High-foaming-ratio polyurethane artificial turf back adhesive and preparation method thereof

Abstract

This invention discloses a high-foaming-ratio polyurethane artificial turf backing adhesive, its preparation method, and its application. The polyurethane backing adhesive for artificial turf comprises the following components: a main base material, an organic amine catalyst, a foaming agent, and an organosilicon accelerator. The main base material is composed of a mixture of high-molecular-weight polyether polyol, polymeric polyether polyol, and vegetable oil polyol, with a mass ratio of (2-4):(1-3):(1-2). The high-foaming-ratio polyurethane artificial turf backing adhesive is environmentally friendly, solvent-free, non-toxic, has high pull-out strength, good resilience, and requires less adhesive application.

Description

Technical Field

[0001] This invention relates to the field of adhesive technology, specifically to a high foaming ratio polyurethane artificial turf backing adhesive and its preparation method. Background Technology

[0002] Artificial turf is a fabric that mimics natural grass, offering advantages such as easy installation, convenient maintenance, vibrant colors, high adaptability, and long service life. It can be used for flooring and decoration in indoor sports fields, playgrounds, golf courses, gardens, balconies, and hotels. The grass fibers of artificial turf are mostly made of spun and tufted polypropylene, nylon, or polyethylene, while the backing material is typically made of natural or synthetic casuarina or polypropylene. The grass fibers are interwoven with the backing through perforations on the backing layer, and a layer of adhesive is applied to the backing to reinforce the connections at the pile ends. This anchoring ability is usually expressed as pull-out force or pull-free force.

[0003] Currently, most adhesives used in artificial turf are carboxylated styrene-butadiene latex, but it has a strong odor, is not environmentally friendly, has a low foaming ratio, and the pull-out force of the grass fibers is also very limited. The reinforced surface formed is also prone to cracking, which has great limitations for high-end sports turf. Therefore, it is necessary to research and develop more environmentally friendly artificial turf backing adhesives with high pull-out force and high foaming ratio.

[0004] Polyurethane adhesives are adhesives containing urethane groups (NHCOO) or isocyanate groups (NCO) in their molecular chains. They possess characteristics such as tough film, impact resistance, good flexibility, high peel strength, excellent resistance to ultra-low temperatures, oil resistance, and abrasion resistance. Polyurethane adhesives have numerous polar groups, molecular designability, a wide bonding range, and adjustable hardness, exhibiting strong adhesion to various substrates. Furthermore, through cross-linking and crystallization, their cohesion, toughness, and bond strength are enhanced, resulting in superior anti-aging, hydrolysis resistance, and corrosion resistance, making them increasingly important in the market.

[0005] Chinese patent CN195419718A provides a high-strength polyurethane artificial turf backing adhesive, but it uses a high-boiling-point solvent, which is not environmentally friendly; Chinese patent CN101508881B provides a polyurethane adhesive composition for artificial turf, but it uses organotin or nickel as a catalyst, which poses heavy metal toxicity side effects for home leisure turf; Chinese patent CN105969290A also provides a solvent-free polyurethane artificial turf backing adhesive, but it requires a higher amount of adhesive, resulting in higher usage costs, and there is no research on the foaming ratio of the adhesive layer. Summary of the Invention

[0006] This invention provides a polyurethane artificial turf backing adhesive with high foaming ratio, which is environmentally friendly, solvent-free, non-toxic, has high pull-out force and good resilience, and its preparation method.

[0007] This invention is achieved through the following technical solution:

[0008] A polyurethane backing adhesive for artificial turf, comprising the following components: a base material, an organic amine catalyst, a foaming agent, and an organosilicon accelerator;

[0009] The main base material accounts for 25%-55% of the total mass of the polyurethane backing adhesive used in artificial turf.

[0010] The organic amine catalyst accounts for 0.008‰-0.4‰ of the total mass of the polyurethane backing adhesive used in the artificial turf.

[0011] The foaming agent accounts for 0.008‰-0.65‰ of the total mass of the polyurethane backing adhesive for artificial turf.

