Modified RTPU floor

Abstract

The invention discloses a modified RTPU (Resin Transfer Polyurethane) floor, and relates to the technical field of floor modification. 0.5 to 3 parts of an antioxidant; 5 to 10 parts of a toughening agent; 300 to 400 parts of filler; 0.5 to 2 parts of a lubricant; the antioxidant is prepared from a compound system of a hindered phenol antioxidant and a phosphite ester antioxidant, the hindered phenol antioxidant is a main antioxidant, the phosphite ester antioxidant is an auxiliary antioxidant, the main antioxidant is firstly added during compounding, then the auxiliary antioxidant is added, and the hindered phenol antioxidant and the phosphite ester antioxidant are compounded. The oxidation resistance of the manufactured RTPU floor is remarkably improved, the toughness is greatly improved, the comprehensive performance is excellent, and the preparation method is simple.

Description

Technical Field

[0001] The present invention relates to the technical field of floor modification, and particularly to a modified RTPU floor. Background Art

[0002] Thermoplastic polyurethane (RTPU) has excellent wear resistance, chemical corrosion resistance, high elasticity and other characteristics, and has gradually been applied in the floor field. However, ordinary RTPU floors have some deficiencies. For example, they are prone to aging due to oxidation during long-term use, resulting in performance degradation; their toughness is limited, and they are prone to cracking and other problems when subjected to impact, which limits their wider application. At present, the RTPU floors on the market are difficult to achieve an ideal balance in terms of antioxidant performance and toughness improvement, and cannot well meet the growing needs of consumers for the durability and stability of floors. Summary of the Invention

[0003] Object of the Invention: The technical problem to be solved by the present invention is to provide a modified RTPU floor, which solves the problem that the RTPU floor cannot achieve a balance in antioxidant performance and toughness improvement.

[0004] Technical Solution

[0005] To solve the above problems, the technical solution provided by the present invention is as follows:

[0006] A modified RTPU floor, comprising: 80 - 100 parts of RTPU resin; 0.5 - 3 parts of antioxidant; 5 - 10 parts of toughening agent; 300 - 400 parts of filler; 0.5 - 2 parts of lubricant.

[0007] Further, the antioxidant is a compound system made of a hindered phenol antioxidant and a phosphite antioxidant. The hindered phenol antioxidant is the main antioxidant, and the phosphite antioxidant is the auxiliary antioxidant. When compounding, the main antioxidant is added first, and then the auxiliary antioxidant is added.

[0008] Further, the hindered phenol antioxidant is pentaerythritol tetrakis [β - (3,5 - di - tert - butyl - 4 - hydroxyphenyl) propionate].

[0009] Further, the hindered phenol antioxidant is hindered phenol antioxidant 1010.

[0010] Further, the phosphite is tris(2,4 - di - tert - butylphenyl) phosphite.

[0011] Further, the phosphite is phosphite antioxidant 168.

[0012] Further, the ratio of the hindered phenol antioxidant to the phosphite antioxidant is 1:(0.5 - 2), and the total content of the antioxidant accounts for 0.3% - 0.8% of the modified RTPU floor.

[0013] Further, the toughening agent is ethylene - octene copolymer grafted maleic anhydride.

[0014] Further, the filler is heavy calcium carbonate, the heavy calcium carbonate is surface - treated with stearic acid, and the lubricant is zinc stearate.

[0015] A production method of a modified RTPU floor. It is used to produce the above - mentioned modified RTPU floor, including raw material pretreatment, batching and mixing, melt blending, extrusion molding, film laminating and tempering, and slicing and edge trimming; a twin - screw extruder is used in the melt - blending process, and the temperature of the twin - screw extruder is set as follows: from the feeding section to the die head, it is 160 - 170°C, 170 - 180°C, 180 - 190°C, 190 - 200°C, 200 - 210°C in sequence, and the screw speed is 200 - 300 r / min. Beneficial effects

[0016] Adopting the technical solution provided by the present invention, compared with the prior art, it has the following beneficial effects:

[0017] The RTPU floor produced by the technical solution provided by the present invention has significantly improved antioxidant performance, greatly enhanced toughness, excellent comprehensive performance, and a simple preparation method.

[0018] Significantly improved antioxidant performance: The present invention adopts a compound system of hindered phenol antioxidants and phosphite antioxidants. The two act synergistically to effectively capture free radicals and decompose hydroperoxides, which can significantly delay the oxidative aging of the RTPU floor and improve its service life. Through the hot - air aging test, after the RTPU floor modified by the present invention is aged at 120°C for 72 hours, the tensile strength retention rate reaches more than 85%, while the tensile strength retention rate of the RTPU floor without adding antioxidants is only about 60%.

[0019] Greatly enhanced toughness: Ethylene - octene copolymer grafted maleic anhydride (POE - g - MAH) is used as a toughening agent, which has good compatibility with the RTPU resin, can form a uniformly dispersed rubber phase in the RTPU matrix, effectively absorb impact energy, and improve the toughness of the floor.

