Epoxy-polyurethane composite rubber powder and high-strength wear-resistant compression-resistant preparation method thereof

Abstract

The invention discloses an epoxy-polyurethane composite rubber powder and a high-strength wear-resistant compression-resistant preparation method thereof, and relates to the technical field of epoxy-polyurethane composite rubber powder preparation, and the preparation method comprises the following steps: S1, heating bisphenol A epoxy resin to 80 DEG C, adding a polyurethane dispersion liquid and part of polyvinyl alcohol, stirring for 2 h, and adding a curing agent; adding the rest of polyvinyl alcohol, polyamide curing agent and water, heating to 40-50 DEG C to enable the solid content to be 35-45%, sequentially adding nano silicon dioxide in a stirring state, and uniformly stirring to obtain a mixture B1; s2, the epoxy rubber powder spray liquid B1 is subjected to centrifugal spray drying, and the high-strength, wear-resistant and compression-resistant epoxy rubber powder is obtained.According to the high-strength, wear-resistant and compression-resistant epoxy rubber powder and the preparation method thereof, epoxy resin can make slow contact with a polyamide curing agent through a polyurethane isolation technology, so that the strength of rubber and the strength of mortar are synchronously improved, finally, strength balance is achieved, and the performance is optimized.

Description

Technical Field

[0001] The present invention relates to the technical field of the preparation of epoxy-polyurethane composite rubber powder, and specifically relates to an epoxy-polyurethane composite rubber powder and a preparation method thereof with high strength, wear resistance and compression resistance. Background Art

[0002] Similar to the present invention is a kind of epoxy rubber powder asphalt material and its preparation method. To improve the low-temperature performance of epoxy resin cured materials, high-molecular curing agents, rubber elastomers, plasticizers, etc. are mostly used to improve the flexibility of epoxy resin after curing. However, the compatibility of high-molecular compounds, rubber elastomers and asphalt is poor, resulting in easy segregation of epoxy asphalt. In the present invention, rubber particles are soaked in the hydrolyzed solution of silane coupling agent to obtain surface and interface activated rubber particle curing agent, which is added to matrix asphalt for shearing and cooling, and then modified asphalt, plasticizer, aliphatic dibasic acid, dimer acid or alkyd resin, fatty acid anhydride are added, and epoxy asphalt component B is obtained under the action of a shear emulsifier; epoxy asphalt component A, namely epoxy resin, is mixed and stirred with epoxy asphalt component B to obtain activated rubber particle modified epoxy asphalt material. The present invention significantly improves the low-temperature flexibility performance of epoxy asphalt, and due to the large amount of incorporation of activated rubber particles, the cost of epoxy asphalt is also greatly reduced.

[0003] However, in the modern construction and engineering fields, the performance requirements for materials are getting higher and higher, and this invention is only limited to asphalt materials and may not be applicable to other building materials. Especially in some special environments and high-load conditions, materials with excellent properties such as high strength, wear resistance and compression resistance are required; at present, the rubber powder products on the market often have certain limitations in performance and cannot meet some harsh usage requirements, such as low strength, low compression resistance and poor wear resistance. Therefore, we propose an epoxy-polyurethane composite rubber powder and a preparation method thereof with high strength, wear resistance and compression resistance. Summary of the Invention

[0004] The purpose of the present invention is to provide an epoxy-polyurethane composite rubber powder and a preparation method thereof with high strength, wear resistance and compression resistance, so as to solve the problems raised in the above background art.

[0005] To achieve the above purpose, the present invention provides the following technical solution: An epoxy-polyurethane composite rubber powder, the raw materials of which include the following components in parts by mass: 5-10 parts of bisphenol A epoxy resin, 2-5 parts of polyurethane dispersion, 0.2-1 part of polyamide curing agent, 0.5-3 parts of polyvinyl alcohol, 0.2-1 part of nano-silica and 55-65 parts of water.

[0006] Preferably, the polyurethane dispersion is one or more of polyether polyol, polyester polyol, polycarbonate polyol, isophorone diisocyanate, toluene diisocyanate and N-methyldiethanolamine.

[0007] Preferably, the polyamide curing agent is one or more of a dimer acid and polyamine condensate, a triethylenetetramine condensed polyamide, a diaminodiphenylmethane polyamide adduct, a propylene oxide modified polyamide, and a low molecular weight polyamide.