[0012] The organosilicon accelerator accounts for 0.065‰-4‰ of the total mass of the polyurethane backing for artificial turf;

[0013] The main base material is composed of a mixture of high molecular weight polyether polyol, polymer polyether polyol and vegetable oil polyol, with a mass ratio of (2-4):(1-3):(1-2);

[0014] The organic amine catalyst is a delayed organic amine catalyst selected from any one of bis(dimethylaminoethyl) ether, triethylenediamine, pentamethylenediethylenetriamine, N-(dimethylaminoethyl)morpholine or 1,8-diazacycloundecene;

[0015] The organosilicon accelerator is any one of γ-aminopropyltriethoxysilane, N-β-aminoethyl-γ-aminopropyltrimethoxysilane, and γ-(2,3-epoxypropoxy)propyltrimethoxysilane;

[0016] The foam stabilizer is a polyether-modified silicone surfactant specifically designed for polyurethane foam products to adjust foam density and structure. It is a commercially available product; preferred options include the AK series from Nanjing Demei Chemical and the DC series from Air Products, Inc.

[0017] The foam leveling agent does not contain any chemical foaming agent. The polyurethane artificial turf backing of this invention is physically foamed by pressurized air, with a foaming ratio of up to 1.5 times. The role of the foam leveling agent is to make the air foaming more uniform and reduce the actual amount of adhesive applied.

[0018] The high molecular weight polyether polyol is prepared using glycerol as the starting agent, with a weight-average molecular weight of 3000-7000, a functionality of 3, and a hydroxyl value of 10-50 mgKOH / g; more specifically, the polyether triol with a weight-average molecular weight of 4000-6000 and a hydroxyl value of 25-40 mgKOH / g is preferred.

[0019] The polymeric polyether polyol is a copolymer of styrene, acrylonitrile, and polyether polyol grafted together, with a solid content of 30-50% and a hydroxyl value of 10-50 mgKOH / g. More specifically, the preferred solid content is 40-45% polymeric polyether polyol, with a hydroxyl value of 20-30 mgKOH / g.

[0020] The plant oil polyols include any one of castor oil polyols, soybean oil polyols, palm oil polyols, and olive oil polyols, with a hydroxyl value of 150-450 mgKOH / g; more preferably, castor oil polyols with a hydroxyl value of 150-250 mgKOH / g are preferred.

[0021] The main base material ensures high bonding strength and high pull-out force for plastic straw fibers, while also exhibiting excellent resilience and hydrolysis resistance. The use of an organic amine catalyst, combined with a polyether-modified silicone foaming agent, results in a higher foaming ratio and more stable structure in the adhesive layer, reducing the actual amount of adhesive applied and avoiding the toxic side effects of organic heavy metal catalysts. The addition of a silicone accelerator further enhances the strength of the cured adhesive layer, improves its wear resistance, water resistance, and aging resistance against the ground.

[0022] The polyurethane backing for artificial turf of the present invention further comprises a polyisocyanate with an NCO value of 20-35%, wherein the polyisocyanate accounts for 10-15% of the total mass of the polyurethane backing for artificial turf.

[0023] The polyisocyanate comprises diphenylmethane diisocyanate (MDI) and polyphenylmethylene isocyanate (polymeric MDI); the mass ratio of the two is (0-1):(9-10).

[0024] The diphenylmethane diisocyanate includes any one of 4,4'-diphenylmethane diisocyanate (pure MDI), a mixture of 2,4'-diphenylmethane diisocyanate and 4,4'-diphenylmethane diisocyanate (MDI-50), and carbodiimide-modified diphenylmethane diisocyanate (liquefied MDI).

[0025] The polyurethane backing for artificial turf comprises component A and component B, wherein the weight ratio of component A to component B is (6-8):1; component A is composed of the following components in parts by weight:

[0026]

[0027] The B component is:

[0028] Diphenylmethane diisocyanate (MDI) 0-10 parts

[0029] Polyphenyl polymethylene isocyanate (polymeric MDI) 90-100 parts

[0030] The chain extender is any one of dipropylene glycol (DPG), diethylene glycol (DEG), 1,2-propanediol, or 1,4-butanediol.

