intermediate, and then HPVC resin and alkyl sulfonate phenyl ester are added to make the finger-pressure adhesive which is stable in storage and does not draw strings to obtain has the advantages of not sticking to hands, not drawing strings, not shedding hair, and small change in needle penetration during the storage period.

[0052] It is further explained that during the process of rubber refining to become an intermediate, the powdered nitrile rubber gradually absorbs the plasticizer by relying on the friction between the rubber particles. At this stage, the hexadecyl alcohol ester plasticizer is slowly added to make the powdered nitrile rubber easier to refine.

[0053] In order to facilitate the understanding of the present invention, the present invention is described more fully below. The present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive.

[0054] If no specific techniques or conditions are specified in the examples, the techniques or conditions described in the literature in the field or the product instructions are used. If no manufacturer is specified for the reagents or instruments used, they are all conventional products that can be purchased commercially.

[0055] Examples 1-6

[0056] A method for preparing a storage-stable, non-drawing finger-pressure adhesive comprises the following steps (the raw materials are calculated by weight and prepared according to the formula in Table 1):

[0057] Add hexadecyl alcohol ester plasticizer and powdered nitrile rubber (35-3A type powdered nitrile rubber, Anqing Hualan Technology Co., Ltd.) into a pressure kneading mill for kneading, stop the machine after stirring for 10 minutes, scrape the cylinder, and continue stirring for 10 minutes to obtain an intermediate; after checking that the powdered nitrile rubber is refined, add alkyl sulfonate phenyl ester T-50 plasticizer, HPVC resin (YH2500 type HPVC resin), thickener (N20 type fumed silica), filler (nano calcium carbonate), tackifier (E51 type epoxy resin), curing agent (dicyandiamide) and adhesion promoter (100B type modified urea, Guangdong Guyan Electronic Materials Co., Ltd.) under stirring, continue kneading and stirring for 10 minutes, stop the machine, scrape the cylinder, and continue stirring for 10 minutes to obtain a storage-stable, non-stringing finger-pressure adhesive.

[0058] Table 1 Raw material components of the storage-stable, non-stringing finger-pressure adhesive of Examples 1-6

[0059]

[0060]

[0061] The finger pressure glue prepared in Examples 1 to 6 is white and semi-hard with uniform color. The finger pressure glue prepared in Examples 1 to 6 is subjected to rubbing and breaking tests. The finger pressure glue prepared in Examples 1 to 6 is not sticky and does not fall off when rubbed (such as Figure 1 As shown, it is a rubbing test diagram of the product of Example 1), and there is no wire drawing when it is broken (such as Figure 2 The figure is a tensile test diagram of the product of Example 1). The penetration test was conducted using a SYD-2810C penetration tester produced by Shanghai Changji Geological Instruments. The penetration of the finger-pressing adhesive changed little during the 3-month storage period. The performance test results of Examples 1 to 6 are shown in Tables 2 and 3 below:

[0062] Table 2 Appearance, operability and penetration test results of Examples 1 to 6

[0063]

[0064]

[0065] Table 3 Changes in needle penetration of Examples 1 to 6 at room temperature

[0066]

[0067]

[0068] Comparative Example 1

[0069] Compared with Example 1, the HPVC resin in Comparative Example 1 was replaced with P450 type PVC resin, and the remaining raw materials and preparation method were consistent with those in Example 1, thereby preparing a finger pressure glue.

[0070] Comparative Example 2

[0071] Compared with Example 1, the alcohol ester hexadecane plasticizer in Comparative Example 2 was replaced by an alkyl sulfonate phenyl ester plasticizer, and the remaining raw materials and preparation method were consistent with those in Example 1, thereby preparing a finger pressure glue.

[0072] Comparative Example 3

[0073] Compared with Example 1, the powdered nitrile rubber in Comparative Example 3 was replaced with liquid nitrile rubber, and the remaining raw materials and preparation method were consistent with those in Example 1, thereby preparing a finger pressure glue.