[0020] Excellent comprehensive performance: While improving the antioxidant performance and toughness, the present invention ensures the dimensional stability, rigidity and processing performance of the RTPU floor by adding surface-treated heavy calcium carbonate and lubricants. The heavy calcium carbonate is evenly dispersed in the matrix, enhancing the rigidity of the floor, and the stearic acid treatment improves its interfacial bonding force with the matrix; the lubricant makes the processing process smoother and the surface quality of the product is good.

[0021] Simple preparation method: The preparation method of the present invention has a short process route, requires conventional equipment, and the parameters of each step are easy to control, which is suitable for large-scale industrial production, conducive to reducing production costs and improving the market competitiveness of products. Description of the drawings

[0022] Figure 1 It is a schematic process flow diagram of Example 1 of the present invention. Detailed implementation manners

[0023] To make the technical solutions of the present invention clearer, the present invention will be further described in detail below with reference to the drawings and specific embodiments.

[0024] Example 1

[0025] Combined with the attached Figure 1 , a modified RTPU floor for enhancing the antioxidant performance and toughness of the existing RTPU floor, and its specific formulation ratio is: RTPU resin: 80 - 100 parts; antioxidant: 0.5 - 3 parts; toughening agent: 5 - 10 parts; filler: 300 - 400 parts; lubricant: 0.5 - 2 parts.

[0026] The RTPU resin, that is, 80 - 100 parts of thermoplastic polyurethane, is the matrix material for making the floor and can provide basic mechanical properties and elasticity.

[0027] Antioxidant: 0.5 - 3 parts, made of a compound system of hindered phenol antioxidants and phosphite antioxidants. Among them, the hindered phenol antioxidant is selected as pentaerythritol tetra[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate], which has high antioxidant ability, can effectively capture free radicals and delay the oxidation of materials; the phosphite antioxidant is selected as tris(2,4-di-tert-butylphenyl)phosphite, which can decompose hydroperoxides and produce a synergistic effect with the hindered phenol antioxidant to enhance the antioxidant effect.

[0028] Toughening agent: 5 - 10 parts, which is ethylene - octene copolymer (POE) grafted maleic anhydride (POE - g - MAH). The ethylene - octene copolymer is POE. POE has good flexibility and impact toughness. After grafting maleic anhydride, it can form good interfacial compatibility with RTPU resin, effectively improve the toughness of RTPU, and does not affect other properties of the RTPU floor.

[0029] Filler: 300 - 400 parts, which is heavy calcium carbonate and is surface - treated with stearic acid. The treated heavy calcium carbonate can be evenly dispersed in the RTPU matrix, improve the dimensional stability and rigidity of the floor, and reduce costs at the same time.

[0030] Lubricant: 0.5 - 2 parts, which is zinc stearate. It plays a lubricating role during processing, reduces the friction between the material and the processing equipment, improves the processing performance, and makes the surface of the product smooth.

[0031] Among them, the compound system of antioxidants is specifically:

[0032] The preferred brand of phenolic antioxidant is phenolic antioxidant 1010, which has the advantages of high molecular weight and high temperature resistance;

[0033] The preferred brand of phosphite antioxidant is phosphite antioxidant 168, which can produce a synergistic effect when used in combination with phenolic antioxidant 1010.

[0034] The compounding process is: phenolic antioxidant 1010 is the main antioxidant, reacting with free radicals R· or ROO·, and phosphite antioxidant 168 is the auxiliary antioxidant.

[0035] Decompose the hydroperoxide that still has certain activity generated by the main antioxidant, and adjust the compounding ratio according to the required physical properties. The specific ratio is: the ratio of phenolic antioxidant 1010 to phosphite antioxidant 168 is 1:(0.5 - 2).

[0036] The dosage is preferably 0.3% - 0.8%, that is, the total content of the antioxidant accounts for 0.3% - 0.8% of the total content of the floor material. During processing, the main antioxidant needs to be added first, and then the auxiliary antioxidant is added to avoid uneven dispersion during processing.

[0037] The specific process flow for making the modified RTPU floor through the above formula is:

[0038] Raw material pretreatment:

[0039] Dry the RTPU resin at 80 - 100 °C for 4 - 6 hours to remove moisture, thereby improving its performance and preventing bubbles and defects in the subsequent floor.

[0040] Dry the heavy calcium carbonate surface-treated with stearic acid at 100 - 120°C for 2 - 3 hours.

[0041] Ingredient mixing:

[0042] Weigh the dried RTPU resin, antioxidant, toughening agent, dried heavy calcium carbonate, and lubricant according to the above weight portions, add them to a high-speed mixer, and stir at a speed of 1000 - 1500 r / min for 10 - 15 minutes to fully mix and homogenize all raw materials.

[0043] Melting and blending:

[0044] Add the mixed materials to a twin-screw extruder for melting and blending.

[0045] The twin-screw extruder has five temperature zones, namely the feeding section, melting section, kneading section, exhaust section, and homogenization section, and can extrude the uniformly mixed materials into stable floor raw materials for finished products.

