Foaming type hot melt adhesive for electric appliances and preparation method of foaming type hot melt adhesive

Abstract

The invention relates to the technical field of hot melt adhesives, and discloses a foaming type hot melt adhesive for an electric appliance and a preparation method thereof, the foaming type hot melt adhesive is sprayed to a bonding position of an electric appliance component, and the hot melt adhesive comprises the following raw material components in percentage by weight: 30-40% of white oil, 25-35% of SEBS rubber, 5-10% of monomer resin, 15-25% of petroleum resin and 0.5-1.0% of an antioxidant. Compared with the prior art, the foaming glue spraying device has better use convenience and is beneficial to improving the working efficiency, the spraying amount of foaming glue can be achieved by controlling the glue outlet amount of a nozzle of the spraying gun, and the manufacturing cost can be reduced; in the preparation process of the hot melt adhesive, no chemical foaming agent is used, so that the hot melt adhesive is more environment-friendly.

Description

Technical Field

[0001] The invention relates to the technical field of hot melt adhesives, and in particular to a foaming hot melt adhesive for electrical appliances and a preparation method thereof. Background Art

[0002] In the prior art, if it is necessary to fix an electrical component to the inner wall of the housing of the electrical appliance or to a mounting bracket, the electrical component is wrapped with an adhesive tape and fixed to the inner wall of the housing of the electrical appliance or to the mounting bracket.

[0003] In order to improve the anti-aging performance of the tape, glass fiber tape should also be used.

[0004] The work efficiency is low and the labor cost is high. Since the amount of glass fiber tape used cannot be accurately controlled, the material cost is high. Summary of the invention

[0005] In view of the above problems, the first purpose of the present invention is to provide a foaming hot melt adhesive for electrical appliances to solve the problems of low working efficiency and high manufacturing cost of using tape to fix electrical components.

[0006] The second purpose of the present invention is to provide a method for preparing a foaming hot melt adhesive to improve the solubility of SEBS rubber and improve the environmental friendliness of the preparation process.

[0007] To achieve this object, the present invention adopts the following technical solutions:

[0008] A foaming hot melt adhesive for electrical appliances is sprayed on the bonding points of electrical appliance parts. Calculated by weight percentage, the raw material components of the hot melt adhesive include 30-40% white oil, 25-35% SEBS rubber, 5-10% monomer resin, 15-25% petroleum resin and 0.5-1.0% antioxidant.

[0009] Preferably, when the foaming rate is 40-60%, the adhesion of the hot melt adhesive is not less than 10N / cm 2 .

[0010] Preferably, the monomer resin is α-methylstyrene resin or olefin resin.

[0011] Preferably, the petroleum resin is a partially hydrogenated hydrocarbon resin.

[0012] Preferably, the melt mass flow rate of the SEBS rubber at 230° C. / 5 kg is 5 g / 10 min, and the viscosity of the SEBS rubber at 25° C. is 350-550 Cps.

[0013] Furthermore, the present invention provides a method for preparing a foamable hot melt adhesive, which is used to prepare the foamable hot melt adhesive for electrical appliances, comprising the following steps:

[0014] S1) mixing white oil and SEBS rubber, heating and stirring to obtain a rubber mixture;

[0015] S2) adding monomer resin and petroleum resin to the rubber mixture in sequence, stirring evenly to obtain a jelly;

[0016] S3) filling carbon dioxide or nitrogen into the stirred colloid to foam the colloid to a target foaming rate, adding an antioxidant, stirring evenly, cooling, testing the viscosity and the foaming rate to be qualified, and packaging to obtain the foamable hot melt adhesive.

[0017] Preferably, in step S1), the stirring speed is 30-40 r / m and the temperature is 150-180°C.

[0018] Preferably, in step S2), the stirring speed is 30-50 r / m and the temperature is 140-145° C.;

[0019] In step S3), the temperature is 140-160°C and the qualified viscosity is 3000-6000cps.

[0020] The beneficial effects of the above technical solution of the present invention are as follows: the foaming hot melt adhesive for electrical appliances has better convenience of use, helps to improve work efficiency, and the spraying amount of the foaming adhesive can be achieved by controlling the glue output of the nozzle of the spray gun, which can reduce manufacturing costs.

[0021] Furthermore, the method for preparing the foamable hot melt adhesive proposed by the present invention has a simple process, does not use chemical foaming agents, and is more environmentally friendly. DETAILED DESCRIPTION

[0022] The technical solution of the present invention is further illustrated below through specific implementation methods.

[0023] In the description of this specification, the description with reference to the terms "embodiment", "example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0024] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

[0025] A foaming hot melt adhesive for electrical appliances is sprayed on the bonding points of electrical appliance parts. Calculated by weight percentage, the raw material components of the hot melt adhesive include 30-40% white oil, 25-35% SEBS rubber, 5-10% monomer resin, 15-25% petroleum resin and 0.5-1.0% antioxidant.

