Fiber-reinforced water-based PVC (polyvinyl chloride) floor glue as well as preparation method and application thereof

Abstract

The invention belongs to the technical field of adhesives, and provides a fiber-reinforced water-based PVC floor adhesive and a preparation method thereof. The fiber-reinforced water-based PVC floor glue is prepared from the following components in parts by weight: 30 to 50 parts of elastic polymer emulsion, 0.4 to 1 part of dispersing agent, 0.1 to 0.3 part of defoaming agent, 0.1 to 0.3 part of sterilizing agent, 0.1 to 3 parts of thickening agent, 5 to 8 parts of water, 0.1 to 0.5 part of ammonia water, 10 to 20 parts of rosin solution, 20 to 50 parts of calcium carbonate, 0.1 to 8 parts of A3 sand and 0.1 to 0.4 part of reinforced fiber. The problem that after an existing PVC floor is pasted, due to temperature change, a transverse shrinkage welding seam becomes large and even cracks is effectively solved. The adhesive is high in bonding strength, convenient to use and capable of replacing a traditional building floor adhesive.

Description

Technical Field

[0001] The invention belongs to the technical field of adhesives, and in particular relates to a fiber-reinforced water-based PVC floor adhesive and a preparation method and application thereof. Background Art

[0002] Polyvinyl chloride (PVC) flooring has been widely recognized in large and medium-sized cities in China and is widely used, such as indoor homes, hospitals, schools, office buildings, factories, public places, supermarkets, stadiums, etc. PVC floor adhesive is a construction adhesive that came into being with the booming development of PVC flooring.

[0003] The widely used PVC floor adhesives at present are mainly water-soluble polyethylene formal adhesives and water-soluble acetal adhesives. The initial bonding strength of this type of adhesive is average, and the tensile strength for PVC flooring is not high. After use, it continuously releases harmful volatile gases such as formaldehyde for a long time, which seriously affects the environment and the health of people who are active indoors. In addition, although the environmental protection performance and initial bonding performance of some PVC floor adhesives made of elastic polymer emulsions on the market are better than formal adhesives, the final tensile shear strength is generally not high, and it cannot adapt well to the lateral shrinkage after the floor is pasted. After pasting, the floor joints often become larger or even the welding rods fall off completely. Especially under aging conditions, it may cause poor adhesion between the floor and the ground.

[0004] Therefore, it is of great practical significance to develop water-based elastic polymer PVC floor adhesive with excellent performance and high shear strength. Summary of the invention

[0005] The purpose of the present invention is to provide a fiber-reinforced water-based PVC floor adhesive and a preparation method and application thereof.

[0006] In order to achieve the above object, the present invention provides the following technical solutions:

[0007] A fiber-reinforced water-based PVC floor adhesive comprises the following components in parts by weight: 30-50 parts of elastic polymer emulsion, 0.4-1 parts of dispersant, 0.1-0.3 parts of defoamer, 0.1-0.3 parts of bactericide, 0.1-0.3 parts of thickener, 5-8 parts of water, 0.1-0.5 parts of ammonia water, 10-20 parts of rosin solution, 20-50 parts of calcium carbonate, 0.1-8 parts of A3 sand and 0.1-0.4 parts of reinforcing fiber.

[0008] Furthermore, the elastic polymer emulsion is any one or more of polyacrylic acid emulsion, styrene acrylic emulsion or silicone acrylic emulsion.

[0009] Furthermore, the elastic polymer emulsion includes polyacrylic acid emulsion, styrene acrylic emulsion and silicone acrylic emulsion in a weight ratio of 1: (1.3-1.5): (0.6-0.8).

[0010] The elastic polymer emulsion with a specific ratio is added to the system of the present invention to improve the shear strength and peel strength of the floor adhesive. The compounded elastic polymer emulsion can synergize with other components in the system to form a more evenly distributed stress absorption network inside the floor adhesive, and at the same time help to form a tighter interface bonding.

[0011] Furthermore, the reinforcing fibers include polyvinyl alcohol fibers, polypropylene fibers and Kevlar fibers in a weight ratio of (0.2-0.4):(1.5-1.7):1.

