4071S9 A7 B7 五、發明説明（1) 本發明係有關於一種改質型水泥，特別是有關於一種 水性聚胺基甲酸酯改質之乳膠水泥組合物。 水泥爲一種高硬度材質，無法吸收各種物理變化所產 生之應力，會產生膨脹、孔隙及龜裂，因而若在其中添加 軟質材料，如各類乳膠，不但可吸收體積膨脹及應力並可 填補孔隙，達到防水效果。 乳膠爲樹脂以顆粒狀均勻分佈在水中所形成，顆粒粒 徑由數十次微米（μ)至數百次微米，樹脂所佔的重量百分比 爲10〜70，當水份揮發、成膜後，材質柔軟且富彈性、類 似橡膠。乳膠具有黏著作用，常應用於黏著劑，如紙板、 膠帶、不織物、塗料及磁磚等。 經濟部中央標準局員工消費合作社印製 *...... Γ —I! I - - I --1 - - - - -I I m 1^1 XV -'° (請先閲讀背面之注意事項再填寫本頁) 乳膠及水泥皆具有黏著功能，藉適當混合，而使其分 別發揮乳膠的柔軟以及水泥剛硬功能，具有優良的防水 性。常用於建築業之乳膠有壓克力乳膠、乙烯-醋酸乙烯乳 膠及苯乙烯-丁二烯橡膠乳膠等。壓克力乳膠一般由軟質鏈 及硬質鏈所組成，如乙烯己烯壓克力及甲基丙烯酸壓克 力，前者爲軟質材，類似彈性體，後者爲硬質材，類似玻 璃，軟質材的比例增加，防水功能會增加。部份乳膠含有 羧酸官能基，可提高其接著性，增加物理及化學安定性， 羧酸官能基含量若過高，會使材質具吸水性，不易乾燥。 乙烯-醋酸乙烯乳膠爲乙烯及醋酸乙烯所合成，前者爲 軟質材，後者爲硬質材，乙烯醋酸乙烯乳膠由於極性較高， 對許多基材皆具有良好的黏著效果。 苯乙烯_丁二烯橡膠乳膠由苯乙烯及丁二烯橡膠所合 本紙張尺度適用中國國家標準（CNS ) A4規格（210 X 297公釐） 經濟部中央標率局員工消費合作社印繁 407139 A7 B7 五、發明説明（2) 成，前者爲硬質材，類似玻璃，脆而硬，後者爲軟質，功 能形同橡膠，柔軟且富彈性。 水性聚胺基甲酸酯爲異氰酸鹽、多元醇及羧酸官能基 所合成。異氰酸鹽含量較多，材質較硬，多元醇比例較多， 材質柔軟，藉適當比例組合，可製得堅硬而強韌材質，另 外，藉分子量控制及親水基植入技術，可使材質具有親水 性0 乳膠水泥的製造方法係將乳膠與水泥以一定的比例摻 混，摻混方式爲容器中先加入乳膠，再以攪拌機將乳膠攪 拌，同時逐漸加入水泥，若有必要可在乳膠中加入助劑如 減水劑、消泡劑以提高乳膠水泥之加工性及表面平滑性。 水泥亦可先與適量的水先混合，再逐漸加入乳膠中，以增 加混合性。授拌機轉速一般爲50 rpm至300 ipm。當攬拌 均勻後，將混合物倒於離型紙上，並使其具有均勻厚度， 一般爲2〜3亳米，製成標準試片，供測試使用。在建築工 地則係在乳膠與水泥攪拌均勻後，倒於基材上，必要時以 工具如鏝刀塗抹，使其平坦，約2〜3天即產生硬化效果， 完全硬化則因水泥需28天養生才可完成。 乳膠水泥之開發，在國外已有十餘年歷史，在國内則 在最近數年才陸續開發使用。如中華民國專利16433號， 揭示一種製備多階段聚合物乳膠水泥改質劑之方法，係以 丁基壓克力樹脂與含羧酸官能基化合物合成壓克力乳膠， 壓克力樹脂比率爲13.3〜30%。 美國專利5176733號揭示一種水泥混合物組成，係以 ---------- 卜衣------ΪΤ (請先閱讀背面之注意事項再填寫本頁) 本紙張尺度適用中國國家標準（CNS ) A4規格（210X297公釐） 經濟部中央標準局員工消費合作社印製 407139 A7 B7五、發明説明（3) 壓克力共聚物改質水泥，壓克力共聚物之比率爲 13.3〜30%。 美國專利5192366號揭示一種水泥混合物，係以醋酸 乙烯乳膠改質水泥。 美國專利5308397號揭示一種建築物牆壁底塗，係以 苯乙烯-丁二烯橡膠改質水泥。 美國專利5310780號揭示聚胺基甲酸酯分散液所製備 之填缝料，應用於多孔材，如木頭、混凝土或水泥上，聚 胺基甲酸酯分散液並未與水泥混合使用，而係直接塗佈於 多孔材之表面上。 現請參閲第1圖，乳膠的構造爲乳膠顆粒分散於水 中，如第la圖所示，當水份逐漸揮發逸出時，乳膠顆粒逐 漸互相靠近，如第lb圖所示，當水份更少時，乳膠顆粒堆 積、變形、融合，如圖第lc圖所示。最後，乳膠變成薄膜， 如第Id圖所示。乳膠顆粒在堆積時，顆粒與顆粒間僅靠物 理性作用而結合。 當上述材料應用於乳膠水泥時，會在水泥孔隙間連結 成不規則線型，形成不規則結構，第2圖所示。 習知之乳膠水泥，由於所使用之乳膠中或分散液，其 分子與分子間僅靠物理作用結合，因而以這些材料所改質 之水泥，其抗拉強度及伸長率皆不大。 本發明之目的乃是要提供一種具有較高之抗拉強度及 伸長率之改質水泥組合物。 本發明之改質水泥組合物乃採用水性聚胺基甲酸酯分 _n - - 0t lil n ^^1 - (Hr ----- I ill n^i ---------- "T 口 (請先閱讀背面之注意事項再填寫本頁) 本紙張尺度適用中國國家標準（CNS ) A4規格（210'〆297公釐） 407139 A7 經濟部中央標準局員工消費合作社印製 B7五、發明説明（4 ) 散液爲乳膠材料並添加適當之交聯劑以使乳膠顆粒在堆積 時會因材質中可參與化學反應之羧酸官能基與交聯劑產生 交聯反應而產生化學鍵結，其強度較傳統之乳膠水泥爲 高，伸長率亦較佳。 詳而言之，本發明之改質水泥組合物包括： a) 水性聚胺基甲酸酯分散液， b) 交聯劑，以及 c) 水泥，其中水性聚胺基甲酸酯分散液中聚胺基甲酸 酯相對於水泥之用量爲1.3/1.0〜1.0/1.0 ;而交聯劑相對於 水泥之用量爲1/100至3/100。 本發明之改質水泥組合物之製法乃是先將水性聚胺基 甲酸酯分散液與適當之交聯劑攪拌混合成混合物。另外再 將水泥與水混合，如需要可加入減水劑減少水之用量以使 水泥在成型時可在較短時間乾燥且可幫助攪拌均勻。適用 於本發明之減水劑包括苯磺酸鹽類、三聚氰胺-甲醛鹽類、 羧酸氫氧鹽類、低分子量、硼酸鹽類、磷酸鹽類等。亦可 加入界面活性劑減少氣泡。混合均勻後，倒入水性聚胺基 甲酸酯之分散液中再混合均勻即可。 以下藉由圖式及實施例詳細説明本發明。 圖式之簡單説明 第1圖係顯示一般乳膠之成膜過程之示意圖， 第2圖係説明乳膠水泥構造之形成過程之微觀示意 圖， 第3圖係説明水性聚胺基甲酸酯分散液之成膜過程之 (請先閱讀背面之注意事項再填寫本頁) 本紙張尺度適用中國國家標準（CNS ) A4規格（210X297公釐） 407139 A7 B7 五、發明説明（5) 示意圖。 本發明所用之乳膠爲可交聯之水性聚胺基甲酸酯之分 散液，其特性可藉由調整異氰酸酯及多元醇之比例及交聯 劑用量來調整，而且具有污染少、符合環保之優點。 而本發明所用之交聯劑只要可使水性聚胺基甲酸酯交 聯者即可，並無特別限制適用於本發明之交聯劑包括聚碳 化二亞胺、聚異氰酸鹽、水性環氧樹脂、三聚氰胺甲醛樹 脂、一氮雜丙烯、鋅鹽、锆鹽暨其錯合物等。較佳者爲具 有N=ON官能基之聚碳化二亞胺。 