[0026] The foamable hot melt adhesive for electrical appliances of the present invention uses white oil as a plasticizer, SEBS rubber as a rubber elastomer, and monomer resin and petroleum resin as tackifiers, and has good bonding properties. When in use, just spray the foamable hot melt adhesive for electrical appliances of the present invention on the bonding location, then press the fixed end of the electrical component on the glue spraying location, and let it stand for 30 minutes. Compared with the glass fiber tape in the prior art, it has better convenience of use, helps to improve work efficiency, and the spraying amount of the foamable adhesive can be achieved by controlling the glue output of the nozzle of the spray gun, which can reduce the manufacturing cost.

[0027] If the amount of white oil used exceeds 40%, the mechanical strength, hardness and tensile stress of the glue will be reduced, and the compatibility of the rubber elastomer rubber of SEBS rubber in the system will be poor, resulting in frosting during spraying and pores on the bonding surface; if the amount of white oil used is less than 30%, it may not be possible to fully increase the distance between SEBS rubber molecules, which will affect the low temperature resistance and flexibility of the glue.

[0028] If the amount of SEBS rubber used exceeds 35%, the overall performance of the glue will be too soft, affecting the fixing effect; if the amount of SEBS rubber used is less than 25%, it will affect the fitting effect and adhesion.

[0029] If the amount of monomer resin used exceeds 10%, it will change the overall physical properties of the glue and affect its adhesion to the bonding surface; if the amount of monomer resin used is less than 5%, the cohesion and peel strength of the glue will be insufficient.

[0030] If the amount of petroleum resin used exceeds 25%, the glue will be too viscous and difficult to spray evenly, affecting the use effect; if the amount of petroleum resin used is less than 15%, the initial adhesion and lasting adhesion will be insufficient, affecting the fixing effect.

[0031] The white oil is preferably Jingmen Petrochemical 68# or Karamay KP6010.

[0032] Preferably, when the foaming rate is 40-60%, the adhesion of the hot melt adhesive is not less than 10N / cm 2 .

[0033] When the foaming rate is 40-60%, the adhesion of the hot melt adhesive to the substrate is not less than 10N / cm 2 , which can ensure the fixing effect of electrical components after bonding.

[0034] Preferably, the monomer resin is α-methylstyrene resin or olefin resin.

[0035] Preferably, Cray Valley W140 alpha methyl styrene resin or Eastman 290 olefin resin is used, which has a high softening point temperature and a low organic volatile content, so that the hot melt adhesive of the present invention has better temperature resistance and environmental protection performance.

[0036] Preferably, the petroleum resin is a partially hydrogenated hydrocarbon resin.

[0037] Preferably, Eastman S5100 hydrocarbon resin is used. Eastman S5100 hydrocarbon resin is a partially hydrogenated thermoplastic resin having excellent cohesive force at room temperature and low viscosity, so that the foaming hot melt adhesive for electrical appliances has better adhesion.

[0038] Preferably, the melt mass flow rate of the SEBS rubber at 230° C. / 5 kg is 5 g / 10 min, and the viscosity of the SEBS rubber at 25° C. is 350-550 Cps.

[0039] The SEBS rubber is preferably made of Kraton 1652 or TSRC 6152, which has good compatibility with white oil and has outstanding temperature resistance and aging resistance.

[0040] The test standard of the above melt mass flow rate is ISO 1133, and the test condition of the above viscosity is Vis, Sol (Toluene) 20.0% w @ 25C.

[0041] Furthermore, the present invention provides a method for preparing a foamable hot melt adhesive, which is used to prepare the foamable hot melt adhesive for electrical appliances, comprising the following steps:

[0042] S1) mixing white oil and SEBS rubber, heating and stirring to obtain a rubber mixture;

[0043] S2) adding monomer resin and petroleum resin to the rubber mixture in sequence, stirring evenly to obtain a jelly;

[0044] S3) filling carbon dioxide or nitrogen into the colloid to foam the colloid to a target foaming rate, adding an antioxidant, cooling, testing the viscosity and the foaming rate to see if they are qualified, and packaging to obtain the foamable hot melt adhesive.

[0045] The preparation method of the foamable hot melt adhesive of the present invention dissolves SEBS rubber in white oil to obtain a rubber mixture with moderate viscosity, then adds monomer resin and petroleum resin to the rubber mixture to form an unfoamed glue semi-finished product, and cools after physical foaming to maintain the foaming rate of the colloid, without using a chemical foaming agent, which is more environmentally friendly.

[0046] The added antioxidant is used to improve the anti-aging performance of the foamable hot melt adhesive at the operating temperature of the electrical appliance, so as to increase the service life of the product. The antioxidant is preferably Rianlon 1010 and / or Rianlon 168.

[0047] Preferably, in step S1), the stirring speed is 30-40 r / m and the temperature is 150-180°C.

[0048] Under low-speed stirring conditions at 150-180°C, the temperature is gradually increased and the SEBS rubber is completely dissolved in the white oil to form a rubber mixture.