[0046] The temperature of the twin-screw extruder is set as follows: from the feeding section to the head, they are 160 - 170°C, 170 - 180°C, 180 - 190°C, 190 - 200°C, 200 - 210°C in sequence, and the screw speed is 200 - 300 r / min.

[0047] The blended materials are extruded into strips through the head of the extruder, and then cut into pellets by a water-cooled strand pelletizer.

[0048] Extrusion molding:

[0049] Put the pellets made in the previous process into the extruder and extrude them through the head to a five-roll or seven-roll thickness setting, and apply a film.

[0050] The thickness of the product extruded by the sizing roller can be adjusted according to the design requirements.

[0051] Film coating and tempering: Pass the extruded base material through the film coating line and the tempering line to determine its gloss and reduce shrinkage, warping, and stabilize the performance of the board.

[0052] Slicing and edge trimming: Slice and trim it according to the required size to make the board smooth and flat to obtain the finished product.

[0053] Comparative experiment:

[0054] Through the above manufacturing process of the modified RTPU floor, make modified RTPU floors with different material ratios, conduct experiments on the made modified RTPU floors, record the experimental results and make comparisons.

[0055] Experiment 1 (standard group): RTPU resin: 90 kg. Antioxidant: 1010: 1 kg, 168: 1.5 kg. Toughness agent: 12 kg.

[0056] Calcium carbonate: 300 kg. Zinc stearate: 1 kg.

[0057] Experiment 2 (antioxidant-free group): RTPU resin: 90 kg. Toughness agent: 12 kg. Calcium carbonate: 300 kg. Zinc stearate: 1 kg.

[0058] Experiment 3 (toughness-agent-free group): RTPU resin: 90 kg. Antioxidant: 1010: 1 kg, 168: 1.5 kg. Calcium carbonate: 300 kg. Zinc stearate: 1 kg.

[0059] The experimental results are as follows in the table:

[0060] Number Tensile strength (MPa) Elongation at break (%) Retention rate of tensile strength after hot air aging (%) Result of falling ball impact 1 (standard group) 22 480 88 No cracking 2 (group without antioxidant) 21.8 470 62 No cracking 3 (group without toughening agent) 21.5 420 87 Cracking

[0061] Experimental results:

[0062] From the above experimental result table, it can be concluded that although the RTPU floor without antioxidant has good flexibility and elasticity, after hot air aging, the retention rate of its tensile strength drops significantly. Therefore, its flexibility and elasticity will be significantly affected by hot air. While the RTPU floor without toughness agent is less affected by hot air, its own flexibility and elasticity are not good and it is prone to cracking.

[0063] The above-described embodiments only represent several implementation manners of the present invention. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the present invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several deformations and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention patent should be subject to the appended claims.

Claims

1. A modified RTPU floor, characterized in that: Including RTPU resin: 80 - 100 parts; antioxidant: 0.5 - 3 parts; toughening agent: 5 - 10 parts; Filler: 300 - 400 parts; Lubricant: 0.5 - 2 parts.

2. A modified RTPU floor according to claim 1, characterized in that: The antioxidant is prepared from a compound system of a hindered phenol antioxidant and a phosphite antioxidant, wherein the hindered phenol antioxidant is a main antioxidant and the phosphite antioxidant is an auxiliary antioxidant. During compounding, the main antioxidant is added first and then the auxiliary antioxidant.

3. A modified RTPU floor according to claim 2, characterized in that: The hindered phenol antioxidant is pentaerythritol tetrakis[β-(3,5-di-tert-butyl-4-hydroxyphenyl)propionate].

4. The modified RTPU floor according to claim 2, characterized in that: The hindered phenol antioxidant is hindered phenol antioxidant 1010.

5. The modified RTPU floor according to claim 2, characterized in that: The phosphite is tris(2,4-di-tert-butylphenyl)phosphite.

6. The modified RTPU floor according to claim 2, characterized in that: The phosphite is phosphite antioxidant 168.

7. The modified RTPU floor according to claim 1, characterized in that: The ratio of the hindered phenol antioxidant to the phosphite antioxidant is 1:(0.5-2), and the total content of the antioxidant accounts for 0.3%-0.8% of the RTPU floor.

8. The modified RTPU floor according to claim 1, characterized in that: The toughening agent is ethylene-octene copolymer grafted with maleic anhydride.

9. The modified RTPU floor according to claim 1, characterized in that: The filler is heavy calcium carbonate, the heavy calcium carbonate is surface treated with stearic acid, and the lubricant is zinc stearate.

10. A method for producing a modified RTPU floor, for producing the modified RTPU floor of any of claims 1 to 9, characterized in that: Raw material pretreatment, ingredient mixing, melt blending, extrusion molding, coating and tempering, slice cutting and edge chopping; a twin-screw extruder is used in the melt blending process, and the temperature of the twin-screw extruder is set as follows: 160-170°C, 170-180°C, 180-190°C, 190-200°C, 200-210°C from the feeding section to the die, and the screw speed is 200-300r / min.

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