請參閲第3圖，本發明之聚胺基甲酸酯乳膠粒分散於 水中（第3a圖）之後，水份會參與水泥之水和反應使乳膠粒 互相靠近（第3b圖）之後乳膠粒堆積、變形、融合而成膜（第 3c圖及第3d圖）。但是由於本發明之聚胺基甲酸酯中具有 可參與化學反應之羧酸官能基，其會與例如聚碳化二亞胺 交聯劑產生如下之交聯反應： ---------^-I 笨------ΐτ (請先閲讀背面之注意事項再填寫本頁) 經濟部中央標準局員工消費合作社印製 C C - OH 十4071S9 A7 B7 V. Description of the invention (1) The present invention relates to a modified cement, in particular to a water-based polyurethane modified latex cement composition. Cement is a high-hardness material, which cannot absorb the stress caused by various physical changes, and will cause expansion, porosity and cracks. Therefore, if soft materials such as various types of latex are added to it, not only can it absorb volume expansion and stress and can fill the pores To achieve waterproof effect. Latex is formed by resin uniformly distributed in water in the form of particles. The particle size ranges from tens of micrometers (μ) to hundreds of micrometers. The weight percentage of the resin is 10 ~ 70. When the water evaporates and forms a film, The material is soft and flexible, similar to rubber. Latex has an adhesive effect and is often used in adhesives such as cardboard, tape, non-woven fabrics, coatings and tiles. Printed by the Consumer Cooperatives of the Central Bureau of Standards of the Ministry of Economic Affairs * ...... Γ —I! I--I --1-----II m 1 ^ 1 XV-'° (Please read the notes on the back first (Fill in this page again) Both latex and cement have adhesive functions. By proper mixing, they can make the latex soft and cement rigid, respectively, and have excellent water resistance. The latexes commonly used in the construction industry include acrylic latex, ethylene-vinyl acetate latex, and styrene-butadiene rubber latex. Acrylic latex is generally composed of soft and hard chains, such as vinyl hexene acrylic and methacrylic acrylic. The former is a soft material, similar to an elastomer, and the latter is a hard material, similar to glass, and the ratio of soft materials. Increase, the waterproof function will increase. Part of the latex contains carboxylic acid functional groups, which can improve its adhesion and increase physical and chemical stability. If the content of carboxylic acid functional groups is too high, the material will be water-absorbent and difficult to dry. Ethylene-vinyl acetate latex is synthesized from ethylene and vinyl acetate. The former is a soft material and the latter is a hard material. Because of its high polarity, ethylene vinyl acetate latex has good adhesion to many substrates. Styrene_Butadiene rubber latex Composed of styrene and butadiene rubber. The paper size is applicable to Chinese National Standard (CNS) A4 (210 X 297 mm). Central Standards Bureau, Ministry of Economic Affairs, Consumer Consumption Cooperative, India 407139 A7 B7 V. Description of the invention (2) The former is a hard material, similar to glass, brittle and hard, while the latter is soft, functions like rubber, and is soft and elastic. Aqueous polyurethanes are synthesized from isocyanate, polyol, and