[0049] Preferably, in step S2), the stirring speed is 30-50 r / m and the temperature is 140-145° C.;

[0050] In step S3), the temperature is 140-160°C and the qualified viscosity is 3000-6000cps.

[0051] Examples 1-4

[0052] 1. According to the raw material ratio in Table 1, the foamable hot melt adhesive of Examples 1-4 was prepared according to the following steps:

[0053] S1) mixing white oil and SEBS rubber, heating and stirring to obtain a rubber mixture;

[0054] S2) adding monomer resin and petroleum resin to the rubber mixture in sequence, stirring evenly to obtain a jelly;

[0055] S3) filling carbon dioxide or nitrogen into the colloid to foam the colloid to a target foaming rate, adding an antioxidant, cooling, testing the viscosity and foaming rate to be qualified, and packaging to obtain the foamable hot melt adhesive;

[0056] In step S1), the stirring speed is 35r / m and the temperature is 150-180°C;

[0057] In step S2), the stirring speed is 45 r / m and the temperature is 145° C.;

[0058] In step S3), the temperature is 145°C, the qualified viscosity is 4500-5500cps, and the foaming rate is 40-60%;

[0059] The best white oil is Karamay KP6010;

[0060] The monomer resin is Crayville W140 alpha methyl styrene resin or Eastman 290 olefin resin;

[0061] The petroleum resin is Eastman S5100 hydrocarbon resin;

[0062] SEBS rubber is Kraton 1652; antioxidants are Rianlon 1010 and Rianlon 168.

[0063] 2. Use the prepared foaming hot melt adhesive to stick a 1cm*1cm steel plate to a 10cm*10cm cold-rolled plate (substrate) to prepare the corresponding test samples. After standing for 30 minutes, each test sample was placed in an environment of 30°C and 60°C for 4 hours, and then the adhesion between each test sample and the substrate was tested using a tensile testing machine. The test results are shown in Table 1.

[0064] Table 1 Raw material ratio and adhesion test results of Examples 1-4

[0065]

[0066] In summary, the foaming hot melt adhesive for electrical appliances has better ease of use, helps to improve work efficiency, and the spraying amount of the foaming adhesive can be achieved by controlling the glue output of the nozzle of the spray gun, which can reduce manufacturing costs.

[0067] Furthermore, the method for preparing the foamable hot melt adhesive proposed by the present invention has a simple process, does not use chemical foaming agents, and is more environmentally friendly.

[0068] The technical principle of the present invention is described above in conjunction with specific embodiments. These descriptions are only for explaining the principle of the present invention and cannot be interpreted as limiting the scope of protection of the present invention in any way. Based on the explanations herein, those skilled in the art can associate other specific implementations of the present invention without paying creative labor, and these methods will fall within the scope of protection of the present invention.

Claims

1. A foaming hot melt adhesive for electrical appliances, sprayed on the bonding parts of electrical appliances, characterized in that: Calculated by weight percentage, the raw material components of the hot melt adhesive include 30-40% white oil, 25-35% SEBS rubber, 5-10% monomer resin, 15-25% petroleum resin and 0.5-1.0% antioxidant.

2. The foaming hot melt adhesive for electrical appliances according to claim 1, characterized in that: When the foaming rate is 40-60%, the adhesion of the hot melt adhesive is not less than 10N / cm 2 .

3. The foaming hot melt adhesive for electrical appliances according to claim 1, characterized in that: The monomer resin is alpha methyl styrene resin or olefin resin.

4. The foaming hot melt adhesive for electrical appliances according to claim 1, characterized in that: The petroleum resin is a partially hydrogenated hydrocarbon resin.

5. The foaming hot melt adhesive for electrical appliances according to claim 1, characterized in that: The melt mass flow rate of the SEBS rubber at 230° C. / 5 kg is 5 g / 10 min, and the viscosity of the SEBS rubber at 25° C. is 350-550 Cps.

6. A method for preparing a foaming hot melt adhesive, characterized in that: The method for preparing the foamable hot melt adhesive for electrical appliances according to any one of claims 1 to 5 comprises the following steps: S1) mixing white oil and SEBS rubber, heating and stirring to obtain a rubber mixture; S2) adding monomer resin and petroleum resin to the rubber mixture in sequence, stirring evenly to obtain a jelly; S3) filling carbon dioxide or nitrogen into the colloid to foam the colloid to a target foaming rate, adding an antioxidant, testing the viscosity and the foaming rate to see if they are qualified, and packaging to obtain the foamable hot melt adhesive.

7. The method for preparing the foamable hot melt adhesive according to claim 5, characterized in that: In step S1), the stirring speed is 30-40 r / m and the temperature is 150-180°C.

8. The method for preparing the foamable hot melt adhesive according to claim 5, characterized in that: In step S2), the stirring speed is 30-50 r / m and the temperature is 140-145° C.; In step S3), the temperature is 140-160°C and the qualified viscosity is 3000-6000cps.

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