Preparation method of waterborne polyurethane balloon

Abstract

The invention relates to a preparation method of a waterborne polyurethane balloon, and discloses a preparation method of a waterborne polyurethane balloon, belonging to the field of production and manufacturing of polymer balloons. The method comprises the following steps: (1) preparing a glue solution, namely mixing a waterborne polyurethane emulsion, color paste, a wetting agent, a defoaming agent and a chelating agent according to a ratio to obtain the emulsion; (2) preparing a coagulating agent: preparing a coagulating agent solution from a release agent, a flocculating agent, a wetting agent and water; and (3) forming process: carrying out flocculation reaction on the coagulator and the glue solution by adopting an impregnation method, and drying to form a polyurethane balloon film layer, and the waterborne polyurethane balloon prepared by adopting the method has excellent air tightness and oxidation resistance.

Description

Technical Field

[0001] The invention belongs to the technical field of polymer material processing, and particularly relates to a method for preparing a balloon using waterborne polyurethane as a base material. Background Art

[0002] Traditional balloons are mostly made from natural rubber latex combined with a vulcanization accelerator system. This product is easily oxidized and prone to producing harmful substances such as nitrosamines. Waterborne polyurethane is an environmentally friendly polymer material that is non-toxic, biocompatible, forms dense films, and has excellent airtightness. Due to the inherent differences between waterborne polyurethane and natural latex materials, the cohesive force of a waterborne polyurethane film is more than twice that of a natural latex film of equal thickness. Existing balloon production processes cannot solve the difficulties of demolding and industrial production of waterborne polyurethane balloons. To date, no technology for the industrial production of waterborne polyurethane balloons has emerged, and a method and process for producing waterborne polyurethane balloons is urgently needed. Summary of the Invention

[0003] The present invention provides a method for preparing an environmentally friendly water-based polyurethane balloon, and the technical solution thereof is as follows.

[0004] (1) Configuration of glue raw materials: Based on 100 parts of the glue raw material, the following ingredients are used: 80-100 parts of waterborne polyurethane emulsion, 0-10 parts of color paste, 0.02-0.08 parts of defoaming agent, 0.01-1 parts of wetting agent and 1-5 parts of chelating agent.

[0005] (2) Preparation of coagulant mixed solution, The coagulant mixed solution is composed of 8-20 parts of release agent, 8-25 parts of flocculant, 0.02-2 parts of wetting agent, 0.02-2 parts of defoaming agent, and 50-86 parts of water based on 100 parts by weight.

[0006] Furthermore, the waterborne polyurethane emulsion has a solid content of 25-50% and a temperature of 5-45 degrees.

[0007] Furthermore, the wetting agent is a polyether-modified silicone, one of the acetylene glycol type.

[0008] Furthermore, the chelating agent is one or a combination of sodium gluconate, amino acid chelating agent, and EDTA chelating agent.

[0009] Furthermore, the release agent is one of diatomaceous earth type, aqueous stearate type, aqueous amide type, aqueous wax emulsion type, or a combination thereof.

[0010] Furthermore, the flocculant is one of calcium nitrate salt and calcium chloride salt.

[0011] (3) Impregnation process Mold cleaning → (2) Dipping in coagulant (60-80)℃ → (4) Drying (3-5min) → (5) Dipping in glue → (6) Drying (40-60℃, 5-8min) → (7) Curling → (8) Leaching (deionized water, 40-50℃) → (9) Drying (90-120℃) → (10) Dipping in anti-sticking agent → (11) Drying (90-120℃) → (12) Demolding.

[0012] Furthermore, the temperature of the mold for dipping the emulsion in step 1 is 15-45°C.