[0012] Furthermore, the length of the polyvinyl alcohol fiber is 1-3 mm, the length of the polypropylene fiber is 1-4 mm; and the length of the Kevlar fiber is 1-3 mm.

[0013] Furthermore, the rosin solution is prepared by mixing non-crystallized rosin, rosin glycerol ester, liquid rosin and diethylene glycol butyl ether acetate.

[0014] Furthermore, the preparation method of the rosin solution is as follows: by weight, 25-30 parts of diethylene glycol butyl ether acetate are added to a reaction kettle, stirring is started, and then 20-25 parts of liquid rosin, 24-29 parts of non-crystallized rosin and 25-30 parts of rosin glycerol ester are added in sequence while stirring, and stirred for 6-8 hours until the solid components are completely dissolved and the mixture is uniform and free of lumps, thereby obtaining a rosin solution.

[0015] Furthermore, the weight ratio of the sum of the weights of the calcium carbonate, the reinforcing fiber and the A3 sand to the elastic polymer emulsion and the rosin solution is (25-30):(36-42):(14-19).

[0016] During the test, it was found that the sum of the weight of calcium carbonate, reinforcing fiber and A3 sand and the elastic polymer emulsion and rosin solution within a specific ratio range can improve the aging resistance of floor glue. The analysis shows that under this condition, calcium carbonate, reinforcing fiber and A3 sand act synergistically with elastic polymer emulsion and rosin solution as fillers, and through multiple defense mechanisms, the best balance between rigidity and flexibility can be found, thereby improving the overall performance and aging resistance of floor glue.

[0017] Furthermore, the calcium carbonate particle size is 100-300 meshes.

[0018] Furthermore, the dispersant is sodium polyacrylate with a solid content of 40%.

[0019] Furthermore, the defoaming agent is polyether-modified siloxane.

[0020] Furthermore, the fungicide is isothiazolinone.

[0021] Furthermore, the thickener is one or more of an associative acrylic thickener, a cellulose ether or a polyurethane thickener.

[0022] The present invention also provides a method for preparing a fiber-reinforced water-based PVC floor adhesive, comprising the following steps:

[0023] Step 1, pour calcium carbonate, A3 sand and reinforcing fiber into a dry powder mixing tank, turn on the fly knife, stir for 0.5-1h to obtain a mixture, and set it aside for use;

[0024] Step 2, pour the elastic polymer emulsion into a stirring tank, start stirring, add dispersant, defoamer, bactericide, thickener and water into the stirring tank in sequence while stirring, after stirring evenly, add ammonia water to adjust the pH value of the system to 7-8.

[0025] Step 3, continue to slowly pour the mixture of step 1 into the mixing tank and stir for 30-45 minutes until it is uniform and free of particles;

[0026] Step 4, finally, slowly pour the rosin solution into the stirring tank and stir for 30-50 minutes until it is uniform and free of particles to obtain the fiber-reinforced water-based PVC floor adhesive.

[0027] The invention provides application of the fiber-reinforced water-based PVC floor adhesive in bonding PVC floors and cement-based self-leveling floors.

[0028] Compared with the prior art, the advantages and beneficial effects of the present invention are:

[0029] 1. Compared with the prior art, the fiber-reinforced floor adhesive prepared by the present invention is prepared by adding a reinforcing fiber combination and a small amount of A3 sand as fillers to the existing elastic polymer emulsion system, and after scientific proportioning and sufficient stirring, has the advantages of increasing the shear strength of the colloid after drying without substantially affecting the original initial adhesion strength, coating area and open time, reducing the dimensional change caused by thermal expansion and contraction after the floor is pasted, and can effectively reduce the expansion of the weld after the PVC floor is pasted, and even cracking and detachment. In particular, the bonding effect between the PVC floor and the cement-based self-leveling is very excellent, and it is worthy of promotion and application.