carboxylic acid functional groups. Isocyanate content is more, the material is harder, the polyol ratio is more, and the material is soft. By combining the appropriate ratio, a hard and tough material can be made. In addition, the molecular weight control and hydrophilic base implantation technology can make the material Hydrophilic latex cement is manufactured by mixing latex and cement in a certain ratio. The mixing method is to add latex to the container first, then stir the latex with a mixer, and gradually add the cement, if necessary, in the latex. Add additives such as water reducer and defoamer to improve the workability and surface smoothness of latex cement. Cement can also be mixed with an appropriate amount of water first, and then gradually added to the latex to increase the miscibility. The blender speed is typically 50 rpm to 300 ipm. When the mixture is uniform, pour the mixture on the release paper and make it have a uniform thickness, usually 2 ~ 3mm. Make a standard test piece for testing. At the construction site, after the latex and cement are evenly mixed, pour it on the substrate, and if necessary, apply a tool such as a trowel to make it flat. A hardening effect will occur in about 2 to 3 days, and it will take 28 days for the full hardening to occur. Wellness can be completed. The development of latex cement has a history of more than ten years in foreign countries, and it has only been developed and used in recent years in China. For example, the Republic of China Patent No. 16433 discloses a method for preparing a multi-stage polymer latex cement modifier, which is an acrylic latex synthesized by using a butyl acrylic resin and a compound containing a carboxylic acid functional group, and the acrylic resin ratio is 13.3 ~ 30%. U.S. Patent No. 5176733 discloses the composition of a cement mixture, which is based on -------- Pu Yi (Please read the precautions on the back before filling this page) This paper size is applicable to China Standard (CNS) A4 specification (210X297 mm) Printed by the Consumer Cooperative of the Central Standards Bureau of the Ministry of Economic Affairs 407139 A7 B7 V. Description of the invention (3) Modified acrylic copolymer cement, the ratio of acrylic copolymer is 13.3 ~ 30%. U.S. Patent No. 5,192,366 discloses a cement mixture modified with vinyl acetate latex. U.S. Patent No. 5,308,397 discloses a primer for building walls, modified with styrene-butadiene rubber. U.S. Patent No. 5,310,780 discloses that the joint filler prepared by the polyurethane dispersion is applied to porous materials such as wood, concrete or cement. The polyurethane dispersion is not mixed with cement, but is Apply directly on the surface of the porous material. Now refer to Figure 1. The structure of the latex is that the latex particles are dispersed in water. As shown in Figure la, when the water gradually evaporates and escapes, the latex particles gradually approach each