[0074] Comparative Examples 1 to 3 were tested for appearance, needle penetration and operability. Comparative Example 1 used a low-polymerization degree PVC resin, so that the finger pressure glue prepared in Comparative Example 1 slowly gelled during the storage period, and the needle penetration changed greatly within 3 months. In the end, the finger pressure glue was too hard to use, and it was sticky, powdered, and had stringing. Comparative Example 2 used alkyl sulfonate phenyl ester instead of alcohol ester hexadecene, which caused the finger pressure glue to have obvious stringing and powdering (such as Figure 3 As shown, this is a rubbing test diagram of the product of Comparative Example 2. Figure 4 The results of the performance tests of Example 1, Comparative Examples 1 to 3 are shown in Tables 4 and 5 below:

[0075] Table 4 Appearance, operability and penetration test results of Example 1, Comparative Examples 1 to 3

[0076]

[0077] Table 5 Changes in needle penetration of Example 1, Comparative Examples 1 to Comparative Examples 3 at room temperature

[0078]

[0079]

[0080] Comparative Example 4

[0081] A method for preparing a finger pressure glue comprises the following steps (raw materials are calculated by weight):

[0082] 8 parts of alcohol ester hexadecane plasticizer and 13 parts of powdered nitrile rubber (35-3A type powdered nitrile rubber, Anqing Hualan Technology Co., Ltd.) were added into a pressure kneading mill for kneading, and the machine was stopped after stirring for 10 minutes, the cylinder was scraped, and stirring was continued for 10 minutes to obtain an intermediate; after checking that the powdered nitrile rubber was refined, 10 parts of alkyl sulfonate phenyl ester T-50 plasticizer, 23 parts of HPVC resin (YH2500 type HPVC resin), 6.8 parts of thickener (N20 type fumed silica), 31 parts of filler (nano calcium carbonate), 7 parts of tackifier (E51 type epoxy resin), 0.8 parts of curing agent (dicyandiamide) and 0.4 parts of adhesion promoter (100B type modified urea, Guangdong Guyan Electronic Materials Co., Ltd.) were added under stirring, and the kneading and stirring were continued for 10 minutes, the machine was stopped, the cylinder was scraped, and stirring was continued for 10 minutes to obtain a finger pressure glue.

[0083] Comparative Example 5

[0084] A method for preparing a finger pressure glue comprises the following steps (raw materials are calculated by weight):

[0085] Add 6 parts of alcohol ester hexadecane plasticizer and 12 parts of powdered nitrile rubber (35-3A type powdered nitrile rubber, Anqing Hualan Technology Co., Ltd.) into a pressure kneading mill for kneading, stop the machine after stirring for 10 minutes, shovel the cylinder, and continue stirring for 10 minutes to obtain an intermediate; after checking that the powdered nitrile rubber is kneaded, add 7 parts of alkyl sulfonate phenyl ester T-50 plasticizer, 24 parts of HPVC resin (YH2500 type HPVC resin), 6.8 parts of thickener (N20 type fumed silica), 36 parts of filler (nano calcium carbonate), 7 parts of tackifier (E51 type epoxy resin), 0.8 parts of curing agent (dicyandiamide) and 0.4 parts of adhesion promoter (100B type modified urea, Guangdong Guyan Electronic Materials Co., Ltd.) under stirring, continue kneading and stirring for 10 minutes, stop the machine, shovel the cylinder, and continue stirring for 10 minutes to obtain finger pressure glue.

[0086] Comparative Example 6

[0087] A method for preparing a finger pressure glue comprises the following steps (raw materials are calculated by weight):

[0088] 7 parts of alcohol ester hexadecane plasticizer and 15 parts of powdered nitrile rubber (35-3A type powdered nitrile rubber, Anqing Hualan Technology Co., Ltd.) were added into a pressure kneading mill for kneading, and the machine was stopped after stirring for 10 minutes, the cylinder was scraped, and stirring was continued for 10 minutes to obtain an intermediate; after checking that the powdered nitrile rubber was refined, 7 parts of alkyl sulfonate phenyl ester T-50 plasticizer, 22 parts of HPVC resin (YH2500 type HPVC resin), 6.8 parts of thickener (N20 type fumed silica), 34 parts of filler (nano calcium carbonate), 7 parts of tackifier (E51 type epoxy resin), 0.8 parts of curing agent (dicyandiamide) and 0.4 parts of adhesion promoter (100B type modified urea, Guangdong Guyan Electronic Materials Co., Ltd.) were added under stirring, and the kneading and stirring were continued for 10 minutes, the machine was stopped, the cylinder was scraped, and stirring was continued for 10 minutes to obtain a finger pressure glue.