[0030] 2. Polyvinyl alcohol fiber is a fiber with good toughness, strong solvent resistance and simple dispersion. Polypropylene fiber has good toughness, high strength and strong heat resistance. The two fibers are used together to complement each other. The two fibers can form a three-dimensional network structure after the system is dried and solidified, forming a skeleton similar to concrete steel bars in the film. The A3 sand particles distributed in the colloid greatly increase the cohesive strength of the colloid and further increase the shear strength after pasting. In addition, the main base material of this product is elastic polymer emulsion, which contains very little volatile solvent, low VOC content, and is green and environmentally friendly. The process is simple, as long as physical mixing is carried out in a closed mixing tank, no special chemical synthesis process is required, and the production is simple and the application is convenient. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] The raw materials used in the following examples of the present invention are all commercially available products, and the specific manufacturers and models are as follows:

[0033] Polyacrylic acid emulsion, BASF Acronal7590x.

[0034] Styrene acrylic emulsion, Qingyuan sublimation HE301.

[0035] Silicone acrylic emulsion, Jiangsu Sunrise TD-606T.

[0036] Polyvinyl alcohol fiber, Kuraray polyvinyl alcohol fiber.

[0037] Polypropylene fiber, Longhu Technology PP fiber.

[0038] Kevlar fiber, DuPont Kevlar fiber.

[0039] Dispersant, sodium polyacrylate with a solid content of 40%, Nopco SN5040.

[0040] Defoaming agent, polyether modified siloxane, Dow Corning ACP1266.

[0041] Fungicide, isothiazolinone, Rohm and Haas Kathon LXE fungicide.

[0042] Acrylic thickener, associative acrylic thickener, BASF RheovisAS1125.

[0043] Cellulose ether, Asialand HBR250.

[0044] Polyurethane thickener, Gotai 830W.

[0045] Non-crystallized rosin, Wuzhou Feizhuo Fintac2331.

[0046] Rosin glycerol ester, Wuzhou Feizhuo 4110.

[0047] Liquid rosin, Wuzhou Feizhuo 4270.

[0048] Calcium carbonate, 100-300 mesh, Hubei Jingjing Calcium Industry Co., Ltd., heavy calcium carbonate.

[0049] Example 1

[0050] The present embodiment provides a fiber-reinforced water-based PVC floor adhesive, comprising the following components in parts by weight: 38 parts of elastic polymer emulsion, 0.6 parts of dispersant, 0.2 parts of defoamer, 0.2 parts of bactericide, 1 part of thickener, 6 parts of water, 0.4 parts of ammonia water, 18 parts of rosin solution, 26 parts of calcium carbonate, 2 parts of A3 sand and 0.3 parts of reinforcing fiber.

[0051] The elastic polymer emulsion comprises polyacrylic acid emulsion, styrene acrylic emulsion and silicone acrylic emulsion in a weight ratio of 1:1.4:0.7.

[0052] The reinforcing fibers include polyvinyl alcohol fibers, polypropylene fibers and Kevlar fibers in a weight ratio of 0.3:1.6:1. The length of the polyvinyl alcohol fibers is 1-3 mm, the length of the polypropylene fibers is 1-4 mm, and the length of the Kevlar fibers is 1-3 mm.

[0053] The preparation method of the rosin solution is as follows: 26 parts of diethylene glycol butyl ether acetate are added into a reaction kettle by weight, stirring is started, and then 23 parts of liquid rosin, 25 parts of non-crystallized rosin and 27 parts of rosin glycerol ester are added in sequence while stirring, and stirring is performed for 7 hours until the solid components are completely dissolved and the mixture is uniform and free of lumps, thereby obtaining a rosin solution.

[0054] The preparation method of the fiber-reinforced water-based PVC floor adhesive comprises the following steps:

[0055] Step 1, pour calcium carbonate, A3 sand and reinforcing fiber into a dry powder mixing tank, turn on the flying knife, stir for 0.6h to obtain a mixture, and set it aside for use;

[0056] Step 2, pour the elastic polymer emulsion into a stirring tank, start stirring, add the dispersant, defoamer, bactericide, thickener and water into the stirring tank in sequence while stirring, and after stirring evenly, add ammonia water to adjust the pH value of the system to 7.5.

[0057] Step 3, continue to slowly pour the mixture of step 1 into the mixing tank and stir for 40 minutes until it is uniform and free of particles;

[0058] Step 4, finally, slowly pour the rosin solution into the stirring tank and stir for 40 minutes until it is uniform and free of particles to obtain a fiber-reinforced water-based PVC floor adhesive.