other, as shown in Figure lb. When less, the latex particles pile up, deform, and fuse, as shown in Figure lc. Finally, the latex becomes a film, as shown in Figure Id. When the latex particles are stacked, the particles and the particles are combined only by physical action. When the above materials are applied to latex cement, they will form irregular lines between the cement pores, forming an irregular structure, as shown in Figure 2. The conventional latex cement, because of the latex used in the latex or the dispersion, its molecules and molecules are bound only by physical interaction, so the cement modified by these materials has low tensile strength and elongation. The object of the present invention is to provide a modified cement composition with higher tensile strength and elongation. The modified cement composition of the present invention uses water-based polyurethane fraction _n--0t lil n ^^ 1-(Hr ----- I ill n ^ i --------- -T-port (please read the precautions on the back before filling this page) This paper size applies to China National Standard (CNS) A4 (210'〆297 mm) 407139 A7 B7 V. Description of the invention (4) The liquid dispersion is a latex material and an appropriate cross-linking agent is added so that when the latex particles are stacked, the carboxylic acid functional group in the material that can participate in the chemical reaction and the cross-linking agent are generated by the cross-linking reaction. It is chemically bonded, its strength is higher than that of traditional latex cement, and its elongation is better. In detail, the modified cement composition of the present invention includes: a) an aqueous polyurethane dispersion, b) cross-linking Agent, and c) cement, wherein the amount of polyurethane relative to cement in the aqueous polyurethane dispersion is 1.3 / 1.0 to 1.0 / 1.0; and the amount of crosslinking agent relative to cement is 1 / 100 to 3/100. The modified cement composition of the present invention is prepared by first mixing an aqueous polyurethane dispersion with an appropriate crosslinking agent to form a mixture. In addition, the cement is mixed with water. If necessary, a water reducing agent can be added to reduce the amount of water so that the cement can be dried in a short time during the molding process and can help to stir uniformly. Water reducing agents suitable for use in the present invention include benzenesulfonates, melamine-formaldehyde salts, carboxylic acid hydroxides, low molecular weight, borate, phosphate, and the like. Surfactants can also be added to reduce air bubbles. After mixing well, it can be poured into the dispersion of aqueous polyurethane and mixed evenly. The invention is described in detail below with reference to the drawings and examples. Brief description of the drawings. Figure 1 is a schematic diagram showing the film formation process of general latex, Figure 2 is a microscopic diagram illustrating the formation process