A kind of sealant and preparation method thereof

Abstract

The present invention belongs to the technical field of sealants, and specifically relates to a sealant and a preparation method thereof. The sealant of the present invention is mainly composed of the following raw materials in parts by weight: 100-110 parts of polyacrylate emulsion, 2-4 parts of silane coupling agent, 5-20 parts of plasticizer, 4-6 parts of tackifying resin, 100-110 parts of filler, 0.5-10 parts of pH regulator and 1-20 parts of auxiliary agent. The tackifying resin is added to the polyacrylate emulsion, and the synergistic effect with the silane coupling agent and the plasticizer increases the cohesive strength and elasticity of the colloid, breaking through the highest level 12.5E level in the industry standard JC / 484-2006 "Acrylic Ester Building Sealant" to 20HM level, the elastic recovery rate is increased from 40% to more than 60%, and the tensile modulus is more than 0.6mpa at 23°C, which not only ensures the elasticity of the colloid, but also increases the bonding strength; it can be used in civil buildings other than curtain walls, reducing pollution and reducing construction costs.

Description

Technical Field

[0001] The invention belongs to the technical field of sealants, and in particular relates to a sealant and a preparation method thereof. Background Art

[0002] Acrylic building sealants have a wide range of raw materials, are non-toxic and harmless, are easy to prepare, and are widely used in various types of buildings. However, due to the low cohesive strength and poor elasticity of polyacrylate emulsions, their use conditions are limited. Therefore, increasing the cohesive strength and enhancing its elasticity to meet the mechanical performance requirements of various buildings and expand the product's scope of application is a new topic for this type of product. Summary of the invention

[0003] The present invention provides a sealant, which overcomes the shortcomings of the polyacrylate sealant produced by the prior art, such as low cohesive strength, poor elasticity, low tensile modulus and inability to be used for sealing of building joints with large displacement, by adding a tackifying resin into the polyacrylate.

[0004] The present invention is achieved through the following technical solutions:

[0005] In a first aspect, the present invention provides a sealant, which is mainly composed of the following raw materials in parts by weight:

[0006] 100-110 parts of polyacrylate emulsion, 2-4 parts of silane coupling agent, 5-20 parts of plasticizer, 4-6 parts of tackifying resin, 100-110 parts of filler, 0.5-10 parts of pH regulator and 1-20 parts of auxiliary agent.

[0007] Furthermore, in a preferred embodiment of the present invention, the above-mentioned tackifying resin is at least one of rosin, rosin-modified resin, petroleum resin, pine tar, terpene resin, terpene-modified resin, liquid coumarone, xylene formaldehyde resin and tert-butyl phenolic resin.

[0008] Further, in a preferred embodiment of the present invention, the plasticizer comprises methyl chloropalmitate and polybutene;

[0009] The molecular weight of the polybutene is 600-1300.

[0010] Furthermore, in a preferred embodiment of the present invention, the filler comprises heavy calcium carbonate.

[0011] Furthermore, in a preferred embodiment of the present invention, the above-mentioned auxiliary agent includes a dispersant, a wetting agent and a formaldehyde scavenger.

[0012] Furthermore, in a preferred embodiment of the present invention, the wetting agent includes nonylphenol polyoxyethylene ether.

[0013] In a second aspect, the present invention provides a method for preparing a sealant, the preparation method comprising the following steps:

[0014] Add polyacrylate emulsion, silane coupling agent, plasticizer and tackifying resin into a container in proportion, and stir evenly to obtain a mixed solution a;

[0015] Adding a pH regulator in proportion to the mixed solution a and stirring to obtain a mixed solution b;

[0016] After adding fillers in proportion to the mixed solution b and stirring evenly, a sealant is obtained.

[0017] Furthermore, in a preferred embodiment of the present invention, the pH of the mixed solution b is 7-8.

[0018] Furthermore, in a preferred embodiment of the present invention, the temperature is controlled at 40-50°C during the stirring process after the filler is added. The temperature increase during the stirring process helps the organic solvent to form gas.

[0019] Furthermore, the mixed gas in the stirring kettle was pumped out by a water ring vacuum pump to an organic gas processor for recycling for 20 minutes with a vacuum degree of 0.08 MPa.