[0031] The pigment is any one of carbon black, titanium dioxide, blue paste, and green paste;

[0032] The filler is one or more of nano-calcium carbonate, light calcium carbonate, heavy calcium carbonate, calcium oxide, silica powder, or aluminum hydroxide. Preferably, it is 400-mesh or 800-mesh heavy calcium carbonate.

[0033] The preparation method of the high foaming ratio polyurethane backing adhesive for artificial turf includes the following steps:

[0034] ① Preparation of component A: Take the weight proportions of polyether polyol, vegetable oil polyol and chain extender of the formula and add them to the mixing reactor and stir for 30 min. Then add filler and pigment to the mixing reactor and stir under vacuum of >0.9MPa for 120 min. Finally, add catalyst, foam stabilizer and accelerator and stir for 30 min to obtain component A.

[0035] ②Preparation of component B: Take the weight proportions of diphenylmethane diisocyanate and polymethylene polyphenyl isocyanate of the formula and mix them evenly to obtain component B;

[0036] The application method of the polyurethane adhesive for artificial turf involves mixing components A and B in a ratio of 6 to 8:1 (by weight). The components are then rapidly mixed in the foaming mixing head using a precise metering pump, and then applied. Nitrogen gas is introduced through a bypass to adjust the foaming ratio and achieve the most economical amount of adhesive.

[0037] Compared with the prior art, the present invention has the following beneficial effects:

[0038] The polyurethane artificial turf backing adhesive of this invention does not use organic solvents or organic heavy metal catalysts, making it environmentally friendly, safe, non-toxic, and pollution-free. At the same time, it has excellent bonding strength and economic practicality, making it well applicable to the processing and manufacturing of various artificial turf. Specific Implementation

[0039] Unless otherwise specified, all component raw materials in the following examples are commercially available products.

[0040] Example 1:

[0041] A polyurethane adhesive for high foaming ratio artificial turf, comprising component A and component B;

[0042] Component A is composed of the following components in parts by weight:

[0043]

[0044] Component B is a polyisocyanate, comprising the following components in parts by weight:

[0045] 6 parts of liquefied MDI (Wanhua Company product)

[0046] Polymer MDI (Covestro product) 94 units

[0047] The high-foaming-ratio polyurethane adhesive for artificial turf is prepared as follows:

[0048] ① Preparation of component A: Take the weight proportions of polyether polyol, polymer polyol, vegetable oil polyol and chain extender of the formula and add them to the mixing reactor and stir for 30 min. Then add filler and pigment to the mixing reactor and stir under vacuum of >0.9MPa for 120 min. Finally, add catalyst, foam stabilizer and accelerator and stir for 30 min to obtain component A.

[0049] ②Preparation of component B: Take the weight proportions of the formula of liquefied diphenylmethane diisocyanate and polymethylene polyphenyl isocyanate and mix them evenly to obtain component B;

[0050] The application method is as follows: Components A and B are mixed in a 6.5:1 (weight ratio). The mixture is then rapidly mixed in the foaming mixing head using precise metering pumps for components A and B before application. Nitrogen gas is introduced through a bypass to adjust the foaming ratio, achieving a foaming ratio of up to 1.9 times. The amount of adhesive applied is reduced to 300-350 g / m³. 2 .

[0051] Example 2:

[0052] A polyurethane adhesive for artificial turf, comprising component A and component B:

[0053] Component A is:

[0054]

[0055]

[0056] Component B is a polyisocyanate, comprising the following components in parts by weight:

[0057] MDI-50 (Wanhua Company product) 8 parts

[0058] Polymer MDI (BASF product) 92 parts

[0059] The polyurethane adhesive for artificial turf is prepared by the following method:

[0060] ① Preparation of component A: Take the weight proportions of polyether polyol, polymer polyol, vegetable oil polyol and chain extender of the formula and add them to the mixing reactor and stir for 30 min. Then add filler and pigment to the mixing reactor and stir under vacuum of >0.9MPa for 120 min. Finally, add catalyst, foam stabilizer and accelerator and stir for 30 min to obtain component A.