of latex cement structure, and Figure 3 is a diagram illustrating the formation of an aqueous polyurethane dispersion. Film process (Please read the precautions on the back before filling this page) This paper size is applicable to China National Standard (CNS) A4 specification (210X297 mm) 407139 A7 B7 V. Description of the invention (5) Schematic diagram. The latex used in the present invention is a crosslinkable aqueous polyurethane dispersion. Its characteristics can be adjusted by adjusting the ratio of isocyanate and polyol and the amount of crosslinking agent, and it has the advantages of less pollution and environmental protection. . The cross-linking agent used in the present invention is not limited as long as it can crosslink the aqueous polyurethane, and the cross-linking agent suitable for the present invention includes polycarbodiimide, polyisocyanate, water-based Epoxy resin, melamine formaldehyde resin, monoazapropene, zinc salt, zirconium salt and its complex. Preferred is a polycarbodiimide having an N = ON functional group. Please refer to Figure 3. After the polyurethane latex particles of the present invention are dispersed in water (Figure 3a), water will participate in the water of the cement and react to bring the latex particles close to each other (Figure 3b). Stack, deform, and fuse to form a film (Figures 3c and 3d). However, since the polyurethane of the present invention has a carboxylic acid functional group that can participate in a chemical reaction, it will produce the following crosslinking reaction with, for example, a polycarbodiimide crosslinking agent: -------- -^-I Stupid ------ ΐτ (Please read the notes on the back before filling out this page) Printed by CC-OH of the Consumer Cooperatives of the Central Standards Bureau of the Ministry of Economic Affairs
N ! I I ! C '; N ΟN! I I! C '; N Ο
R + HO C—— N Ιί C ii NR + HO C—— N Ιί C ii N
R I N - H 〇 Lo!i -C - N I I R O I N - C !! 〇 = C H - N 聚胺基甲酸酯聚碳化二亞胺聚胺基甲酸酯交聯網狀結構 本紙張尺度適用中國國家標準（CNS ) Α4規格（210Χ297公釐） 407139 A7 B7 五、發明説明（6 ) 水性聚胺基甲酸酯之顆粒間可藉此反應，形成網狀結 構（第3C圖）’且由於水性聚胺基甲酸酯之材質具有高伸長 率之優點，因而所改質之水泥有網狀構造，具有高強度、 高伸長率之優點。 實施例1 將水性聚胺基甲酸酿（美國拜耳公司產品，5〇xjd，固 含量45%)分散液130公克加入聚碳化二亞胺交聯朝（美國 永備公司，型號29SE)1公克，以攪拌機攪拌，轉速300rpin ，時間3分鐘。水泥（台灣水泥公司，第I型水泥）ι〇〇公克 加入水50公克及減水劑（昱昇公司產品，型號AB-DIS)， 混合均勻後，逐漸倒至水性聚胺基甲酸酯分散液中，同時 以攪拌機攪拌，轉速及時間同前，再將其倒於離型紙上， 並使其分佈均勻，靜置成型。 實施例2 經濟部中央標準局員工消费合作社印簟 m. I 1 -- - - - - - n '衣---- - an 1 _!= (請先聞讀背面之注意事項再填寫本頁) 將水性聚胺基甲酸酯（美國拜耳公司產品，50UD，固 含量45%)分散液130公克加入聚碳化二亞胺交聯劑（美國 永備公司，型號29SE)3公克，以攪拌機攪拌，轉速300rPm， 時間3分鐘。水泥（台灣水泥公司，第I型水泥）1〇〇公克加 入去離子水60公克，混合均勻後，逐漸倒至水性聚胺基甲 酸酯分散液中，同時以攪拌機攪拌，轉速及時間同前，再 將其倒於離型紙上，並使其分佈均勻，靜置成型。 實施例3 將水性聚胺基甲酸酯（美國拜耳公司產品，5〇UD，固 含量45%)分散液13〇公克加入聚碳化二亞胺交聯劑（美國 本紙张尺度適用中國國家標準（CNS ) A4規格（210X297公釐） 407139 A7 B7 五、發明説明（7 ) 永備公司，型號29SE)3公克，以攪拌機攪拌，轉速300rpm， 時間3分鐘。水泥（台灣水泥公司，第I型水泥）100公克加 入去離子水60公克及減水劑（員和公司產品，型號L-10)3 公克，混合均勻後，逐漸倒至水性聚胺基甲酸酯分散液中， 同時以攪拌機攪拌，轉速及時間同前，再將其倒於離型紙 上，並使其分佈均勻，靜置成型。 實施例4 將水性聚胺基甲酸酯（工研院化工所開發之產品，固含 量40%)分散液100公克加入聚碳化二亞胺交聯劑（美國永 備公司產品，型號29SE)1公克，以攪拌機攪拌，轉速 300rpm，時間3分鐘。