[0020] Compared with the prior art, the present invention has at least the following technical effects:

[0021] The sealant of the present invention overcomes the disadvantages of low cohesive strength, poor elasticity, low tensile modulus, and inability to be used for sealing of large displacement buildings of polyacrylate sealants produced by prior art by adding tackifying resin to polyacrylate. The addition of tackifying resin can increase the cohesive strength and elasticity of the colloid, breaking through the highest level 12.5E level in the industry standard JC / 484-2006 "Acrylic Ester Building Sealant" and increasing it to 20HM level, increasing the elastic recovery rate from 40% to more than 60%, and the tensile modulus at 23°C reaching more than 0.6 MPa, which not only ensures the elasticity of the colloid, but also increases the bonding strength; it can be used in civil buildings other than curtain walls, reducing pollution and lowering construction costs. DETAILED DESCRIPTION

[0022] The embodiments of the present invention will be described in detail below in conjunction with examples. However, those skilled in the art will understand that the following examples are only used to illustrate the present invention and should not be construed as limiting the scope of the present invention. The specific conditions not specified in the examples are carried out according to conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used without indicating the manufacturer are all conventional products that can be purchased commercially.

[0023] The overall idea of ​​the technical solution of the specific implementation mode of the present invention is:

[0024] In a first aspect, the present invention provides a sealant, which is mainly composed of the following raw materials in parts by weight:

[0025] 100-110 parts of polyacrylate emulsion, 2-4 parts of silane coupling agent, 5-20 parts of plasticizer, 4-6 parts of tackifying resin, 100-110 parts of filler, 0.5-10 parts of pH regulator and 1-20 parts of auxiliary agent.

[0026] The addition of tackifying resin to the polyacrylate emulsion, together with the synergistic effect of silane coupling agent and plasticizer, increases the cohesive strength and elasticity of the colloid, breaking through the maximum elastic recovery rate of ≥40% in JC / 484-2006 "Acrylic Ester Building Sealant", raising it by one level and reaching an elastic recovery rate of 60%. It can be used in civil buildings other than curtain walls, reducing pollution and lowering construction costs.

[0027] Furthermore, the above-mentioned tackifying resin is at least one of rosin, rosin-modified resin, petroleum resin, pine tar, terpene resin, terpene-modified resin, liquid coumarone, xylene formaldehyde resin and tert-butyl phenolic resin.

[0028] Furthermore, the above-mentioned tackifying resin raw material may be solid or liquid.

[0029] Liquid tackifying resins are liquid coumarone, liquid rosin and pine tar.

[0030] When solid tackifying resins such as solid rosin, rosin-modified resins, petroleum resins, terpene resins, terpene-modified resins, xylene formaldehyde resins and tert-butylphenol-formaldehyde resins are used as the tackifying resin raw materials, the tackifying resins need to be dissolved into liquids before preparing the sealant.

[0031] Furthermore, the solvent for dissolving the tackifying resin is at least one of No. 120 solvent oil, styrene and turpentine. The above solvent has little pollution to the environment and has a good dissolving ability for the viscous resin.

[0032] Further, the plasticizer includes methyl chloropalmitate and polybutene;

[0033] The above plasticizers can make the sealant have good flexibility and low temperature performance.

[0034] The molecular weight of the polybutene is 600-1300; the polybutene with a molecular weight in this range is in liquid form, which is convenient for feeding and dispersion.

[0035] Furthermore, the filler includes heavy calcium carbonate, which is not only cheap but also has appropriate strength and hiding power.

[0036] Furthermore, in a preferred embodiment of the present invention, the above-mentioned auxiliary agent includes a dispersant, a wetting agent and a formaldehyde scavenger.

[0037] The addition of dispersants can better disperse the raw materials evenly and avoid agglomeration. The addition of dispersants can completely depolymerize the secondary particles in the filler in the system and disperse them into primary particles (original particles), maintaining a state of no longer agglomerating. By adding wetting agents, the wettability of water to fillers and pigments in the system is improved, maintaining the stability of the system dispersion. Using formaldehyde scavengers as auxiliary agents can effectively absorb and decompose residual formaldehyde in the system, reducing pollution to the environment.

[0038] Furthermore, in a preferred embodiment of the present invention, the wetting agent includes nonylphenol polyoxyethylene ether.