[0013] Beneficial effects. This technology utilizes a single-step dipping process, achieving a thickness of 0.09-0.22mm. The resulting polyurethane balloons possess superior overall performance, matching or exceeding that of latex balloons. The addition of an appropriate amount of chelating agent during the production process addresses the stability issues associated with continuous polyurethane emulsion production. The addition of a release agent to the flocculant addresses the difficulty of demolding water-based polyurethane. Combined with the dipping process, this technology has achieved a breakthrough in the industrialized production of water-based polyurethane balloons. DETAILED DESCRIPTION

[0014] Example 1 (Take 100KG as an example. Unless otherwise specified, all products are commercially available) Step 1: Prepare the water-based polyurethane mixed glue: Take 91 parts of a 35% solid content water-based polyurethane emulsion (Wanhua model: Water-based Polyurethane 1615), add 5 parts of water-based red paste, 0.5 parts of a polyether-modified silicone wetting agent, 3 parts of an EDTA-2Na chelating agent, and 0.5 parts of a defoaming agent. Stir the above ingredients evenly and set aside. Step 2: Preparation of coagulant: Mix 15 parts of diatomaceous earth release agent, 20 parts of calcium chloride, 1 part of wetting agent, 0.5 parts of defoaming agent and 63.5 parts of deionized water and set aside; Step 3: Dipping molding process: After the stainless steel round balloon mold is alternately cleaned with acid and alkali, it is dipped in the coagulant for 10 seconds, dried in a 70°C oven for 4 minutes, the mold surface is dried, and when the mold temperature drops to 25°C, it is transferred to a water-based polyurethane mixed glue pool for immersion for 10 seconds, dried in a 70°C oven for 4 minutes, transferred to a crimping machine for curling, transferred to a 50°C leaching pool for leaching for 3 minutes, transferred to an oven for drying at 120°C for 45 minutes, and after the film layer is completely dry, transferred to an outer isolation tank for dipping in the anti-sticking agent for 10 seconds, transferred to an oven for baking at 100°C for 1 minute, and transferred to a demolding machine for mechanical demolding to obtain a balloon product with a wall thickness of 0.12mm.

[0015] Example 2 Step 1: Preparation of water-based polyurethane mixed glue: Take 91 parts of water-based polyurethane emulsion (Ketian KT-731B) with a solid content of 40%, add 5 parts of water-based blue paste, 0.5 parts of acetylene glycol wetting agent, 3 parts of sodium gluconate chelating agent, and 0.5 parts of defoaming agent, stir the above ingredients evenly and set aside; Step 2: Preparation of coagulant: Mix 15 parts of aqueous calcium stearate release agent, 15 parts of calcium nitrate, 1 part of wetting agent, 0.5 parts of defoaming agent and 63.5 parts of deionized water and set aside; Step 3: Dipping molding process: After the spherical plastic balloon mold is alternately cleaned with acid and alkali, it is dipped in the coagulant for 10 seconds, dried in a 70°C oven for 5 minutes, the mold surface is dried, and when the mold temperature drops to 30°C, it is moved into a water-based polyurethane mixed glue pool and immersed for 10 seconds, dried in a 70°C oven for 5 minutes, moved into a crimping machine for curling, moved into a 55°C leaching pool for leaching for 4 minutes, moved into an oven for drying at 120°C for 50 minutes, demolded after the film layer is completely dry, moved into an outer isolation tank to dip in the anti-sticking agent for 10 seconds, moved into an oven for baking at 100°C for 1.5 minutes, and moved into a demolding machine for mechanical demolding to obtain a balloon product with a wall thickness of 0.16mm.

[0016] Example 3 Step 1: Preparation of water-based polyurethane mixed glue: Take 91 parts of water-based polyurethane emulsion (Huatai C6-45) with a solid content of 50%, add 5 parts of water-based light green paste, 0.5 parts of polyether-modified silicone wetting agent, 3 parts of tetrasodium iminodisuccinate, and 0.5 parts of defoamer, stir the above materials evenly and set aside; Step 2: Preparation of coagulant: Mix 15 parts of water-based stearic acid amide release agent, 15 parts of calcium chloride, 0.5 parts of wetting agent, 0.5 parts of defoaming agent and 69 parts of deionized water and set aside; Step 3: Dipping molding process: After the ceramic spherical balloon mold is cleaned alternately with acid and alkali, it is dipped in the coagulant for 10 seconds, dried in a 70°C oven for 5 minutes, and the mold surface is dried. When the mold temperature drops to 35°C, it is transferred to a water-based polyurethane mixed glue pool for immersion for 10 seconds, dried in a 70°C oven for 5 minutes, transferred to a curling machine for curling, transferred to a 55°C leaching pool for leaching for 4 minutes, transferred to an oven for drying at 120°C for 50 minutes, and demolded after the film layer is completely dry. It is transferred to an outer isolation tank to dip in the anti-sticking agent for 10 seconds, transferred to an oven for baking at 100°C for 2 minutes, and transferred to a demolding machine for mechanical demolding to obtain a balloon product with a film thickness of 0.20mm.