[0061] ②Preparation of component B: Take the weight proportions of diphenylmethane diisocyanate and polymethylene polyphenyl isocyanate of the formula and mix them evenly to obtain component B;

[0062] The application method of the polyurethane adhesive for artificial turf involves mixing components A and B in a weight ratio of 6.8:1. The mixture is rapidly mixed in the foaming head using precise metering pumps for components A and B, and then applied. Nitrogen gas is introduced via a bypass to adjust the foaming ratio, achieving a foaming ratio of up to 1.8 times. The amount of adhesive applied is reduced to 350-400 g / m². 2 .

[0063] Example 3:

[0064] A high-expansion-ratio polyurethane adhesive for artificial turf, comprising component A and component B.

[0065] Component A is composed of the following components in parts by weight:

[0066]

[0067]

[0068] Component B is a polyisocyanate, composed of the following components in parts by weight:

[0069] MDI-100 (Wanhua Company product) 2 portions

[0070] Polymer MDI (Covestro product) 98 units

[0071] The high foaming ratio polyurethane adhesive for artificial turf is prepared by the following method:

[0072] ① Preparation of component A: Take the weight proportions of polyether polyol, polymer polyol, vegetable oil polyol and chain extender of the formula and add them to the mixing reactor and stir for 30 min. Then add filler and pigment to the mixing reactor and stir under vacuum of >0.9MPa for 120 min. Finally, add catalyst, foam stabilizer and accelerator and stir for 30 min to obtain component A.

[0073] ②Preparation of component B: Take the weight proportions of diphenylmethane diisocyanate and polymethylene polyphenyl isocyanate of the formula and mix them evenly to obtain component B;

[0074] The application method of the polyurethane adhesive for artificial turf involves mixing components A and B in a 7.5:1 (by weight) ratio. The mixture is rapidly mixed in the foaming head using precise metering pumps for components A and B, and then applied. Nitrogen gas is introduced via a bypass to adjust the foaming ratio, achieving a foaming ratio of up to 1.7 times. This reduces the adhesive application amount to 360-430 g / m². 2 .

[0075] Example 4:

[0076] A high-expansion-ratio polyurethane adhesive for artificial turf, comprising component A and component B.

[0077] Component A is composed of the following components in parts by weight:

[0078]

[0079] Component B is a polyisocyanate, specifically 100 parts of polymeric MDI (a Covestro product);

[0080] The preparation method of the high foaming ratio polyurethane adhesive for artificial turf is as follows:

[0081] ① Preparation of component A: Add polyether polyol, vegetable oil polyol and chain extender to a mixing reactor and stir for 30 min. Then add filler and pigment to the mixing reactor and stir under vacuum > 0.9 MPa for 120 min. Finally add catalyst, foam stabilizer and accelerator and stir for 30 min to obtain component A.

[0082] ②Preparation of component B: Take the specified weight parts of polymethylene polyphenyl isocyanate (polymeric MDI) to obtain component B;

[0083] The application method of the polyurethane adhesive for artificial turf is as follows: Components A and B are mixed in a ratio of 7.8:1 (by weight). The mixture is then rapidly mixed in the foaming mixing head using a precise metering pump for components A and B, and then applied. Nitrogen gas is introduced through a bypass to adjust the foaming ratio, achieving a foaming ratio of up to 1.5 times. The amount of adhesive applied is reduced to 380-450 g / m². 2 .