[0039] In a second aspect, the present invention provides a method for preparing a sealant, the preparation method comprising the following steps:

[0040] Add polyacrylate emulsion, silane coupling agent, plasticizer and tackifying resin into a container in proportion, and stir evenly to obtain a mixed solution a;

[0041] Adding a pH regulator in proportion to the mixed solution a and stirring to obtain a mixed solution b;

[0042] After adding fillers in proportion to the mixed solution b and stirring evenly, a sealant is obtained.

[0043] Furthermore, the pH of the mixed solution b is 7.5-8, which makes the system weakly alkaline and increases the storage stability of the product.

[0044] Furthermore, the temperature during the stirring process after adding the filler is controlled to be 40-50° C. Its function is to reduce the viscosity of the system, so that various raw materials can be better dispersed and mixed, and it helps the organic solvent to form gas.

[0045] Furthermore, the tackifying resin can be dissolved in a solvent, which allows the tackifying resin to be easily added to the acrylic emulsion and dispersed in the system under stirring.

[0046] Furthermore, when the tackifying resin is dissolved in a solvent, the weight ratio of the tackifying resin to the solvent is 5:(0.5-2).

[0047] Furthermore, in the obtained mixed solution a, the raw materials are preferably added one by one every 3-5 minutes, and stirred continuously to ensure the uniformity of the mixed solution.

[0048] The specific embodiments of the present invention are described in detail below. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0049] Example 1

[0050] This embodiment provides a sealant, wherein the sealant includes the following components in parts by weight:

[0051] Polyacrylate emulsion 100g; chloropalm oil methyl ester 8g; polybutene 3g; dispersant 1.5g; wetting agent 1.5g; formaldehyde scavenger 0.25g; pH adjuster Amp95 0.75g; heavy calcium carbonate (1250 mesh) 100g; silane coupling agent KH-550 4g; liquid coumarone resin 5g;

[0052] The present embodiment provides a preparation step of a sealant as follows:

[0053] Add polyacrylate emulsion into a stirring kettle with stirring and vacuuming function, add chloropalm oil methyl ester, silane coupling agent KH-550, polybutene, dispersant, wetting agent, formaldehyde scavenger, pH adjuster Amp95 and liquid coumarone in sequence every 5 minutes under stirring, adjust pH value to 7.5-8 with Amp95, add heavy calcium carbonate after stirring for 15 minutes, heat to 45°C and then use a water ring vacuum pump to pump the mixed gas in the kettle into the organic gas processor for 20 minutes with a vacuum degree of 0.08Mpa, and remove the bubbles to obtain the sealant.

[0054] Example 2

[0055] This embodiment provides a sealant, wherein the sealant includes the following components in parts by weight:

[0056] Polyacrylate emulsion 100g; chloropalm oil methyl ester 8g; polybutene 7g; dispersant 1.5g; wetting agent 2g; formaldehyde scavenger 0.25g; pH adjuster Amp95 0.75g; liquid rosin 5g; heavy calcium carbonate (1250 mesh) 100g; silane coupling agent KH-550 4g;

[0057] The present embodiment provides a preparation step of a sealant as follows:

[0058] Put the acrylic emulsion into a sealed stirring kettle, add chloromethyl palm oil, silane coupling agent KH-550, polybutene, dispersant, wetting agent, formaldehyde scavenger and liquid rosin in turn every 5 minutes, adjust the pH value to 8 with Amp95, add heavy calcium carbonate after stirring for 15 minutes, raise the temperature to 40°C, use a water ring vacuum pump to pump the mixed gas in the kettle into the organic gas processor for 20 minutes, the vacuum degree is 0.08Mpa, and the sealant is obtained after removing the bubbles.

[0059] Example 3

[0060] This embodiment provides a sealant, wherein the sealant includes the following components in parts by weight:

[0061] Polyacrylate emulsion 110g; chloropalm oil methyl ester 10g; polybutene 9g; dispersant 2g; wetting agent 3g; formaldehyde scavenger 0.5g; pH adjuster Amp95 1.5g; pine tar 5g, heavy calcium carbonate (1250 mesh) 105g; silane coupling agent KH-550 4g;

[0062] The present embodiment provides a preparation step of a sealant as follows:

[0063] Put the acrylic emulsion into a sealed stirring kettle, add chloromethyl palm oil, silane coupling agent KH-550, polybutene, dispersant, wetting agent, formaldehyde scavenger, pine tar in turn every 5 minutes, adjust the pH value to 7.5-8 with Amp95, add heavy calcium carbonate after stirring for 15 minutes, raise the temperature to 49°C, use a water ring vacuum pump to pump the mixed gas in the kettle into the organic gas processor for 20 minutes, the vacuum degree is 0.08Mpa, and the sealant is obtained after removing the bubbles.