[0017] Example 4 Step 1: Preparation of water-based polyurethane mixed glue: Take 90 parts of water-based polyurethane emulsion with a solid content of 30% (Huayue model: water-based polyurethane 1618), add 5 parts of water-based titanium dioxide paste, 0.5 parts of acetylene glycol wetting agent, 3 parts of EDTA-2Na chelating agent, and 0.5 parts of defoaming agent, stir the above materials evenly and set aside; Step 2: Preparation of coagulant: Mix 15 parts of aqueous wax emulsion release agent, 10 parts of calcium nitrate, 1 part of wetting agent, 0.5 parts of defoaming agent and 63.5 parts of deionized water until homogeneous; Step 3: Dipping molding process: After the glass round balloon mold is cleaned alternately with acid and alkali, it is dipped in the coagulant for 10 seconds, dried in a 70℃ oven for 4 minutes, and the mold surface is dried. When the mold temperature drops to 20℃, it is moved into a water-based polyurethane mixed glue pool and immersed for 10 seconds, dried in a 70℃ oven for 4 minutes, moved into a crimping machine for curling, moved into a 50℃ leaching pool for leaching for 3 minutes, moved into an oven for drying at 120℃ for 45 minutes, and demolded after the film layer is completely dry. Move it into an outer isolation tank to dip in the anti-sticking agent for 10 seconds, move it into an oven for baking at 100℃ for 1 minute, and move it into a demolding machine for mechanical demolding to obtain a balloon product with a wall thickness of 0.10mm.

[0018] The results of the aqueous polyurethane balloons of Examples 1 to 4 were shown in Table 1 with reference to the national standard GB / T528-2009.

[0019]

[0020] From the results in Table 1, it can be seen that the balloons made of waterborne polyurethane of the present invention have excellent comprehensive properties.

[0021] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit the same. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that they can still modify or replace the technical solutions of the present invention with equivalents, and these modifications or equivalent replacements cannot cause the modified technical solutions to deviate from the spirit and scope of the technical solutions of the present invention.

Claims

1. A method for preparing a waterborne polyurethane balloon is characterized in that: The preparation method comprises the following steps (1) The configuration of the adhesive raw materials is as follows: based on 100 parts of the adhesive raw materials, the aqueous polyurethane emulsion is 80-100 parts, the color paste is 0-10 parts, the defoamer is 0.02-0.08 parts, the wetting agent is 0.01-1 parts, and the chelating agent is 1-5 parts; (2) The coagulant solution is prepared by weight based on 100 parts of the coagulant mixed solution, which consists of 8-20 parts of a release agent, 8-25 parts of a flocculant, 0.02-2 parts of a wetting agent, 0.02-2 parts of a defoaming agent, and 50-86 parts of water; (3) Preparation by dipping process: cleaning mold → dipping in coagulant → drying → dipping in step 1 emulsion → drying → dipping in step 2 emulsion → drying → curling → leaching → drying → dipping in anti-sticking agent → drying → demoulding.

2. The composition according to claim 1, characterized in that Water-based polyurethane emulsion solid content 25-50%, temperature: 5-45 degrees.

3. The composition according to claim 1, wherein The wetting agent is a polyether-modified silicone, one of the acetylene glycol type.

4. The composition according to claim 1, characterized in that The chelating agent is one or a combination of sodium gluconate, amino acid chelating agent, and EDTA chelating agent.

5. The composition according to claim 1, characterized in that The release agent is one of diatomaceous earth type, aqueous stearate type, aqueous amide type, aqueous wax emulsion type, or a combination thereof.

6. The flocculant according to claim 1, which is one of calcium nitrate salt and calcium chloride salt.

7. The mold according to claim 1, characterized in that It is one of stainless steel, plastic, ceramic, and glass.

8. The mold temperature for dipping the emulsion in step 1 according to claim 1 is 15-45°C.

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