Claims

1. A polyurethane backing adhesive for artificial turf, characterized by, Its composition includes the following components: main base material, organic amine catalyst, foam stabilizer and organosilicon accelerator; The main base material accounts for 25%-55% of the total mass of the polyurethane backing adhesive used in artificial turf. The organic amine catalyst accounts for 0.008‰-0.4‰ of the total mass of the polyurethane backing adhesive for artificial turf, and the foam leveling agent accounts for 0.008‰-0.65‰ of the total mass of the polyurethane backing adhesive for artificial turf. The organosilicon accelerator accounts for 0.065‰-4‰ of the total mass of the polyurethane backing for artificial turf; The main base material is composed of a mixture of high molecular weight polyether polyol, polymer polyether polyol and vegetable oil polyol, with a mass ratio of (2-4):(1-3):(1-2). The organic amine catalyst is a delayed organic amine catalyst selected from any one of bis(dimethylaminoethyl) ether, triethylenediamine, pentamethylenediethylenetriamine, N-(dimethylaminoethyl)morpholine or 1,8-diazacycloundecene; The organosilicon accelerator is any one of γ-aminopropyltriethoxysilane, N-β-aminoethyl-γ-aminopropyltrimethoxysilane, and γ-(2,3-epoxypropoxy)propyltrimethoxysilane; The foaming agent is a polyether-modified organosilicon surfactant; The high molecular weight polyether polyol is prepared using glycerol as a starting agent, and the weight-average molecular weight is between 3000 and 7000. The polymer polyether polyol is a copolymer of styrene, acrylonitrile and polyether polyol graft copolymerized.

2. The polyurethane backing adhesive for artificial turf according to claim 1, characterized by, The high molecular weight polyether polyol has a functionality of 3 and a hydroxyl value of 10-50 mgKOH / g.

3. The polyurethane backing adhesive for artificial turf according to claim 2, characterized by, The high molecular weight polyether polyols mentioned are polyether triols with a weight average molecular weight of 4000-6000 and a hydroxyl value of 25-40 mgKOH / g.

4. The polyurethane backing adhesive for artificial turf according to claim 1, characterized by, The polymer polyether polyol has a solid content of 30-50% and a hydroxyl value of 10-50 mg KOH / g.

5. The polyurethane backing adhesive for artificial turf according to claim 4, characterized in that, The polymer polyether polyol has a solid content of 40-45% and a hydroxyl value of 20-30 mg KOH / g.

6. The polyurethane backing adhesive for artificial turf according to claim 1, characterized in that, The plant oil polyols mentioned include any one of castor oil polyols, soybean oil polyols, palm oil polyols, and olive oil polyols, with a hydroxyl value of 150-450 mgKOH / g.

7. The polyurethane backing adhesive for artificial turf according to claim 6, characterized in that, The plant oil polyol mentioned is castor oil polyol, with a hydroxyl value of 150-250 mgKOH / g.

8. The polyurethane backing adhesive for artificial turf according to claim 1, characterized in that, The polyurethane backing for artificial turf further comprises a polyisocyanate with an NCO value of 20-35%, wherein the polyisocyanate accounts for 10-15% of the total mass of the polyurethane backing for artificial turf; the polyisocyanate includes diphenylmethane diisocyanate and polyphenylmethylene isocyanate; the mass ratio of the two is (0-1):(9-10), wherein the diphenylmethane diisocyanate includes any one of 4,4'-diphenylmethane diisocyanate, a mixture of 2,4'-diphenylmethane diisocyanate and 4,4'-diphenylmethane diisocyanate, and carbodiimide-modified diphenylmethane diisocyanate.

9. The polyurethane backing adhesive for artificial turf according to claim 8, characterized in that, The polyurethane backing adhesive for artificial turf includes component A and component B, with a weight ratio of component A to component B of (6-8):

1. Component A is composed of the following components, in parts by weight: ， The B component is: 0-10 parts of diphenylmethane diisocyanate 90-100 parts of polyphenyl polymethylene isocyanate The chain extender is any one of dipropylene glycol, diethylene glycol, 1,2-propanediol, or 1,4-butanediol. The pigment is any one of carbon black, titanium dioxide, blue paste, and green paste; The filler is one or more of nano-calcium carbonate, light calcium carbonate, heavy calcium carbonate, calcium oxide, silica powder, or aluminum hydroxide.

10. The polyurethane backing adhesive for artificial turf according to claim 9, characterized in that, The filler is 400-800 mesh heavy calcium carbonate.

11. The method of applying the polyurethane backing adhesive for artificial turf according to any one of claims 8-10, characterized in that, Components A and B are mixed in a ratio of 6 to 8:

1. The mixture is then rapidly mixed in the foaming head using precise metering pumps for components A and B before application. Nitrogen gas is introduced through a bypass to regulate the foaming process.

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