[0064] Example 4

[0065] This embodiment provides a sealant, wherein the sealant includes the following components in parts by weight:

[0066] Polyacrylate emulsion 105g; chloropalm oil methyl ester 6g; polybutene 7g; dispersant 1g; wetting agent 1g; formaldehyde scavenger 1g; pH adjuster Amp95 0.75g; styrene 3g; 120 solvent oil 3g;

[0067] Solid coumarone resin 6g; heavy calcium carbonate (1250 mesh) 100g; silane coupling agent KH-550 4g;

[0068] The present embodiment provides a preparation step of a sealant as follows:

[0069] First, the styrene and No. 120 solvent oil are mixed in a container with a stirring function to form a mixed liquid, and then solid coumarone resin is added into a stirring kettle to dissolve to form liquid B;

[0070] Then put the acrylic emulsion into a sealed stirring kettle, add chloromethyl palm oil, silane coupling agent KH-550, polybutene, dispersant, wetting agent, formaldehyde scavenger, and liquid B in turn every 5 minutes, adjust the pH value to 7.5-8 with Amp95, stir for 15 minutes, add heavy calcium carbonate, heat to 45°C (control the temperature below 50°C), use a water ring vacuum pump to pump the mixed gas in the kettle into the organic gas processor for 20 minutes, and the vacuum degree is 0.08Mpa. After removing the bubbles, the sealant is obtained.

[0071] Example 5

[0072] This embodiment provides a sealant, wherein the sealant includes the following components in parts by weight:

[0073] Polyacrylate emulsion 100g; chloropalm oil methyl ester 8g; polybutene 3g; dispersant 1.5g; wetting agent 1.5g; formaldehyde scavenger 0.25g; pH adjuster Amp95 0.75g; 120 solvent oil 5g; rosin 5g; heavy calcium carbonate (1250 mesh) 100g; silane coupling agent KH-550 4g;

[0074] The present embodiment provides a preparation step of a sealant as follows:

[0075] First, put the No. 120 solvent oil in a container with a stirring function, and then put the rosin into a stirring kettle to dissolve it to form liquid B;

[0076] Then put the acrylic emulsion into a sealed stirring kettle, and add chloromethyl palm oil, silane coupling agent KH-550, polybutene, dispersant, wetting agent, formaldehyde scavenger, and liquid B in turn every 5 minutes. Use Amp95 to adjust the pH value to 7.5-8, stir for 15 minutes, add heavy calcium carbonate, raise the temperature to 45°C, and use a water ring vacuum pump to pump the mixed gas in the kettle into the organic gas processor for 20 minutes at a vacuum degree of 0.08Mpa. After removing the bubbles, the sealant is obtained.

[0077] Example 6

[0078] This embodiment provides a sealant, wherein the sealant includes the following components in parts by weight:

[0079] Polyacrylate emulsion 110g; chloropalm oil methyl ester 10g; polybutene 7g; dispersant 2g; wetting agent 2g; formaldehyde scavenger 1.5g; pH adjuster Amp95 1g; 120 solvent oil 7g; hydrogenated rosin 5g; heavy calcium carbonate (1250 mesh) 110g; silane coupling agent KH-550 4g;

[0080] The present embodiment provides a preparation step of a sealant as follows:

[0081] First, put the No. 120 solvent oil in a container with a stirring function, and then put the hydrogenated rosin into a stirring kettle to dissolve to form liquid B;

[0082] Then put the acrylic emulsion into a sealed stirring kettle, add chloropalm oil methyl ester, silane coupling agent KH-550, polybutene, dispersant, wetting agent, formaldehyde scavenger, and liquid B in turn every 5 minutes, adjust the pH value to 7.5-8 with Amp95, add heavy calcium carbonate after stirring for 15 minutes, raise the temperature to 45°C, and use a water ring vacuum pump to pump the mixed gas in the kettle into the organic gas processor for 20 minutes with a vacuum degree of 0.08Mpa. After removing the bubbles, the sealant is obtained.