[0008] Preferably, the bisphenol A type epoxy resin is one or more of bisphenol A diglycidyl ether, brominated bisphenol A type epoxy resin, epichlorohydrin, and phenolic modified bisphenol A type epoxy resin.

[0009] A method for preparing a high-strength, wear-resistant and compression-resistant epoxy-polyurethane composite powder, comprising the following steps: S1. Heat the bisphenol A type epoxy resin to 80 °C, then add the polyurethane dispersion and part of the polyvinyl alcohol, stir for 2 h, then add the remaining polyvinyl alcohol, the polyamide curing agent and water, heat to 40 - 50 °C, so that the solid content is 35 - 45%, and sequentially add nano-silica under stirring to stir evenly to obtain a mixture B1; S2. Spray-dry the epoxy powder spray liquid B1 by centrifugal spray drying to obtain the high-strength, wear-resistant and compression-resistant epoxy powder.

[0010] Preferably, the particle size of the nano-silica is 20 - 50 nm.

[0011] Preferably, the stirring speed of adding nano-silica and stirring in S1 is 800 - 1200 r / min, and the stirring time is 60 - 120 min.

[0012] Preferably, the inlet air temperature of the centrifugal spray drying in S2 is 90 - 130 °C, and the outlet air temperature is 60 - 90 °C.

[0013] Compared with the prior art, the beneficial effects of the present invention are: 1. The polyurethane isolation technology can be used to make the epoxy resin and the polyamide curing agent contact slowly, so that the strength of the glue and the strength of the mortar are improved synchronously, and finally the strength balance is achieved and the performance is optimized. Specific embodiments

[0014] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0015] Example 1

[0016] The invention discloses an epoxy-polyurethane composite rubber powder, wherein the raw materials thereof include the following components by weight: 5-10 parts of double A-type epoxy resin, 2-3 parts of polyurethane dispersion, 0.2-1 parts of polyamide curing agent, 0.5-3 parts of polyvinyl alcohol, 0.2-1 parts of nano silicon dioxide and 55-65 parts of water.

[0017] The particle size of the nano silicon dioxide is 20-50 nm.

[0018] Heat bisphenol A epoxy resin to 80°C, add polyurethane dispersion and part of polyvinyl alcohol, stir for 2h, then add the remaining polyvinyl alcohol, polyamide curing agent and water and heat to 40-50°C to make the solid content 35-45%, add nano-silicon dioxide in sequence while stirring and stir evenly, the stirring speed is 800-1200r / min, and the stirring time is 60-120min to obtain mixture B1.

[0019] The epoxy powder spray liquid B1 is dried by centrifugal spraying, the air inlet temperature needs to be 90-130° C., and the air outlet temperature needs to be 60-90° C., to obtain the high-strength, wear-resistant and pressure-resistant epoxy powder.

[0020] Example 2

[0021] The invention discloses an epoxy-polyurethane composite rubber powder, wherein the raw materials thereof include the following components by weight: 5-10 parts of double A-type epoxy resin, 3-4 parts of polyurethane dispersion, 0.2-1 parts of polyamide curing agent, 0.5-3 parts of polyvinyl alcohol, 0.2-1 parts of nano silicon dioxide and 55-65 parts of water.

[0022] The particle size of the nano silicon dioxide is 20-50 nm.

[0023] Heat bisphenol A epoxy resin to 80°C, add polyurethane dispersion and part of polyvinyl alcohol, stir for 2h, then add the remaining polyvinyl alcohol, polyamide curing agent and water and heat to 40-50°C to make the solid content 35-45%, add nano-silicon dioxide in sequence while stirring and stir evenly, the stirring speed is 800-1200r / min, and the stirring time is 60-120min to obtain mixture B1.

[0024] The epoxy powder spray liquid B1 is dried by centrifugal spraying, the air inlet temperature needs to be 90-130° C., and the air outlet temperature needs to be 60-90° C., to obtain the high-strength, wear-resistant and pressure-resistant epoxy powder.

[0025] Example 3

[0026] An epoxy-polyurethane composite rubber powder, whose raw materials include the following components by mass parts: 5-10 parts of bisphenol A type epoxy resin, 4-5 parts of polyurethane dispersion, 0.2-1 part of polyamide curing agent, 0.5-3 parts of polyvinyl alcohol, 0.2-1 part of nano-silica, and 55-65 parts of water.