[0059] Example 2

[0060] The difference between this embodiment and embodiment 1 is that a fiber-reinforced water-based PVC floor adhesive is provided, comprising the following components in parts by weight: 30 parts of elastic polymer emulsion, 0.6 parts of dispersant, 0.2 parts of defoamer, 0.2 parts of bactericide, 1 part of thickener, 6 parts of water, 0.4 parts of ammonia water, 12 parts of rosin solution, 40 parts of calcium carbonate, 0.5 parts of A3 sand and 0.4 parts of reinforcing fiber.

[0061] Comparative Example 1

[0062] The difference between this comparative example and Example 1 is that the elastic polymer emulsion is a styrene acrylic emulsion.

[0063] Comparative Example 2

[0064] The difference between this comparative example and Example 1 is that the elastic polymer emulsion includes polyacrylic acid emulsion, styrene acrylic emulsion and silicone acrylic emulsion in a weight ratio of 1:1.4.

[0065] Comparative Example 3

[0066] The difference between this comparative example and Example 1 is that the elastic polymer emulsion includes polyacrylic acid emulsion, styrene acrylic emulsion and silicone acrylic emulsion in a weight ratio of 1:1:1.

[0067] Comparative Example 4

[0068] The difference between this comparative example and Example 1 is that A3 sand is not added, and one portion of A3 sand is replaced by calcium carbonate.

[0069] Comparative Example 5

[0070] The difference between this comparative example and Example 1 is that no reinforcing fiber is added, and the reinforcing fiber is replaced by calcium carbonate.

[0071] Comparative Example 6

[0072] The difference between this comparative example and Example 1 is that the reinforcing fiber is replaced by a conventional mixture of polyvinyl alcohol powder and polypropylene powder in a weight ratio of 1:1. The polyvinyl alcohol powder is Wanwei 2488, and the polypropylene powder is Maoming Petrochemical PPH-T03.

[0073] Performance Testing

[0074] The fiber-reinforced water-based PVC floor adhesives prepared in Examples 1-2 and Comparative Examples 1-6 were tested according to the performance requirements of Table 1. The performance test results are shown in Table 2.

[0075] Table 1: Product performance test items

[0076]

[0077]

[0078] Table 2: Product performance test table

[0079]

[0080] Table 3: Dimensional change rate after accelerated aging of flooring paste

[0081] project Transverse dimensional change, mm Longitudinal size change, mm Example 1 0.19 0.18 Example 2 0.25 0.23 Comparative Example 1 0.60 0.57 Comparative Example 2 0.46 0.44 Comparative Example 3 0.37 0.39 Comparative Example 4 0.35 0.32 Comparative Example 5 0.34 0.30 Comparative Example 6 0.73 0.75

[0082] It can be seen from Table 1 and Table 2 that the floor glue prepared in Examples 1-2 has excellent coating properties, and the aging resistance of Example 1 is significant, indicating that the weight ratio of the sum of the weights of calcium carbonate, reinforcing fiber and A3 sand, and the weight ratio of the elastic polymer emulsion and the rosin solution is in the range of (25-30): (36-42): (14-19), and the aging resistance effect is better.

[0083] In Comparative Examples 1-3, the elastic polymer emulsions have different compositions and ratios, and the overall shear strength and peel strength decrease.

[0084] Comparative Examples 4-5 show that when only one of the reinforcing fiber combination or A3 sand is added, the strength decreases and the dimensional change rate of the floor after thermal aging increases, indicating that the two play a synergistic role in the system.

[0085] In Comparative Example 6, polyvinyl alcohol powder and polypropylene powder are used instead of fiber addition, which not only has a significant air entrainment effect, but also greatly increases the number of colloid bubbles, which has a great impact on the appearance and the amount of glue applied, but the strength is significantly reduced compared with ordinary PVC floor glue. This is because polyvinyl alcohol powder has a significant air entrainment effect after dissolving, and the powder is dispersed in the colloid, which does not play the role of a skeleton for the fibers to bridge and support each other, but only plays a filler role.