[0083] Example 7

[0084] This embodiment provides a sealant, wherein the sealant includes the following components in parts by weight:

[0085] Polyacrylate emulsion 100g; chloropalm oil methyl ester 10g; polybutene 5g; dispersant 1g; wetting agent 1.5g; formaldehyde scavenger 1g; pH adjuster Amp95 0.75g; 120 solvent oil 5g; glycerol rosin 5g; heavy calcium carbonate (1250 mesh) 100g; silane coupling agent KH-550 4g;

[0086] The present embodiment provides a preparation step of a sealant as follows:

[0087] First, put the No. 120 solvent oil in a container with a stirring function, and then put the glycerol rosin into a stirring kettle to dissolve to form liquid B;

[0088] Then put the acrylic emulsion into a sealed stirring kettle, add chloromethyl palm oil, silane coupling agent KH-550, polybutene, dispersant, wetting agent, formaldehyde scavenger, and liquid B in turn every 5 minutes, adjust the pH value to 7.5-8 with Amp95, add heavy calcium carbonate after stirring for 15 minutes, raise the temperature to ≥48°C, and use a water ring vacuum pump to pump the mixed gas in the kettle into the organic gas processor for 20 minutes with a vacuum degree of 0.08Mpa. After removing the bubbles, the sealant is obtained.

[0089] Example 8

[0090] This embodiment provides a sealant, wherein the sealant includes the following components in parts by weight:

[0091] Polyacrylate emulsion 105g; chloropalm oil methyl ester 8g; polybutene 6g; dispersant 1.5g; wetting agent 1.5g; formaldehyde scavenger 0.5g; pH adjuster Amp95 1.5g; 120 solvent oil 5g; C9 petroleum resin 5g; heavy calcium carbonate (1250 mesh) 100g; silane coupling agent KH-550 4g;

[0092] The present embodiment provides a preparation step of a sealant as follows:

[0093] First, put the No. 120 solvent oil in a container with a stirring function, and then put the C9 petroleum resin into a stirring kettle to dissolve and prepare liquid B;

[0094] Then put the acrylic emulsion into a sealed stirring kettle, and add chloromethyl palm oil, silane coupling agent KH-550, polybutene, dispersant, wetting agent, formaldehyde scavenger, and liquid B in turn every 5 minutes. Use Amp95 to adjust the pH value to 7.5-8, stir for 15 minutes, add heavy calcium carbonate, raise the temperature to 48°C, and continue to use a water ring vacuum pump to pump the mixed gas in the kettle into the organic gas processor for 20 minutes at a vacuum degree of 0.08Mpa. After removing the bubbles, the sealant is obtained.

[0095] Example 9

[0096] This embodiment provides a sealant, wherein the sealant includes the following components in parts by weight:

[0097] Polyacrylate emulsion 103g; chloropalm oil methyl ester 8g; polybutene 4g; dispersant 1.5g; wetting agent 1.5g; formaldehyde scavenger 0.25g; pH adjuster Amp95 0.75g; 120 solvent oil 5g; C5 petroleum resin 5g; heavy calcium carbonate (1250 mesh) 100g; silane coupling agent KH-550 4g;

[0098] The present embodiment provides a preparation step of a sealant as follows:

[0099] First, put the No. 120 solvent oil in a container with a stirring function, and then put the C5 petroleum resin into a stirring kettle to dissolve and prepare liquid B;

[0100] Then put the acrylic emulsion into a sealed stirring kettle, add chloropalm oil methyl ester, silane coupling agent KH-550, polybutene, dispersant, wetting agent, formaldehyde scavenger, and liquid B in turn every 5 minutes, adjust the pH value to 7.5-8 with Amp95, add heavy calcium carbonate after stirring for 15 minutes, raise the temperature to 45°C, and use a water ring vacuum pump to pump the mixed gas in the kettle into the organic gas processor for 20 minutes with a vacuum degree of 0.08Mpa. After removing the bubbles, the sealant is obtained.