[0027] The particle size of the nano-silica is 20-50nm.

[0028] Heat the bisphenol A type epoxy resin to 80°C, then add the polyurethane dispersion and part of the polyvinyl alcohol, stir for 2h, and then add the remaining polyvinyl alcohol, polyamide curing agent and water and heat to 40-50°C to make the solid content 35-45%. Add nano-silica in sequence under stirring and stir evenly. The stirring speed is 800-1200r / min and the stirring time is 60-120min to obtain mixture B1.

[0029] Centrifugally spray-dry the epoxy rubber powder spray liquid B1. The inlet air temperature needs to be 90-130°C and the outlet air temperature needs to be 60-90°C to obtain the high-strength, wear-resistant and compression-resistant epoxy rubber powder.

[0030] The performance tests for Example 1, Example 2 and Example 3 are as follows: (The blank is adding ordinary VAE rubber powder)

[0031] It can be seen from the above table that the highest increase rate of the bonding strength is 60%, the highest increase rate of the compressive strength is 11.9%, and the wear resistance is increased by 55%.

[0032] Perform performance tests on the high-strength, wear-resistant and compression-resistant epoxy rubber powder prepared in the above embodiments. The results show that the epoxy rubber powder of the present invention has excellent high strength, wear resistance and compression resistance and can meet various harsh use conditions.

[0033] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the term "comprises", "comprising" or any other variation thereof is intended to cover a non-exclusive inclusion, such that a process, method, article or device comprising a series of elements includes not only those elements, but also other elements not expressly listed, or elements inherent to such process, method, article or device.

[0034] Although embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An epoxy-polyurethane composite rubber powder, characterized in that, Its raw materials include the following components by mass parts: 5-10 parts of bisphenol A epoxy resin, 2-5 parts of polyurethane dispersion, 0.2-1 part of polyamide curing agent, 0.5-3 parts of polyvinyl alcohol, 0.2-1 part of nano-silica, and 55-65 parts of water.

2. The epoxy-polyurethane composite rubber powder according to claim 1, wherein: The polyurethane dispersion is one or more of polyether polyol, polyester polyol, polycarbonate polyol, isophorone diisocyanate, toluene diisocyanate, and N-methyldiethanolamine.

3. The epoxy-polyurethane composite rubber powder according to claim 1, wherein: The polyamide curing agent is one or more of the condensate of dimer acid and polyamine, triethylenetetramine condensed polyamide, diaminodiphenylmethane polyamide adduct, epoxy propane modified polyamide, and low molecular weight polyamide.

4. The epoxy-polyurethane composite rubber powder according to claim 1, characterized in that: The bisphenol A epoxy resin is one or more of bisphenol A diglycidyl ether, brominated bisphenol A epoxy resin, epichlorohydrin, and phenol-formaldehyde modified bisphenol A epoxy resin.

5. A method for preparing high-strength, wear-resistant and compression-resistant epoxy-polyurethane composite rubber powder, characterized in that: It includes the following steps: S1. Heat the bisphenol A epoxy resin to 80 °C, then add the polyurethane dispersion liquid and part of the polyvinyl alcohol, stir for 2 h, then add the remaining polyvinyl alcohol, polyamide curing agent, and water, heat to 40-50 °C to make the solid content 35-45%, and sequentially add nano-silica under stirring to stir evenly to obtain mixture B1; S2. Spray-dry the epoxy powder spray liquid B1 by centrifugal spray drying to obtain the high-strength wear-resistant and compression-resistant epoxy powder.

6. The high-strength, wear-resistant and compression-resistant preparation method of an epoxy-polyurethane composite rubber powder according to claim 5, characterized in that: The particle size of the nano-silica is 20-50 nm.

7. The high-strength, wear-resistant and compression-resistant preparation method of an epoxy-polyurethane composite rubber powder according to claim 6, characterized in that: The stirring speed of adding nano-silica in S1 is 800-1200 r / min, and the stirring time is 60-120 min.

8. The high-strength, wear-resistant and compression-resistant preparation method of an epoxy-polyurethane composite rubber powder according to claim 7, characterized in that: The inlet air temperature of centrifugal spray drying in S2 is 90-130 °C, and the outlet air temperature is 60-90 °C.

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