[0089] The mechanical properties of Example 1 and Comparative Examples 4 to 6 were tested in the following manner: a DC01 cold-rolled steel plate with a thickness of 2.0 mm was used as a test specimen, and the product was prepared into a shear test specimen with a thickness of 2 mm. After curing at 170° C. for 20 min and placing for 24 h, a shear test was performed according to GB / T 7124, and the shear strength and the test failure state were recorded.

[0090] The amount of plasticizer added to the finger glue of Comparative Example 4 is too much, which makes the finger glue too soft, sticky during construction, and the strength decreases after curing; the content of powdered nitrile rubber in the finger glue of Comparative Example 5 is too little, the cohesive strength of the finger glue before curing is too low, and it becomes loose and slag-off, but the shear strength after curing meets the requirements; the amount of HPVC resin in Comparative Example 6 is too little, so that the mechanical properties of the finger glue are poor. The test results are shown in Table 6 below:

[0091] Table 6 Mechanical properties test results of Example 1, Comparative Examples 4 to 6

[0092] project Shear strength(MPa) Require ≥1.5 Example 1 1.88 Comparative Example 4 1.48 Comparative Example 5 1.55 Comparative Example 6 1.35

[0093] The above-mentioned embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A storage-stable, non-drawing finger-pressure adhesive, characterized in that: Calculated by weight, the raw materials of the finger pressure glue include the following components: 13 to 18 parts of powdered nitrile rubber, 13 to 17 parts of plasticizer, 23 to 27 parts of HPVC resin, 5 to 10 parts of thickener, 32 to 40 parts of filler, 5 to 10 parts of tackifier, 0.6 to 1 part of curing agent and 0.3 to 0.5 part of adhesion promoter, and the sum of the weight parts of all the above components is 100 parts; The powdered nitrile rubber is a slightly cross-linked powdered nitrile rubber; The plasticizers are alkyl sulfonate phenyl ester and alcohol ester hexadecene; The polymerization degree of the HPVC resin is 2000-4000.

2. The storage-stable, non-drawing finger-pressure adhesive according to claim 1, characterized in that: The acrylonitrile mass content of the powdered nitrile rubber is 29-32%.

3. The storage-stable, non-stringing finger-pressure adhesive according to claim 1, characterized in that: The HPVC resin is YH2500 type HPVC resin.

4. The storage-stable, non-stringing finger-pressure adhesive according to claim 1, characterized in that: The tackifier is any one or more combinations of E51 epoxy resin and E44 epoxy resin.

5. The storage-stable, non-stringing finger-pressure adhesive according to claim 1, characterized in that: The thickener is N20 type fumed silica or M-5 type fumed silica.

6. The storage-stable, non-stringing finger-pressure adhesive according to claim 1, characterized in that: The filler is any one or more combinations of nano calcium carbonate and heavy calcium carbonate.

7. The storage-stable, non-stringing finger-pressure adhesive according to claim 1, characterized in that: The curing agent is dicyandiamide.

8. The storage-stable, non-stringing finger-pressure adhesive according to claim 1, characterized in that: The adhesion promoter is modified urea.

9. A method for preparing a storage-stable, non-drawing finger-pressure adhesive, characterized in that: The method for preparing the storage-stable, non-stringing finger-pressing adhesive according to any one of claims 1 to 8 comprises the following steps: The alcohol ester hexadecene and powdered nitrile rubber are kneaded to obtain an intermediate; Alkyl sulfonate phenyl ester, HPVC resin, thickener, filler, tackifier, curing agent and adhesion promoter are added in a stirring state, and kneading and stirring are continued to obtain a storage-stable and non-stringy finger-pressure adhesive.

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