[0101] Example 10

[0102] This embodiment provides a sealant, wherein the sealant includes the following components in parts by weight:

[0103] 105 g of polyacrylate emulsion; 10 g of chlorinated methyl palmitate; 4 g of polybutene; 1.5 g of dispersant; 1.5 g of wetting agent; 0.5 g of formaldehyde scavenger; 1 g of pH regulator Amp95; 5 g of 120 solvent oil; 5 g of C5 and C9 copolymerized petroleum resin; 100 g of heavy calcium carbonate (1250 mesh); 4 g of silane coupling agent KH-550;

[0104] This example provides a preparation step of a sealant as follows:

[0105] First, put the 120 solvent oil in a container with stirring function, and then put the C5 and C9 copolymerized petroleum resin into the stirring kettle to dissolve and make solution B;

[0106] Then put the acrylate emulsion into a sealed stirring kettle, and add chlorinated methyl palmitate, silane coupling agent KH-550, polybutene, dispersant, wetting agent, formaldehyde scavenger, solution B in turn every 5 minutes, adjust the PH value to 7.5 - 8 with Amp95, stir for 15 minutes and then add heavy calcium carbonate, heat up to ≥40 °C (control the temperature below 50 °C), use a water ring vacuum pump to pump the mixed gas in the kettle into the organic gas processor for 20 minutes, with a vacuum degree of 0.08 Mpa, and obtain the sealant after removing bubbles.

[0107] Example 11

[0108] This example provides a sealant, and the sealant includes the following components in parts by mass:

[0109] 103 g of polyacrylate emulsion; 9 g of chlorinated methyl palmitate; 5 g of polybutene; 1 g of dispersant; 2 g of wetting agent; 0.5 g of formaldehyde scavenger; 1 g of pH regulator Amp95; 2 g of 120 solvent oil; 4 g of turpentine; 2 of styrene; 5 of xylene formaldehyde resin; 100 of heavy calcium carbonate (1250 mesh); 4 g of silane coupling agent KH-550;

[0110] This example provides a preparation step of a sealant as follows:

[0111] First, make a mixed solution of the styrene, 120 solvent oil and turpentine in a container with stirring function, and then put the xylene formaldehyde resin into the stirring kettle to dissolve and make solution B;

[0112] Then put the acrylic emulsion into a sealed stirring kettle, add chloropalm oil methyl ester, silane coupling agent KH-550, polybutene, dispersant, wetting agent, formaldehyde scavenger, and liquid B in turn every 5 minutes, adjust the pH value to 7.5-8 with Amp95, stir for 15 minutes, add heavy calcium carbonate, raise the temperature to ≥40°C (control the temperature below 50°C), and use a water ring vacuum pump to pump the mixed gas in the kettle into the organic gas processor for 20 minutes at a vacuum degree of 0.08Mpa. After removing the bubbles, the sealant is obtained.

[0113] Example 12

[0114] This embodiment provides a sealant, wherein the sealant includes the following components in parts by weight:

[0115] Polyacrylate emulsion 101g; chloropalm oil methyl ester 8g; polybutene 3g; dispersant 1.5g; wetting agent 1.5g; formaldehyde scavenger 0.25g; pH adjuster Amp95 0.75g; 120 solvent oil 2g; turpentine 1g; styrene 2g; tert-butyl phenolic resin 5g; heavy calcium carbonate (1250 mesh) 100; silane coupling agent KH-550 2g;

[0116] The present embodiment provides a preparation step of a sealant as follows:

[0117] First, the styrene and No. 120 solvent oil are mixed in a container with a stirring function to form a mixed liquid, and then tert-butyl phenolic resin is added into a stirring kettle to dissolve to form liquid B;

[0118] Then put the acrylic emulsion into a sealed stirring kettle, add chloropalm oil methyl ester, silane coupling agent KH-550, polybutene, dispersant, wetting agent, formaldehyde scavenger, and liquid B in turn every 5 minutes, adjust the pH value to 7.5-8 with Amp95, stir for 15 minutes, add heavy calcium carbonate, raise the temperature to ≥40°C (control the temperature below 50°C), and use a water ring vacuum pump to pump the mixed gas in the kettle into the organic gas processor for 20 minutes at a vacuum degree of 0.08Mpa. After removing the bubbles, the sealant is obtained.