水泥（台灣水泥公司，第I型水泥）100 公克加水60公克及減水劑（員和公司產品，型號L-10)3公 克，混合均勻後，逐漸倒至水性聚胺基甲酸酯分散液中， 同時以攪拌機攪拌，轉速及時間同前，再將其倒於離型紙 上，並使其分佈均勻，靜置成型。 比較例1 經濟部中央標準局員工消費合作社印製 (請先閲讀背面之注意事項再填寫本頁) 將壓克力乳膠分散液（長興化工公司產品，型號 ETERSOL 691)100公克及水泥100公克（台泥公司第I型水 泥），以攪拌機攪拌，轉速300rpm，時間3分鐘，再將之 倒在離型紙上使其分佈均勻，靜置成型。 上述實施例1_4之本發明之改質水泥組合物與比較例 1之改質水泥之試片，測試其抗拉強度，伸長率及防水性 結果如表1。 本紙張尺度適用中國國家標準（CNS ) A4規格（210X297公釐） 407139 五、發明説明（8 ) A7 B7 妙麟ISSS-鄉槪 。交糊 表1 mm h ujm. F 雜：克 伸艮率Μ防树姑Η'時 卿 11 - 100 - - 100 D 18 可 雜U 130 100 30 1 3 _ 80 60 可 瓣J2 130 100 ω 3 - - ω 55 可 瓣J3 100 100 60 3 3 - 40 40 可 100 100 50 1 3 - 40 25 可 註：（1)抗拉強度及伸長率之測試方法係按照CNS 6988 標準規範 (2)防水性測試方法係按照CNS 4684標準規範 由表1可知本發明之改質水泥具有較佳之抗拉強度及 伸長率。 -* —i - - - I —衣--11---- I n ......... In (請先閱讀背面之注意事項再填寫本頁) 經濟部中央標準局員工消費合作社印製 本紙張尺度適用中國國家標準（CNS ) A4規格（210X297公釐）RIN-H 〇Lo! I -C-NIIROIN-C !! 〇 = CH-N Polyurethane polycarbodiimide polyurethane cross-linked network structure This paper applies Chinese national standards (CNS) ) A4 specification (210 × 297 mm) 407139 A7 B7 V. Description of the invention (6) The particles of the water-based polyurethane can react to form a network structure (Figure 3C). The material of the acid ester has the advantage of high elongation, so the modified cement has a network structure and has the advantages of high strength and high elongation. Example 1 130 grams of a dispersion of an aqueous polyurethane (Bayer, 50xjd, 45% solids) was added to 1 gram of polycarbodiimide crosslinker (U.S. Everbright Company, model 29SE) Stir with a blender at a speed of 300rpin for 3 minutes. Cement (Taiwan Cement Company, Type I Cement): 500,000 grams of water and 50 grams of water and water reducing agent (product of Yusheng Company, model AB-DIS), after mixing well, gradually poured into water-based polyurethane dispersion At the same time, use a blender to stir at the same speed and time as before, then pour it on the release paper, make it evenly distributed, and let it stand. Example 2 Seal of the Consumer Cooperative of the Central Standards Bureau of the Ministry of Economic Affairs m. I 1------n 'yi -----an 1 _! = (Please read the precautions on the back before filling out this page ) Add 130 grams of aqueous polyurethane (Bayer, 50UD, 45% solids) dispersion to 3 grams of polycarbodiimide cross-linking agent (Yongbei Company, Model 29SE) and stir with a mixer , Speed 300rPm, time 3 minutes. Add 100 grams of cement (Taiwan Cement Company, Type I cement) to 60 grams of deionized water, mix well, and then gradually pour it into the aqueous polyurethane dispersion. Stir with a mixer at the same speed and time. Then, pour it on the release paper, make it evenly distributed, and let it stand. Example 3 13 grams of an aqueous polyurethane (Bayer product, 50UD, 45% solids content) dispersion was added to a polycarbodiimide cross-linking agent (the paper standard in the United States applies Chinese national standards ( CNS) A4 specification (210X297 mm) 407139 