[0086] In summary, adding a certain amount of A3 sand and reinforcing fiber to the original formula of water-based PVC floor glue can increase the shear strength of the colloid after drying without affecting the original initial adhesion strength, coating area and open time, and reduce the dimensional changes caused by thermal expansion and contraction after the floor is pasted. It can effectively reduce the expansion of welds and even cracking and detachment caused by shrinkage after PVC floor is pasted, and is worthy of promotion and application.

[0087] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A fiber-reinforced water-based PVC floor adhesive, characterized in that: The invention comprises the following components in parts by weight: 30-50 parts of elastic polymer emulsion, 0.4-1 parts of dispersant, 0.1-0.3 parts of defoamer, 0.1-0.3 parts of bactericide, 0.1-3 parts of thickener, 5-8 parts of water, 0.1-0.5 parts of ammonia water, 10-20 parts of rosin solution, 20-50 parts of calcium carbonate, 0.1-8 parts of A3 sand and 0.1-0.4 parts of reinforcing fiber.

2. The fiber-reinforced water-based PVC floor adhesive according to claim 1, characterized in that: The elastic polymer emulsion is any one or more of polyacrylic acid emulsion, styrene acrylic emulsion or silicone acrylic emulsion.

3. The fiber-reinforced water-based PVC floor adhesive according to claim 2, characterized in that: The elastic polymer emulsion comprises polyacrylic acid emulsion, styrene acrylic emulsion and silicone acrylic emulsion in a weight ratio of 1:(1.3-1.5):(0.6-0.8).

4. The fiber-reinforced water-based PVC floor adhesive according to claim 1, characterized in that: The reinforcing fibers include polyvinyl alcohol fibers, polypropylene fibers and Kevlar fibers in a weight ratio of (0.2-0.4):(1.5-1.7):

1.

5. The fiber-reinforced water-based PVC floor adhesive according to claim 4, characterized in that: The length of the polyvinyl alcohol fiber is 1-3 mm, the length of the polypropylene fiber is 1-4 mm; and the length of the Kevlar fiber is 1-3 mm.

6. The fiber-reinforced water-based PVC floor adhesive according to claim 1, characterized in that: The preparation method of the rosin solution is as follows: adding diethylene glycol butyl ether acetate into a reaction kettle, starting stirring, then adding liquid rosin, non-crystallized rosin and rosin glycerol ester in sequence while stirring, stirring for 6-8 hours until the solid components are completely dissolved and the mixture is uniform and free of lumps, thereby obtaining a rosin solution.

7. The fiber-reinforced water-based PVC floor adhesive according to claim 1, characterized in that: The weight ratio of the sum of the weights of the calcium carbonate, the reinforcing fiber and the A3 sand to the elastic polymer emulsion and the rosin solution is (25-30): (36-42): (14-19).

8. The fiber-reinforced water-based PVC floor adhesive according to claim 1, characterized in that: The invention comprises the following components in parts by weight: 38 parts of elastic polymer emulsion, 0.6 parts of dispersant, 0.2 parts of defoamer, 0.2 parts of bactericide, 1 part of thickener, 6 parts of water, 0.4 parts of ammonia water, 18 parts of rosin solution, 26 parts of calcium carbonate, 2 parts of A3 sand and 0.3 parts of reinforcing fiber.

9. A method for preparing the fiber-reinforced water-based PVC floor adhesive according to any one of claims 1 to 8, characterized in that: The following steps are involved: Step 1, pour calcium carbonate, A3 sand and reinforcing fiber into a dry powder mixing tank, turn on the fly knife, stir for 0.5-1h to obtain a mixture, and set it aside for use; Step 2, pour the elastic polymer emulsion into a stirring tank and start stirring; while stirring, add the dispersant, defoamer, bactericide, thickener and water into the stirring tank in sequence, stir evenly, and then add ammonia water to adjust the pH value of the system to alkaline. Step 3, continue to slowly pour the mixture of step 1 into the mixing tank and stir for 30-45 minutes until it is uniform and free of particles; Step 4, finally, slowly pour the rosin solution into the stirring tank and stir for 30-50 minutes until it is uniform and free of particles to obtain the fiber-reinforced water-based PVC floor adhesive.

10. Use of the fiber-reinforced water-based PVC floor adhesive according to any one of claims 1 to 8 in bonding PVC floor and cement-based self-leveling.

Images