[0119] Example 13

[0120] This embodiment provides a sealant, wherein the sealant includes the following components in parts by weight:

[0121] Polyacrylate emulsion 101g; chloropalm oil methyl ester 8g; polybutene 3g; dispersant 1.5g; wetting agent 1.5g; formaldehyde scavenger 0.25g; pH adjuster Amp95 0.75g; 120 solvent oil 2g; turpentine 1g; styrene 2g; C9 petroleum resin 2.5g; solid coumarone resin 2.5g; heavy calcium carbonate (1250 mesh) 100; silane coupling agent KH-550 4g;

[0122] The present embodiment provides a preparation step of a sealant as follows:

[0123] First, the styrene, turpentine and No. 120 solvent oil are mixed in a container with a stirring function to form a mixed liquid, and then C9 petroleum resin and solid coumarone resin are added into a stirring kettle to dissolve to form liquid B;

[0124] Then put the acrylic emulsion into a sealed stirring kettle, add chloropalm oil methyl ester, silane coupling agent KH-550, polybutene, dispersant, wetting agent, formaldehyde scavenger, and liquid B in turn every 5 minutes, adjust the pH value to 7.5-8 with Amp95, stir for 15 minutes, add heavy calcium carbonate, raise the temperature to ≥40°C (control the temperature below 50°C), and use a water ring vacuum pump to pump the mixed gas in the kettle into the organic gas processor for 20 minutes at a vacuum degree of 0.08Mpa. After removing the bubbles, the sealant is obtained.

[0125] Embodiment 14

[0126] This embodiment provides a sealant, wherein the sealant includes the following components in parts by weight:

[0127] Polyacrylate emulsion 101g; chloropalm oil methyl ester 8g; polybutene 3g; dispersant 1.5g; wetting agent 1.5g; formaldehyde scavenger 0.25g; pH adjuster Amp95 0.75g; 120 solvent oil 2g; turpentine 1g; styrene 2g; xylene formaldehyde resin 2g; C5 petroleum resin 3g; heavy calcium carbonate (1250 mesh) 100; silane coupling agent KH-550 4g;

[0128] The present embodiment provides a preparation step of a sealant as follows:

[0129] First, the styrene, turpentine and No. 120 solvent oil are mixed in a container with a stirring function to form a mixed liquid, and then xylene formaldehyde resin and C5 petroleum resin are added into a stirring kettle to dissolve to form liquid B;

[0130] Then put the acrylic emulsion into a sealed stirring kettle, add chloropalm oil methyl ester, silane coupling agent KH-550, polybutene, dispersant, wetting agent, formaldehyde scavenger, and liquid B in turn every 5 minutes, adjust the pH value to 7.5-8 with Amp95, stir for 15 minutes, add heavy calcium carbonate, raise the temperature to ≥40°C (control the temperature below 50°C), and use a water ring vacuum pump to pump the mixed gas in the kettle into the organic gas processor for 20 minutes at a vacuum degree of 0.08Mpa. After removing the bubbles, the sealant is obtained.

[0131] Embodiment 15

[0132] This embodiment provides a sealant, wherein the sealant includes the following components in parts by weight:

[0133] Polyacrylate emulsion 101g; chloropalm oil methyl ester 8g; polybutene 3g; dispersant 1.5g; wetting agent 1.5g; formaldehyde scavenger 0.25g; pH adjuster Amp95 0.75g; 120 solvent oil 2g; turpentine 1g; styrene 2g; tert-butyl phenolic resin 2g; C5 petroleum resin 1.5g; solid coumarone resin 1.5g; heavy calcium carbonate (1250 mesh) 100; silane coupling agent KH-5504g;

[0134] The present embodiment provides a preparation step of a sealant as follows:

[0135] First, the styrene, turpentine and No. 120 solvent oil are mixed in a container with a stirring function to form a mixed liquid, and then tert-butyl phenolic resin, C5 petroleum resin and solid coumarone resin are added into a stirring kettle to dissolve to form liquid B;

[0136] Then put the acrylic emulsion into a sealed stirring kettle, add chloromethyl palm oil, silane coupling agent KH-550, polybutene, dispersant, wetting agent, formaldehyde scavenger, and liquid B in turn every 5 minutes, adjust the pH value to 7.5-8 with Amp95, stir for 15 minutes, add heavy calcium carbonate, and heat to ≥40℃

[0137] (Control the temperature below 50°C) Use a water ring vacuum pump to pump the mixed gas in the kettle into the organic gas processor for 20 minutes, with a vacuum degree of 0.08Mpa. After removing the bubbles, the sealant is obtained.