A7 B7 V. Description of the invention (7) Yong Bei Company, model 29SE) 3 grams, stirring with a mixer, speed 300 rpm, time 3 minutes. Add 100 grams of cement (Taiwan Cement Company, Type I cement) to 60 grams of deionized water and 3 grams of water reducing agent (Yanwa Company's product, model L-10). After mixing well, gradually pour to water-based polyurethane. In the dispersion, agitate at the same time with a stirrer at the same speed and time as before, then pour it on the release paper, make it evenly distributed and let it stand. Example 4 100 grams of a dispersion of an aqueous polyurethane (product developed by the Institute of Chemical Industry and Engineering, solid content 40%) was added to a polycarbodiimide cross-linking agent (product of US Yongbei Company, model 29SE) 1 Grams, stir with a stirrer, rotate at 300 rpm for 3 minutes. Cement (Taiwan Cement Company, Type I Cement) 100 grams of water plus 60 grams of water and 3 grams of water reducing agent (Henwa company product, model L-10), after mixing, gradually poured into the aqueous polyurethane dispersion At the same time, use a mixer to stir, the speed and time are the same as before, then pour it on the release paper, make it evenly distributed, and let it stand. Comparative Example 1 Printed by the Consumer Cooperative of the Central Bureau of Standards of the Ministry of Economic Affairs (please read the precautions on the back before filling this page) 100 grams of acrylic latex dispersion (product of Changxing Chemical Company, model ETERSOL 691) and 100 grams of cement ( Type I cement of Taini Company), using a mixer, rotating at 300 rpm for 3 minutes, and then pouring it on release paper to make it evenly distributed and let it stand. The test pieces of the modified cement composition of the present invention in Examples 1 to 4 and the modified cement of Comparative Example 1 were tested for tensile strength, elongation, and water resistance. Table 1 shows the results. This paper size applies to China National Standard (CNS) A4 specification (210X297 mm) 407139 V. Description of invention (8) A7 B7 Miaolin ISSS-Township. Crossover table 1 mm h ujm. F Miscellaneous: Ke Yangen rate M anti-tree aunt 'Shi Qing 11-100--100 D 18 Miscellaneous U 130 100 30 1 3 _ 80 60 Flap J2 130 100 ω 3-- ω 55 flap J3 100 100 60 3 3-40 40 may 100 100 50 1 3-40 25 Note: (1) The test method for tensile strength and elongation is in accordance with CNS 6988 standard specification (2) Water resistance test method It is known from Table 1 according to the CNS 4684 standard specification that the modified cement of the present invention has better tensile strength and elongation. -* —I---I — 衣 --11 ---- I n ......... In (Please read the notes on the back before filling out this page) Staff Consumer Cooperatives of the Central Standards Bureau of the Ministry of Economic Affairs The printed paper size is applicable to China National Standard (CNS) A4 (210X297 mm)