[0138] Example 16

[0139] This embodiment provides a sealant, wherein the sealant includes the following components in parts by weight:

[0140] Polyacrylate emulsion 101g; chloropalm oil methyl ester 8g; polybutene 3g; dispersant 1.5g; wetting agent 1.5g; formaldehyde scavenger 0.25g; pH adjuster Amp95 0.75g; 120 solvent oil 2g; turpentine 1g; styrene 1g; pine tar 1g; xylene formaldehyde resin 2g; aromatic modified terpene resin 2g heavy calcium carbonate (1250 mesh) 100; silane coupling agent KH-550 4g;

[0141] The present embodiment provides a preparation step of a sealant as follows:

[0142] First, the styrene, turpentine and No. 120 solvent oil are mixed in a container with a stirring function.

[0143] Mix the liquid, then put xylene formaldehyde resin and aromatic modified terpene resin into the stirring kettle to dissolve and prepare liquid B; then put the acrylic emulsion into the sealed stirring kettle, add chloropalm oil methyl ester, silane coupling agent KH-550, polybutene, dispersant, wetting agent, formaldehyde scavenger, liquid B, pine tar oil in sequence every 5 minutes, adjust the pH value to 7.5-8 with Amp95, stir for 15 minutes, add heavy calcium carbonate, heat to ≥40℃ (control the temperature below 50℃), use a water ring vacuum pump to pump the mixed gas in the kettle into the organic gas processor, the time is 20 minutes, the vacuum degree is 0.08Mpa, and the sealant is obtained after the bubbles are removed.

[0144] Experimental example:

[0145] In order to illustrate that the sealant provided by the present application has durability and elastic recovery rate effect, the following experiment is conducted:

[0146] Test method: The durability performance method is GB / T35609-2017 B, 11.4

[0147] The durability test result should be non-destructive.

[0148] The elastic recovery rate test method adopts GB / T 13477.17-2002

[0149] The tensile adhesion test method adopts: GB / T 13477.8-2002

[0150] The test method for fixed-strength adhesion is: GB / T 13477.10-2002

[0151] The test method for the fixed elongation and adhesion after immersion in water is: GB / T 13477.11-2002

[0152] The free formaldehyde test method is based on the provisions of 5.1 in GB / T30982-2014.

[0153] The total volatile organic compound test method is based on the provisions of Appendix F of GB18583-2008.

[0154] The physical and mechanical indicators and harmful substance limit results of Examples 1-12 are shown in Table 1-3;

[0155] Table 1

[0156]

[0157] Table 2

[0158]

[0159]

[0160] Table 3

[0161]

[0162] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the protection scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A sealant, It is characterized in that The sealant is mainly composed of the following raw materials in parts by weight: 100-110 parts of polyacrylate emulsion, 2-4 parts of silane coupling agent, 5-20 parts of plasticizer, 4-6 parts of tackifying resin, 100-110 parts of filler, 0.5-10 parts of pH regulator and 1-20 parts of auxiliary agent; The tackifying resin is at least one of rosin, rosin-modified resin, petroleum resin, pine tar, terpene resin, terpene-modified resin, liquid coumarone, xylene formaldehyde resin and tert-butyl phenolic resin; The plasticizer includes methyl chloropalmitate and polybutene; The molecular weight of the polybutene is 600-1300.

2. The sealant according to claim 1, It is characterized in that The filler includes ground calcium carbonate.

3. The sealant according to claim 1, It is characterized in that The auxiliary agents include dispersants, wetting agents and formaldehyde scavengers.

4. The sealant according to claim 3, It is characterized in that The wetting agent includes nonylphenol polyoxyethylene ether.

5. A method for preparing a sealant according to any one of claims 1 to 4, It is characterized in that The preparation method comprises the following steps: Add polyacrylate emulsion, silane coupling agent, plasticizer and tackifying resin into a container in proportion, and stir evenly to obtain a mixed solution a; Adding a pH regulator in proportion to the mixed solution a and stirring to obtain a mixed solution b; After adding fillers in proportion to the mixed solution b and stirring evenly, a sealant is obtained.

6. The preparation method according to claim 5, It is characterized in that The pH of the mixed solution b is 7.5-8.

7. The preparation method according to claim 5, It is characterized in that After adding the filler, the temperature is controlled at 40-50°C during the stirring process.

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